CN102742184A - Optical fiber link detection method, optical line terminal and passive optical network system - Google Patents

Abstract

An embodiment of the invention relates to an optical fiber link detection method, an optical line terminal and a passive optical network system. The optical line terminal comprises at least one transceiver and a detection apparatus, wherein the transceiver is used for sending a first test optical signal to a data channel to be detected, wherein the data channel to be detected is any data channel between the optical line terminal and an optical network unit; the detection apparatus is used for receiving a second test optical signal returned after the first test optical signal is transmitted by the data channel to be detected, and obtaining a test curve of the data channel to be detected according to the second test optical signal. The embodiment of the invention facilitates detection and fault location of the optical fiber link.

Description

Optical fiber link detection method, optical line terminal and passive optical network

Technical field

The embodiment of the invention relates to communication technical field, particularly a kind of optical fiber link detection method, optical line terminal and passive optical network.

Background technology

At present, Optical Access Network has become the strong competitor of broadband access network of future generation, and is wherein especially more competitive with EPON.Usually; EPON (Passive Optical Network; PON) system comprise an optical line terminal that is positioned at the central office (Optical Line Terminal, OLT), an optical distribution network (Optical Distribution Network who is used for branch/coupling or multiplex/demultiplex; ODN) and some optical network units (Optical Network Unit, ONU).

At fiber optic communication field, (Optical Time Domain Reflectrometer OTDR) is a kind of very important tester to optical time domain reflectometer.OTDR is through emissioning testing signal in testing fiber, and retroreflection in the measuring optical fiber and scattered signal are known the state information of testing fiber circuit, thereby judges that case point is analyzed and fault location on the testing fiber.

Existing OTDR equipment volume is big, and complicated operation requires than higher operators'skills, when using OTDR that optical fiber link is tested, need on the test interface of reserving on the fiber optic network, insert OTDR, makes the failure detection operations process complicated.

Summary of the invention

The embodiment of the invention provides a kind of optical fiber link detection method, optical line terminal and passive optical network, so that optical fiber link is detected and fault location.

On the one hand, the embodiment of the invention provides a kind of optical line terminal, comprising: at least one transceiver and checkout gear;

Said transceiver is used for sending the first test light signal to the testing data passage, and wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;

Said checkout gear is used to receive the second test light signal that the said first test light signal returns after through said testing data channel transfer, and according to the said second test light signal, obtains the test curve of said testing data passage.

On the other hand, the embodiment of the invention also provides a kind of passive optical network, comprising: optical line terminal, Optical Distribution Network and at least one optical network unit;

Said optical line terminal comprises: at least one transceiver and checkout gear;

Said transceiver is used for sending the first test light signal to the testing data passage; Wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;

Said checkout gear is used to receive the second test light signal that the said first test light signal returns after through said testing data channel transfer, and according to the said second test light signal, obtains the test curve of said testing data passage.

On the one hand, the embodiment of the invention also provides a kind of optical fiber link detection method, comprising again:

Optical line terminal sends the first test light signal to the testing data passage, and wherein, said testing data passage is any circuit-switched data passage between said optical line terminal and the optical network unit;

Said optical line terminal receives the second test light signal that the said first test light signal returns after through said testing data channel transfer;

Said optical line terminal obtains the test curve of said testing data passage according to the said second test light signal.

Optical fiber link detection method, optical line terminal and passive optical network that the embodiment of the invention provides; Send the first test light signal that is used for the detection fiber link through the transceiver in the optical line terminal; And in optical line terminal, be provided for receiving the second test light signal that the first test light signal returns after through the testing data channel transfer and draw the checkout gear of testing result to the second test light signal, thereby be convenient to the detection and the fault location of optical fiber link more according to the back.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of an embodiment of optical line terminal provided by the invention;

Fig. 2 is the structural representation of another embodiment of optical line terminal provided by the invention;

Fig. 3 is the structural representation of an embodiment of passive optical network provided by the invention;

Fig. 4 is the structural representation of another embodiment of passive optical network provided by the invention;

Fig. 5 is the structural representation of another embodiment of passive optical network provided by the invention;

Fig. 6 is the flow chart of an embodiment of optical fiber link detection method provided by the invention.

Embodiment

To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.

Fig. 1 is the structural representation of an embodiment of optical line terminal provided by the invention, and is as shown in Figure 1, and this optical line terminal comprises: at least onetransceiver 1 andcheckout gear 2;

Transceiver 1 can be used for sending the first test light signal to the testing data passage, and wherein, this testing data passage is any circuit-switched data passage between optical line terminal and the optical network unit;

Checkout gear 2 can be used to receive the second test light signal that the first test light signal returns after through the testing data channel transfer, and according to the second test light signal, obtain the test curve of testing data passage.

The optical line terminal OLT that the embodiment of the invention provides; Be applicable to asynchronous transfer mode EPON (Asynchronous Transfer Mode PON; ATM-PON), the EPON based on Ethernet (Ethernet), Wave division multiplexing passive optical network (Wave Division Multiplexing, polytype EPON such as WDM-PON).

The OLT that present embodiment provides can comprise at least onetransceiver 1, andtransceiver 1 can be used for sending downstream signal to ONU, and receives the upward signal that ONU sends.Further, the OLT that present embodiment provides, also integrated being used for detected the OTDR function with fault location to the optical fiber link between OLT and the ONU on it.

