CN112769490B - Feedforward phase compensation relay station device and method for optical frequency transmission - Google Patents
Feedforward phase compensation relay station device and method for optical frequency transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/299—Signal waveform processing, e.g. reshaping or retiming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B2210/006—Devices for generating or processing an RF signal by optical means
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- H—ELECTRICITY
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- H04B—TRANSMISSION
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- H04B2210/25—Distortion or dispersion compensation
- H04B2210/256—Distortion or dispersion compensation at the repeater, i.e. repeater compensation
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Abstract
The invention relates to a feedforward phase compensation relay station device and a method for optical frequency transmission, wherein the device comprises an output signal for locking a local laser to a preceding link and an optical signal after locking to a next link.
Description
Technical Field
The present invention relates to optical fiber time and frequency transfer, and more particularly, to a feed forward phase compensation repeater apparatus and method for optical frequency transfer.
Background
With the rapid development of the optical frequency standard technology, the optical frequency standard technology has become a strong candidate for the next generation of time frequency reference. At present, a satellite-based space-based time frequency synchronization system can only realize nanosecond-level time synchronization precision and 10 nanosecond-level time synchronization precision-15The transmission precision of the frequency transmission stability per day can not meet the requirement of long-distance transmission of high-precision optical clock signals. Optical frequency transmission technology based on optical fiber or free space link has been proved to be an effective solution for realizing long-distance transmission by breaking through the limitation of the prior art for many times. The optical fiber has the advantages of low loss, high reliability, large bandwidth, no electromagnetic interference, small external disturbance and the like. However, since the optical fiber link is constructed by erection and burying, it is easily interfered by external environment, such as vibration and temperature. In addition, when an optical signal is transmitted in an optical fiber,losses also accumulate with increasing distance, causing degradation in signal quality. Therefore, to realize stable long-distance transmission of optical frequency signals in the optical fiber, it is necessary to solve the problems of loss and susceptibility to interference during transmission.
Currently, research on the transmission of high-precision optical frequency signals by using optical fiber links based on optical amplification has been carried out successively in developed countries in europe and america, and quite promising results have been obtained. But the optical amplification based scheme has a limited bandwidth due to the delay of the link, which also limits the noise suppression effect. In order to solve the above problems, france proposed a relay amplification scheme in 2015, in which a laser is locked to the signal light in a relay station to generate a new transmission light to be transmitted to the previous link and the next link respectively, so as to achieve amplification of signal lights of two links before and after the signal [ n.chiodo, n.q.s., f.s.stari, f.wiotte, e.camisard, c.chardonnet, g.santarelli, a.amy-Klein, p.e.pottier, and o.lopez, a.cad optical fiber using the internet network for removing clocks. In this way, the problem that the control bandwidth and the link are easily interfered can be well solved. However, this solution is only suitable for actively adopting an active phase lock mode, which has high requirements on the servo controller and low reliability.
Disclosure of Invention
The present invention is directed to a feed forward phase compensation repeater and method for optical frequency transfer, which overcomes the shortcomings of the prior art and the related art. The invention realizes relay amplification by a feedforward phase compensation mode and has the characteristics of simple system structure and high reliability.
