CN1874197A - Wavelength division multiplex method of optical fiber access for XDSL signal in multiplepath - Google Patents
Wavelength division multiplex method of optical fiber access for XDSL signal in multiplepathDownload PDFInfo
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- CN1874197A CN1874197ACNA2006100816481ACN200610081648ACN1874197ACN 1874197 ACN1874197 ACN 1874197ACN A2006100816481 ACNA2006100816481 ACN A2006100816481ACN 200610081648 ACN200610081648 ACN 200610081648ACN 1874197 ACN1874197 ACN 1874197A
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Abstract
Description
Technical field:
The present invention relates to network access system, particularly use light WDM technology to insert the application of Fiber Access System of the XDSL signal of multichannel.
Background technology:
Broadband access system is used because the demand of multiple business such as video traffic requires user bandwidth to reach more than tens; But along with the increase that inserts distance, XDSL inserts data rate and will reduce greatly, and this can not satisfy user's needs far away.Simultaneously, because optical fiber has huge bandwidth for transmission ability, so we consider with the optical fiber XDSL twisted pair system of upgrading.
Because XDSL has more perfect access control protocol (as agreements such as ADSL, VDSL) and a large amount of users, so in the long distance of consideration, when high data rate inserts multi-user's scheme, its optical fiber approach preferably can intactly be used the original agreement of XDSL; So we find a kind of method, use multicarrier that multiple signals are modulated into the signal of unlike signal frequency, reach the purpose of single fiber transmission multichannel XDSL signal; Simultaneously, if further adopt the multi-wavelength multiplex technology, promptly behind Optical Fiber Transmission multi-wavelength signals, this more will improve greatly and insert the XDSL number of users.
But the transmission problem that solves the multichannel carrier signal also is complicated.
At first, need to solve carrier synchronization demodulation problem.The sync carrier oscillator signal that all needs its corresponding frequencies during the modulation signal of each carrier frequency of receiving terminal demodulation, yet want synchronously to transmit each frequency carrier oscillator signal circuit with more complicated simultaneously, therefore, need to seek a kind of better sync carrier oscillator signal transmission method.
Secondly, when multicarrier is modulated access to multiple signals, need set identical parameter or agreement at transmitting-receiving two-end, if there is not proprietary management channels, the connection of its receiving-transmitting chain also is a difficult problem.
Summary of the invention:
The present invention uses the two-dimensional parameter of wavelength and modulated carrier frequencies to insert the multiple access of distribution as the user, each user distributes an address, the unifrequent analog radio frequency reference signal of transmission in downlink optical signal comes the data of synchronous modulation and demodulation remote subscriber to send and receive simultaneously; The present invention uses the outer data message of signal specific transmission channel transport tape, helps realizing inserting the control link and the information interaction of terminal device more;
The present invention uses the active distributing equipment of far-end, realizes that the remote subscriber of multichannel XDSL signal inserts;
The present invention uses wavelength division multiplexer and light passive splitter to realize that the remote subscriber of multichannel XDSL signal inserts; The user of same wavelength receives the carrier (boc) modulated signals of downlink broadcast, and up transmission adopts the carrier wave that distributes to modulate the XDSL signal, realizes user's multiple access.
Description of drawings:
As Fig. 1 is that many XDSL user wavelength division multiplexing optical fiber connecting system is used connection layout.
