CN108282227B - Phase conjugation-based phase-stable distribution system for quadruple frequency signal optical fiber at any point - Google Patents
Phase conjugation-based phase-stable distribution system for quadruple frequency signal optical fiber at any point Download PDFInfo
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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
- H04B10/25—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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- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
- H04B10/50597—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the phase of the modulating signal
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- H—ELECTRICITY
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6162—Compensation of polarization related effects, e.g., PMD, PDL
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
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- H—ELECTRICITY
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- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
Abstract
The invention provides a phase conjugation-based quadruple frequency signal optical fiber random point phase-stabilized distribution system, which belongs to the technical field of optical fiber phase-stabilized distribution and comprises an annular optical fiber link structure, a phase-stabilized distribution system and a phase-stabilized distribution system, wherein the annular optical fiber link structure mainly comprises 1 local end, n remote end stations, n +1 sections of optical fiber links and n optical fiber couplers; the local station comprises a microwave source, a double-carrier optical signal generating module, a phase conjugate optical signal generating module, an optical fiber coupler, a first photoelectric detector and an optical fiber circulator; each remote station includes an electro-optical mixing module, an optical amplifier, a second photodetector, an electrical amplifier, and an electrical filter. The main device used by the system is a photonic device, and due to the high-frequency broadband characteristic of the photonic device, the system can realize the optical fiber remote stable phase distribution of higher-frequency signals, and effectively avoids the deterioration of phase stability precision caused by local oscillator leakage and harmonic interference introduced when an electric mixer is used.
Description
Technical Field
The invention belongs to the technical field of optical fiber phase-stabilizing distribution, and particularly relates to a phase conjugation-based phase-stabilizing distribution system for an arbitrary point of a quadruple frequency signal optical fiber.
Background
In application systems with high requirements on time-frequency accuracy, such as high-energy particle accelerators and Very Long Baseline Interference (VLBI) antenna arrays, the ultra-stable radio frequency signal optical fiber distribution system gradually becomes a more competitive radio frequency signal distribution system due to the advantages of lower transmission loss, larger bandwidth, higher reliability, electromagnetic interference resistance and the like. However, due to temperature variation and mechanical disturbance of the surrounding environment of the optical fiber, fluctuation of the optical fiber delay is caused, which in turn causes phase jitter of the distributed rf signal and deteriorates the quality of the remote received signal. The optical fiber phase-stabilizing distribution system mainly studies how to eliminate and compensate phase jitter caused by optical fiber delay jitter. Currently, the main compensation techniques of the optical fiber phase-stabilized distribution system include: active phase compensation techniques and passive phase compensation techniques. Active phase compensation techniques utilize a feedback loop to control the compensator to achieve phase stabilization. This technique can achieve high compensation accuracy, but its response speed is slow and phase recovery time is long. Another compensation technique, a passive phase compensation technique based on frequency mixing, can achieve fast and large dynamic range phase fluctuation compensation while avoiding complex phase error detection and feedback circuits.
