CN117220119A - Low-frequency drift single-mode photoelectric oscillator based on all-optical microwave phase conjugation - Google Patents
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Abstract
The invention provides a single-mode photoelectric oscillator with low frequency drift based on all-optical microwave phase conjugation, which is based on an all-optical microwave phase conjugation passive compensation principle and a nonlinear double-ring vernier effect mode selection technology. On the one hand, compared with the photoelectric oscillator using the linear symmetrical double-ring vernier effect mode selection, the scheme of the photoelectric oscillator not only can realize higher side mode rejection ratio, but also can bring higher amplitude stability to the output mode of the photoelectric oscillator. On the other hand, the use of the all-optical microwave phase conjugation passive compensation technology ensures the stable frequency of the photoelectric oscillator, and simultaneously can avoid the drag of an external radio frequency source on near carrier phase noise in the injection locking technology, thereby overcoming the dependence on the external source with low phase noise. The photoelectric oscillator can perform frequency stabilization output while single-mode oscillation, and overcomes the defects of the traditional scheme in mode selection and mode frequency stabilization.
Description
Technical field:
the invention provides a single-mode photoelectric oscillator based on stable frequency output of all-optical phase conjugate passive compensation, and relates to the field of high-quality radio frequency signal generation research.
The background technology is as follows:
microwave sources are a key component of many disciplines, such as radar, communication, sensing, testing, and measurement. It is hopeful to provide high-frequency carrier for radar and wireless communication, high-speed clock for wired communication and local oscillator for test instrument. In particular, the long-term frequency stability and short-term phase noise of a microwave source are two key indicators in an application. Photon-based opto-electronic oscillators can overcome the phase noise limitations of pure electronic oscillators at high frequencies, and are good candidates for generating high spectral purity microwave or millimeter wave signals. By using long fibers in the tank circuit, the optoelectronic oscillator exhibits excellent short term phase noise performance. However, due to the temperature dependence of the effective refractive index of the optical fiber, the main mode frequency of the optoelectronic oscillator drifts with ambient temperature. In addition, the free spectral range is narrowed by the long optical fiber, so suppression of side mode spurious near the main mode becomes difficult because of the difficulty in manufacturing extremely narrow high quality factor filters in the high frequency band.
In recent years, stable phase transmission of microwave signals based on the phase compensation principle has been proposed and widely discussed, and is mainly divided into active compensation and passive compensation. The active compensation scheme is to carry out real-time compensation, correction and cancellation of phase jitter on signals by carrying out phase detection and compensation algorithm on the signals, but the compensation bandwidth and frequency band of the active compensation scheme are severely limited by a compensation electric device, and meanwhile, additional noise is introduced to reduce the frequency stability of the system; the passive compensation scheme is to perform conjugate inversion processing on the phase offset of the received signal by means of a mixer and a frequency multiplier, so that the phase offset is transmitted back to the far end to realize cancellation of phase jitter, thereby overcoming the limitation of the bandwidth of an electric device, and having a simple structure. The drift compensation of the output frequency of the photoelectric oscillator is similar to the phase compensation in the stable phase transmission of the microwave signal, and comprises two types of active compensation and passive compensation, and the active compensation scheme adopts a phase-locked loop to detect and then compensate, but is limited by the bandwidth and the frequency band of the compensating electric device, and the passive compensation scheme adopts the mode of injecting an external stable radio frequency source into the compensation loop to lock the photoelectric oscillator and the injected radio frequency source, so that the low-frequency drift output is realized. But this scheme is limited by the phase noise of the external injection source.
In addition, single-mode oscillation of the photoelectric oscillator is widely studied, and the mode selection method mainly comprises injection locking, multi-resonant cavity vernier effect, space time symmetry and other methods, wherein the multi-resonant cavity vernier effect is widely studied due to good stability, the dependence on an external radio frequency source is overcome, and the nonlinear double-ring performance is optimal, because the nonlinear double-ring oscillator has higher side-mode rejection ratio and more stable power of an output cavity mode.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a single-mode photoelectric oscillator with low frequency drift based on all-optical microwave phase conjugation, as shown in figure 1.