Need to prove, owing to have at least onetransceiver 1 among the OLT, in the optical fiber link between OLT and the ONU (physical link); Can regard as and have multichannel data passage (logical links); Therefore, eachtransceiver 1 can be corresponding with an ONU, and eachtransceiver 1 can be corresponding with a circuit-switched data passage; Therefore; The first test light signal that eachtransceiver 1 sends can be used to detect the circuit-switched data passage between thistransceiver 1 and the ONU, perhaps, is used for the fault of the data channel between thistransceiver 1 and the ONU is positioned.At least onetransceiver 1 among the OLT can sharedcheckout gear 2; Be thatcheckout gear 2 can receive the second test light signal thatarbitrary transceiver 1 sends among the OLT the first test light signal returns, and then the data channel betweenarbitrary transceiver 1 and the ONU is detected and fault location.

Wherein, when the optical fiber link of the first test light signal between OLT to ONU transmits, scattering possibly take place (for example: Rayleigh scattering), and (for example: Rayleigh scattering signal) produce scattered signal; Also possibly run into barrier point and (for example: Fresnel reflection), and produce reflected signal reflect.Therefore, the second test light signal that returns after through the testing data channel transfer of the first test light signal can comprise scattered signal and/or reflected signal.This second test light signal can return OLT along the optical fiber link of OLT to ONU;Checkout gear 2 can be used to receive the second test light signal; And can further obtain the testing result of the optical fiber link of OLT to ONU according to the second test light signal, testing result can adopt test curve to represent usually.Wherein,checkout gear 2 can comprise photodetector, pre-amplifier or parts such as trans-impedance amplifier, analog to digital converter.Checkout gear can adopt existing the whole bag of tricks, obtains the test curve of the optical fiber link of OLT to ONU to light signal according to the back.

Eachtransceiver 1 can periodically detect the data channel betweentransceiver 1 and the ONU, that is,transceiver 1 can periodically send the first test light signal; Perhaps, eachtransceiver 1 also can send the first test light signal and carries out data channel and detect when receiving local control command of OLT or Long-distance Control; Perhaps,transceiver 1 can also and ONU between data channel on up luminous power send the first test light signal when situation such as unusual occurring, so that the data channel betweentransceiver 1 and the ONU is carried out fault location.The trigger condition thattransceiver 1 sends the first test light signal can be provided with as required, does not enumerate one by one at this.

Have at OLT under the situation of a plurality oftransceivers 1, whenarbitrary transceiver 1 sends the first test light signal, as a kind of enforcement scene of present embodiment; Thetransceiver 1 that sends the first test light signal can normally carry out the transmission of downstream signal, perhaps, can stop the transmission of downstream signal; Perhaps; Can also the first test light signal be modulated at above the downlink data, that is, adopt the first test light signal that downlink data is carried out amplitude modulation(PAM).Other transceivers 1 for except that thetransceiver 1 that sends the first test light signal can normally send downstream signal.But the backward signal and the second test light signal of the downstream signal that sends for fear of other transceivers together get intocheckout gear 2; Thereby influence testing result; Another kind as present embodiment is implemented scene;Other transceivers 1 except that thetransceiver 1 that sends the first test light signal can stop the transmission of downstream signal.

The optical line terminal that present embodiment provides; Send the first test light signal that is used for the detection fiber link through the transceiver among the OLT; And in OLT, be provided for receiving the second test light signal that the first test light signal returns after through the testing data channel transfer and draw fault detect result's checkout gear according to the second test light signal; Thereby the OTDR function that will detect is integrated into the OLT end; When the optical fiber link between OLT and ONU broke down, the transceiver that can directly start on the OLT sent the first test light signal, and adopted the checkout gear that is integrated on the OLT to receive the test curve that the second test light signal draws link between transceiver and the ONU; Thereby can further can calculate the fault detect result, thereby be convenient to the detection and the fault location of optical fiber link more according to test curve.In addition; Send the first test light signal through the transceiver among the OLT; And in OLT, be provided for receiving the checkout gear that the second test light signal draws the link detecting result; Thereby the OTDR function that will carry out link detecting is integrated into the OLT end, on OLT, can pass through local command line or Long-distance Control or periodic triggers mode, and the transceiver that starts on the OLT sends the first test light signal; And adopt the checkout gear that is integrated on the OLT to receive the test curve that the second test light signal draws link between transceiver and the ONU, thereby can further can calculate or judge optical fiber link state or variation tendency according to test curve.

Fig. 2 is the structural representation of another embodiment of optical line terminal provided by the invention, and is as shown in Figure 2, and this optical line terminal OLT comprises: at least onetransceiver 1 andcheckout gear 2;

Thetransceiver 1 that the embodiment of the invention provides can be the structure that integrates of transmitter and receiver; Perhaps, can also cooperate the function that realizestransceiver 1 jointly by a plurality of functional units.Present embodiment provides a kind of feasible configurations oftransceiver 1, andtransceiver 1 can comprise: and first receiver 11 and reflective semiconductor amplifier 12 (Reflective Semiconductor Optical Amplifier, RSOA); Wherein:

First receiver 11 can be used to receive the upward signal that ONU sends;

RSOA12 can be used for sending the first test light signal to ONU.

Optional, among the OLT, perhaps in thetransceiver 1 wavelength division multiplexer WDM13 can also be set further, through this WDM13 the upward signal that the ONU that receives sends is sent to said first receiver 11, and is used for the downstream signal that RSOA12 sends is sent to ONU.

