CN107302399B - Optical fiber phase compensator controlled by analog-digital mixing and compensation method - Google Patents
Optical fiber phase compensator controlled by analog-digital mixing and compensation method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
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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
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6163—Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM]
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Abstract
The invention is a fiber phase compensator and compensating method of analog-digital mixing control, the Michelson interferometer of the 3X 3 fiber coupler of this compensator outputs 2 laser signals with phase difference of 2 pi/3, connect to the first, two photodetectors, the output signal connects to the microprocessor; the other path of analog electric signal of the first photoelectric detector is added with the control signal of the microprocessor to the A modulator to jointly control the A modulator. The microprocessor output signal controls the B modulator. According to the compensation method, the analog signal of the first photoelectric detector directly carries out phase compensation on the A modulator; the microprocessor obtains the phase change direction and change value of the coherent signal according to the output of the two photoelectric detectors, the drift amount exceeds pi/2, and the microprocessor digitally controls the A modulator to compensate within + -pi/2. When the A modulator is near full range, the microprocessor adjusts the B modulator to restore the A to 50% range. The invention combines analog and digital signals to meet the requirements of wide range and high-precision phase compensation.
Description
Technical Field
The invention relates to an optical fiber stable phase transmission device for transmitting radio frequency phase-related signals or frequency-stabilized signals by using optical fibers, in particular to an optical fiber phase compensator for analog-digital hybrid control and a compensation method thereof, which are used for accurately compensating phase jitter of optical fiber delay by mixing analog signals and digital signals.
Background
The optical fiber phase compensator is an optical fiber phase stabilizing transmission device applied to optical fiber transmission of radio frequency coherent signals or frequency stabilizing signals, and comprises a single longitudinal mode laser, an optical fiber interferometer, a photoelectric detector, a microprocessor, a digital-analog and analog-digital conversion circuit, a wavelength division multiplexer and an optical fiber phase modulator based on emission type piezoelectric ceramics, wherein a wave division splitting optical fiber box formed by the wave division multiplexer and an optical fiber reflector is arranged at a receiving end, and the optical fiber phase modulator and the wave division optical fiber box are respectively connected to two ends of a transmission optical fiber to jointly complete optical fiber phase jitter compensation of the transmission optical fiber and transparent transmission of service signals on the transmission optical fiber.
The existing optical fiber phase compensator adopts an analog control method, and judges the phase compensation direction by detecting the change of the output light power of an optical fiber interferometer. The method requires that the optical fiber phase drift compensation accuracy is controlled within + -pi/2, namely, the optical fiber phase drift compensation accuracy is controlled in a rising edge part or a falling edge part of one optical wave signal period; since the feedback control reference point is only one power reference point, when the phase shift amount exceeds the above range, the feedback control reference point uses the middle point of another light wave period as the reference point, and thus when the phase shift exceeds one or n light wave periods, the phase shift of 2npi cannot be found and compensated, and the feedback control is disabled. Meanwhile, as the optical fiber phase compensator uses a continuous laser as a detection signal, the laser wavelength is only 1.55 mu m, and for an optical fiber phase modulator based on a single PZT, the dynamic range of effective adjustment is generally not more than 12 bits, so that the compensation range of the existing optical fiber phase compensator is limited to be within 10.6ps, the effective compensation optical fiber distance is only hundreds of meters, and the stable phase transmission requirement of an optical fiber with a longer distance cannot be met. Therefore, for the use environment with severe vibration and large temperature change, feedback control failure caused by power reference point tracking failure and frequent resetting of the optical fiber phase compensator caused by limited compensation range can be generated, and the use is seriously influenced.
To avoid feedback control failure and increase the effective compensation range of the fiber phase compensator, some schemes use fringe counting to relax the accuracy of phase drift detection and compensation, use two or more fiber phase modulators formed by winding PZT fibers to perform phase compensation, or use adjustable fiber delay lines (VOD) to perform phase compensation at the same time, but it is difficult to simultaneously compromise the high accuracy characteristics of the analog control method.
Disclosure of Invention
The invention aims to overcome the defects of small phase compensation range and high requirement on working environment of an optical fiber phase compensator, and provides an optical fiber phase compensator controlled by analog-digital mixing. The digital signal and the analog signal are mixed to carry out compensation control on the phase drift.
