CN113259007B - Cascaded optical frequency transfer device and method - Google Patents
Cascaded optical frequency transfer device and method Download PDFInfo
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- CN113259007B CN113259007B CN202110701941.8A CN202110701941A CN113259007B CN 113259007 B CN113259007 B CN 113259007B CN 202110701941 A CN202110701941 A CN 202110701941A CN 113259007 B CN113259007 B CN 113259007B
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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
- H04B10/29—Repeaters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/003—Devices including multiple stages, e.g., multi-stage optical amplifiers or dispersion compensators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/25—Distortion or dispersion compensation
- H04B2210/256—Distortion or dispersion compensation at the repeater, i.e. repeater compensation
Abstract
The cascade station simultaneously acquires 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 a phase compensation unit of the cascade station, so that the user terminal obtains optical frequency signals with stable phases, and the cascade optical frequency transmission is realized. The invention can effectively improve the phase compensation bandwidth through the cascade optical fiber link, effectively reduces the system noise, and has the characteristics of simple system structure and high reliability.
Description
Technical Field
The invention relates to optical fiber time and frequency transmission, in particular to a cascaded optical frequency transmission device and a transmission method.
Background
With the rapid development of cold atom technology, the optical atomic clock including photo-ion clock and photo-lattice clock has been developed rapidly, and its accuracy is close to 10-19The magnitude is higher than that of the existing microwave atomic clock by at least one magnitude, and the microwave atomic clock becomes a powerful competitor of the next generation time frequency reference. Various time-frequency transmission methods have been developed, and the most widely used satellite-based space-based frequency transmission can only achieve 10-15Frequency transmission stability per day. Besides the time-frequency transmission mode based on the space-based satellite, the optical frequency transmission technology based on the optical fiber link is proved to be an effective solution for breaking through the limitation of the prior art and realizing long-distance transmission for many times. However, long-distance transmission is limited by the time delay of the optical fiber, which limits the compensation band-pass of the system, resulting in poor phase noise compensation 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]. By such meansThe method can well solve the problem that the control bandwidth and the link are easily interfered. However, this scheme requires a phase locking module for both the relay station and the front and rear links, which easily causes a decrease in the reliability of the system.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned deficiencies of the prior art and providing a cascaded optical frequency transfer apparatus and method. The cascade station 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 cascade station phase compensation unit, so that a user side obtains an optical frequency signal with stable phase, and the cascade optical frequency transmission is realized. The invention can effectively improve the phase compensation bandwidth through the cascade optical fiber link, effectively reduces the system noise, and has the characteristics of simple system structure and high reliability.
The technical solution of the invention is as follows:
a cascaded optical frequency transmission device is characterized by comprising a local end, a first optical fiber link, a cascade station, a second optical fiber link and a user end;
the local end consists of a first Y-shaped optical coupler, a first acousto-optic frequency shifter, a first radio frequency source and a first Faraday rotator mirror, wherein a port 1, a port 2 and a port 3 of the first Y-shaped optical coupler are respectively connected with a port 1 of the first acousto-optic frequency shifter, an optical frequency input port to be transmitted and the first Faraday rotator mirror, and a port 2 and a radio frequency interface of the first acousto-optic frequency shifter are respectively connected with a port 1 of the first optical fiber link and an output end of the first radio frequency source;
the cascade station consists of a second acousto-optic frequency shifter, a second Faraday rotator mirror, an X-type optical coupler, a photoelectric conversion unit, a first RF band-pass filter, a second RF band-pass filter, an RF mixer, a third RF band-pass filter, a second RF source, a servo controller, a voltage-controlled oscillator, a third acousto-optic frequency shifter and a third RF source, wherein the 1 st and 2 nd optical ports of the second acousto-optic frequency shifter are respectively connected with the 2 nd port of the first optical fiber link and the 1 st port of the X-type optical coupler, the 2 nd, 3 th and 4 nd ports of the X-type optical coupler are respectively connected with the optical port of the photoelectric conversion unit, the second Faraday rotator mirror and the 1 st optical port of the third acousto-optic frequency shifter, the output end of the photoelectric conversion unit is respectively connected with the input end of the first RF band-pass filter and the input end of the second RF band-pass filter, the 1 st and 2 nd input ends and the output ends of the radio frequency mixers are respectively connected with the input end of the first radio frequency band-pass filter, the input end of the second radio frequency band-pass filter and the input end of the third radio frequency band-pass filter, the output end of the third radio frequency band-pass filter is connected with the 1 st radio frequency input port of the servo controller, the output end of the second radio frequency source is connected with the 2 nd radio frequency input end of the servo controller, the output end of the servo controller is connected with the input end of the voltage-controlled oscillator, the output end of the voltage-controlled oscillator is connected with the radio frequency interface of the second acousto-optic frequency shifter, and the 2 nd optical port and the radio frequency interface of the third acousto-optic frequency shifter are respectively connected with the 1 st port of the second optical fiber link and the radio frequency port of the third radio frequency source;
the user side consists of a fourth acousto-optic frequency shifter, a second Y-shaped optical coupler, a third Faraday rotator mirror and a fourth radio frequency source, wherein the 1 st and 2 nd optical ports and the radio frequency port of the fourth acousto-optic frequency shifter are respectively connected with the 2 nd port of the second optical fiber link, the 1 st port of the second Y-shaped optical coupler and the radio frequency port of the fourth radio frequency source, and the 2 rd and 3 rd ports of the second Y-shaped optical coupler are respectively connected with the third Faraday rotator mirror and the input interface of the user side.