The central apparatus end of the multichannel XDSL optical fiber access of wavelength division multiplexing is formed inunit 1, unit 2, unit 3 etc.;Unit 1 is an access system unit, and its is being converted to the XDSL signal from user data of uplink network, and to be the XDSL conversion of signals that inserts direction from optical fiber that data-signal is up converge output for its; Unit 2 is the multi-wavelength converting unit, and it divides into groups the XDSL of multichannel, and every group is modulated to same wavelength with different carrier, forms multiple wavelength optical signal and inserts direction to optical user and send; Simultaneously, unit 2 receives from the multi-wavelength signals that inserts direction, isolates a plurality of independent XDSL signals; Unit 3 is channel-splitting filter (wave multiplexer) unit, and it contains the multipath light signal of a plurality of different wave lengths of downlink transfer synthetic 1 tunnel light signal of a plurality of wavelength; Simultaneously, unit 3 is the light signal that contains a plurality of wavelength from the single channel that inserts direction a plurality of wavelength optical signals outputs by wavelength separated;
The Optical Distribution Network of wavelength division multiplexing optical fiber connecting system is formed in unit 4, unit 5, unit 6 etc.; Unit 4 is channel-splitting filter (wave multiplexer) unit, and its compound end links to each other with center-side by optical fiber, and its branch port is connected with the active distribution end of light, light passive splitter, optic network user terminal (ONU) etc. respectively; Unit 5 is a light passive distribution net, and it is made up of single or multiple luminous-power distributors, and branch end is connected by optical fiber with the optical-fiber network subscriber unit; Unit 6 is the active distributing terminals of light, and it inserts multi-user XDSL signal by carrier modulation and wavelength division multiplexing, directly converges to single or multiple wavelength and sends to the center-side direction; Unit 6 is the many XDSL Signal Separation from the center-side direction that single XDSL signal of many output interfaces directly is connected with the user with cable also;
Unit 9-1 is common XDSL subscriber access termination to unit 9-p; Unit 8-1 arrives list ~ 7-2 to unit 8-L and unit 7-1, they are XDSL optical fiber access user terminal, it need be converted to the signal of telecommunication to the light signal that receives or an electrical signal conversion that sends is that light signal sends, and obtains the data service signal of corresponding access by the processing of XDSL corresponding function chip;
As Fig. 2 is the center-side unit. it uses multicarrier and multi-wavelength to realize that the XDSL of multichannel distributes and multiple connection, realizes that the optical fiber of many XDSL signal inserts; Wherein,unit 21 is the input and output filter unit, and it isolates downstream bands and upstream band to the XDSL full range band signal on each road, modulates input or demodulation output when being beneficial to the up-downgoing transmission of optical fiber respectively;Unit 22 is a modem module, and all XDSL signals are modulated in this unit and are radio-frequency carrier signal, and the carrier signal of all receptions is demodulated into the XDSL signal;Unit 23 is a mixed cell, and it is mixed into 1 road signal of telecommunication to a plurality of carrier signals of same wave long-channel signal relevant with other, exports the multichannel mixed signal of a plurality of wavelength channels;Unit 24 is a photoelectric conversion unit, and it is converted to multipath light signal to the multichannel mixed signal and sends, and the multi-wavelength signals that receives is output as the multichannel mixed signal; Unit 25 is many XDSL access control unit, and management and control data that it is responsible for producing many XDSL of management access procedure transmit by the out-band channel different with the XDSL carrier frequency (signal specific transmission channel) these data between far-end and center-side; Unit 26 is the reference carrier signal unit, and it produces unifrequency carrier reference signal, and it becomes this signal allocation multichannel to offer each wavelength channel, makes each wavelength channel can both send reference signal downwards;Unit 31 is wave multiplexer/channel-splitting filter unit, it contains the light signal of a plurality of wavelength to the multipath light signal of a plurality of different wave lengths of downlink transfer (as: λ 1～λ m) synthetic 1 tunnel, is the light signal that contains a plurality of wavelength from the single channel that inserts direction (as: λ ' 1～λ ' m) a plurality of wavelength optical signals outputs by wavelength separated simultaneously;