The system scheme shown in fig. 1 is based on an all-optical microwave phase conjugation photoelectric oscillator, and comprises an all-optical microwave phase conjugation part and a frequency multiplication photoelectric oscillator part; wherein,
the all-optical microwave phase conjugation part is composed of a second optical circulator 105, a second electro-optical modulator 106, a first optical filter 112, a second photodetector 113 and a second electric band-pass filter 114;
the frequency doubling opto-electronic oscillator section comprises, in addition to the basic first continuous laser 101, first electro-optical modulator 102, first single mode optical fiber 104, first photodetector 108, first electrical amplifier 109, first electrical bandpass filter 110, first optical circulator 103, first optical coupler 107 and frequency divider 111.
The optical carrier wave generated by the first continuous laser 101 enters the first electro-optical modulator 102 to be modulated into an optical dual-tone signal, so as to detect the phase delay change of the long optical fiber, and after passing through the first optical circulator 103 and the first single-mode optical fiber 104, all-optical microwave phase conjugation is performed in the second electro-optical modulator 106. The phase conjugate signal is reversely transmitted to the first optical coupler 107 through the second optical circulator 105, the first single-mode optical fiber 104 and the first optical circulator 103, and is divided into two paths of optical double-tone signals, wherein one path of double-tone signals is subjected to photoelectric conversion into a double-frequency signal through the first photoelectric detector 108, the first electric amplifier 109 and the first electric band-pass filter 110, and the signal is divided into two paths of double-tone signals, and the two paths of double-tone signals return to the radio frequency driving port of the second electro-optic modulator 106 to form a first loop of the photoelectric oscillator; the other path is converted into a fundamental frequency signal through the frequency divider 111 and then returns to the radio frequency port of the first electro-optic modulator 102 to form a second loop of the photoelectric oscillator. After the second optical duplex signal split by the first optical coupler 107 passes through the first optical filter 112, photoelectric conversion is performed in the second photodetector 113 and the second electric band-pass filter 114, so that delay drift caused by the optical fiber can be eliminated. The nonlinear double-ring structure exists in the frequency doubling photoelectric oscillator, so that effective single-mode oscillation output can be realized, in addition, the time delay drift of an optical fiber can be effectively eliminated by the aid of the all-optical microwave phase conjugation part added in the frequency doubling photoelectric oscillator, and the frequency stability of output is improved.
The invention also provides a scheme for realizing single-mode oscillation of the photoelectric oscillator through the nonlinear double-ring structure, which is characterized by comprising the following steps:
two cascaded first electro-optic modulators 102 and second electro-optic modulators 106 are employed to form a nonlinear coupled dual loop, both of which operate at a carrier rejection point. Loop optical signals are generated by a first continuous laser 101, sequentially pass through a first electro-optical modulator 102, a first optical circulator 103, a first single-mode optical fiber 104, a second optical circulator 105, a second electro-optical modulator 106, reversely pass through the second optical circulator 105, the first single-mode optical fiber 104, the first optical circulator 103 and the first optical coupler 107, sequentially pass through a first photoelectric detector 108, a first electric amplifier 109 and a first electric band-pass filter 110, are divided into two paths of electric signals, and one path of electric signals passes through the first frequency divider 111 and is fed into the first electro-optical modulator 102 to form a first loop; the other feed into the second electro-optic modulator 106 forms a second loop. That is, the output of the second loop modulates the signal in the first loop, changing its spectral structure, and the phase shift is eliminated during the reverse transmission in the first single mode fiber 104, resulting in a substantial reduction in the equivalent loop length of the signal in the first loop, and the delay is determined only by the electrical loop, which can be considered as a short loop.