The first optical fiber link and the second optical fiber link are composed of optical fibers and bidirectional optical amplifiers.
The optical frequency transmission method using the cascade optical frequency transmission device comprises the following specific steps:
1) optical frequency signal E to be transmitted at local end0＝cos[vt]Through the saidAfter the first Y-type optical coupler, the optical frequency signal reaching the photoelectric conversion unit after multiple reflections is reflected for multiple times between the first faraday rotator mirror and the second faraday rotator mirror:
where n is the number of times an optical frequency signal is reflected in said first optical fiber link, wlAnd ωmRespectively the radio frequency working frequency of the first acousto-optic frequency shifter and the radio frequency working frequency, phi, of the second acousto-optic frequency shifterp1Phase noise, phi, introduced for unidirectional transmission in said first optical fiber linkcTo compensate for phase;
2) said E1After passing through the first X-type optical coupler, the third acousto-optic frequency shifter and the second optical fiber link, the signals received by the fourth acousto-optic frequency shifter and the user side can be represented as:
Er∝cos[v+(ωs+ωr+ωl+ωm)t+(φp1+φp2+φc)]
in the formula, omegasAnd ωrRespectively the radio frequency working frequency, phi, of the third acousto-optic frequency shifter and the fourth acousto-optic frequency shifterp2Phase noise introduced for unidirectional transmission in said second optical fiber link;
3) said ErAnd the signal enters the photoelectric conversion unit 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 optical coupler again, and the signal entering the photoelectric conversion unit can be represented as:
4) said E1And E2Through the photoelectric conversion unitAfter the beat frequency, obtain:
5) said E3Passing through a center frequency of 2(ω)s+ωr) And 2(ω)l+ωm) The signals filtered by the first radio frequency band-pass filter and the second radio frequency band-pass filter are respectively as follows:
E4∝cos[2(ωs+ωr)t+2φp2]，E5∝cos[2(ωl+ωm)t+2(φp1+φc)]；
6) said E4And E5After passing through the radio frequency mixer, the upper sideband signal is taken out after passing through the third radio frequency band pass filter:
E6∝cos[2(ωs+ωr+ωl+ωm)t+2(φp1+φp2+φc)]；
7) the servo controller sends the E6Frequency 2 (omega) of said second RF source outputs+ωr+ωl+ωm) Comparing to obtain E6And a servo control algorithm is employed such that:
φc＝-(φp1+φp2)；
8) substituting the above formula into ErThe frequency received by the ue can be expressed as:
Er′∝cos[v+(ωs+ωr+ωl+ωm)t]；
the phase noise introduced by the first and second optical fiber links is compensated.
The working principle of the 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 phase noise introduced by the first optical fiber link and the second optical fiber link is simultaneously compensated through the cascade station phase compensation unit, so that the user side obtains an optical frequency signal with stable phase, and the cascade optical frequency transmission is realized.