Passive phase compensation techniques have been extensively studied, with applications in point-to-multipoint branched or ring topology time-frequency distribution systems. In a branch type system, a multi-wavelength technique is generally adopted to distinguish different access stations, but as the number of access stations increases, the wavelength interval between a local station and an access station increases, so that group delay fluctuation caused by temperature change inevitably affects the stability of the system. The ring fiber distribution system can avoid the group delay fluctuation caused by temperature. Referring to fig. 1, an existing ring-type optical fiber phase-stabilized distribution system is shown, which mainly includes a ring-type optical fiber link structure composed of 1 local end, n remote stations, n +1 segments of optical fiber links, and n 2x2 optical fiber couplers 105, and is described by taking an example in which a local station distributes a frequency-doubled signal to a remote station n. Microwave signals generated by the microwave source 112 are divided into two paths, one path enters the frequency tripler 110 to generate frequency tripled signals, and the other path is modulated on optical carriers generated by the laser 101 by the modulator 102 through the electric coupler 111; the modulated optical signal enters the fiber coupler 103 and is divided into two branches: one branch travels counterclockwise to the remote station over the first length of optical fiber 104 and back to the local station along the second length of optical fiber 106. The optical signal returned to the local station enters the photoelectric detector 108 through the optical fiber circulator 107, the obtained electrical signal and the triple frequency signal generated by the triple frequency multiplier 110 are mixed through the electric mixer 109 to obtain a double frequency signal, the double frequency signal is modulated onto an optical carrier by the modulator 102 and is transmitted to the remote station through the optical fiber 104, and the phase conjugation double frequency signal is obtained after the detection of the detector 113 and the filtering of the electric filter 115 at the remote station; and the optical signal of the other branch passes through the optical fiber circulator 107 and then passes through the optical fiber 106 and the first optical fiber coupler 119 in the clockwise direction to reach the remote station 1, and then passes through the optical fiber 120 and the second optical fiber coupler 105 to reach the remote station n, and after the remote station n passes through the detector 114 and the electrical filter 116, the forward-transmitted double-frequency electrical signal is obtained. The frequency-doubled signal and the phase-conjugated frequency-doubled signal are mixed by the electric mixer 117 and then enter the quadruple frequency divider 118 to obtain a stably transmitted radio frequency signal.
In the above ring optical fiber arbitrary point distribution system, in order to realize frequency mixing, it is necessary to use the electrical mixers 109 and 117 and the electrical frequency multiplier 110, and these devices may generate local oscillation leakage, harmonic waves and image interference in practical use, which reduces the accuracy of phase stabilization.
Disclosure of Invention
The invention provides a phase-conjugation-based quadruple frequency signal optical fiber random-point phase-stabilizing distribution system, which aims at solving the problem that local oscillator leakage and harmonic interference introduced by an electric mixer in the conventional passive phase compensation-based optical fiber radio frequency phase-stabilizing distribution system can reduce the phase-stabilizing precision.
In order to realize the purpose of the invention, the following technical scheme is adopted:
a phase conjugation-based quadruple frequency signal optical fiber random point phase-stable distribution system comprises a ring optical fiber link structure which is mainly composed of 1 local station, n remote stations, n +1 sections of optical fiber links and n 2x2 type optical fiber couplers (218); the local station is characterized by comprising a microwave source (206), a dual-carrier optical signal generation module (201), a phase conjugate optical signal generation module (209), a 1x2 type optical fiber coupler (207), a first photoelectric detector (208) and an optical fiber circulator (216); each remote station comprises an electro-optical frequency mixing module (223), a first optical amplifier (221), a second photodetector (222), a first electrical amplifier (231) and a first electrical filter (232); wherein the content of the first and second substances,
the output end of the microwave source (206) is connected with the electrical signal input end of the dual-carrier optical signal generation module (201); the dual-carrier optical signal generation module (201) is used for generating optical signals with adjustable central wavelength and dual-carrier frequency interval, the output end of the dual-carrier optical signal generation module (201) forms 2 branches through a 1x2 type optical fiber coupler (207), the output end of a first branch is connected with the electrical signal input end of the phase conjugate optical signal generation module (209) through a first photoelectric detector (208), the output end of a second branch is connected with a 2 port of the optical fiber circulator (216) after forming a ring-shaped optical fiber link structure through a corresponding optical fiber link, and a 1 port and a 3 port of the optical fiber circulator are respectively connected with the phase conjugate optical signal output end and the optical signal input end of the phase conjugate optical signal generation module (209); the frequency of the input frequency-doubled electrical signal of the phase conjugate optical signal generation module (209) is equal to the frequency interval of two optical carriers of the optical signal detected by the first photodetector (208), and is used for generating a phase conjugate optical signal;