As Fig. 3 is the center-side unit. it uses multicarrier and multi-wavelength to realize that the XDSL of multichannel distributes and multiple connection, realizes that the optical fiber of many XDSL signal inserts; Wherein, unit 20-1 is the access converting unit of each wavelength channel to unit 20-m, and distribution and multiple connection that it realizes many XDSL of same wavelength respectively realize many XDSL carrier modulation and demodulation; Unit 25 is many XDSL access control unit, and management and control data that it is responsible for producing many XDSL of management access procedure transmit by the out-band channel different with the XDSL carrier frequency (signal specific transmission channel) these data between far-end and center-side; Unit 26 is the reference carrier signal unit, and it produces unifrequency carrier reference signal, and it becomes this signal allocation multichannel to offer each wavelength channel, makes each wavelength channel can both send reference signal downwards;Unit 31 is wave multiplexer/channel-splitting filter unit, it contains the light signal of a plurality of wavelength to the multipath light signal of a plurality of different wave lengths of downlink transfer (as:λ 1～λ m) synthetic 1 tunnel, is the light signal that contains a plurality of wavelength from the single channel that inserts direction (as: λ ' 1～λ ' m) a plurality of wavelength optical signals outputs by wavelength separated simultaneously;
XDSL signal transmission converting unit as single wavelength channel of Fig. 4 center-side equipment.It uses multicarrier to realize that the XDSL of multichannel distributes and multiple connection, realizes that the optical fiber of many XDSL signal inserts; Wherein,unit 201 is the input and output filter unit, and it isolates downstream bands and upstream band to the XDSL full range band signal on each road, modulates input or demodulation output when being beneficial to the up-downgoing transmission of optical fiber respectively;Unit 202 is a modem module, and all XDSL signals are modulated in this unit and are radio-frequency carrier signal, and the carrier signal of all receptions is demodulated into the XDSL signal;Unit 203 is a mixed cell, and it is mixed into 1 road signal of telecommunication to a plurality of carrier signals of this wavelength channel signal relevant with other, exports the single channel mixed signal of this wavelength channel;Unit 204 is a photoelectric conversion unit, and it is converted to corresponding single wavelength light signal to 1 tunnel mixed signal and sends, and this channel wavelength signal that receives is output as mixed signal; Unit 251 is many XDSL access control unit, and management and control data that it is responsible for producing many XDSL of management access procedure transmit by the out-band channel different with the XDSL carrier frequency (signal specific transmission channel) these data between far-end and center-side;Unit 261 is the reference carrier signal unit, and it offers this wavelength channel to unifrequent carrier reference signal, makes it send reference signal downwards;
As Fig. 5 is the XDSL signal transmission converting unit of single wavelength channel of center-side equipment.Unit 2021 is the analog-modulated unit, the analog signal of a plurality of inputs (XDSL1, XDSL2 ..., XDSLn) carrier signal that will be modulated into different frequency is exported to 203 circuit units;Unit 261 is a reference signal unit, and it provides unifrequent carrier reference signal to make it to descending transmission to hybrid circuit, and simultaneously, it also signals toUnit 2023;Unit 2023 is for sending carrier oscillation frequency (f11, f12..., f1N) and reception carrier frequency of oscillation (f21, f22..., f2N) generation unit, its reception carrier reference signal also cooperates the transmission frequency of oscillation will produce a plurality of carrier modulation to offerunit 2021 andunit 2022 by control circuit;Unit 203 is the hybrid circuit unit, and its is mixing the compound mixed signal of output after the addition from the carrier signal of all different frequencies ofunit 2021 output to theunit 2041;Unit 2041 is light emission converting unit, and it is the electrical signal conversion of input light signal output; Control unit 251 sends interactive data information to mixedcell 203;Light receiving unit 2042 receiving optical signals are converted to the signal of telecommunication;Unit 2022 is the carrier wave demodulation unit, it receiving signal demodulation for the transmission multiple signals (XDSL1, XDSL2 ..., XDSLn) output.