Thus, according to vernier effect, the mode interval of the photoelectric oscillator is determined by a shorter loopWherein τ 2 Is the time delay of the signal through the circuit part constituted by the first photodetector 108, the first electrical amplifier 109, the first electrical bandpass filter 110. On the other hand, the phase noise of the oscillator is determined by a longer loop, resulting in the oscillator having a large mode interval and low phase noise, and effective single-mode oscillation can be achieved after mode selection by the band-pass filter.
According to one aspect of the present invention, an optoelectronic oscillator solution is provided that is capable of outputting low frequency drift electrical signals. The method is characterized by comprising the following steps:
step one, generating an optical duplex signal to detect delay jitter in an optical fiber of the photoelectric oscillator:
when the photoelectric oscillator realizes nonlinear double-ring single-mode oscillation, the single-mode oscillation circle frequency is assumed to be w r The radio frequency signal injected into the first electro-optic modulator 102 may be expressed as:
wherein the method comprises the steps ofIs the phase of the radio frequency signal and t is the time variable. The first continuous laser 101 generates a circle with a frequency w c Is modulated by small-signal carrier suppression in the first electro-optical modulator 102, resulting in a double sideband signal E 1 Can be expressed as:
where i is an imaginary unit. After the signal is transmitted in the first single mode fiber 104 via the first optical circulator 103, a forward transmission signal E is obtained 2 The method comprises the following steps:
wherein the method comprises the steps ofAnd τ 1 Is the phase offset and time jitter introduced by the first single mode fiber 104.
Generating a phase conjugate signal and reversely transmitting the phase conjugate signal in the optical fiber of the photoelectric oscillator:
the injection signal of the second electro-optic modulator 106 is passed through a first frequency divider 111 to obtain a signal V 1 Thus injecting the radio frequency signal V of the second electro-optic modulator 106 2 Can be expressed as:
forward transmission signal E 2 The signal E is obtained by accessing the second optical circulator 105 into the second electro-optic modulator 106 to perform carrier suppression double-sideband modulation 3 The method comprises the following steps:
the phase conjugate signal is reversely transmitted through the first optical circulator 103, the first single-mode fiber 104 and the first optical coupler 107 to eliminate the phase offsetThe resulting backward transmission signal E 4 The method comprises the following steps:
step three, filtering out third-order stray sidebands to obtain low-frequency drifting electric signal output:
two paths of signals are split through the first optical coupler 107, one path of signals is filtered by the first optical filter 112 to remove positive and negative third-order sidebands, then the signals are converted into electric signals by the second photoelectric detector 113 and the spurious signals are filtered by the second electric band-pass filter 114, and the obtained frequency doubling signals are as follows:
it can be seen that V 3 Without phase shift caused by fiber delay jitterNamely, an optoelectronic oscillator capable of outputting a low-frequency drift electrical signal is realized.
The invention has the advantages that:
the invention mainly aims at the problems of drift of output radio frequency along with the change of environmental temperature and spurious side mode suppression in the photoelectric oscillator, introduces an all-optical phase conjugation passive compensation technology into the structural design of the photoelectric oscillator for the first time, adopts an all-optical microwave phase conjugation mode, and avoids the deterioration of frequency stability caused by local oscillation leakage and harmonic spurious on the basis of eliminating the radio frequency phase drift introduced by optical fiber delay jitter; meanwhile, the mode selection mode of the equivalent nonlinear double-ring resonant cavity in the single ring is adopted, so that the amplitude of the radio frequency signal can be stably output while the high-quality single-mode oscillation is ensured. Has important practical significance for miniaturization and integration of photoelectric oscillators in the future.
Drawings
Fig. 1 is a diagram of a low frequency drift low stray light oscillator based on all-optical phase conjugation.
Fig. 2 is a block diagram of one example of the invention.
Fig. 3 (a) is a spectrum diagram before single-mode oscillation of the photoelectric oscillator measured by the example of the present invention.
Fig. 3 (b) is a spectrum diagram after single-mode oscillation of the photoelectric oscillator measured by the example of the present invention.