each remote station is accessed to any point in the ring optical fiber link through 12 x2 type optical fiber coupler; in each remote station, the a port of the 2x2 type optical fiber coupler connected with the remote station is connected with the optical signal input end of the electro-optical mixing module (223) in the remote station, and the b port of the 2x2 type optical fiber coupler is connected with the input end of the first optical amplifier (221); the output end of the first optical amplifier (221) is connected with the electrical signal input end of the electro-optical frequency mixing module (223) through a second photoelectric detector (222), the electrical signal output end of the electro-optical frequency mixing module (223) is connected with a first electrical filter (232) through a first electrical amplifier (231), and the first electrical filter (232) outputs a stable quadruple frequency signal;
the dual-carrier optical signal generation module (201) comprises a laser (202), a first polarization controller (203), a first electro-optical modulator (204) and a first tunable optical filter (205); the output end of the laser (202) is connected with the input end of a first electro-optical modulator (204) through a first polarization controller (203), the output end of the first electro-optical modulator (204) is connected with the input end of a first tunable optical filter (205), and the first tunable optical filter (205) outputs a dual-frequency optical carrier signal;
the phase conjugate optical signal generation module (209) comprises a second electrical amplifier (210), a second electrical filter (211), a second optical amplifier (212), a second polarization controller (213), a second electro-optical modulator (214) and a second tunable optical filter (215); wherein the electrical signal input end of the phase conjugate optical signal generating module (209) is connected with the electrical signal input end of the second electro-optical modulator (214) through a second electrical amplifier (210) and a second electrical filter (211) in sequence; the optical signal input end of the phase conjugation optical signal generation module (209) is connected with the optical signal input end of a second electro-optical modulator (214) through a second optical amplifier (212) and a second polarization controller (213) in sequence; the optical signal output end of the second electro-optical modulator (214) is connected with the input end of a second tunable optical filter (215), and the output end of the second tunable optical filter (215) outputs a phase conjugate optical signal;
the electro-optical mixing module (223) comprises a third electrical amplifier (224), a third electrical filter (225), a third optical amplifier (226), a third polarization controller (227), a third electro-optical modulator (228), an optical filter (229) and a third photodetector (230); wherein the electrical signal input end of the electro-optical frequency mixing module (223) is connected with the electrical signal input end of a third electro-optical modulator (228) through a third electrical amplifier (224) and a third electrical filter (225) in sequence; the optical signal input end of the electro-optical frequency mixing module (223) is connected with the optical signal input end of a third electro-optical modulator (228) through a third optical amplifier (226) and a third polarization controller (227) in sequence; the optical signal output end of the third electro-optical modulator (228) outputs the mixed electric signal after passing through an optical filter (229) and a third photodetector (230).
Preferably, the first electro-optic modulator (204) employs a mach-zehnder modulator biased at a minimum transmission point.
Preferably, the second electro-optic modulator (214) employs dual parallel modulators biased at a minimum transmission point.
Preferably, the third electro-optic modulator (228) employs a mach-zehnder modulator biased at a linear operating point.
The invention has the characteristics and beneficial effects that:
1. compared with the prior passive phase compensation system, the system has the advantages that the main devices used by the system are photonic devices, electronic devices such as an electric mixer and a frequency multiplier are not used, and an electric amplifier and an electric filter are auxiliary devices, so that the corresponding effect is achieved, and the system is an all-optical radio frequency signal optical fiber phase-stabilizing distribution system. Due to the high-frequency broadband characteristic of the photonic device, the system can realize the optical fiber remote stable phase distribution of higher-frequency signals, and can avoid the deterioration of phase stability precision caused by local oscillator leakage and harmonic interference introduced when an electric mixer is used.
2. The system of the invention is accessed to a remote station at any point of an optical fiber ring link, and the remote station based on the all-photonic device can receive stable quadruple frequency signals.
3. The system is an all-optical stable phase distribution system, only needs one laser and a simple photoelectric device, and has the advantages of simple and compact structure, low cost and the like.
