CN113259007B - Cascaded optical frequency transfer device and method - Google Patents
Cascaded optical frequency transfer device and methodDownload PDFInfo
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- CN113259007B CN113259007BCN202110701941.8ACN202110701941ACN113259007BCN 113259007 BCN113259007 BCN 113259007BCN 202110701941 ACN202110701941 ACN 202110701941ACN 113259007 BCN113259007 BCN 113259007B
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Abstract
Description
Translated fromChinese技术领域technical field
本发明涉及光纤时间与频率传递，特别是一种级联的光学频率传递装置和传递方法。The invention relates to optical fiber time and frequency transmission, in particular to a cascaded optical frequency transmission device and transmission method.
背景技术Background technique
随着冷原子技术的快速发展，光学原子钟包括光离子钟和光晶格钟的得到了飞速发展，其准确度已经接近10-19量级，比现有的微波原子钟高至少一个量级以上，已经成为下一代时间频率基准的有力竞争者。目前已发展了多种时间频率传递方式，其中最广泛使用的基于卫星的天基频率传递只能实现10-15/天的频率传输稳定度。除了基于天基卫星的时间频率传递方式之外，基于光纤链路光学频率传输技术被多次证明是突破现有技术限制、实现长距离传递一种有效解决方案。但是长距离的传递受到光纤时延的限制，会限制系统的补偿带通，导致较差的相位噪声补偿效果。针对以上问题，法国在2015年提出一种中继放大的方案，即在中继站中将一台激光器锁定到该信号光上，以此产生出一个新的传输光分别往上一级和继续向下一级链路传输，实现信号的前后两条链路信号光的放大[N.Chiodo,N.Quintin,F.Stefani,F.Wiotte,E.Camisard,C.Chardonnet,G.Santarelli,A.Amy-Klein,P.E.Pottie,and O.Lopez,Cascaded optical fiber link using the internetnetwork for remote clocks comparison.Optics express,23(26),pp.33927-33937,2015]。通过这种方式可以很好的解决控制带宽和链路容易受干扰的问题。然而，该方案中继站和前后链路都需要相位锁定模块，而这容易导致系统的可靠性下降。With the rapid development of cold atom technology, optical atomic clocks, including optical ion clocks and opticallattice clocks, have developed rapidly. Become a serious contender for the next generation of time-frequency benchmarks. At present, a variety of time-frequency transfer methods have been developed, among which the most widely used satellite-based space-based frequency transfer can only achieve a frequency transmission stability of10-15 /day. In addition to the time and frequency transmission method based on space-based satellites, the optical frequency transmission technology based on optical fiber link has been proved many times to be an effective solution to break through the limitations of existing technology and realize long-distance transmission. However, the long-distance transmission is limited by the time delay of the fiber, which will limit the compensation bandpass of the system, resulting in a poor phase noise compensation effect. In response to the above problems, France proposed a relay amplification scheme in 2015, that is, a laser is locked to the signal light in the relay station, so as to generate a new transmission light to go up and down respectively. The first-level link transmission realizes the amplification of the signal light of the two links before and after the signal [N.Chiodo,N.Quintin,F.Stefani,F.Wiotte,E.Camisard,C.Chardonnet,G.Santarelli,A.Amy - Klein, PE Pottie, and O. Lopez, Cascaded optical fiber link using the internetnetwork for remote clocks comparison. Optics express, 23(26), pp. 33927-33937, 2015]. In this way, the problems of control bandwidth and link susceptible to interference can be well solved. However, both the relay station and the front and rear links in this scheme require phase locking modules, which easily leads to a decrease in the reliability of the system.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于克服上述现有技术的不足，提供一种级联的光学频率传递装置和传递方法。本发明级联站同时获取第一光纤链路和第二光纤链路引入的相位噪声，并通过级联站相位补偿单元同时补偿第一光纤链路和第二光纤链路引入的相位噪声，使得用户端获得相位稳定的光学频率信号，实现了级联的光学频率传递。本发明通过在级联光纤链路可有效提高相位补偿带宽，有效地降低了系统噪底，此外还具有系统结构简单、可靠性高的特点。The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a cascaded optical frequency transmission device and transmission method. The cascade station of the present invention simultaneously acquires the phase noise introduced by the first optical fiber link and the second optical fiber link, and simultaneously compensates the phase noise introduced by the first optical fiber link and the second optical fiber link through the phase compensation unit of the cascade station, so that The user terminal obtains a phase-stable optical frequency signal, which realizes cascaded optical frequency transmission. The invention can effectively improve the phase compensation bandwidth by cascading optical fiber links, effectively reduce the noise floor of the system, and also has the characteristics of simple system structure and high reliability.