Fig. 4 is a graph of frequency measurements before and after frequency drift compensation of an optoelectronic oscillator, as measured by an example of the present invention.
Fig. 5 (a) is a graph of phase noise measurements prior to frequency drift compensation of an optoelectronic oscillator as measured by an example of the present invention.
Fig. 5 (b) is a graph of the phase noise measurement after frequency drift compensation of the optoelectronic oscillator measured in accordance with an example of the present invention.
The reference numerals in the figures are illustrated as follows:
a first continuous laser 101, a first electro-optic modulator 102, a first optical circulator 103, a first single-mode optical fiber 104, a second optical circulator 105, a second electro-optic modulator 106, a first optical coupler 107, a first photodetector 108, a first electrical amplifier 109, a first electrical bandpass filter 110, a first frequency divider 111, a first optical filter 112,
a second photodetector 113, a second electrical bandpass filter 114;
a second continuous laser 201, a first polarization controller 202, a third electro-optic modulator 203, a third optical circulator 204, a second single-mode optical fiber 205, a fourth optical circulator 206, an optical amplifier 207, a second polarization controller 208, a fourth electro-optic modulator 209, a second optical coupler 210, a third photodetector 211, a second electrical amplifier 212, a third electrical bandpass filter 213, an electrical coupler 214, a second frequency divider 215, a second optical filter 216, a fourth photodetector 217, a fourth electrical bandpass filter 218, a phase noise analyzer 219, and a frequency counter 220.
Detailed Description
The invention provides a single-mode photoelectric oscillator with low frequency drift and low spurious based on all-optical microwave phase conjugation, which is further described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a circuit principle of a single-mode photoelectric oscillator with low frequency drift and low spurious based on all-optical phase conjugation, which is shown in figure 1, and comprises the following components:
the optical carrier wave generated by the first continuous laser 101 enters the first electro-optical modulator 102 to be modulated into an optical dual-tone signal, so as to detect the phase delay change of the long optical fiber, and after passing through the first optical circulator 103 and the first single-mode optical fiber 104, all-optical microwave phase conjugation is performed in the second electro-optical modulator 106. The phase conjugate signal is reversely transmitted to the first optical coupler 107 through the second optical circulator 105, the first single-mode optical fiber 104 and the first optical circulator 103, and is divided into two paths of optical double-tone signals, wherein one path of double-tone signals is subjected to photoelectric conversion into a double-frequency signal through the first photoelectric detector 108, the first electric amplifier 109 and the first electric band-pass filter 110, and the signal is divided into two paths of double-tone signals, and the two paths of double-tone signals return to the radio frequency driving port of the second electro-optic modulator 106 to form a first loop of the photoelectric oscillator; the other path is converted into a fundamental frequency signal through the frequency divider 111 and then returns to the radio frequency port of the first electro-optic modulator 102 to form a second loop of the photoelectric oscillator. After the second optical duplex signal split by the first optical coupler 107 passes through the first optical filter 112, photoelectric conversion is performed in the second photodetector 113 and the second electric band-pass filter 114, so that delay drift caused by optical fibers can be eliminated. The nonlinear double-ring structure exists in the frequency doubling photoelectric oscillator, so that effective single-mode oscillation output can be realized, in addition, the time delay drift of an optical fiber can be effectively eliminated by the aid of the all-optical microwave phase conjugation part added in the frequency doubling photoelectric oscillator, and the frequency stability of output is improved. The present invention is based on the consideration that: in the frequency multiplication photoelectric oscillator based on long optical fibers, the multimode competition and the main mode drift of the output signals of the photoelectric oscillator are effectively overcome by introducing a passive compensation system based on all-optical phase conjugation and a nonlinear double-loop structure into an optical fiber loop. Low spurious, low frequency drift, low phase noise output of the optoelectronic oscillator is achieved.