4. The system simultaneously realizes quadruple frequency and stable phase distribution of radio frequency signals, and the adopted photon frequency doubling technology can not be limited by bandwidth frequency of the device, so that the system can realize stable transmission of high-frequency millimeter wave signals by using a low-frequency microwave device with lower price and better performance.
5. The system only uses one optical wavelength in the optical fiber ring link, so that the bidirectional transmission has good symmetry, and the influence of group delay fluctuation caused by temperature change on phase stability is avoided.
Drawings
FIG. 1 is a block diagram of a conventional ring fiber phase-stabilized distribution system;
FIG. 2 is a block diagram of a phase-conjugate-based quadrature signal fiber arbitrary point phase-stable distribution system according to the present invention;
fig. 3 is a schematic diagram of phase change of dual-frequency optical signals before and after modulation in a phase conjugate optical signal generation module of the phase-stabilized distribution system according to the present invention;
FIG. 4 is a block diagram of the architecture of an embodiment of the present invention;
FIG. 5 is a graph of test results for the embodiment of FIG. 4, where (a) of FIG. 5 is an eye test result for a frequency doubled signal without phase stability compensation, and (b) of FIG. 5 is an eye test result for a frequency quadrupled signal with compensation;
fig. 6 is a graph showing the results of the signal delay fluctuation test performed in the embodiment shown in fig. 4.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings and the specific embodiments as follows:
the invention provides a phase conjugation-based quadruple frequency signal optical fiber random point phase-stable distribution system, which has a structure shown in figure 2. The distribution system mainly comprises 1 local end, n (the value range of n can be determined according to specific application requirements, theoretically, has no upper limit) remote stations, an n +1 section of optical fiber link and n 2x2 type optical fiber couplers 218 to form a ring optical fiber link structure, wherein the local station comprises a microwave source 206, a double-carrier optical signal generation module 201, a phase conjugate optical signal generation module 209, a 1x2 type optical fiber coupler 207, a first photoelectric detector 208 and an optical fiber circulator 216; each remote station includes an electro-optical mixing module 223, an optical amplifier 221, a second photodetector 222, an electrical amplifier 231, and an electrical filter 232, respectively.
The connection relationship of each device is as follows:
the output of the microwave source 206 is connected to the electrical signal input of the dual-carrier optical signal generation module 201. The dual-carrier optical signal generating module 201 is configured to generate optical signals with adjustable central wavelength and dual carrier frequency intervals, an output end of the dual-carrier optical signal generating module 201 forms 2 branches through a 1x 2-type optical fiber coupler 207, a first branch output end is connected to an electrical signal input end of the phase conjugate optical signal generating module 209 through a first photodetector 208, a second branch output end is connected to a port 2 of the optical fiber circulator 216 after forming a ring-shaped optical fiber link structure through corresponding optical fiber links 217, 219, and 233 (taking two remote stations as examples), and the port 1 and the port 3 of the optical fiber circulator 216 are connected to a phase conjugate optical signal output end and an optical signal input end of the phase conjugate optical signal generating module 209, respectively; the frequency of the double frequency electrical signal input by the phase conjugate optical signal generation module 209 is equal to the frequency interval of the two optical carriers of the detected optical signal by the first photodetector 208, and is used for generating the phase conjugate optical signal. Each remote station is accessed to any point in the ring fiber link by 1 fiber optic coupler 218, 220 of the 2x2 type (two remote stations are examples). Taking the remote station 1 as an example, the a port of the 2x2 type fiber coupler 218 connected thereto is connected to the optical signal input end of the electro-optical mixing module 223 of the remote station 1, and the b port is connected to the input end of the optical amplifier 221; the output end of the optical amplifier 221 is connected to the electrical signal input end of the electro-optical mixing module 223 through the second photodetector 222, and the electrical signal output end of the electro-optical mixing module 223 is connected to the electrical filter 232 through the electrical amplifier 231, so as to output a stable quadruple frequency signal.