The invention further aims to provide a compensation method of the optical fiber phase compensator for analog-digital hybrid control, wherein the Michelson interferometer based on the 3×3 optical fiber coupler outputs two paths of laser signals with the phase difference of 2 pi/3 to the first photoelectric detector and the second photoelectric detector, and one path of analog electric signal output by the first photoelectric detector is directly connected to an adder connected with the A modulator for feedback control phase compensation; the other path of analog electric signals output by the first photoelectric detector and the analog electric signals output by the second photoelectric detector are respectively sent to a microprocessor through analog-to-digital conversion, the microprocessor obtains the change direction of the coherent signals by a double-light path direction judging method, the phase change value of the coherent signals, namely the phase drift amount exceeds pi/2 value, is detected by a fringe counting method, a digital control signal of phase compensation is obtained, and the digital control signal is sent to an adder through digital-to-analog conversion and added with the analog electric signals of the first photoelectric detector, so that the phase drift amount of the A modulator is controlled to be compensated to be within +/-pi/2; when the regulating quantity of the A modulator is close to the full range, in order to prevent the A modulator from exceeding the regulating range, the microprocessor sends out a digital control signal to regulate the B modulator in the same direction through digital-to-analog conversion until the phase regulating value of the A modulator is recovered to be close to 50% of the range. The combination of analog signals and digital signals gives attention to the requirements of wide range and high-precision phase compensation.
The invention relates to an optical fiber phase compensator for analog-digital hybrid control, which comprises a single longitudinal mode laser, an optical fiber interferometer, a microprocessor, a photoelectric detector, a digital-analog conversion circuit, an analog-digital conversion circuit, a wavelength division multiplexer and an optical fiber phase modulator based on emission type piezoelectric ceramics, wherein the optical fiber interferometer is a Michelson interferometer based on a 3X 3 optical fiber coupler, the single longitudinal mode laser is connected to a 2 nd port of the 3X 3 optical fiber coupler of the Michelson interferometer, a 4 th port of the single longitudinal mode laser is used as a measuring arm of the Michelson interferometer, and is connected with the wavelength division multiplexer to be combined with a service optical signal input into the wavelength division multiplexer at the same time, and a common end of the wavelength division multiplexer is connected with a transmission optical fiber through an A modulator and a B modulator; the outputs of the A modulator and the B modulator which are connected in series through the optical fibers are the output end of the optical fiber phase compensator. The 6 th port of the 3X 3 optical fiber coupler is used as a reference arm to be connected with an optical fiber reflector of the Michelson interferometer, two paths of optical signals reflected by the optical fiber reflector of the transmission optical fiber and the optical fiber reflector of the 6 th port return to the 3X 3 optical fiber coupler through the 4 th port and the 6 th port respectively, the optical signals are respectively connected into the first photoelectric detector and the second photoelectric detector through the 1 st port and the 3 rd port, and the phase difference of the optical signals output by the 1 st port and the 3 rd port is 2 pi/3. The 5 th port of the 3 x 3 fiber coupler of the present invention is empty.
One path of analog electric signal output after photoelectric conversion of the first photoelectric detector is directly connected to an adder for feedback control phase compensation; the other path of analog electric signals output by the first photoelectric detector and the electric signals obtained by photoelectric conversion of the second photoelectric detector are connected to the microprocessor after passing through the analog-to-digital conversion module, the first path of control signals output by the microprocessor are connected to the adder after passing through the digital-to-analog conversion module, the adder is connected with the A modulator, and the digital control signals of the microprocessor are added with the analog electric signals output by the first photoelectric detector to jointly control the A modulator after being converted. And a second path of control signal output by the microprocessor is connected into the B modulator after passing through the digital-to-analog conversion module.
The A modulator is a small-range optical fiber phase modulator, and the B modulator is a large-range optical fiber phase modulator. The A modulator is an optical fiber phase modulator in which optical fibers are wound on tubular emission type piezoelectric ceramics, and the piezoelectric ceramics electrostricts to realize optical fiber phase adjustment. The B modulator is an optical fiber phase modulator with optical fibers wound on tubular emission type piezoelectric ceramics or a continuously adjustable optical fiber delay line. The maximum adjusting range of the modulator B is 10-100 times of the maximum adjusting range of the modulator A.