The technical solution of the invention is as follows:
a feed forward phase compensated repeater station arrangement for optical frequency transfer comprising an output signal section for locking a local laser to a preceding link and a section for transferring a locked optical signal to a next link;
the output signal for locking the local laser to the preceding link consists of a laser, a first Y-shaped optical coupler, a polarization controller, a second Y-shaped optical coupler, a first photoelectric converter, a radio frequency mixer, a radio frequency source, a first acousto-optic frequency shifter, a first servo controller, a second servo controller, an electric control polarization controller, a third Y-shaped coupler and a fourth Y-shaped coupler, and the output end of the laser is connected with the 1 st port of the first Y-shaped optical coupler; the 2 nd port of the first Y-shaped optical coupler is connected with the 1 st port of the first acousto-optic frequency shifter, the 2 nd ports and the 3 rd ports of the first Y-shaped optical coupler are respectively connected with the 1 st port of the polarization controller and the 1 st port of the second acousto-optic frequency shifter, the second disconnection of polarization control is connected with the 3 rd port of the second Y-shaped optical coupler, the 2 nd port of the first acousto-optic frequency shifter is connected with the 1 st port of the fourth Y-shaped beam splitter, the 2 nd port of the fourth Y-shaped optical coupler is connected with the 2 nd port of the third Y-shaped optical coupler, the 3 rd port of the third Y-shaped optical coupler is connected with the 2 nd port of the second Y-shaped optical coupler, the 1 st port of the second Y-shaped optical coupler is connected with the optical input end of the first photoelectric converter, the 1 st port of the first photoelectric converter and the 1 st port of the second photoelectric converter are connected with the optical input end of the first acousto-optic frequency shifter, and the second port of the second acousto-optic frequency shifter are connected with the 1 st port of the second acousto-optic frequency shifter, and the second port of the second acousto-optic frequency shifter are connected with the third port of the second Y-optic frequency shifter, and the third port of the third Y-optic frequency shifter, and the third port of the second Y-optic frequency shifter, and the second Y-optic frequency shifter are connected with the second Y-type optical coupler, and the second photoelectric converter, and the second port of the second photoelectric converter, and the second photoelectric converter are connected with the second photoelectric converter, and the third port of the second photoelectric converter, and the third port of the second port of the third port of the second port of the, 2. The output end of the 3 is respectively connected with the input end of the first servo controller, the input end of the second servo controller and the input end of the 1 st of the radio frequency mixer, the output end of the first servo controller is connected with the electric control polarization controller, the output end of the second servo controller is connected with the control end of the laser, the 2 nd input end of the radio frequency mixer is connected with the radio frequency source, and the output end of the radio frequency mixer is connected with the radio frequency input end of the first acousto-optic frequency shifter;
the optical signal after being locked is transmitted to the next-stage link part and consists of an X-type optical coupler, a Faraday rotator mirror, a second acousto-optic frequency shifter, a second photoelectric converter, a radio frequency divider, a third servo controller and a voltage-controlled oscillator, wherein the 3 rd port of the fourth Y-type optical coupler is connected with the 1 st port of the X-type optical coupler, the 2 nd, 3 rd and 4 th ports of the X-type optical coupler are respectively connected with the 1 st optical ports of the second photoelectric converter, the Faraday rotator mirror and the second acousto-optic frequency shifter, the 2 nd optical port of the second acousto-optic frequency shifter is connected with a link N +1, the output end of the second photoelectric converter is connected with the input end of the radio frequency divider, the radio frequency divider is connected with the third servo controller, and the output end of the third servo controller is connected with the voltage-controlled end of the voltage-controlled oscillator, and the radio frequency output end of the voltage-controlled oscillation is connected with the radio frequency port of the second acousto-optic frequency shifter.
The relay method of the relay device using the passive phase compensation optical frequency transmission link is characterized by comprising the following specific steps:
a signal cos (vt) (v received optical carrier frequency) received from a link N passes through the 1 st port and the 3 rd port of the third Y-type optical coupler, the 2 nd port and the 1 st port of the second Y-type optical coupler and the output light of the laser passes through the 1 st port and the 2 nd port of the first Y-type optical coupler, the 1 st port and the 2 nd port of the polarization controller and the 3 rd port and the 1 st port of the second Y-type optical coupler and is subjected to beat frequency on the first photoelectric converter, and a beat frequency signal is
E2∝Acos(ωt+δφH+δφL)，
Wherein A is the amplitude of the signal, omega, delta phiH，δφLThe relay receives the radio frequency difference between the signal cos (vt) from the link N and the output optical signal of the laser, high frequency phase noise and low frequency phase noise. The first servo control unit is based on E2Amplitude A of the signal controlling said electrically controlled polarization controller E2The amplitude a of the signal is maximum. Said second servo control unit is based on E2Low frequency phase noise delta phi of signalLBy controlling the operating temperature or cavity length of the laser to delta phiLCompensated E02Can be expressed as
E2∝Acos(ωt+δφH)，
Will E2And the angular frequency of the output of the radio frequency source is omega0(ω0Omega) microwave signal is mixed and then low-frequency signal is filtered
E3∝Acos((ω0-ω)t-δφH)，
Radio frequency signal E3The amplified signal is input to the radio frequency port of the first acousto-optic frequency shifter, and the optical frequency signal output by the 2 nd port of the first acousto-optic frequency shifter can be represented as
E4∝Acos((v+ω0)t)，
Visible signal E4Has locked onto the signal cos (vt) received by the relay from link N.