本发明的技术解决方案如下：The technical solution of the present invention is as follows:
一种级联的光学频率传递装置，其特点在于，包括本地端、第一光纤链路、级联站、第二光纤链路和用户端；A cascaded optical frequency transmission device is characterized in that it includes a local end, a first optical fiber link, a cascade station, a second optical fiber link and a user end;
所述的本地端由第一Y型光耦合器、第一声光移频器、第一射频源和第一法拉第旋转镜组成，所述的第一Y型光耦合器的1端口、2端口、3端口分别与所述的第一声光移频器的第1光学端口、待传递的光学频率输入口、所述的第一法拉第旋转镜相连，所述的第一声光移频器的第2光学端口、射频接口分别与所述的第一光纤链路的1端口、所述的第一射频源的输出端相连；The local end is composed of a first Y-type optical coupler, a first acousto-optic frequency shifter, a first radio frequency source and a first Faraday rotating mirror. Ports 1 and 2 of the first Y-type optical coupler are and 3 ports are respectively connected with the first optical port of the first acousto-optic frequency shifter, the optical frequency input port to be transmitted, and the first Faraday rotating mirror. The second optical port and the radio frequency interface are respectively connected to the first port of the first optical fiber link and the output end of the first radio frequency source;
所述的级联站由第二声光移频器、第二法拉第旋转镜、X型光耦合器、光电转换单元、第一射频带通滤波器、第二射频带通滤波器、射频混频器、第三射频带通滤波器、第二射频源、伺服控制器、压控振荡器、第三声光移频器和第三射频源组成，所述的第二声光移频器的第1、2光学端口分别与所述的第一光纤链路的2端口、所述的X型光耦合器的第1端口相连，所述的X型光耦合器的第2、3、4端口分别与所述的光电转换单元的光学端口、所述的第二法拉第旋转镜、所述的第三声光移频器的第1光学端口相连，所述的光电转换单元的输出端分别与所述的第一射频带通滤波器的输入端和所述的第二射频带通滤波器的输入端相连，所述的射频混频器的第1、2输入端和输出端分别与所述的第一射频带通滤波器的输入端、所述的第二射频带通滤波器的输入端、所述的第三射频带通滤波器的输入端相连，所述的第三射频带通滤波器的输出端与所述的伺服控制器的第1射频输入端口相连，所述的第二射频源的输出端与所述的伺服控制器的第2射频输入端相连，所述的伺服控制器的输出端与所述的压控振荡器的输入端相连，所述的压控振荡器的输出端与第二声光移频器的射频接口相连，所述的第三声光移频器的第2光学端口、射频接口分别与所述的第二光纤链路的1端口、所述的第三射频源的射频口相连；The cascade station is composed of a second acousto-optic frequency shifter, a second Faraday rotating mirror, an X-type optical coupler, a photoelectric conversion unit, a first radio frequency bandpass filter, a second radio frequency bandpass filter, and radio frequency mixing. It consists of a device, a third radio frequency bandpass filter, a second radio frequency source, a servo controller, a voltage controlled oscillator, a third acousto-optic frequency shifter and a third radio frequency source. 1 and 2 optical ports are respectively connected with the 2 ports of the first optical fiber link and the first port of the X-type optical coupler, and the second, third, and fourth ports of the X-type optical coupler are respectively It is connected with the optical port of the photoelectric conversion unit, the second Faraday rotating mirror, and the first optical port of the third acousto-optic frequency shifter, and the output ends of the photoelectric conversion unit are respectively connected with the The input end of the first radio frequency bandpass filter is connected to the input end of the second radio frequency bandpass filter, and the first and second input ends and output ends of the radio frequency mixer are respectively connected with the The input end of a radio frequency bandpass filter, the input end of the second radio frequency bandpass filter, and the input end of the third radio frequency bandpass filter are connected, and the third radio frequency bandpass filter The output end is connected to the first radio frequency input port of the servo controller, the output end of the second radio frequency source is connected to the second radio frequency input end of the servo controller, and the output end of the servo controller The terminal is connected to the input terminal of the voltage-controlled oscillator, the output terminal of the voltage-controlled oscillator is connected to the radio frequency interface of the second acousto-optic frequency shifter, and the second acousto-optic frequency shifter of the third The optical port and the radio frequency interface are respectively connected with port 1 of the second optical fiber link and the radio frequency port of the third radio frequency source;