Comprise transmission parts such as carrier modulation for center-side equipment as the last figure of Fig. 6, figure below is the band occupancy distribution diagram that single wavelength channel of central apparatus end sends the signal of telecommunication.Unit 2011-1 is a filter cell to unit 2011-n, multiple signals XDSL1, XDSL2,, XDSLn enters a plurality of filter cell 2011-1 ~ 2011-n respectively, and each filter cell carries out filtering difference output signal to modulator unit (2021-1 to signal, 2021-2 ..., 2021-n); The filtered analog signal of a plurality of inputs will be modulated into the carrier signal of different frequency and export to 2031 circuit units; Unit 2023-1 is for sending the carrier wave generation unit, it by control circuit cooperate the frequency of oscillation that will produce a plurality of carrier modulation (f11, f12 ..., f1n) offer a plurality of unit (2021-1,2021-2 ..., 2021-n;Unit 261 is a reference signal unit, and it provides the simple signal of reference carrier to hybrid circuit unit 2031; Unit 2031 is the hybrid circuit unit, it mixes addition to the carrier signal of all different frequencies of 2021 outputs from the unit with control and management passage (signal specific transmission channel) signal etc. that reference carrier signal and many XDSL access control unit 6211 produce, and exports compound mixed multiplex carrier signal then;Unit 2041 is light emission converting unit, and it is converted to light signal to mixed signal and sends.
Fig. 6 figure below sends the band occupancy distribution diagram of the signal of telecommunication for the central apparatus end; The carrier (boc) modulated signals of each input signal takies different frequency bands respectively, and from the high-end downward arrangement of frequency band, the single-frequency carrier signal of benchmark is lower than all signal carrier frequency ranges; (signal specific transmission channel) frequency band that the control and management data occupancy is minimum.
Be the active distributing equipment carrier modulation of far-end and send part as the last figure of Fig. 7, figure below is the band occupancy distribution diagram that the active distributing equipment list of far-end wavelength channel sends the signal of telecommunication. unit 6011-1 is a filter cell to unit 6011-n, multiple signals XDSL1, XDSL2 ..., XDSLn enters a plurality of filter cell 6011-1 ~ 6011-n respectively, each filter cell carries out filtering difference output signal to modulator unit (6021-1 to signal, 6021-2 ..., 6021-n); The filtered analog signal of a plurality of inputs will be modulated into the carrier signal of different frequency and export to 6031 circuit units; Unit 6023-1 is for sending the carrier wave generation unit, it by control circuit cooperate the frequency of oscillation that will produce a plurality of carrier modulation (f11, f12 ..., f1n) offer a plurality of unit (6021-1,6021-2 ..., 6021-n; Unit 6031 is the hybrid circuit unit, it mixes addition to the carrier signal of all different frequencies of 6021 outputs from the unit with control and management passage (signal specific transmission channel) signal etc. that many XDSL access control unit 6211 produces, and exports compound mixed multiplex carrier signal then; Unit 6041 is light emission converting unit, and it is converted to light signal to mixed signal and sends.
As Fig. 7 figure below is the band occupancy distribution diagram that the active distributing equipment list of far-end wavelength channel sends the signal of telecommunication; The carrier (boc) modulated signals of each input signal takies different frequency bands respectively, from the high-end downward arrangement of frequency band; (signal specific transmission channel) frequency band that the control and management data occupancy is minimum.
Insert connection layout and carrier wave electricity spectrum allocation may schematic diagram as Fig. 8 for the light passive network remote subscriber.
Unit 41 is wave multiplexer/channel-splitting filter unit, and it has at least 1 tunnel partial wave long port to be connected with light passive distribution unit 51; Unit 51 is the luminous power allocation units, and it is made up of one or more light distribution devices; Unit 8-1 is optical-fiber network user access unit (ONU) to unit 8-L, and the multi-carrier signal that it receives single wavelength only extracts control signal fT, reference signal f0Certain carrier (boc) modulated signals with its correspondence; Unit 8-1 puts into corresponding carrier signal f to upstream data1In, the data-signal of the access-in management of non-XDSL is put into control signal passage (signal specific transmission channel) fTIn, mix forming upwards transmission of light signal; Each light subscriber unit sends different carrier signal (f1, f2..., fL), pool the light signal that has multicarrier simultaneously through light allocation units 51; Up fTFor sharing frequency band, each optical-fiber network subscriber unit (ONU) takies timesharing.