The local station 1 of the present invention uses the dual-frequency optical carrier signal generated by the dual-frequency optical carrier module 201, and can generate a double-frequency signal through the first photodetector 208, and after going back and forth through the optical fiber link and passing through the phase conjugate signal generating module 209, a phase conjugate double-frequency signal can be obtained at the remote station, and a phase-stable quadruple frequency signal can be obtained by passing the phase conjugate double-frequency signal and the forward transmitted double-frequency signal through the frequency mixing module (electrical frequency mixing or optical frequency mixing). The specific signal allocation process is as follows:
at the local station, the microwave source 206 generates a microwave signal V to be distributed1And serves as an input electrical signal for the dual carrier optical signal module 201. The dual-carrier optical signal generating module 201 generates a dual-frequency optical carrier signal E1. The signal is divided into two branches by a 1x2 type optical fiber coupler 207, one branch generates a frequency-doubled radio frequency signal V by a first photodetector 2082As an input electrical signal of the phase conjugate optical signal generation module 209; forward transmitting optical signal E of another branch1The optical fiber is used as a d port input signal of a 2x2 type optical fiber coupler 218 through an optical fiber link 217, the output of the 2x2 type optical fiber coupler 218 is divided into two parts, and an output port a outputs an optical signal E containing optical fiber time delay fluctuation2The output port c output signal passes through fiber link 219 and other remote stations, fiber links, and serves as the input signal at port 2 of the local station fiber circulator 216. The signal passes through port 3 of the fiber circulator 216 and then serves as an input optical signal of the phase conjugate optical signal generation module. Phase conjugationPhase conjugate optical signal E generated by optical signal generating module4Back along fiber links 233,219 via port 1 of fiber circulator 216 to remote station 1, and optical signal E is obtained from port b of 2x2 type fiber coupler 2185The signal passes through the optical amplifier 221 and the second photodetector 222 to obtain a phase conjugate electrical signal V3And serves as an input electrical signal for the electro-optical mixing module. V3And E2After the frequency-mixing module 223, the electric amplifier 231 and the electric filter 232, a stable quadruple frequency signal V is obtained4。
With reference to fig. 2, the specific implementation and functions of each component module of the present invention are described as follows:
the dual carrier optical signal generation module 201 includes: a laser 202, a bias controller 203, an electro-optic modulator 204 and a tunable optical filter 205. The output end of the laser 202 is connected with the input end of the electro-optical modulator 204 through the polarization controller 203, and the output end of the electro-optical modulator 204 is connected with the input end of the tunable optical filter 205. The output end of the tunable optical filter 205 outputs a dual-frequency optical carrier signal E1. The module is used for generating a dual-frequency optical carrier signal, and the generated optical signal has the characteristic of adjustable central wavelength and dual-carrier frequency interval. The module may be implemented using other electro-optic devices.
The phase conjugate optical signal generation module 209 includes: an electrical amplifier 210 and an electrical filter 211 connected to each other, and an optical amplifier 212, a polarization controller 213, an electro-optical modulator 214 and an adjustable optical filter 215 connected to each other in this order; wherein the electrical signal input of the module 209 is connected to the electrical signal input of the electro-optical modulator 214 via an electrical amplifier 210 and an electrical filter 211 in sequence; the optical signal input end of the module 209 is connected with the optical signal input end of the electro-optical modulator 214 through the optical amplifier 212 and the polarization controller 213 in sequence; the optical signal output terminal of the electro-optical modulator 214 is connected to the input terminal of the tunable optical filter 215, and the phase conjugate optical signal E output from the output terminal of the tunable optical filter 2154. The first branch passing through the fiber coupler 207 generates a frequency-doubled RF signal V via the first photodetector 2082The second branch is transmitted via the optical fibre loop link and returned to the local station as an offsetThe modulator 214 with the minimum transmission point inputs the optical signal modulated by the electrical signal with the double frequency outputted from the electrical filter 211, and the phase of the dual-frequency optical signal before and after modulation is changed as shown in fig. 3 due to the optical carrier signal E3Is equal to the frequency interval of the double frequency signal V2Frequency, hence modulated probe optical signal E4With unmodulated probe optical signal E3Phase of the carried radio frequency signal
Are conjugate to each other, i.e. the phase conjugation of the signals is realized by the phase conjugation optical signal generating module 209.