所述的用户端由第四声光移频器、第二Y型光耦合器、第三法拉第旋转镜和第四射频源组成，所述的第四声光移频器的第1、2光学端口、射频端口分别与所述的第二光纤链路的2端口、所述的第二Y型光耦合器的1端口、所述的第四射频源的射频口相连，所述的第二Y型光耦合器的2、3端口分别与所述的第三法拉第旋转镜、用户端输入接口相连。The user terminal is composed of a fourth acousto-optic frequency shifter, a second Y-type optical coupler, a third Faraday rotating mirror and a fourth radio frequency source. The first and second optical elements of the fourth acousto-optic frequency shifter are The port and the radio frequency port are respectively connected to port 2 of the second optical fiber link, port 1 of the second Y-type optical coupler, and radio frequency port of the fourth radio frequency source. Ports 2 and 3 of the optical coupler are respectively connected with the third Faraday rotating mirror and the user terminal input interface.
所述的第一光纤链路和第二光纤链路由光纤、双向光放大器组成。The first optical fiber link and the second optical fiber link are composed of optical fibers and bidirectional optical amplifiers.
利用上述级联的光学频率传递装置的光学频率传递方法，该方法具体步骤如下：Using the optical frequency transmission method of the above-mentioned cascaded optical frequency transmission devices, the specific steps of the method are as follows:
1)本地端待传递的光学频率信号E0＝cos[vt]经过所述的第一Y型光耦合器后在所述的第一法拉第旋转镜和所述的第二法拉第旋转镜之间多次反射，多次反射之后达到所述的光电转换单元上的光学频率信号为：1) After the optical frequency signal E0 =cos[vt] to be transmitted at the local end passes through the first Y-type optical coupler, there is a large amount between the first Faraday rotating mirror and the second Faraday rotating mirror. The optical frequency signal reaching the photoelectric conversion unit after multiple reflections is:
式中，n为光学频率信号在所述的第一光纤链路中反射的次数，wl和ωm分别为所述的第一声光移频器的射频工作频率和所述的第二声光移频器的射频工作频率，φp1为在所述的第一光纤链路中单向传输引入的相位噪声，φc为补偿相位；In the formula, n is the number of times the optical frequency signal is reflected in the first optical fiber link, wl and ωm are the radio frequency operating frequency of the first acousto-optic frequency shifter and the second acoustic frequency respectively. the radio frequency operating frequency of the optical frequency shifter, φp1 is the phase noise introduced by the unidirectional transmission in the first optical fiber link, and φc is the compensation phase;
2)所述的E1经过所述的第一X型光耦合器、所述的第三声光移频器和所述的第二光纤链路后，所述的第四声光移频器、所述的用户端接收到信号可表示为：2) After the E1 passes through the first X-type optical coupler, the third acousto-optic frequency shifter and the second optical fiber link, the fourth acousto-optic frequency shifter , the signal received by the user terminal can be expressed as:
Er∝cos[v+(ωs+ωr+ωl+ωm)t+(φp1+φp2+φc)]Er ∝cos[v+(ωs +ωr +ωl +ωm )t+(φp1 +φp2 +φc )]
式中，ωs和ωr分别为所述的第三声光移频器和所述的第四声光移频器的射频工作频率，φp2为在所述的第二光纤链路中单向传输引入的相位噪声；In the formula, ωs and ωr are the radio frequency operating frequencies of the third acousto-optic frequency shifter and the fourth acousto-optic frequency shifter, respectively, and φp2 is the single frequency in the second fiber link. Phase noise introduced into the transmission;