Embodiment:
(1) center-side equipment execution mode:
Multichannel XDSL signal is divided into many groups, and every group is used 1 wavelength channel;
In each wavelength channel,, the multichannel input signal more than 1 is modulated to the radio-frequency carrier signal of different frequency respectively at transmitting terminal; Light sends in the signal and includes reference signal, and this reference signal is used for producing a plurality of carrier oscillation signals at the remote equipment optical receiving end, uses a plurality of carrier oscillation signals that the multicarrier of the signal modulation of transmission is carried out synchronous demodulation; The light transmitting terminal is converted to light signal output containing all different frequency multichannel carrier modulation signals with the superposed signal that contains the mixing of reference signal; Reference signal and interactive data information transmission frequency have taken the low frequency end of transmission band, and the carrier transmission frequency of multi-carrier modulation has taken the high-end of transmission band.
Each wavelength channel optical receiving end received RF mixed light signal is converted to the mixing signal of telecommunication; Optical receiving end uses the radio demodulating circuit according to mixing the signal of telecommunication, the multiple signals before the modulation of output far-end; In the light signal between center-side and the far-end, have the interactive data information passage (signal specific transmission channel) that does not contain multiway transmission signal, center-side equipment can send information to remote equipment.
Use wave multiplexer/channel-splitting filter that a plurality of wavelength channels are combined into an optical fiber transport channel transmission.
(2) the active distributing equipment execution mode of light:
Use wave multiplexer/channel-splitting filter to isolate wavelength signals separately to the active distributing equipment of multi-wavelength, each wavelength channel is carried out processing of circuit respectively;
The active distributing equipment list of light wavelength channel, at the light transmitting terminal, the signal that comprises the carrier frequency synchronization recovering information that receives according to far-end produces a plurality of different rf frequency signals; Utilize these rf frequency signals, the multichannel input signal more than 1 is modulated to the radio-frequency carrier signal of different frequency respectively; At the light transmitting terminal, the mixed signal that contains all different frequency carrier signal stacks is carried out opto-electronic conversion, the optical transmission signal of output rf frequency;
The active distributing equipment list of light wavelength channel at optical receiving end, receives the light signal from center-side, is the mixing signal of telecommunication through opto-electronic conversion; The optical receiving end of far-end extracts the reference signal of mixing in the signal of telecommunication; At optical receiving end, according to the reference signal that reception comprises, produce the multichannel sync carrier oscillator signal that local demodulation needs, respectively the modulated carrier that transmits is carried out demodulation then, the transmission signals before the modulation of output respective radio-frequency; In the light signal between active distributing equipment of far-end and the center-side equipment, have the interactive data information passage (signal specific transmission channel) that does not contain multiway transmission signal, the active distributing equipment of far-end can send information to central apparatus.
(3) optical-fiber network subscriber unit (ONU/ONT) execution mode:
Use the information interaction control channel of the transmission channel (signal specific transmission channel) of non-XDSL, transmit and consult corresponding passage Control Parameter as center-side and user;
At the light transmitting terminal,, generate the concussion frequency signal of modulated carrier according to far-end reference carrier signal that receives and the parameter that inserts subscriber unit; Utilize this concussion frequency signal, user's XDSL signal is modulated to radio-frequency carrier signal; At the light transmitting terminal, the mixed signal after the radio-frequency carrier signal of modulation and the stack of control channel signal is carried out opto-electronic conversion, the optical transmission signal of output rf frequency;
At optical receiving end, receive light signal from center-side, be the mixing signal of telecommunication through opto-electronic conversion; Parameter according to reference carrier signal that receives and access subscriber unit generates the sync carrier oscillator signal that local demodulation needs, and the modulated carrier to transmission carries out demodulation then, the preceding XDSL transmission signals of output respective radio-frequency modulation;
The tandem of frequency band up and down of XDSL signal is become single XDSL composite signal, use user's processing procedure of XDSL terminal in the past, obtain the final access service data of user.