Under a kind of enforcement scene, eachtransceiver 1 that the embodiment of the invention provides (specifically can be the RSOA12 in the transceiver 1) can periodically send the first test light signal with the data channel between detection and the ONU.

Implement under the scene at another kind, send the first test light signal under the triggering of the test control command that the remote equipment that transceiver 1 (specifically can be the RSOA12 in the transceiver 1) can also perhaps be connected with OLT in the test control command that send OLT this locality sends.Perhaps; OLT can also be provided with certain test trigger condition in advance; Specifically can be; For example: whether satisfy certain test period, whether the upward signal power that receives on the data channel between perhaps acertain transceiver 1 and the ONU is unusual, and catastrophe failure etc. appears in the data channel between perhaps acertain transceiver 1 and the ONU.When satisfying the test trigger condition, then OLT can send test instruction to the corresponding transceiver 11 (specifically can be the RSOA12 in the transceiver 1) of testing data passage, starts the corresponding transceiver of testing data passage and sends the first test light signal.

Thecheckout gear 2 that the embodiment of the invention provides can be for integrating structure; Perhaps, can also cooperate the function that realizescheckout gear 2 jointly by a plurality of functional units.Present embodiment provides a kind of feasible configurations ofcheckout gear 2, and checkout gear can comprise:second receiver 21,processor 22 andcontroller 23; Wherein:

Second receiver 21 can be used to receive the second test light signal;

Processor 22 can be used for obtaining test curve according to the second test light signal thatsecond receiver 21 receives.

Under a kind of enforcement scene, checkout gear 2 (specifically can be second receiver 21) can cooperate with eachtransceiver 1, periodically receivestransceiver 1 and sends the second test light signal, and draw corresponding test curve throughprocessor 22.

Implement under the scene at another kind; Start the reception second test light signal under the triggering of the reception control command that the remote equipment that checkout gear 2 (specifically can be second receiver 21) also can perhaps be connected with OLT in the reception control command that send OLT this locality sends, and draw corresponding test curve through processor 22.Perhaps, checkout gear 2 (specifically can be second receiver 21) can also trigger after satisfying the test trigger condition and receive the second test light signal.

Can under the triggering of the local perhaps remote equipment of OLT, send the first test light signal based on above-mentionedtransceiver 1; Andcheckout gear 2 can receive the execution mode of the second test light signal under the triggering of the local perhaps remote equipment of OLT; Among the OLT that the embodiment of the invention provides; On thecheckout gear 2 among OLT or theOLT controller 23 can be set further, wherein:

Controller 23 can be used to receive the test control command that OLT is local or remote equipment sends; Or after satisfying the test trigger condition; The transceiver 1 (specifically can be RSOA12 in transceiver) corresponding to the testing data passage sends test instruction; Send the first test light signal to start the corresponding transceiver oftesting data passage 1, and detection starting device 2 (specifically can besecond receiver 21 in the checkout gear 2) receives the second test light signal.

Wherein,controller 23 can be for being integrated in the control unit in thecheckout gear 2, also can go up the Control Software that loads or OLT through OLT and go up the medium access control that is provided with (Media Access Control, MAC) chip is realized its controlled function.

Controller 23 can be waited for the test control command that OLT this locality issues; The test control command that other equipment that perhaps are connected with OLT are assigned; After waiting to receive the test control command;Controller 23 can send test instruction to the corresponding transceiver 1 (specifically can be RSOA12) of testing data passage, starts the corresponding transceiver oftesting data passage 1 and sends the first test light signal; Andcontroller 23 can also be tested under the triggering of control command, and detection starting device 2 (specifically can be second receiver 21) receives the second test light signal; Perhaps,controller 23 can also be provided with certain test trigger condition in advance, specifically can be, for example: whether satisfy certain test period, whether the up received optical power on the data channel between perhaps acertain transceiver 1 and the ONU is unusual etc.When satisfying the test trigger condition, thencontroller 23 can send test instruction to thecorresponding transceiver 1 of testing data passage, starts the corresponding transceiver of testing data passage and sends the first test light signal; Andcontroller 23 can also be under the triggering of test control command, anddetection starting device 2 receives the second test light signal thatarbitrary transceiver 1 sends.

The OLT that the embodiment of the invention provides; Need detect the circuit-switched data passage between optical line terminal and the ONU or during fault location; Thecorresponding transceiver 1 of this data channel to be detected need send the first test light signal; Alltransceivers 1 among the OLT comprise that promptly needs send thetransceiver 1 of the first test light signal, can stop the transmission of downstream signal; Perhaps, other transceivers except that thecorresponding transceiver 1 of data channel to be detected can stop the transmission of downstream signal.

As a kind of possible implementation, the above-mentioned operation that stops transceiver 1 transmission downstream signal can be triggered by controller 23.Specifically can be;Controller 23 can send halt instruction to testing data passagecorresponding transceiver 1 andother transceivers 1; Perhaps; Can also send halt instruction byother transceivers 1 outside thecorresponding transceiver 1 of testing data passage,, indicatetransceiver 1 to stop to send downstream signal through this halt instruction.