The invention has the following technical effects:
the invention can effectively improve the phase compensation bandwidth through the cascade optical fiber link, effectively reduces the system noise floor, and has the characteristics of simple system structure and high reliability
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1 of a cascaded optical frequency transfer device 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a cascaded optical frequency transmission apparatus in an embodiment 1 of the present invention, and it can be seen from the diagram that the cascaded optical frequency transmission apparatus in the present invention includes a local end 1, a first optical fiber link 2, a cascade station 3, a second optical fiber link 4, and a user end 5;
the local end 1 is composed of a first Y-type optical coupler 10, a first acousto-optic frequency shifter 11, a first radio frequency source 12 and a first faraday rotator mirror 13, wherein a port 1, a port 2 and a port 3 of the first Y-type optical coupler 10 are respectively connected with a port 1 of the first acousto-optic frequency shifter 11, an optical frequency input port to be transmitted and the first faraday rotator mirror 13, and a port 2 and a radio frequency interface of the first acousto-optic frequency shifter 11 are respectively connected with a port 1 of the first optical fiber link 2 and an output end of the first radio frequency source 12;
the cascade station 3 comprises a second acousto-optic frequency shifter 14, a second Faraday rotator mirror 15, an X-type optical coupler 16, a photoelectric conversion unit 17, a first RF band-pass filter 18, a second RF band-pass filter 19, an RF mixer 20, a third RF band-pass filter 21, a second RF source 22, a servo controller 23, a voltage-controlled oscillator 24, a third acousto-optic frequency shifter 25 and a third RF source 26, wherein the 1 st and 2 nd optical ports of the second acousto-optic frequency shifter 14 are respectively connected with the 2 nd port of the first optical fiber link 2 and the 1 st port of the X-type optical coupler 16, the 2 nd, 3 nd and 4 nd ports of the X-type optical coupler 16 are respectively connected with the optical port of the photoelectric conversion unit 17, the second Faraday rotator mirror 15 and the 1 st optical port of the third acousto-optic frequency shifter 25, and the output end of the photoelectric conversion unit 17 is respectively connected with the input end of the first RF filter 18 and the third RF band-pass filter The input ends of the two radio frequency band-pass filters 19 are connected, the 1 st and 2 nd input ends and the output ends of the radio frequency mixer 20 are respectively connected with the input end of the first radio frequency band-pass filter 18, the input end of the second radio frequency band-pass filter 19 and the input end of the third radio frequency band-pass filter 21, the output end of the third radio frequency band-pass filter 21 is connected with the 1 st radio frequency input port of the servo controller 23, the output end of the second radio frequency source 22 is connected with the 2 nd radio frequency input end of the servo controller 23, the output end of the servo controller 23 is connected with the input end of the voltage-controlled oscillator 24, the output end of the voltage-controlled oscillator 24 is connected with the radio frequency interface of the second acousto-optic frequency shifter 14, the 2 nd optical port and the radio frequency interface of the third acousto-optic frequency shifter 25 are respectively connected with the 1 port, the 1 st port, the 2 nd optical port and the radio frequency interface of the second acousto-optic frequency shifter 4, The third radio frequency source 26 is connected;
the user terminal 5 is composed of a fourth acousto-optic frequency shifter 27, a second Y-type optical coupler 28, a third faraday rotator mirror 29 and a fourth radio frequency source 30, wherein the 1 st and 2 nd optical ports and the radio frequency port of the fourth acousto-optic frequency shifter 27 are respectively connected with the 2 nd port of the second optical fiber link 4, the 1 st port of the second Y-type optical coupler 28 and the radio frequency port of the fourth radio frequency source 30, and the 2 nd and 3 rd ports of the second Y-type optical coupler 28 are respectively connected with the third faraday rotator mirror 29 and the user terminal input interface.
The first optical fiber link 2 and the second optical fiber link 4 are composed of optical fibers and bidirectional optical amplifiers.