Claims (18)
1. in the wavelength division multiplexing optical fiber connecting system, the optical fiber cut-in method that many XDSL user inserts, concrete grammar is:
(1) two-dimensional parameter of use wavelength and modulated carrier frequencies inserts the multiple access of distribution as the user, each user distributes an address: at first, in 1 single wavelength, 1 XDSL signal is modulated to carrier (boc) modulated signals by unique rf frequency signal, the carrier wave of a plurality of different frequencies of carrying on single wavelength, all carrier signals are converted into optical signal transmission; Secondly, use a plurality of different wavelength to come the number of users of increase XDSL at double as another dimension;
(2) have 1 tunnel unifrequent analog radio-frequency signal at least in the downlink optical signal transmission, it as the reference signal that inserts far-end, is used for the transmission carrier modulation frequency of synchronous far-end, be used for the sync carrier demodulation of far-end received signal; This reference signal is the signal beyond the XDSL, and its frequency is not overlapping with the XDSL carrier frequency yet.
2. in the claim 1, can be described as more specifically:
(1) center-side is when far-end sends the XDSL signal, at least 1 XDSL signal of each wavelength transmission:
(a) use the different radio frequency carrier wave correspondingly XDSL to be modulated the carrier signal of a plurality of different frequencies of formation;
The mixed signal that includes above-mentioned a plurality of different carriers is carried out the electric light conversion, the output light modulating signal;
(b) above-mentioned a plurality of wavelength optical signals of having modulated the XDSL signal is compound through wavelength division multiplexer, the light signal that compound output sends to far-end;
(c) in the composite optical signal of above-mentioned transmission, the carrier signal that comprises a benchmark at least is modulated onto in one or more optical wavelength signal, as the reference signal of far-end reception;
(2) far-end is when center-side sends the XDSL signal, and XDSL modulates with radio-frequency carrier signal, and modulation signal is converted to light signal and sends to center-side.
3. in the claim 2, further comprise: when each used different radio frequency carrier wave that XDSL is carried out one by one corresponding modulating, center-side only used the signal of the downstream bands among the XDSL to modulate to the direction of far-end transmission; Far-end only uses the signal of the upstream band among the XDSL to modulate to the direction of center-side.
4. in the claim 2, comprise further: at least one wavelength or in all wavelengths, have the signal specific transmission channel; The signal specific passage takies the frequency band different with the XDSL carrier frequency, and signal specific is mixed together with the multiple signal that comprises the XDSL carrier signal, and mixed signal is converted to the light signal of certain wavelength by electric light.
5. in the claim 4, the signal of signal specific transmission channel transmission can be specially digital signal, or for by the digital signal modulated carrier signal; The signal specific transmission channel can make and be used for transmitting XDSL such as access control supervisory signal, physical layer link information signal transmission in addition.
6. in the claim 4, the signal specific transmission channel is distributed can be specially the signal specific transmission channel that each wavelength channel distributes 1 non-XDSL data; Downlink broadcast is to all users of co-wavelength (TDM), and up signal specific transmission channel adopts co-wavelength user time-sharing transmission (TDMA).
7. in the claim 2, far-end XDSL user when center-side sends signal more specifically method be: have at least 1 active distributing equipment end of far-end; Active distributing equipment end directly connects with the XDSL holding wire to a plurality of access users; Active distribution end connects to center-side by optical fiber.
8. in the claim 2, far-end XDSL user when center-side sends signal more specifically method be: have at least 1 far-end passive optical splitter; The branch port of passive optical splitter directly inserts user's light to difference and connects, and access user terminal oneself is isolated the XDSL signaling interface; The total port of passive optical splitter connects to the center-side direction by optical fiber.
9. in claim 7, the claim 8, also have wavelength division multiplexer more specifically, the compound end of wavelength division multiplexer is connected with the optical fiber of center-side direction; The branch multiplexing port of wavelength division multiplexer and passive splitter or active remote equipment or user terminal are connected.