3)所述的Er再次经过所述的第二Y型光耦合器、所述的第四声光移频器、第二光纤链路、第三声光移频器、第一X型光耦合器进入所述的光电转换单元，进入所述的光电转换单元的信号可表示为：3) The Er passes through the second Y-type optical coupler, the fourth acousto-optic frequency shifter, the second optical fiber link, the third acousto-optic frequency shifter, and the first X-type light The coupler enters the photoelectric conversion unit, and the signal entering the photoelectric conversion unit can be expressed as:
4)所述的E1和E2经过所述的光电转换单元拍频后，获得：4) After described E1 and E2 pass through described photoelectric conversion unit beat frequency, obtain:
5)所述的E3经过中心频率为2(ωs+ωr)和2(ωl+ωm)的所述的第一射频带通滤波器和所述的第二射频带通滤波器滤出的信号分别为：5) The E3 passes through the first radio frequency bandpass filter and the second radio frequency bandpass filter whose center frequencies are 2(ωs +ωr ) and 2(ωl +ωm ) The filtered signals are:
E4∝cos[2(ωs+ωr)t+2φp2]，E5∝cos[2(ωl+ωm)t+2(φp1+φc)]；E4 ∝cos[2(ωs +ωr )t+2φp2 ], E5 ∝cos[2(ωl +ωm )t+2(φp1 +φc )];
6)所述的E4和E5经过所述的射频混频器后，通过所述的第三射频带通滤波器后取出上边带信号：6) After the described E4 and E5 pass through the described radio frequency mixer, take out the upper sideband signal after passing through the third described radio frequency bandpass filter:
E6∝cos[2(ωs+ωr+ωl+ωm)t+2(φp1+φp2+φc)]；E6 ∝cos[2(ωs +ωr +ωl +ωm )t+2(φp1 +φp2 +φc )];
7)所述的伺服控制器将所述的E6与所述的第二射频源输出的频率2(ωs+ωr+ωl+ωm)进行比较，获得E6的相位噪声，并采用伺服控制算法使得：7) The servo controller compares theE6 with the frequency 2 (ωs +ωr +ω1+ωm) output by the second radio frequency source to obtain the phase noise ofE6 , and The servo control algorithm is used to make:
φc＝-(φp1+φp2)；φc =-(φp1 +φp2 );
8)将上式代入Er，用户端接收到的频率可表示为：8) Substituting the above formula into Er , the frequency received by the user terminal can be expressed as:
Er′∝cos[v+(ωs+ωr+ωl+ωm)t]；Er′ ∝cos[v+(ωs +ωr +ωl +ωm )t];
补偿了第一光纤链路和第二光纤链路引入的相位噪声。The phase noise introduced by the first fiber link and the second fiber link is compensated.
本发明的工作原理是：在级联站同时获取第一光纤链路和第二光纤链路引入的相位噪声，并通过级联站相位补偿单元同时补偿第一光纤链路和第二光纤链路引入的相位噪声，使得用户端获得相位稳定的光学频率信号，实现了级联的光学频率传递。The working principle of the present invention is as follows: the phase noise introduced by the first optical fiber link and the second optical fiber link is simultaneously acquired at the cascade station, and the first optical fiber link and the second optical fiber link are simultaneously compensated by the phase compensation unit of the cascade station. The introduced phase noise enables the user end to obtain a phase-stable optical frequency signal and realizes cascaded optical frequency transmission.
本发明的技术效果如下：The technical effect of the present invention is as follows:
本发明通过在级联光纤链路可有效提高相位补偿带宽，有效地降低了系统噪底，此外还具有系统结构简单、可靠性高的特点The invention can effectively improve the phase compensation bandwidth by cascading optical fiber links, effectively reduce the noise floor of the system, and also has the characteristics of simple system structure and high reliability
附图说明Description of drawings
图1是本发明级联的光学频率传递装置实施例1的结构示意图；1 is a schematic structural diagram of Embodiment 1 of the cascaded optical frequency transmission device of the present invention;
具体实施方式Detailed ways
下面结合实施例和附图对本发明作进一步说明，本实施例以本发明的技术方案为前提进行实施，给出了详细的实施方式和和具体的工作流程，但本发明的保护范围不限于下述的实施例。The present invention will be further described below in conjunction with the embodiments and the accompanying drawings. The present embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed implementation modes and specific workflows, but the protection scope of the present invention is not limited to the following described embodiment.