The OLT that the embodiment of the invention provides; Need detect the circuit-switched data passage between optical line terminal and the ONU or during fault location; Thecorresponding transceiver 1 of this data channel to be detected need send the first test light signal; In order not influence the downstream signal transmission of other transceivers except that the transceiver that need send the firsttest light signal 1, and the backward signal that reduces the downstream signal thatother transceivers 1 send gets into the influence of 2 pairs of testing results of checkout gear, further; The OLT that the embodiment of the invention provides; Can further include:tunable filter 24, thistunable filter 24 can be arranged on OLT inside, also can be arranged oncheckout gear 2 inside among the OLT.Wherein:

Thistunable filter 24 can be used for other light signals outside the filtering second test light signal, so that the second test light signal gets intocheckout gear 2.

Under a kind of enforcement scene of present embodiment; The free transmission range of tunable filter 24 (also can become passband width) can cover the bandwidth chahnel of the arbitrary data channel between OLT and the ONU; Promptly; Can realize thattunable filter 24 allows the light signal of the bands window wavelength of the arbitrary data channel between OLT and the ONU to pass through the light signal of the bands window wavelength of other data channel of filtering through free transmission range setting to tunable filter 24.For example: each data channel is spaced apart 0.4nm, and bands window width (being bandwidth chahnel) also is 0.4nm, supposes that three adjacent data passages are respectively i-1, i and i+1; The bands window wave-length coverage is respectively: [x-1.0nm, x-0.6nm], [x-0.2nm, x+0.2nm] and [x+0.6nm; X+1.0nm]; Whenadjustable filtering 24 is adjusted to and matees with data channel i (bandwidth chahnel of the free transmission range cover data passage i of tunable filter 24), that is, and when only allowing the light signal of the bands window wavelength of data channel i to pass through; Then have only the interior wavelength of [x-0.2nm, x+0.2nm] window could pass throughtunable filter 24 and arrive checkout gear 2.In this case, the passband width oftunable filter 24 can be narrower than the passband width of each data channel, and for example: the passband width of data channel is 0.4nm, and then the passband width oftunable filter 24 can be set to 0.3nm; Perhaps; The passband width oftunable filter 24 also can be wideer than the passband width of each data channel, and for example: the passband width of data channel is 0.4nm, and then the passband width oftunable filter 24 can be set to 0.5nm; Even the centre wavelength of the passband oftunable filter 24 can be in full accord with the centre wavelength of data channel; For example: the centre wavelength of data channel i is xnm, andtunable filter 24 is during with data channel i coupling, and centre wavelength can be x+0.1nm.

Another kind at present embodiment is implemented under the scene, and the free transmission range oftunable filter 24 can cover the bandwidth chahnel of an above data channel between OLT and the ONU, that is,tunable filter 24 also can be to divide into groups to regulate.For example:tunable filter 24 can cover the bandwidth chahnel of 2 or a few data channel, and for example: when the passband of each data channel is 0.4nm, be spaced apart 0.4nm, then the passband width oftunable filter 24 can be 1.6nm.When data passage i is tested; Then can be transferred to the centre wavelength oftunable filter 24 in the passband of data channel i; The backward signal of the 1 adjacent data passages of data channel i also can pass throughtunable filter 24 and device to be detected 2 receptions, in this case, owing to have only the backward signal of the downstream signal of a few adjacent data passage can influence the testing result of testing data passage; Therefore, also can improve the accuracy of testing result to a certain extent.

As a kind of possible implementation; Can control by 23 pairs oftunable filters 23 of controller; Specifically can be: aftercontroller 23 receives the test control command or satisfies the test trigger condition; Can send regulating command totunable filter 24; Be set to cover the bandwidth chahnel of testing data passage to controltunable filter 24 free transmission ranges, thus the second test light signal that returns after the first test light signal that the corresponding transceiver oftesting data passage 1 is sent transmits through data channel, can device to be detected 2 receptions throughtunable filter 24.

Technical at the foregoing description; Aftercheckout gear 2 draws testing result;Checkout gear 2 can be uploaded test curve according to the control command of uploading of other equipment under the triggering of other equipment that are connected with OLT, perhaps according to showing that control command shows test curve.

More than several embodiment several kinds of feasible configurations of the OLT of integrated checkout gear function are provided; The OLT that provides based on the embodiment of the invention; The embodiment of the invention also further provides a kind of passive optical network; As shown in Figure 3, this passive optical network can comprise:optical line terminal 31,Optical Distribution Network 32 and at least oneoptical network unit 33; Wherein:

Optical line terminal 31 can comprise: at least one transceiver and checkout gear;

Transceiver can be used for sending the first test light signal to the testing data passage, and wherein, the testing data passage is any circuit-switched data passage between optical line terminal and the optical network unit;

Checkout gear can be used to receive the second test light signal that the first test light signal returns after through the testing data channel transfer, and according to the second test light signal, obtain the test curve of testing data passage.

The passive optical network that present embodiment provides specifically can be ATM-PON, based on polytype EPONs such as the EPON of Ethernet or WDM-PON, do not enumerate one by one at this.

Optional; The passive optical network that the embodiment of the invention provides; Optical line terminal wherein can also comprise: controller, and after being used for the acceptance test control command or satisfying the test trigger condition, the transceiver corresponding to the testing data passage sends test instruction; Send the first test light signal to start the corresponding transceiver of testing data passage, and the detection starting device receives the second test light signal.

Optional, optical line terminal also comprises: tunable filter is used for other light signals outside the filtering second test light signal, so that the second test light signal gets into checkout gear.