Signal E to be phase locked4The optical frequency signal is transmitted to the user end through the transmission link N +1, the user end returns to the local end through the optical frequency shift, the returned optical frequency signal passes through the 2 nd and 1 st ports of the second optical frequency shifter, the 4 th and 2 nd ports of the X-type beam splitter and the optical frequency signal E4After the beat frequency is obtained on the second photoelectric converter, the radio frequency signal is filtered out to obtain the phase noise introduced by the transmission link, after the filtered radio frequency signal passes through the radio frequency divider, the frequency divided signal passes through the third servo controller to control the voltage control end of the voltage controlled oscillator, so that the user end of the link N +1 obtains an optical frequency signal with stable phase, and the phase-stable transmission of the optical frequency of the link N +1 is realized.
Compared with the prior art, the invention can realize the locking of the laser phase through simple optical mixing, phase discrimination and optical frequency shift. Compared with active phase compensation, the method can effectively reduce the complexity of the system and effectively improve the reliability of the system.
Drawings
FIG. 1 is a schematic diagram of a feedforward phase compensation relay device for optical frequency transfer according to an embodiment of the present invention
Detailed Description
The present invention is further described with reference to the following embodiments and the accompanying drawings, wherein the embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific work flows are provided, but the scope of the present invention is not limited to the following embodiments.
Fig. 1 is a schematic structural diagram of an embodiment of a feed-forward phase compensation relay apparatus for optical frequency transfer according to the present invention, which includes an output signal portion for locking a local laser to a previous link and a portion for transferring a locked optical signal to a next link; the output signal part for locking the local laser to the pre-stage link comprises a laser 1, a first Y-shaped optical coupler 2, a polarization controller 3, a second Y-shaped optical coupler 4, a first photoelectric converter 5, a radio frequency mixer 6, a radio frequency source 7, a first acousto-optic frequency shifter 8, a first servo controller 9, a second servo controller 10, an electric control polarization controller 11, a third Y-shaped coupler 12 and a fourth Y-shaped coupler 13;
the output end of the laser 1 is connected with the 1 st port of the first Y-type optical coupler 2, the 2 nd port of the first Y-type optical coupler 2 is connected with the 1 st port of the polarization controller 3, the 3 rd port of the first Y-type optical coupler 2 is connected with the 1 st port of the first acousto-optic frequency shifter 8, the 2 nd port of the polarization controller 3 is connected with the 3 rd port of the second Y-type optical coupler 4, the 2 nd port of the first acousto-optic frequency shifter 8 is connected with the 1 st port of the fourth Y-type beam splitter 13, the 2 nd port of the fourth Y-type optical coupler 13 is connected with the 2 nd port of the third Y-type optical coupler 12, the 3 rd port of the third Y-type optical coupler 12 is connected with the 2 nd port of the second Y-type optical coupler 4, the 1 st port of the second Y-type optical coupler 4 is connected with the optical input end of the first photoelectric converter 5, the output ends 1, 2 and 3 of the first photoelectric converter 5 are respectively connected with the input end of the first servo controller 9, the input end of the second servo controller 10 and the input end 1 of the radio frequency mixer 6, the output end of the first servo controller 9 is connected with the electric control polarization controller 11, the output end of the second servo controller 10 is connected with the control end of the laser 1, the input end 2 of the radio frequency mixer 6 is connected with the radio frequency source 7, and the output end of the radio frequency mixer 6 is connected with the radio frequency input end of the first acousto-optic frequency shifter 8;
the part for transmitting the locked optical signal to the next-stage link comprises an X-type optical coupler 14, a Faraday rotator mirror 15, a second acousto-optic frequency shifter 16, a second photoelectric converter 17, a radio frequency divider 18, a third servo controller 19 and a voltage-controlled oscillator 20; the 3 rd port of the fourth Y-type optical coupler 13 is connected to the 1 st port of the X-type optical coupler 14, the 2 nd, 3 rd, and 4 th ports of the X-type optical coupler 14 are respectively connected to the input end of the second photoelectric converter 17, the faraday rotator 15, and the 1 st optical port of the second optical frequency shifter 16, the 2 nd optical port of the second optical frequency shifter 16 is connected to the link N +1, the output end of the second photoelectric converter 17 is connected to the input end of the radio frequency divider 18, the radio frequency divider 18 is connected to the third servo controller 19, the output end of the third servo controller 19 is connected to the voltage-controlled end of the voltage-controlled oscillator 20, and the radio frequency output end of the voltage-controlled oscillator 20 is connected to the radio frequency port of the second optical frequency shifter 16.