Examples:
an exemplary embodiment of the present invention is shown in fig. 2. Specific embodiments of the examples are as follows: the all-optical microwave phase conjugation part is composed of a fourth optical circulator 206, an optical amplifier 207, a second polarization controller 208, a fourth electro-optic modulator 209, a second optical filter 216, a fourth photodetector 217 and a fourth electric band-pass filter 218, and the frequency doubling photoelectric oscillator part comprises a common second continuous laser 201, a first polarization controller 202, a third electro-optic modulator 203, a second single-mode optical fiber 205, a third photodetector 211, a second electric amplifier 212 and a third electric band-pass filter 213, and also comprises a third optical circulator 204, a second optical coupler 210, an electric coupler 214 and a second frequency divider 215. The second single-mode fiber 205 in the frequency doubling photoelectric oscillator is inversely multiplexed under the action of the fourth optical circulator 206, the signal is detected by the third photoelectric detector 211 after being forward and reversely transmitted in the optical fiber loop twice, the obtained frequency doubling electric signal is divided into two paths by the electric coupler 214 after being amplified and filtered, one path is used as the radio frequency electric signal input end of the fourth electro-optical modulator 209, and the other path is used as the radio frequency electric signal input end of the third electro-optical modulator 203 after passing through the second frequency divider 215. The two paths form a nonlinear double-loop structure, so that effective single-mode oscillation output can be realized, and the frequency of the single-mode oscillation signal formula (1) selected according to the third electric band-pass filter 213 is 4.9GHz. In addition, the all-optical microwave phase conjugation part is added into the frequency doubling photoelectric oscillator, so that the time delay drift of the optical fiber can be effectively eliminated, and the frequency stability of output is improved. The third electro-optical modulator 203 of the optoelectronic oscillator works at a carrier suppression point, so that a double-sideband signal formula (2) is obtained, phase jitter information is carried in the third optical circulator 204 and the second single-mode optical fiber 205 to obtain a formula (3), then the double-sideband signal formula (2) sequentially enters the optical amplifier 207 for amplification through the fourth optical circulator 206, the second polarization controller 208 eliminates polarization loss, then the double-sideband signal formula (2) is injected into the fourth electro-optical modulator 209 to be subjected to carrier suppression modulation by the formula (4) with the frequency of 9.8GHz to obtain a phase conjugate signal formula (5), and then the double-sideband signal formula (5) sequentially passes through the fourth optical circulator 206, the second single-mode optical fiber 205, the third optical circulator 204 and the second optical coupler 210 in a reverse transmission mode to obtain a formula (6), finally the third-order sidebands are filtered through the second optical filter 216, and the low-frequency drifting 9.8GHz photoelectric oscillation signal formula (7) is obtained through the fourth photoelectric detector 217 and the fourth band-pass filter 218 for photoelectric conversion and output.
The components used in the invention can be realized by conventional products. The effectiveness of the low-frequency drift low-stray light electric oscillator provided by the invention is verified by the following embodiment, the third electro-optical modulator 203 of the embodiment adopts an intensity modulator with the model of FTM7962, and the fourth electro-optical modulator 209 adopts a double-parallel modulator with the model of FTM7961 EX; a second single mode fiber 205 of length 1km was used as a resonant cavity, and a third photodetector 211 and a fourth photodetector 217 of model number (MPRV 1331A) were used. A second continuous laser 201 is generated using a telexion (PS-TNL) second continuous laser using a second electrical amplifier 212 of the type JiTai (LNA 0015).
In order to measure the frequency-multiplied radio-frequency electric signal output by the electric band-pass filter 218 in this example and observe the difference between the frequency-multiplied radio-frequency electric signal and the output signal of the photoelectric oscillator before single-mode oscillation (i.e. the frequency-multiplied radio-frequency electric signal output by the fourth electric band-pass filter 218 after the connection between the electric coupler 214 and the rf drive of the fourth electric-optic modulator 209 is removed), a conventional phase noise analyzer 219 (including an electric spectrometer) is disposed at the output end of the fourth electric band-pass filter 218 to measure the frequency spectrum, and the measurement results are shown in fig. 3 (a) and 3 (b), so that it can be seen that the example can implement the side mode suppression function of 68 dB.