请参阅图1，图1是本发明级联的光学频率传递装置实施例1的结构示意图，由图可见，本发明级联的光学频率传递装置，包括本地端1、第一光纤链路2、级联站3、第二光纤链路4和用户端5；Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of Embodiment 1 of the cascaded optical frequency transmission device of the present invention. As can be seen from the figure, the cascaded optical frequency transmission device of the present invention includes a local end 1, a first optical fiber link 2, Cascading station 3, second optical fiber link 4 and user terminal 5;
所述的本地端1由第一Y型光耦合器10、第一声光移频器11、第一射频源12和第一法拉第旋转镜13组成，所述的第一Y型光耦合器10的1端口、2端口、3端口分别与所述的第一声光移频器11的第1光学端口、待传递的光学频率输入口、所述的第一法拉第旋转镜13相连，所述的第一声光移频器11的第2光学端口、射频接口分别与所述的第一光纤链路2的1端口、所述的第一射频源12的输出端相连；The local terminal 1 is composed of a first Y-type
所述的级联站3由第二声光移频器14、第二法拉第旋转镜15、X型光耦合器16、光电转换单元17、第一射频带通滤波器18、第二射频带通滤波器19、射频混频器20、第三射频带通滤波器21、第二射频源22、伺服控制器23、压控振荡器24、第三声光移频器25和第三射频源26组成，所述的第二声光移频器14的第1、2光学端口分别与所述的第一光纤链路2的2端口、所述的X型光耦合器16的第1端口相连，所述的X型光耦合器16的第2、3、4端口分别与所述的光电转换单元17的光学端口、所述的第二法拉第旋转镜15、所述的第三声光移频器25的第1光学端口相连，所述的光电转换单元17的输出端分别与所述的第一射频带通滤波器18的输入端和所述的第二射频带通滤波器19的输入端相连，所述的射频混频器20的第1、2输入端和输出端分别与所述的第一射频带通滤波器18的输入端、所述的第二射频带通滤波器19的输入端、所述的第三射频带通滤波器21的输入端相连，所述的第三射频带通滤波器21的输出端与所述的伺服控制器23的第1射频输入端口相连，所述的第二射频源22的输出端与所述的伺服控制器23的第2射频输入端相连，所述的伺服控制器23的输出端与所述的压控振荡器24的输入端相连，所述的压控振荡器24的输出端与第二声光移频器14的射频接口相连，所述的第三声光移频器25的第2光学端口、射频接口分别与所述的第二光纤链路4的1端口、所述的第三射频源26相连；The cascade station 3 is composed of a second acousto-
所述的用户端5由第四声光移频器27、第二Y型光耦合器28、第三法拉第旋转镜29和第四射频源30组成，所述的第四声光移频器27的第1、2光学端口、射频端口分别与所述的第二光纤链路4的2端口、所述的第二Y型光耦合器28的1端口、所述的第四射频源30的射频口相连，所述的第二Y型光耦合器28的2、3端口分别与所述的第三法拉第旋转镜29、用户端输入接口相连。The user terminal 5 is composed of a fourth acousto-optic frequency shifter 27, a second Y-type
所述的第一光纤链路2和第二光纤链路4由光纤、双向光放大器组成。The first optical fiber link 2 and the second optical fiber link 4 are composed of optical fibers and bidirectional optical amplifiers.