The A modulator is a stepless regulation, namely a continuously regulated modulator, the regulating step length of the B modulator is 10-100 lambda, and lambda is the wavelength of a laser signal output by a single longitudinal mode laser. Recommended as 10λ.
The 3×3 fiber coupler has a splitting ratio of 1:1:1, i.e. the optical signals output from the ports 4, 5 and 6 have equal power.
After the analog electric signal obtained by photoelectric conversion of the first photoelectric detector passes through a signal amplifying circuit, one path of the analog electric signal is connected with an adder, and the other path of the analog electric signal is connected with a microprocessor through an analog-to-digital conversion module; the analog electric signal obtained by photoelectric conversion of the second photoelectric detector is connected to the microprocessor through the analog-to-digital conversion module after passing through the signal amplifying circuit. The two signal amplifying circuits are identical.
The adder is connected to the A modulator through a high-voltage amplifying circuit, and the second path of control signal output by the microprocessor is connected to the B modulator through the high-voltage amplifying circuit after passing through the digital-to-analog conversion module. The two high voltage amplifying circuits are identical.
A compensation method of an optical fiber phase compensator for analog-digital hybrid control mainly comprises the following steps:
i, the phase adjustment range is at 50% range
After the A modulator and the B modulator are powered on, the default phase adjustment range is at 50%;
II, the phase drift of the optical fiber is within + -pi/2, and the analog signal directly controls the A modulator
When the phase drift amount of the optical fiber is within a range of +/-pi/2, a detection power value of a characteristic phase point is selected as an analog feedback control reference point, positive feedback or negative feedback is determined to be adopted according to one of rising edges or falling edges of a sinusoidal phase change curve, and analog feedback control phase compensation within +/-pi/2 is carried out in a feedback compensation direction by taking the analog feedback control reference point as a base point. The analog feedback signal does not need to be interfered by a microprocessor, and the feedback control is automatically performed. Under the initial condition, an analog signal fed back by the first photoelectric detector and a zero voltage control signal output by the microprocessor enter an adder to control the A modulator.
The analog feedback control reference point selects an average value of a maximum value and a minimum value of the recommended first photoelectric detector detection power.
III, the phase drift of the optical fiber exceeds the range of + -pi/2, and the digital signal participates in controlling the A modulator
When the optical fiber phase drift exceeds the + -pi/2 range, the analog feedback signal of the first photodetector will be at 2npi, and the A modulator loses the feedback control reference point. n is an integer not equal to zero, positive or negative. The microprocessor adopts a double-light path direction judging method to identify the phase drift direction according to the signals of the two photoelectric detectors, adopts a fringe counting method to detect the magnitude of the phase drift amount, obtains a digital control signal of the A modulator, and adds the digital control signal with an analog electric signal output by the first photoelectric detector in an adder after digital-analog conversion, and then the digital control signal is connected to the A modulator. The A modulator not only works in an analog feedback control state, but also receives the intervention of a digital control signal of the microprocessor.
The digital control signal intervenes the A modulator to compensate the phase shift of 2n pi, so that the phase shift quantity is recovered to the original feedback control range, namely within the range of + -pi/2; the signals of the two photodetectors make the voltage signal of the digital control signal of the A modulator output by the microprocessor stable at the current voltage until the next occurrence of the optical fiber phase drift exceeding the range of + -pi/2, and the microprocessor will interfere with the phase compensation of the A modulator again by the digital control signal.
Range adjustment for IV, A modulator
When the A modulator reaches 5% or 95% of the adjusting range, namely approaches 0% or 100%, in order to prevent the A modulator from exceeding the adjusting range, the digital control signal sent by the microprocessor slowly adjusts the B modulator in the same direction through digital-to-analog conversion until the phase adjusting value of the A modulator is restored to 45% to 55% of the range.