Further, controller can also be used for: other transceivers outside the corresponding transceiver of testing data passage send halt instruction, and halt instruction is used for indication and stops to send downstream signal.Perhaps, controller can also be used for: transceiver and other transceiver corresponding to the testing data passage send halt instruction.

The OLT31 that relates in the present embodiment, the detailed process that its concrete structure and execution optical fiber link thereof detect can repeat no more at this referring to the embodiment of optical line terminal provided by the invention.

The passive optical network that present embodiment provides; Send the first test light signal that is used for the detection fiber link through the transceiver among the OLT; And be provided in OLT receiving that the first test light signal transmits the second test light signal that returns in data channel and draw link detecting result's checkout gear according to the second test light signal; Thereby the checkout gear function that will carry out link detecting is integrated into the OLT end; When the link between OLT and ONU breaks down; The transceiver that can directly start on the OLT sends the first test light signal, and adopts the checkout gear be integrated on the OLT to receive the second test light signal to draw testing result, thereby is convenient to the detection and the fault location of optical fiber link more.

In existing multiple PON system, WDM-PON has obtained application more and more widely with the advantages such as Information Security of its huge broadband capacity, similarity point to-point communication.Therefore, the present invention is an example with the WDM-PON system, and the system architecture of the passive optical network that the embodiment of the invention is provided and the optical fiber link process fault detection of execution thereof describe.

Fig. 4 is the structural representation of another embodiment of passive optical network provided by the invention; As shown in Figure 4; This WDM-PON system is comprising opticalline terminal OLT 31, on the basis of Optical Distribution Network ODN32 and at least one opticalnetwork unit ONU 33; Further, ODN32 can comprise: first waveguideoptical grating 321 and second waveguideoptical grating 322;

First waveguideoptical grating 321 and second waveguideoptical grating 322 can be array waveguide grating (Array Waveguide Grating, AWG), perhaps, can also be waveguide grating router (Waveguide Grating Router, WGR).

As a kind of possible implementation, first waveguideoptical grating 321 can comprise: test port and at least one first port; Second waveguideoptical grating 322 can comprise at least one second port; Wherein, Because the downstream signal wavelength that each transceiver sends among the OLT31 is different; The upstream signal wavelengths that each ONU33 sends is also different; Therefore, each first port in first waveguideoptical grating 321 and each second port in second waveguideoptical grating 322 are usually only with the wavelength signals through a window or one-period property window.And the wavelength of the first test light signal that each transceiver sends among the OLT31 can be identical, therefore, can receive the second test light signal that arbitrary transceiver sends among the OLT31 the first test light signal returns after through the data channel transmission in the test port.

Wherein, each first port can be corresponding with transceiver and one second port in second waveguideoptical grating 322 among the OLT31, can be used for the first test light signal that the OLT31 transceiver sends is sent to the second corresponding port;

Each second port can be corresponding with an ONU33, can be used to receive the first test light signal that the first corresponding port sends, and the first test light signal is exported to corresponding ONU33;

Test port can be used to receive the second test light signal, and the second test light signal is sent to the checkout gear among the OLT31.

Be example to have 64 data passages between OLT31 and the ONU33 among Fig. 4, the WDM-PON system architecture that present embodiment is provided describes, but not with this as limitation of the present invention.Having 64 transceivers among the OLT31, have 64 ONU33 in this system, is a data passages between transceiver and the ONU33.Accordingly, can comprise 64 first ports in first waveguideoptical grating 321, respectively withnumeral 1～64 sign, test port is with numeral 0 sign in Fig. 4; Second waveguideoptical grating 322 also can comprise 64 second ports, in Fig. 4, also identifies with numeral 1～64 respectively.

Wherein, each transceiver can comprise first receiver, RSOA and WDM, and similarly, in the ONU side, each ONU also can comprise receiver, RSOA and WDM.

The checkout gear of OLT31 side can comprise second receiver and processor; The test control command that other equipment that checkout gear among the OLT31 can basis be connected with OLT31 send triggers the detection to arbitrary data channel; Perhaps OLT31 receives the detection that the local command line control command starts arbitrary data channel, and perhaps, the checkout gear among the OLT31 also can be provided with certain test trigger condition; Trigger test condition when satisfying, then trigger detection arbitrary data channel.

In the enforcement scene that present embodiment provides; When needs are tested a certain data channel; Controller can be set in OLT; To whole transceivers, or these other transceivers except that the corresponding transceiver of testing data passage send halt instructions, indicate transceiver to stop to send downstream signal through this halt instruction through this controller.

Wherein, controller starts step and controller that the corresponding transceiver of testing data passage sends the first test light signal and triggers step that other transceivers stop to send downstream signal in no particular order.Stopping transceiver transmission downstream signal specifically can realize through the data channel of cutting off RSOA or the modulated current of closing RSOA.Before the corresponding transceiver of controller startup testing data passage sends the first test light signal; Can turn-off automated power control (APC) parts of RSOA, stop the work of APC, after test is accomplished; Controller can be opened automated power control (APC) parts of RSOA, restarts APC work.