The optical frequency transmission method using the cascaded optical frequency transmission device comprises the following specific steps:
1) optical frequency signal E to be transmitted at local end0＝cos[vt]After passing through the first Y-type optical coupler 10, the optical frequency signals are reflected for multiple times between the first faraday rotator 13 and the second faraday rotator 15, and after multiple reflections, the optical frequency signals reaching the photoelectric conversion unit 17 are:
where n is the number of times an optical frequency signal is reflected in said first optical fiber link 2, ωlAnd ωmRespectively, the radio frequency working frequency of the first acousto-optic frequency shifter 11 and the radio frequency working frequency, phi, of the second acousto-optic frequency shifter 14p1Phase noise, phi, introduced for unidirectional transmission in said first optical fibre link 2cTo compensate for phase;
2) said E1After passing through the first X-type optical coupler 16, the third acousto-optic frequency shifter 25 and the second optical fiber link 4, the signals received by the fourth acousto-optic frequency shifter 27 and the user end 5 can be represented as:
Er∝cos[v+(ωs+ωr+ωl+ωm)t+(φp1+φp2+φc)]
in the formula, ωsAnd ωrRespectively, the radio frequency operating frequency of said third acousto-optic frequency shifter 25 and the radio frequency operating frequency, phi, of said fourth acousto-optic frequency shifter 27p2Phase noise introduced for unidirectional transmission in said second optical fiber link 4;
3) said ErThe signal enters the photoelectric conversion unit 17 again through the second Y-type optical coupler 28, the fourth acousto-optic frequency shifter 27, the second optical fiber link 4, the third acousto-optic frequency shifter 25, and the first X-type optical coupler 16, and the signal entering the photoelectric conversion unit 17 can be represented as:
4) said E1And E2After the beat frequency of the photoelectric conversion unit 17, the following results are obtained:
5) said E3Passing through a center frequency of 2(ω)s+ωr) And 2(ω)l+ωm) The signals filtered by the first rf band-pass filter 18 and the second rf band-pass filter 19 are respectively:
E4∝cos[2(ωs+ωr)t+2φp2]，E5∝cos[2(ωl+ωm)t+2(φp1+φc)]；
6) said E4And E5After passing through the rf mixer 20, the upper sideband signal is taken out after passing through the third rf bandpass filter 21:
E6∝cos[2(ωs+ωr+ωl+ωm)t+2(φp1+φp2+φc)]；
7) the servo controller 23 will control the E6With the frequency 2(ω) output by said second RF source 22s+ωr+ωl+ωm) Comparing to obtain E6And a servo control algorithm is employed such that:
φc＝-(φp1+φp2)；
8) substituting the above formula into ErThe frequency received by the ue 5 can be expressed as:
Er′∝cos[v+(ωs+ωr+ωl+ωm)t]；
it can be seen that the phase noise introduced by the first and second optical fibre links 2, 4 is compensated for.
Experiments show that the cascading station 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, so that a user side obtains an optical frequency signal with stable phase, and the cascaded optical frequency transmission is realized. The invention can effectively improve the phase compensation bandwidth through the cascade optical fiber link, effectively reduces the system noise, and has the characteristics of simple system structure and high reliability.
Claims (3)
1. A cascaded optical frequency transmission device is characterized by comprising a local end (1), a first optical fiber link (2), a cascade station (3), a second optical fiber link (4) and a user end (5);
the local end (1) is composed of a first Y-shaped optical coupler (10), a first acousto-optic frequency shifter (11), a first radio frequency source (12) and a first Faraday rotator mirror (13), wherein a port 1, a port 2 and a port 3 of the first Y-shaped optical coupler (10) are respectively connected with a port 1 of the first acousto-optic frequency shifter (11), an optical frequency input port to be transmitted and the first Faraday rotator mirror (13), and a port 2 and a radio frequency interface of the first acousto-optic frequency shifter (11) are respectively connected with a port 1 of the first optical fiber link (2) and an output end of the first radio frequency source (12);
the cascade station (3) is composed of a second acousto-optic frequency shifter (14), a second Faraday rotation mirror (15), an X-type optical coupler (16), a photoelectric conversion unit (17), a first radio-frequency band-pass filter (18), a second radio-frequency band-pass filter (19), a radio-frequency mixer (20), a third radio-frequency band-pass filter (21), a second radio-frequency source (22), a servo controller (23), a voltage-controlled oscillator (24), a third acousto-optic frequency shifter (25) and a third radio-frequency source (26), wherein the 1 st and 2 nd optical ports of the second acousto-optic frequency shifter (14) are respectively connected with the 2 nd port of the first optical fiber link (2) and the 1 st port of the X-type optical coupler (16), and the 2 nd, 3 th and 4 th ports of the X-type optical coupler (16) are respectively connected with the optical port of the photoelectric conversion unit (17), the second Faraday rotation mirror (15), The 1 st optical port of the third acousto-optic frequency shifter (25) is connected, the output end of the photoelectric conversion unit (17) is respectively connected with the input end of the first radio frequency band-pass filter (18) and the input end of the second radio frequency band-pass filter (19), the 1 st, 2 nd input ends and the output ends of the radio frequency mixer (20) are respectively connected with the output end of the first radio frequency band-pass filter (18), the output end of the second radio frequency band-pass filter (19) and the input end of the third radio frequency band-pass filter (21), the output end of the third radio frequency band-pass filter (21) is connected with the 1 st radio frequency input port of the servo controller (23), the output end of the second radio frequency source (22) is connected with the 2 nd radio frequency input end of the servo controller (23), the output end of the servo controller (23) is connected with the input end of the voltage-controlled oscillator (24), the output end of the voltage-controlled oscillator (24) is connected with a radio frequency interface of a second acousto-optic frequency shifter (14), and a 2 nd optical port and a radio frequency interface of a third acousto-optic frequency shifter (25) are respectively connected with a 1 st port of the second optical fiber link (4) and a radio frequency port of a third radio frequency source (26);
user side (5) constitute by fourth reputation frequency shifter (27), second Y type optical coupler (28), third Faraday rotating mirror (29) and fourth radio frequency source (30), the 1 st, 2 nd optical port, the radio frequency port of fourth reputation frequency shifter (27) respectively with second fiber link (4)2 ports 1 port of second Y type optical coupler (28) the radio frequency port of fourth radio frequency source (30) link to each other, 2, 3 ports of second Y type optical coupler (28) respectively with third Faraday rotating mirror (29), user side input interface link to each other.