利用上述级联的光学频率传递装置的光学频率传递方法，该方法具体步骤如下：Using the optical frequency transmission method of the above-mentioned cascaded optical frequency transmission devices, the specific steps of the method are as follows:
1)本地端待传递的光学频率信号E0＝cos[vt]经过所述的第一Y型光耦合器10后在所述的第一法拉第旋转镜13和所述的第二法拉第旋转镜15之间多次反射，多次反射之后达到所述的光电转换单元17上的光学频率信号为：1) The optical frequency signal E0 =cos[vt] to be transmitted at the local end passes through the first Y-type
式中，n为光学频率信号在所述的第一光纤链路2中反射的次数，ωl和ωm分别为所述的第一声光移频器11的射频工作频率和所述的第二声光移频器14的射频工作频率，φp1为在所述的第一光纤链路2中单向传输引入的相位噪声，φc为补偿相位；In the formula, n is the number of times the optical frequency signal is reflected in the first optical fiber link 2, ωl and ωm are the radio frequency operating frequency of the first acousto-
2)所述的E1经过所述的第一X型光耦合器16、所述的第三声光移频器25和所述的第二光纤链路4后，所述的第四声光移频器27、所述的用户端5接收到信号可表示为：2) After the E1 passes through thefirst X-type
Er∝cos[v+(ωs+ωr+ωl+ωm)t+(φp1+φp2+φc)]Er ∝cos[v+(ωs +ωr +ωl +ωm )t+(φp1 +φp2 +φc )]
式中，ωs和ωr分别为所述的第三声光移频器25的射频工作频率，和所述的第四声光移频器27的射频工作频率，φp2为在所述的第二光纤链路4中单向传输引入的相位噪声；In the formula, ωs and ωr are respectively the radio frequency working frequency of the third acousto-optic frequency shifter 25 and the radio frequency working frequency of the fourth acousto-optic frequency shifter 27, and φp2 is the Phase noise introduced by unidirectional transmission in the second optical fiber link 4;
3)所述的Er再次经过所述的第二Y型光耦合器28、所述的第四声光移频器27、第二光纤链路4、第三声光移频器25、第一X型光耦合器16进入所述的光电转换单元17，进入所述的光电转换单元17的信号可表示为：3) The Er passes through the second Y-type
4)所述的E1和E2经过所述的光电转换单元17拍频后，获得：4) After described E1 and E2 pass through described photoelectric conversion unit 17 beat frequency, obtain:
5)所述的E3经过中心频率为2(ωs+ωr)和2(ωl+ωm)的所述的第一射频带通滤波器18和所述的第二射频带通滤波器19滤出的信号分别为：5) The E3 passes through the first radio frequency bandpass filter 18 and the second radio frequency bandpass filter whose center frequencies are 2(ωs +ωr ) and 2(ωl +ωm ) The signals filtered by the device 19 are:
E4∝cos[2(ωs+ωr)t+2φp2]，E5∝cos[2(ωl+ωm)t+2(φp1+φc)]；E4 ∝cos[2(ωs +ωr )t+2φp2 ], E5 ∝cos[2(ωl +ωm )t+2(φp1 +φc )];
6)所述的E4和E5经过所述的射频混频器20后，通过所述的第三射频带通滤波器21后取出上边带信号：6) After the described E4 and E5 pass through the described radio frequency mixer 20, the upper sideband signal is taken out after passing through the described third radio frequency bandpass filter 21:
E6∝cos[2(ωs+ωr+ωl+ωm)t+2(φp1+φp2+φc)]；E6 ∝cos[2(ωs +ωr +ωl +ωm )t+2(φp1 +φp2 +φc )];
7)所述的伺服控制器23将所述的E6与所述的第二射频源22输出的频率2(ωs+ωr+ωl+ωm)进行比较，获得E6的相位噪声，并采用伺服控制算法使得：7) The servo controller 23 compares theE6 with the frequency 2 (ωs +ωr +ω1+ωm) output by the second radio frequency source 22 to obtain the phase noise ofE6 , and the servo control algorithm is used to make:
φc＝-(φp1+φp2)；φc =-(φp1 +φp2 );
8)将上式代入Er，用户端5接收到的频率可表示为：8) Substituting the above formula into Er , the frequency received by the user terminal 5 can be expressed as:
Er′∝cos[v+(ωs+ωr+ωl+ωm)t]；Er′ ∝cos[v+(ωs +ωr +ωl +ωm )t];
可见，补偿了第一光纤链路2和第二光纤链路4引入的相位噪声。It can be seen that the phase noise introduced by the first fiber link 2 and the second fiber link 4 is compensated.
实验表明，本发明的级联站同时获取第一光纤链路和第二光纤链路引入的相位噪声，并通过级联站的相位补偿单元同时补偿第一光纤链路和第二光纤链路引入的相位噪声，使得用户端获得相位稳定的光学频率信号，实现了级联的光学频率传递。本发明通过在级联光纤链路可有效提高相位补偿带宽，有效地降低了系统噪底，此外还具有系统结构简单、可靠性高的特点。Experiments show that the cascading station of the present invention simultaneously acquires the phase noise introduced by the first optical fiber link and the second optical fiber link, and simultaneously compensates the phase noise introduced by the first optical fiber link and the second optical fiber link through the phase compensation unit of the cascading station. The phase noise makes the user end obtain a phase-stable optical frequency signal, and realizes the cascaded optical frequency transmission. The invention can effectively improve the phase compensation bandwidth by cascading optical fiber links, effectively reduce the noise floor of the system, and also has the characteristics of simple system structure and high reliability.
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