Concrete, when testing, for the transceiver of testing data passage correspondence; If stop the transmission of downstream signal, then the RSOA in the transceiver can directly send the first test light signal with data mode, if do not stop the transmission of downstream signal; Then the RSOA in the transceiver can send the first test light signal with the mode of remodulates; That is, the first test light signal is modulated at above the downstream signal, adopts the first test light signal that downstream signal is carried out amplitude modulation(PAM).The first test light signal can be pulsed optical signals, pulse train (for example: pseudorandom PN sequence) or frequency signal.RSOA can send the first test light signal through first corresponding in first waveguide optical grating 321 port; In the process that this first test light signal transmits in the data channel of correspondence; Scattering and/or reflection can take place; The second test light signal (comprising back scattering and/or reflected signal) that produces will be back to the OLT31 side along this data channel; Second light signal that returns can be through the test port in first waveguide optical grating 321; Be that No. 0 port shown in Figure 4 gets in second receiver of checkout gear, the processor in the checkout gear can be according to the type (type of the second test light signal is consistent with the type of the first test light signal usually, for example: pulsed optical signals, pulse train or frequency signal etc.) of the second test light signal; Adopt existing algorithms of different (for example: average calculating operation, related operation etc.) to handle, obtain the test curve of testing data passage.

Implement under the scene at this; Because other transceivers except that the corresponding transceiver of testing data passage all stop to send downstream signal; Therefore; Usually there are not other interference signals in the second test light signal that second receiver receives in the checkout gear, therefore, can obtain test result comparatively accurately.

In another enforcement scene that present embodiment provides, when needs were tested a certain data channel, the whole transceivers among the OLT31 can send downstream signal as usual.

Under this enforcement scene; Because other transceivers except that the corresponding transceiver of testing data passage still send downstream signal; Therefore, the back of the downstream signal that sends in all data channel all can pass through second receiver that test port gets into checkout gear to light signal.These signals are optical noises for the second test light signal.Because the intensity of the second test light signal is certain; Therefore; The quantity of other data channel is many more, the downstream signal of other corresponding data channel back strong more to light signal strength, and the signal to noise ratio of the second test light signal that second receiver in the checkout gear receives is just poor more.And under this enforcement scene; In order to obtain comparatively accurate testing result; Improve the second test light Signal-to-Noise that gets in the checkout gear; The first test light signal (for example: the PN sequence) or frequency signal can be preferably pulse train; After checkout gear receives the second test light signal, also can further improve the second test light Signal-to-Noise (for example: can average repeatedly testing the second test light signal that receives earlier, carry out the relevant test curve that calculates with the pulse train of sending again) through relevant algorithm.

In order to take into account testing result and normal downstream signal transmission.Under another enforcement scene that present embodiment provides; The back to light signal of downstream signal that tunable filter sends in other all data channel or the partial data passage of filtering except that the testing data passage can further be set in OLT, thereby shield the back of these downstream signals to the influence of light signal to the second test light signal.Wherein, the concrete setting of tunable filter and the course of work can repeat no more at this referring to the associated description among the optical line terminal embodiment.

In above-mentioned enforcement scene, OLT can one accomplishes the test of all data channel in test period, specifically can test according to the numeric order of data channel, and OLT also can only test a data passages a test period.

In addition; Owing to connect through optical fiber between first waveguideoptical grating 321 and second waveguideoptical grating 322; For the first port input of upward signal from first waveguideoptical grating 321 that guarantees that ONU33 side direction OLT sends, and guarantee the test port input of the second test light signal from first waveguideoptical grating 321, as a kind of possible implementation; As shown in Figure 5, between first waveguideoptical grating 321 and second waveguideoptical grating 322circulator 34 can be arranged;

Thiscirculator 34 can comprise: first interface 341,second interface 342 and the 3rd interface 343;

Wherein, first interface 341 is used for receiving the first test light signal that first waveguide optical grating, 321 arbitrary first ports are exported, and exports the first test light signal to the 3rd interface 343;

The 3rd interface 343 is used to receive the first test light signal that first interface is exported, and the first test light signal is sent to second corresponding in second waveguideoptical grating 322 port; Also be used for receiving the second test light signal that first waveguide optical grating, 321 arbitrary first ports send, and export the second test light signal tosecond interface 342;

Second interface 342 is used for the second test light signal that receives from the 3rd interface is sent to checkout gear.

Fig. 6 is the flow chart of an embodiment of optical fiber link detection method provided by the invention; As shown in Figure 6; This method comprises: S101, optical line terminal send the first test light signal to the testing data passage; Wherein, the testing data passage is any circuit-switched data passage between optical line terminal and the optical network unit;

S102, optical line terminal receive the second test light signal that the first test light signal returns after through the testing data channel transfer;

S103, optical line terminal obtain the test curve of testing data passage according to the second test light signal.

Wherein, Can send the first test light signal to the testing data passage through the transceiver in the optical line terminal; Can receive the second test light signal that the first test light signal returns after through the testing data channel transfer through the checkout gear that is provided with in the optical line terminal, and obtain the test curve of testing data passage according to the second test light signal.

As a kind of possible implementation, the test control command that optical line terminal can send according to this locality, perhaps the test control command sent of remote equipment triggers and sends the first test light signal and receive the second test light signal to the testing data passage; As another kind of possible implementation, optical line terminal can also trigger and send the first test light signal and receive the second test light signal to the testing data passage after satisfy certain test trigger condition.

In addition, optical line terminal is before sending the first test light signal to the testing data passage, and other data channel that can also stop outside the testing data passage are sent downstream signal; Perhaps, stop to send downstream signal, get into optical line terminal to light signal, the second test light signal is caused interference to avoid the back of downstream signal to testing data passage and other data channel.