The electro-optical mixing module 223 includes: an electrical amplifier 224 and an electrical filter 225 connected to each other, and an optical amplifier 226, a polarization controller 227, an electro-optical modulator 228, an optical filter 229 and a photodetector 230 connected in sequence; wherein the electrical signal input of the module 223 is connected to the electrical signal input of the electro-optical modulator 228 via an electrical amplifier 224 and an electrical filter 225, in that order; the optical signal input end of the module 223 is connected with the optical signal input end of the electro-optical modulator 228 through the optical amplifier 226 and the polarization controller 227 in sequence; the mixed electrical signal is generated at the optical signal output of the electro-optic modulator 228 via the optical filter 229 and the photodetector 230. The module realizes phase conjugate electric signal V3And optical signal E2And mixing the frequency, and detecting the mixed optical signal to obtain an electric signal.
Examples and their validation of the effects:
an embodiment of the invention is shown in figure 4. The system of the invention exemplarily shows the phase-stable distribution of 20GHz radio frequency signals, but the system can be applied to higher frequency bands, and only a device and a test instrument with higher frequency are used instead. In order to test the performance of the system of the present invention, a test module oscilloscope 334, a tunable fiber delay line 308, and an optical isolator 310 were added to the example. In addition, in order to stabilize the bias voltage of the electro- optical modulators 304, 319, 327, a bias voltage control module 305, 321, 330 is added in the embodiment. This embodiment takes an arbitrary remote station as an example, and the specific implementation is as follows:
a tunable laser 302 generates an optical carrier wave at a wavelength of 1550.240nm, whose polarization state is controlled by a polarization controller 303, into a mach-zehnder modulator 304 biased at a minimum transmission point. The bias voltage of the mach-zehnder modulator 304 is controlled by a control module 305. The optical carrier is modulated by the 5GHz microwave signal generated by the microwave source 301, and the modulated optical signal enters the first tunable optical filter 306. Adjusting the center wavelength and bandwidth of the tunable optical filter, and filtering the input optical signal to obtain a dual-frequency optical carrier signal E1. The dual-frequency optical carrier signal E1Is divided into two branches by a 1x2 type fiber coupler 307: one branch passes through a first photoelectric detector 313 with the bandwidth of 12GHz, an electric amplifier 314 with the gain of 40dB and an electric filter 315 with the center frequency of 10GHz to obtain an electric signal of 10 GHz; the other branch enters a first section of 10km single mode fibre 309 via a tuneable fibre delay line 308. The output of the single mode fiber 309 is connected to a 2x2 mode fiber coupler 311 via an optical isolator 310. The fiber coupler 311 couples out a portion of the optical signal as a forward transmission optical signal to the remote station; another portion of the optical signal is returned to the local station via a second 10km section of single mode optical fibre 312. The other optical signal passes through the optical fiber circulator 316, enters the optical amplifier 317 for amplification, then enters the dual-parallel modulator 319 after the polarization state of the optical signal is controlled by the polarization controller 318, and is modulated by the 10GHz electrical signal generated by the first branch after passing through the 1x2 type optical fiber coupler 307, and the dual-parallel modulator 319 is biased at the minimum transmission point by the bias point control module 321. The dual parallel modulator 319 outputs an optical signal to enter the second tunable optical filter 320, and the center frequency and bandwidth of the filter are adjusted to obtain a phase conjugate optical signal E4. The phase conjugate optical signal is transmitted back to the remote station via a fiber circulator 316, a second section of 10km single mode fiber 312 and a 2x2 type fiber coupler 311. The phase conjugate optical signal returned to the remote station enters an optical amplifier 322 for amplification, which produces a phase conjugate 10GHz electrical signal after passing through a second photodetector 325 with a bandwidth of 12GHz, an electrical amplifier 326 with a gain of 40dB, and an electrical filter 328 with a center frequency of 10 GHz. The 10GHz electrical signal is mixed electro-optically with the forward propagating optical signal after passing through the optical amplifier 323 and the polarization controller 324 by the mach-zehnder modulator 327. Mach Zehnder modulationThe controller 327 is biased at a linear operating point by the bias voltage control module 330. The mixed optical signal passes through an optical bandpass filter 331, a photodetector 332, a 30dB gain electrical amplifier 333 and an electrical filter 329 with a center frequency of 20GHz to obtain a stably distributed 20GHz signal.