The relay method of the relay device using the passive phase compensation optical frequency transmission link comprises the following specific steps:
the signal cos (vt) (v received optical carrier frequency) received from the link N passes through the 1 st and 3 rd ports of the third Y-type optical coupler 12, the 2 nd and 1 st ports of the second Y-type optical coupler 4 and the output light of the laser 1 passes through the 1 st and 2 nd ports of the first Y-type optical coupler 2, the 1 st and 2 nd ports of the polarization controller 3 and the 3 rd and 1 st ports of the second Y-type optical coupler 4 to beat on the first photoelectric converter 5, and the beat signal is
E2∝Acos(ωt+δφH+δφL)，
In which A is a signal E2Amplitude of (e), omega, delta phiH，δφLReceiving a radio frequency difference, high-frequency phase noise and low-frequency phase noise between a signal cos (vt) received by a relay end from a link N and an output optical signal of the laser 1;
the first servo control unit 9 is based on the signal E2Amplitude a of (a) controls the electrically controlled polarization controller 11 to make signal E2Is the largest, said second servo control unit 10 is dependent on the signal E2Low frequency phase noise deltaφLBy controlling the operating temperature or cavity length of the laser 1 so that delta phiLCompensated E02Can be expressed as
E2∝Acos(ωt+δφH)，
Will be compensated E2And the angular frequency of the output of the radio frequency source (7) is omega0(ω0Omega) microwave signal is mixed and then low-frequency signal is filtered
E3∝Acos((ω0-ω)t-δφH)，
Radio frequency signal E3Amplified and input to the radio frequency port of the first acousto-optic frequency shifter 8, and the optical frequency signal output from the 2 nd port of the first acousto-optic frequency shifter 8 can be represented as
E4∝Acos((v+ω0)t)，
Signal E to be phase locked4The optical frequency signal is transmitted to the user terminal through the transmission link N +1, the user terminal returns to the local terminal through the optical frequency shift, the returned optical frequency signal passes through the 2 nd and 1 st ports of the second optical frequency shifter 16, the 4 th and 2 nd ports of the X-type beam splitter 14 and the phase-locked signal E4After the beat frequency is applied to the second photoelectric converter 17, the rf signal is filtered out to obtain the phase noise introduced by the transmission link, and after the filtered rf signal passes through the rf frequency divider 18, the frequency-divided signal passes through the third servo controller 19 to control the voltage-controlled end of the voltage-controlled oscillator 20, so that the user end of the link N +1 obtains the optical frequency signal with stable phase, thereby realizing the phase-stable transmission of the optical frequency of the link N + 1.
Claims (2)
1. A feed forward phase compensated repeater station arrangement for optical frequency transfer comprising an output signal section for locking a local laser to a preceding link and a section for transferring a locked optical signal to a next link;
the output signal part for locking the local laser to the pre-stage link comprises a laser (1), a first Y-shaped optical coupler (2), a polarization controller (3), a second Y-shaped optical coupler (4), a first photoelectric converter (5), a radio frequency mixer (6), a radio frequency source (7), a first acousto-optic frequency shifter (8), a first servo controller (9), a second servo controller (10), an electric control polarization controller (11), a third Y-shaped optical coupler (12) and a fourth Y-shaped optical coupler (13);
the output end of the laser (1) is connected with the 1 st port of the first Y-type optical coupler (2), the 2 nd port of the first Y-type optical coupler (2) is connected with the 1 st port of the polarization controller (3), the 3 rd port of the first Y-type optical coupler (2) is connected with the 1 st port of the first acousto-optic frequency shifter (8), the 2 nd port of the polarization controller (3) is connected with the 3 rd port of the second Y-type optical coupler (4), the 2 nd port of the first acousto-optic frequency shifter (8) is connected with the 1 st port of the fourth Y-type optical coupler (13), the 2 nd port of the fourth Y-type optical coupler (13) is connected with the 2 nd port of the third Y-type optical coupler (12), the 1 st port of the third Y-type optical coupler (12) is connected with the output end of the polarization controller (11), the 3 rd port of the third Y-shaped optical coupler (12) is connected with the 2 nd port of the second Y-shaped optical coupler (4), the 1 st port of the second Y-shaped optical coupler (4) is connected with the optical input end of the first photoelectric converter (5), the 1 st, 2 nd and 3 th output ends of the first photoelectric converter (5) are respectively connected with the input end of the first servo controller (9), the input end of the second servo controller (10) and the 1 st input end of the radio frequency mixer (6), the output end of the first servo controller (9) is connected with the control end of the electric control polarization controller (11), the output end of the second servo controller (10) is connected with the control end of the laser (1), the 2 nd input end of the radio frequency mixer (6) is connected with the radio frequency source (7), the output end of the radio frequency mixer (6) is connected with the radio frequency input end of the first acousto-optic frequency shifter (8); the input end of the electric control polarization controller (11) is connected with the link N;