The optical fiber link detection method that the embodiment of the invention provides, the structure and the function thereof of its concrete equipment optical line terminal of realizing all can repeat no more at this with reference to the associated description of optical line terminal embodiment provided by the invention.

The optical fiber link detection method that present embodiment provides; Send the first test light signal that is used for the detection fiber link through the transceiver among the OLT; And in OLT, be provided for receiving the second test light signal that the first test light signal returns after through the testing data channel transfer and draw the checkout gear of testing result to the second test light signal, thereby be convenient to the detection and the fault location of optical fiber link more according to the back.

What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.

Claims (15)

Translated fromChinese

1.一种光线路终端，其特征在于，包括：至少一个收发器和检测装置；1. An optical line terminal, characterized in that it comprises: at least one transceiver and a detection device;所述收发器，用于向待测数据通道发送第一测试光信号，其中，所述待测数据通道为所述光线路终端与光网络单元之间的任意一路数据通道；The transceiver is configured to send a first test optical signal to the data channel to be tested, wherein the data channel to be tested is any data channel between the optical line terminal and the optical network unit;所述检测装置，用于接收所述第一测试光信号通过所述待测数据通道传输后返回的第二测试光信号，并根据所述第二测试光信号，获得所述待测数据通道的测试曲线。The detection device is configured to receive the second test optical signal returned after the first test optical signal is transmitted through the data channel to be tested, and obtain the data channel of the test data channel according to the second test optical signal test curve.2.根据权利要求1所述的光线路终端，其特征在于，还包括：2. The optical line terminal according to claim 1, further comprising:控制器，用于接收测试控制指令或者满足测试触发条件后，向所述待测数据通道对应的所述收发器发送测试指令，以启动所述待测数据通道对应的收发器发送所述第一测试光信号，并启动所述检测装置接收所述第二测试光信号。The controller is configured to send a test instruction to the transceiver corresponding to the data channel to be tested after receiving a test control instruction or satisfying a test trigger condition, so as to start the transceiver corresponding to the data channel to be tested to send the first test the light signal, and start the detection device to receive the second test light signal.3.根据权利要求1或2所述的光线路终端，其特征在于，还包括：3. The optical line terminal according to claim 1 or 2, further comprising:可调滤波器，用于滤除所述第二测试光信号之外的其他光信号，以使所述第二测试光信号进入所述检测装置。An adjustable filter is used to filter out other optical signals except the second test optical signal, so that the second test optical signal enters the detection device.4.根据权利要求2或3所述的光线路终端，其特征在于，所述控制器还用于：向所述待测数据通道对应的所述收发器之外的其他收发器发送停止指令，所述停止指令用于指示停止发送下行信号。4. The optical line terminal according to claim 2 or 3, wherein the controller is further configured to: send a stop instruction to other transceivers other than the transceiver corresponding to the data channel to be tested, The stop instruction is used to instruct to stop sending downlink signals.5.根据权利要求2所述的光线路终端，其特征在于，所述控制器还用于：向所述待测数据通道对应的所述收发器以及其他收发器发送所述停止指令。5. The optical line terminal according to claim 2, wherein the controller is further configured to: send the stop instruction to the transceiver corresponding to the data channel to be tested and other transceivers.6.一种无源光网络系统，其特征在于，包括：光线路终端、光分配网络和至少一个光网络单元；6. A passive optical network system, comprising: an optical line terminal, an optical distribution network, and at least one optical network unit;所述光线路终端包括：至少一个收发器和检测装置；The optical line terminal includes: at least one transceiver and detection means;所述收发器，用于向待测数据通道发送第一测试光信号；其中，所述待测数据通道为所述光线路终端与光网络单元之间的任意一路数据通道；The transceiver is configured to send a first test optical signal to the data channel to be tested; wherein the data channel to be tested is any data channel between the optical line terminal and the optical network unit;所述检测装置，用于接收所述第一测试光信号通过所述待测数据通道传输后返回的第二测试光信号，并根据所述第二测试光信号，获得所述待测数据通道的测试曲线。The detection device is configured to receive the second test optical signal returned after the first test optical signal is transmitted through the data channel to be tested, and obtain the data channel of the test data channel according to the second test optical signal test curve.7.根据权利要求6所述的无源光网络系统，其特征在于，所述光线路终端还包括：7. The passive optical network system according to claim 6, wherein the optical line terminal further comprises:控制器，用于接收测试控制指令或者满足测试触发条件后，向所述待测数据通道对应的所述收发器发送测试指令，以启动所述待测数据通道对应的收发器发送所述第一测试光信号，并启动所述检测装置接收所述第二测试光信号。The controller is configured to send a test instruction to the transceiver corresponding to the data channel to be tested after receiving a test control instruction or satisfying a test trigger condition, so as to start the transceiver corresponding to the data channel to be tested to send the first test the light signal, and start the detection device to receive the second test light signal.8.根据权利要求6或7所述的无源光网络系统，其特征在于，所述光线路终端还包括：8. The passive optical network system according to claim 6 or 7, wherein the optical line terminal further comprises:可调滤波器，用于滤除所述第二测试光信号之外的其他光信号，以使所述第二测试光信号进入所述检测装置。