The frequency doubled signal output by electrical filter 328 and the frequency quadrupled signal output by electrical filter 329 are tested using test oscilloscope 334, the trigger signal of oscilloscope 334 being provided by the 5GHz signal generated by microwave source 301.
In the embodiment, eye pattern tests were performed on the frequency-doubled signal without phase stability compensation and the frequency-quadrupled signal with compensation, and the test results are shown in fig. 5 (a) and 5 (b). It can be seen that the uncompensated signal suffers from severe phase drift, i.e. the superimposed eye pattern waveform is wide; after the phase fluctuation compensation based on the optical microwave phase conjugation, the eye pattern of the quadruple frequency signal is not deteriorated and is not influenced by the optical fiber time delay fluctuation. The time delay fluctuation test of the signal is performed according to the phase-stable distribution system shown in fig. 4. The test time is 1 hour, and the delay variation of the signal without phase compensation and the compensated quadruple frequency signal within one hour are respectively tested. During testing, the 5GHz signal output by the microwave source is used as a trigger signal of the sampling oscilloscope, and the sampling oscilloscope is used to record the time delay changes of the signal at different moments, and the result is shown in fig. 6. The left ordinate axis in fig. 6 corresponds to the uncompensated signal at 10GHz and the right ordinate axis corresponds to the compensated signal at 20 GHz. It can be seen that the variation in the delay of the uncompensated signal over an hour is approximately 180 ps. After phase fluctuation compensation, the time delay fluctuation of the quadruple frequency signal is within +/-2 ps, which corresponds to root mean square time delay of 0.86ps, and the method has obvious compensation effect and can stabilize optical fiber time delay jitter caused by temperature change.
It should be understood that the description of the present invention in the foregoing description and description is intended to be illustrative rather than limiting and that various changes, modifications, and/or alterations to the embodiments described above may be made without departing from the invention as defined by the appended claims.