10. wavelength division multiplexing XDSL connecting system, its center-side equipment specifically includes:
(1) wavelength division multiplex device is used for the compound transmission of different optical wavelength and receives respectively with different optical wavelength;
(2) carrier modulation and carrier wave demodulation circuit unit are used for the XDSL signal is modulated into carrier (boc) modulated signals;
(3) photoelectric conversion unit is used for the light signal that receives is converted to the signal of telecommunication, is the electrical signal conversion that sends light signal;
(4) circuit reference signal unit is used to form the carrier signal of benchmark, and as the reference signal that each road XDSL carrier wave receives, the reference carrier signal of this unit output will send to far-end;
(5) hybrid circuit unit, the XDSL transmission carrier signal that is used at least 1 tunnel is mixed into composite signal (can comprise reference carrier signal); Be used for the composite signal that receives is resolved into the one-channel signal of XDSL;
(6) filter cell is used for the XDSL signal is isolated the downstream bands signal that sends to far-end, is the upstream band conversion of signals that receives from far-end the XDSL signal of full range band simultaneously.
11. a wavelength division multiplexing XDSL connecting system, its center-side equipment specifically includes:
(1) wavelength division multiplex device is used for the compound transmission of different optical wavelength and receives respectively with different optical wavelength;
(2) at least 1 single wavelength channel unit, each single wavelength channel unit comprises:
(a) carrier modulation and carrier wave demodulation circuit unit are used for the XDSL signal is modulated into carrier (boc) modulated signals;
(b) photoelectric conversion unit is used for the light signal that receives is converted to the signal of telecommunication, is the electrical signal conversion that sends light signal;
(c) hybrid circuit unit, the XDSL transmission carrier signal that is used at least 1 tunnel is mixed into composite signal (also can comprise other transmission signals); Be used for the composite signal that receives is resolved into the one-channel signal etc. of XDSL;
(d) filter cell is used for the XDSL signal is isolated the downstream bands signal that sends to far-end, simultaneously from
The upstream band conversion of signals that far-end receives is the XDSL signal of full range band;
(3) circuit reference signal unit, be used to form the unifrequency carrier signal of benchmark, reference signal when receiving as each road XDSL carrier wave, the hybrid circuit unit that the benchmark unifrequency carrier signal of this unit output can be sent into above-mentioned single wavelength channel unit sends to far-end.
12. claim 10 or claim 11, its center-side equipment also further includes signal specific and sends receiving element, this unit is used to send or receive XDSL such as optical fiber access control supervisory signal, physical layer link information signal in addition, can realize the information interaction of center-side and far-end by this unit interface.
13. a wavelength division multiplexing XDSL connecting system, the active distributing equipment of its far-end specifically includes:
(1) benchmark unifrequency carrier signal receiving circuit unit is used for the benchmark unifrequency carrier signal that the receiving center end sends;
(2) carrier modulation and carrier wave demodulation circuit unit are used for the XDSL signal that sends is modulated into carrier (boc) modulated signals; Be used for the carrier (boc) modulated signals that receives is demodulated into the XDSL signal;
(3) photoelectric conversion unit is used for the light signal that receives is converted to the signal of telecommunication, is the electrical signal conversion that sends light signal;
(4) hybrid circuit unit, the XDSL transmission carrier signal that is used at least 1 tunnel is mixed into composite signal (can comprise reference carrier signal); Be used for the composite signal that receives is resolved into the one-channel signal of XDSL;
(5) there is a plurality of twisted-pair feeder XDSL subscriber connection mouths in the many interface units of XDSL.
14. claim 13, its equipment also can further comprise: have a plurality of external up optical interfaces, this up optical interface externally is connected with the optical fiber of center-side equipment side direction, this up optical interface is connected with a channel unit of the single wavelength channel in a plurality of inside respectively at device interior, the wavelength channel unit can independence or collaborative work, makes each wavelength channel unit all can insert at least 1 XDSL user.
15. claim 13, its equipment also can further comprise: have at least 1 external descending optical interface, this descending optical interface externally is connected with the optical fiber of user side direction.
16. claim 13, its equipment also can further comprise: there is a composite wavelength interface in equipment, and this composite wavelength interface can transmit the multi-wavelength mixed light signal of at least 2 wavelength; There is wavelength division multiplex device in device interior, and the composite wavelength interface of the compound port corresponding device of its device, this device are used for the composite wavelength passage is divided into a plurality of single wavelength channels, and the unit of each single wavelength channel all can insert at least 1 XDSL user.