An adjustable filter is used to filter out other optical signals except the second test optical signal, so that the second test optical signal enters the detection device.9.根据权利要求7或8所述的无源光网络系统，其特征在于，所述控制器还用于：向所述待测数据通道对应的所述收发器之外的其他收发器发送停止指令，所述停止指令用于指示停止发送下行信号。9. The passive optical network system according to claim 7 or 8, wherein the controller is further configured to: send a stop signal to other transceivers other than the transceiver corresponding to the data channel to be tested Instruction, the stop instruction is used to instruct to stop sending the downlink signal.10.根据权利要求7所述的无源光网络系统，其特征在于，所述控制器还用于：向所述待测数据通道对应的所述收发器以及其他收发器发送所述停止指令。10. The passive optical network system according to claim 7, wherein the controller is further configured to: send the stop instruction to the transceiver corresponding to the data channel to be tested and other transceivers.11.根据权利要求6-10任一项所述的无源光网络系统，其特征在于，所述光分配网络包括：第一波导光栅和第二波导光栅；所述第一波导光栅包括：测试端口和至少一个第一端口；所述第二波导光栅包括至少一个第二端口；11. The passive optical network system according to any one of claims 6-10, wherein the optical distribution network comprises: a first waveguide grating and a second waveguide grating; the first waveguide grating comprises: a test port and at least one first port; said second waveguide grating includes at least one second port;每个所述第一端口分别与所述光线路终端中的一个收发器和所述第二波导光栅中的一个所述第二端口相对应，用于接收对应的所述收发器发送的所述第一测试光信号，并将所述第一测试光信号输出给对应的所述第二端口；Each of the first ports corresponds to a transceiver in the optical line terminal and a second port in the second waveguide grating, and is used to receive the a first test optical signal, and output the first test optical signal to the corresponding second port;每个所述第二端口与一个所述光网络单元对应，用于接收对应的所述第一端口发送的所述第一测试光信号，并将所述第一测试光信号输出给对应的所述光网络单元；Each of the second ports corresponds to one of the optical network units, and is used to receive the first test optical signal sent by the corresponding first port, and output the first test optical signal to the corresponding The optical network unit;所述测试端口，用于接收所述第二测试光信号，并将所述第二测试光信号发送给所述光线路终端中的光时域反射计检测装置。The test port is configured to receive the second test optical signal and send the second test optical signal to the optical time domain reflectometer detection device in the optical line terminal.12.根据权利要求11所述的无源光网络系统，其特征在于，所述第一波导光栅和第二波导光栅之间还包括：环形器，所述环形器包括：第一接口、第二接口和第三接口；12. The passive optical network system according to claim 11, wherein a circulator is further included between the first waveguide grating and the second waveguide grating, and the circulator includes: a first interface, a second an interface and a third interface;所述第一接口，用于接收所述第一波导光栅中任一所述第一端口输出的所述第一测试光信号，并将所述第一测试光信号输出至所述第三接口；The first interface is configured to receive the first test optical signal output by any one of the first ports in the first waveguide grating, and output the first test optical signal to the third interface;所述第三接口，用于接收所述第一接口输出的所述第一测试光信号，并将所述第一测试光信号发送给所述第二波导光栅中对应的所述第二端口；还用于接收所述第二测试光信号，并将所述第二测试光信号输出至所述第二接口；The third interface is configured to receive the first test optical signal output by the first interface, and send the first test optical signal to the corresponding second port in the second waveguide grating; Also for receiving the second test optical signal, and outputting the second test optical signal to the second interface;所述第二接口，用于将所述第三接口输出的所述第二测试光信号发送至所述检测装置。The second interface is configured to send the second test optical signal output by the third interface to the detection device.13.一种光纤链路检测方法，其特征在于，包括：13. A method for detecting an optical fiber link, comprising:光线路终端向待测数据通道发送第一测试光信号，其中，所述待测数据通道为所述光线路终端与光网络单元之间的任意一路数据通道；The optical line terminal sends a first test optical signal to the data channel to be tested, wherein the data channel to be tested is any data channel between the optical line terminal and the optical network unit;所述光线路终端接收所述第一测试光信号通过所述待测数据通道传输后返回的第二测试光信号；The optical line terminal receives a second test optical signal returned after the first test optical signal is transmitted through the data channel to be tested;所述光线路终端根据所述第二测试光信号，获得所述待测数据通道的测试曲线。The optical line terminal obtains a test curve of the data channel to be tested according to the second test optical signal.14.根据权利要求13所述的方法，其特征在于，所述光线路终端向待测数据通道发送第一测试光信号之前，还包括：14. The method according to claim 13, wherein before the optical line terminal sends the first test optical signal to the data channel to be tested, further comprising:所述光线路终端接收测试控制指令或者满足测试触发条件；The optical line terminal receives a test control instruction or meets a test trigger condition;启动向所述待测数据通道发送所述第一测试光信号，并启动接收所述第二测试光信号。Start sending the first test optical signal to the data channel to be tested, and start receiving the second test optical signal.15.根据权利要求13或14所述的方法，其特征在于，所述光线路终端向待测数据通道发送第一测试光信号之前，还包括：15. The method according to claim 13 or 14, wherein before the optical line terminal sends the first test optical signal to the data channel to be tested, further comprising:停止向所述待测数据通道之外的其他数据通道发送下行信号；或者，停止向所述待测数据通道以及其他数据通道发送下行信号。Stop sending downlink signals to other data channels other than the data channel to be tested; or stop sending downlink signals to the data channel to be tested and other data channels.

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