the part for transmitting the locked optical signal to the next-stage link comprises an X-type optical coupler (14), a Faraday rotator mirror (15), a second acoustic-optical frequency shifter (16), a second photoelectric converter (17), a radio frequency divider (18), a third servo controller (19) and a voltage-controlled oscillator (20);
the 3 rd port of the fourth Y-shaped optical coupler (13) is connected with the 1 st port of the X-shaped optical coupler (14), the 2 nd, 3 rd and 4 th ports of the X-type optical coupler (14) are respectively connected with the input end of the second photoelectric converter (17), the Faraday rotator mirror (15) and the 1 st optical port of the second acoustic optical frequency shifter (16), the 2 nd optical port of the second acousto-optic frequency shifter (16) is connected with a link N +1, the output end of the second photoelectric converter (17) is connected with the input end of the radio frequency divider (18), the output end of the radio frequency divider (18) is connected with the input end of the third servo controller (19), the output end of the third servo controller (19) is connected with the voltage control end of the voltage-controlled oscillator (20), and the radio frequency output end of the voltage-controlled oscillator (20) is connected with the radio frequency port of the second acousto-optic frequency shifter (16).
2. A relay method using a feedforward phase compensation relay station apparatus for optical frequency transfer according to claim 1, the method comprising the steps of:
receiving a signal cos (vt) from a link N, wherein v is a received optical carrier frequency, the signal passes through ports 1 and 3 of a third Y-type optical coupler (12), ports 2 and 1 of a second Y-type optical coupler (4) and the output light of the laser (1) passes through ports 1 and 2 of the first Y-type optical coupler (2), ports 1 and 2 of the polarization controller (3) and ports 3 and 1 of the second Y-type optical coupler (4) and is subjected to beat frequency on the first photoelectric converter (5), and a signal after beat frequency is a beat frequency signal
E2∝Acos(ωt+δφH+δφL)，
In which A is a signal E2Amplitude of (e), omega, delta phiH，δφLReceiving a radio frequency difference, high-frequency phase noise and low-frequency phase noise between a signal cos (vt) received by a relay end from a link N and an output optical signal of the laser (1);
the first servo controller (9) is based on the signal E2Controls the electrically controlled polarization controller (11) to cause a signal E2Is the largest, said second servo controller (10) being based onSignal E2Low frequency phase noise delta phiLBy controlling the operating temperature or the cavity length of the laser (1) delta phiLCompensated E02Can be expressed as
E2∝Acos(ωt+δφH)，
Will be compensated E2And the angular frequency of the output of the radio frequency source (7) is omega0And ω is0Omega, microwave signal is mixed and then low-frequency signal is filtered
E3∝Acos((ω0-ω)t-δφH)，
Radio frequency signal E3Amplified and input to the radio frequency port of the first acousto-optic frequency shifter (8), and the optical frequency signal output from the 2 nd port of the first acousto-optic frequency shifter (8) can be represented as
E4∝Acos((v+ω0)t)，
Phase locked signal E4The optical frequency signal is transmitted to the user end through a transmission link N +1, the user end returns to the local end through optical frequency shift, the returned optical frequency signal passes through the 2 nd and 1 st ports of the second optical frequency shifter (16), the 4 th and 2 nd ports of the X-type optical coupler (14) and a phase-locked signal E4After the beat frequency of the second photoelectric converter (17) is obtained, the radio frequency signal is filtered out to obtain the phase noise introduced by the transmission link, after the filtered radio frequency signal passes through the radio frequency divider (18), the frequency divided signal passes through the third servo controller (19) to control the voltage control end of the voltage controlled oscillator (20), so that the user end of the link N +1 obtains an optical frequency signal with stable phase, and the stable phase transmission of the optical frequency of the link N +1 is realized.
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