2. The cascaded optical frequency transfer device of claim 1, wherein the first fiber link (2) and the second fiber link (4) are comprised of optical fibers, bi-directional optical amplifiers.
3. An optical frequency transfer method using the cascaded optical frequency transfer device of claim 1, the method comprising the steps of:
1) optical frequency signal E to be transmitted at local end0＝cos[vt]Passing through the first Y-shaped optical coupler(10) Then, the optical frequency signals reaching the photoelectric conversion unit (17) after multiple reflections are reflected for multiple times between the first Faraday rotator mirror (13) and the second Faraday rotator mirror (15):
where n is the number of times an optical frequency signal is reflected in said first optical fiber link (2), ωlAnd ωmRespectively the radio frequency working frequency of the first acousto-optic frequency shifter (11) and the radio frequency working frequency, phi, of the second acousto-optic frequency shifter (14)p1Phase noise, phi, introduced for unidirectional transmission in said first optical fiber link (2)cTo compensate for phase;
2) said E1After passing through the X-type optical coupler (16), the third acousto-optic frequency shifter (25) and the second optical fiber link (4), the signals received by the fourth acousto-optic frequency shifter (27) and the user end (5) can be represented as:
Er∝cos[ν+(ωs+ωr+ωl+ωm)t+(φp1+φp2+φc)]
in the formula, ωsAnd omegarRespectively the radio frequency working frequency, phi, of the third acousto-optic frequency shifter (25) and the fourth acousto-optic frequency shifter (27)p2Phase noise introduced for unidirectional transmission in said second optical fiber link (4);
3) said ErAnd the signal enters the photoelectric conversion unit (17) again through the second Y-type optical coupler (28), the fourth acousto-optic frequency shifter (27), the second optical fiber link (4), the third acousto-optic frequency shifter (25) and the first X-type optical coupler (16), and the signal entering the photoelectric conversion unit (17) can be represented as follows:
4) said E1And E2After the beat frequency of the photoelectric conversion unit (17), the following results are obtained:
5) said E3Passing through a center frequency of 2(ω)s+ωr) And 2(ω)l+ωm) The signals filtered by the first radio frequency band-pass filter (18) and the second radio frequency band-pass filter (19) are respectively as follows:
E4∝cos[2(ws+ωr)t+2φp2]，E5∝cos[2(ωl+ωm)t+2(φp1+φc)]；
6) said E4And E5After passing through the radio frequency mixer (20), the upper sideband signal is taken out after passing through the third radio frequency band pass filter (21):
E6∝cos[2(ωs+ωr+ωl+ωm)t+2(φp1+φp2+φc)]；
7) said servo controller (23) sends said E6With the frequency 2(ω) output by said second radio source (22)s+ωr+ωl+ωm) Comparing to obtain E6And a servo control algorithm is employed such that:
φc＝-(φp1+φp2)；
8) substituting the above formula into ErThe frequency received by the user terminal (5) can be expressed as:
Er′∝cos[ν+(ωs+ωr+ωl+ωm)t]；
phase noise introduced by the first (2) and second (4) optical fiber links is compensated.
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| 高精度时间频率信号光纤传输和复原技术的研究;江贤峰;《全球定位系统》;20160415;全文 * |
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