Next, the frequency-drift-compensated frequency-doubled RF signal V output by this example within 600s is measured by a conventional frequency counter (53230A) 220 3 The frequency measurement comparison result of the frequency-drift-free compensated frequency-multiplied radio frequency electric signal (i.e. one electric signal outputted after the third electric band-pass filter 213) shows that the frequency offset of the frequency-drift-free compensated frequency-multiplied radio frequency electric signal can reach 1.5ppm, and the frequency drift of the frequency-drift-free compensated frequency-multiplied radio frequency electric signal is within 0.04ppm as shown in fig. 4. It can be seen that the photoelectric oscillator of the invention has good frequency stable output performance.
Finally, the frequency-doubled RF electric signal V output by the present example is measured by a conventional phase noise analyzer 219 3 The frequency-doubled radio frequency electric signal V measured by the example is obtained 3 Is compared with the phase noise measurement of the frequency multiplied radio frequency electrical signal without frequency drift compensation (i.e. the one output after the third electrical bandpass filter 213). As can be seen from fig. 5 (a) and 5 (b), the phase at the frequency offset of 10kHzThe noise before and after compensation are-110 dBc/Hz, so that the phase noise performance of the invention is not deteriorated compared with that before frequency drift compensation, i.e. the long-term stability is improved and the short-term stability is not deteriorated.
It will be appreciated 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 adaptations may be made to the embodiments described above without departing from the present invention as defined in the appended claims.
Claims (10)
1. The utility model provides a single mode photoelectric oscillator of low frequency drift based on all-optical microwave phase conjugation which characterized in that: the full-optical microwave phase conjugation part and the frequency doubling photoelectric oscillator part are included; wherein,
the all-optical microwave phase conjugation part consists of a second optical circulator, a second electro-optical modulator, a first optical filter, a second photoelectric detector and a second electric band-pass filter;
the frequency doubling photoelectric oscillator part comprises a first continuous laser, a first electro-optic modulator, a first single-mode optical fiber, a first photoelectric detector, a first electric amplifier, a first electric band-pass filter, a first optical circulator, a first optical coupler and a frequency divider.
2. The single-mode optoelectronic oscillator of claim 1, wherein the low frequency drift is based on all-optical microwave phase conjugation, and wherein: the optical carrier wave generated by the first continuous laser enters the first electro-optical modulator to be modulated into an optical double-tone signal, which is used for detecting the phase delay change of the long optical fiber, and after passing through the first optical circulator and the first single-mode optical fiber, the full-optical microwave phase conjugation is carried out in the second electro-optical modulator.
3. The single-mode optoelectronic oscillator of claim 1, wherein the low frequency drift is based on all-optical microwave phase conjugation, and wherein: the phase conjugate signal is reversely transmitted to the first optical coupler through the second optical circulator, the first single-mode optical fiber and the first optical circulator and is divided into two paths of optical double-tone signals, wherein one path of double-tone signals is subjected to photoelectric conversion into a double-frequency signal through the first photoelectric detector, the first electric amplifier and the first electric band-pass filter, and the signals are divided into two paths of double-tone signals which are returned to the radio frequency driving port of the second photoelectric modulator to form a first loop of the photoelectric oscillator; the other path is converted into a fundamental frequency signal through a frequency divider and then returns to the radio frequency port of the first electro-optic modulator to form a second loop of the photoelectric oscillator.
4. The single-mode optoelectronic oscillator of claim 1, wherein the low frequency drift is based on all-optical microwave phase conjugation, and wherein: after the second path of optical duplex signals split by the first optical coupler pass through the first optical filter, photoelectric conversion is carried out in the second photoelectric detector and the second electric band-pass filter, and delay drift caused by optical fibers is eliminated; the nonlinear double-ring structure exists in the frequency doubling photoelectric oscillator, so that effective single-mode oscillation output is realized.