17. claim 13, its equipment also can further comprise the Transmit-Receive Unit of signal specific transmission channel, this Transmit-Receive Unit is isolated the signal of signal specific transmission channel on the one hand from the signal from the wavelength that includes the signal specific transmission channel of center-side, on the other hand, the signal that needs the signal specific channel transfer is joined in the transmission wavelength, the signal of its signal specific transmission channel transmission can be the incoming control signal of center-side and active distributing equipment end, other signal that also can right and wrong XDSL.
18. a wavelength division multiplexing XDSL connecting system, its optical fiber insert user side (ONU/ONT) and specifically include:
(1) benchmark unifrequency carrier signal receiving circuit unit be used for the benchmark unifrequency carrier signal that the receiving center end sends, and this reference signal is not the intrinsic inband signaling of XDSL itself;
(2) carrier modulation and carrier wave demodulation circuit unit are used for that XDSL is sent signal and are modulated into carrier (boc) modulated signals; This unit is demodulated into 1 road XDSL signal to the carrier (boc) modulated signals that receives by the carrier reference signal that receives;
(3) filter unit is combined into XDSL full frequency band signal to the XDSL downstream bands that receives from light path; Be used for sending signal isolating upstream band in the XDSL full range band signal to center-side;
(4) photoelectric conversion unit is used for the light signal that receives is converted to the signal of telecommunication, is the electrical signal conversion that sends light signal;
(5) XDSL inserts processing unit, is the XDSL conversion of signals that receives corresponding customer service signal (as: Ethernet data or speech data etc.), is the customer service conversion of signals XDSL signal.
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| CNA2006100816481ACN1874197A (en) | 2006-05-08 | 2006-05-08 | Wavelength division multiplex method of optical fiber access for XDSL signal in multiplepath |
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| CN101114885B (en)* | 2007-09-05 | 2011-07-27 | 华中科技大学 | Wavelength-division and time division multiplex mixing passive optical network system, terminal and signal transmission method |
| CN115225151A (en)* | 2022-07-18 | 2022-10-21 | 中国电子科技集团公司第五十四研究所 | Method for realizing time-frequency-number integrated transmission by using single optical fiber and single wavelength |
| CN116405809A (en)* | 2023-03-27 | 2023-07-07 | 武汉匾福光电科技有限责任公司 | A low-latency multi-channel signal simultaneous detection and aggregation method and device |
| CN117556246A (en)* | 2024-01-09 | 2024-02-13 | 电信科学技术第五研究所有限公司 | Method for separating single wave signal from carrier mixed signal |
- 2006
- 2006-05-08CNCNA2006100816481Apatent/CN1874197A/enactivePending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101114885B (en)* | 2007-09-05 | 2011-07-27 | 华中科技大学 | Wavelength-division and time division multiplex mixing passive optical network system, terminal and signal transmission method |
| CN115225151A (en)* | 2022-07-18 | 2022-10-21 | 中国电子科技集团公司第五十四研究所 | Method for realizing time-frequency-number integrated transmission by using single optical fiber and single wavelength |
| CN115225151B (en)* | 2022-07-18 | 2023-12-29 | 中国电子科技集团公司第五十四研究所 | Method for realizing time-frequency integrated transmission by single optical fiber and single wavelength |
| CN116405809A (en)* | 2023-03-27 | 2023-07-07 | 武汉匾福光电科技有限责任公司 | A low-latency multi-channel signal simultaneous detection and aggregation method and device |
| CN117556246A (en)* | 2024-01-09 | 2024-02-13 | 电信科学技术第五研究所有限公司 | Method for separating single wave signal from carrier mixed signal |
| CN117556246B (en)* | 2024-01-09 | 2024-03-19 | 电信科学技术第五研究所有限公司 | Method for separating single wave signal from carrier mixed signal |
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