Claims (4)
1. A phase conjugation-based quadruple frequency signal optical fiber random point phase-stable distribution system comprises a ring optical fiber link structure which is mainly composed of 1 local station, n remote stations, n +1 sections of optical fiber links and n 2x2 type optical fiber couplers (218); the local station is characterized by comprising a microwave source (206), a dual-carrier optical signal generation module (201), a phase conjugate optical signal generation module (209), a 1x2 type optical fiber coupler (207), a first photoelectric detector (208) and an optical fiber circulator (216); each remote station comprises an electro-optical frequency mixing module (223), a first optical amplifier (221), a second photodetector (222), a first electrical amplifier (231) and a first electrical filter (232); wherein the content of the first and second substances,
the output end of the microwave source (206) is connected with the electrical signal input end of the dual-carrier optical signal generation module (201); the dual-carrier optical signal generation module (201) is used for generating optical signals with adjustable central wavelength and dual-carrier frequency interval, the output end of the dual-carrier optical signal generation module (201) forms 2 branches through a 1x2 type optical fiber coupler (207), the output end of a first branch is connected with the electrical signal input end of the phase conjugate optical signal generation module (209) through a first photoelectric detector (208), the output end of a second branch is connected with a 2 port of the optical fiber circulator (216) after forming a ring-shaped optical fiber link structure through a corresponding optical fiber link, and a 1 port and a 3 port of the optical fiber circulator are respectively connected with the phase conjugate optical signal output end and the optical signal input end of the phase conjugate optical signal generation module (209); the frequency of the input frequency-doubled electrical signal of the phase conjugate optical signal generation module (209) is equal to the frequency interval of two optical carriers of the optical signal detected by the first photodetector (208), and is used for generating a phase conjugate optical signal;
each remote station is accessed to any point in the ring optical fiber link through 12 x2 type optical fiber coupler; in each remote station, the a port of the 2x2 type optical fiber coupler connected with the remote station is connected with the optical signal input end of the electro-optical mixing module (223) in the remote station, and the b port of the 2x2 type optical fiber coupler is connected with the input end of the first optical amplifier (221); the output end of the first optical amplifier (221) is connected with the electrical signal input end of the electro-optical frequency mixing module (223) through a second photoelectric detector (222), the electrical signal output end of the electro-optical frequency mixing module (223) is connected with a first electrical filter (232) through a first electrical amplifier (231), and the first electrical filter (232) outputs a stable quadruple frequency signal;
the dual-carrier optical signal generation module (201) comprises a laser (202), a first polarization controller (203), a first electro-optical modulator (204) and a first tunable optical filter (205); the output end of the laser (202) is connected with the input end of a first electro-optical modulator (204) through a first polarization controller (203), the output end of the first electro-optical modulator (204) is connected with the input end of a first tunable optical filter (205), and the first tunable optical filter (205) outputs a dual-frequency optical carrier signal;
the phase conjugate optical signal generation module (209) comprises a second electrical amplifier (210), a second electrical filter (211), a second optical amplifier (212), a second polarization controller (213), a second electro-optical modulator (214) and a second tunable optical filter (215); wherein the electrical signal input end of the phase conjugate optical signal generating module (209) is connected with the electrical signal input end of the second electro-optical modulator (214) through a second electrical amplifier (210) and a second electrical filter (211) in sequence; the optical signal input end of the phase conjugation optical signal generation module (209) is connected with the optical signal input end of a second electro-optical modulator (214) through a second optical amplifier (212) and a second polarization controller (213) in sequence; the optical signal output end of the second electro-optical modulator (214) is connected with the input end of a second tunable optical filter (215), and the output end of the second tunable optical filter (215) outputs a phase conjugate optical signal;
the electro-optical mixing module (223) comprises a third electrical amplifier (224), a third electrical filter (225), a third optical amplifier (226), a third polarization controller (227), a third electro-optical modulator (228), an optical filter (229) and a third photodetector (230); wherein the electrical signal input end of the electro-optical frequency mixing module (223) is connected with the electrical signal input end of a third electro-optical modulator (228) through a third electrical amplifier (224) and a third electrical filter (225) in sequence; the optical signal input end of the electro-optical frequency mixing module (223) is connected with the optical signal input end of a third electro-optical modulator (228) through a third optical amplifier (226) and a third polarization controller (227) in sequence; the optical signal output end of the third electro-optical modulator (228) outputs the mixed electric signal after passing through an optical filter (229) and a third photodetector (230).
2. The system according to claim 1, wherein the first electro-optical modulator (204) is a Mach-Zehnder modulator biased at a minimum transmission point.
3. The arbitrary-point phase-stable distribution system for quadruple frequency signals according to claim 1, wherein the second electro-optical modulator (214) is a double-parallel modulator biased at the minimum transmission point.
4. The arbitrary-point phase-stable distribution system for quadruple frequency signals according to claim 1, wherein the third electro-optical modulator (228) is a mach-zehnder modulator biased at a linear operating point.
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