5. The utility model provides a photoelectric oscillator single mode oscillation based on nonlinear dicyclo structure which characterized in that: a nonlinear coupling double loop is formed by using two cascaded first electro-optical modulators and second electro-optical modulators, and the two first electro-optical modulators and the second electro-optical modulators work at carrier suppression points; loop optical signals are generated by a first continuous laser, sequentially pass through a first electro-optical modulator, a first optical circulator, a first single-mode optical fiber, a second optical circulator and a second electro-optical modulator, reversely transmit the loop optical signals through the second optical circulator, the first single-mode optical fiber and the first optical circulator, sequentially pass through a first photoelectric detector, a first electric amplifier and a first electric band-pass filter, then are divided into two paths of electric signals, and one path of electric signals passes through a first frequency divider and is fed into the first electro-optical modulator to form a first loop; the other path is fed into a second electro-optic modulator to form a second loop; i.e. the output of the second loop modulates the signal in the first loop, changing its spectral structure, the phase shift is eliminated during reverse transmission in the first single mode fiber, resulting in a reduced equivalent loop length of the signal in the first loop, the delay being determined only by the electrical loop, being considered as a short loop.
6. According toThe single-mode oscillation of the optoelectronic oscillator of claim 5, comprising: the mode interval of the photoelectric oscillator is determined by a short loopWherein τ 2 Is the time delay of the signal passing through the circuit part formed by the first photodetector, the first electric amplifier and the first electric band-pass filter.
7. A method for realizing output of low-frequency drift electric signals based on a single-mode photoelectric oscillator; the method is characterized by comprising the following steps: step one, generating an optical duplex signal to detect delay jitter in an optical fiber of the photoelectric oscillator: generating a phase conjugate signal and reversely transmitting the phase conjugate signal in the optical fiber of the photoelectric oscillator: and thirdly, filtering out third-order spurious sidebands to obtain low-frequency drifting electric signal output.
8. The method according to claim 7, wherein: in the first step, after the photoelectric oscillator realizes nonlinear double-loop single-mode oscillation, the single-mode oscillation circle frequency is set as w r The radio frequency signal injected into the first electro-optic modulator is expressed as:
wherein the method comprises the steps ofIs the phase of the radio frequency signal, t is the time variable; the first continuous laser generates a circle with a frequency w c Is modulated by small signal carrier suppression in a first electro-optical modulator to obtain a double sideband signal E 1 Expressed as:
wherein i is an imaginary unit; after the signal is transmitted in the first single-mode fiber through the first optical circulator, the obtained forward transmission signal E 2 The method comprises the following steps:
wherein the method comprises the steps ofAnd τ 1 Is the phase offset and time jitter introduced by the first single mode fiber.
9. The method according to claim 7, wherein: in the second step, the injection signal of the second electro-optic modulator is passed through the first frequency divider to obtain a signal V 1 Thus injecting the radio frequency signal V of the second electro-optic modulator 2 Expressed as:
forward transmission signal E 2 The second optical circulator is connected into a second electro-optical modulator to carry out carrier suppression double-sideband modulation to obtain a signal E 3 The method comprises the following steps:
the phase conjugate signal is reversely transmitted through the first optical circulator, the first single-mode fiber and the first optical coupler to eliminate the phase offsetThe resulting backward transmission signal E 4 The method comprises the following steps:
10. the method according to claim 7, wherein: in the third step, two paths are split through the first optical coupler 107, one path filters out positive and negative third-order sidebands through the first optical filter, then the positive and negative third-order sidebands are converted into electric signals by the second photoelectric detector, and spurious signals are filtered out through the second electric band-pass filter, and the obtained frequency doubling signals are:
V 3 without phase shift caused by fiber delay jitterNamely, an optoelectronic oscillator capable of outputting a low-frequency drift electrical signal is realized.
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