Compared with the prior art, the optical fiber phase compensator and the compensating method for analog-digital hybrid control have the beneficial effects that: 1. the problem of high-precision analog feedback control feedback reference point drift of the optical fiber phase compensator when the phase drift amount exceeds the range of +/-pi/2 is solved, a microprocessor is adopted to output a digital control signal which can compensate the phase drift of the feedback reference point to act on the optical fiber phase modulator with a small range, so that the phase drift amount required to be regulated of the optical fiber phase modulator with the small range is recovered to be within the range of +/-pi/2; 2. the analog control and the digital control are combined to meet the requirements of large-range and high-precision phase compensation, the phase compensation precision reaches 0.39 fs-3.9 fs, even higher precision is achieved, the effective compensation optical fiber distance reaches 10km, and the ultra-high precision stable phase transmission of long-distance optical fibers is realized.
Drawings
Fig. 1 is a schematic diagram of an embodiment of an optical fiber phase compensator for analog-digital hybrid control.
Fig. 2 is a control flow chart of an embodiment of a compensation method of the optical fiber phase compensator for analog-digital hybrid control.
Detailed Description
Analog-to-digital hybrid controlled fiber phase compensator embodiment
The embodiment of the optical fiber phase compensator controlled by the analog-digital hybrid is shown in fig. 1, and comprises a single longitudinal mode laser, an optical fiber interferometer, a microprocessor, a photoelectric detector, a digital-analog conversion circuit, an analog-digital conversion circuit, a signal amplifying circuit, a high-voltage amplifying circuit, a wavelength division multiplexer and two optical fiber phase modulators based on emission type piezoelectric ceramics, wherein the optical fiber interferometer in the embodiment is a Michelson interferometer based on a 3×3 optical fiber coupler, the single longitudinal mode laser is connected to the 2 nd port of the 3×3 optical fiber coupler of the Michelson interferometer, the 4 th port is used as a measuring arm of the Michelson interferometer, the 4 th port is connected with the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected with a transmission optical fiber through an A modulator and a B modulator, and the output ends of the A modulator and the B modulator connected in series with the optical fiber are the output ends of the optical fiber phase compensator. The 6 th port of the 3X 3 optical fiber coupler is used as a reference arm to be connected with an optical fiber reflector of the Michelson interferometer, two paths of optical signals reflected by the optical fiber reflector of the transmission optical fiber and the optical fiber reflector of the 6 th port return to the 3X 3 optical fiber coupler through the 4 th port and the 6 th port respectively, the optical signals are respectively connected into the first photoelectric detector and the second photoelectric detector through the 1 st port and the 3 rd port, and the phase difference of the optical signals output by the 1 st port and the 3 rd port is 2 pi/3. The 5 th port is empty.
In the embodiment, after photoelectric conversion, an analog electric signal output by the first photoelectric detector is amplified by a signal amplifying circuit, one path of the analog electric signal is directly connected to an adder, and the other path of the analog electric signal is connected to a microprocessor after passing through an analog-digital conversion module; the electric signal obtained by photoelectric conversion of the second photoelectric detector is connected to the microprocessor through the analog-digital conversion module after passing through another same signal amplifying circuit.
The first path of control signal output by the microprocessor is connected to the adder after digital-to-analog conversion, the adder is connected with the A modulator through a high-voltage amplifying circuit, and the digital control signal of the microprocessor is converted and added with the analog electric signal output by the first photoelectric detector to jointly control the A modulator. The second path of control signal output by the microprocessor is connected to the B modulator through another same high-voltage amplifying circuit after passing through the digital-to-analog conversion module.
The A modulator of this example is a small-range fiber phase modulator, and the B modulator is a large-range fiber phase modulator. The A, B modulators of this example are all fiber phase modulators with optical fibers wrapped around a tubular emissive piezoelectric ceramic. The maximum adjustment range of the modulator B in this example is 100 times the maximum adjustment range of the modulator A.
The A modulator is a continuously-regulated modulator, and the regulating step length of the B modulator is 10λ.
The splitting ratio of the 3×3 fiber coupler of this example is 1:1:1, i.e. the optical signals output to the 4, 5, and 6 ports have equal power.
Compensation method embodiment of analog-digital hybrid control optical fiber phase compensator
The flow chart of the embodiment of the compensation method of the optical fiber phase compensator controlled by the analog-digital mixing is shown in fig. 2, and the main steps are as follows:
i, the phase adjustment range is at 50% range
After the A modulator and the B modulator are powered on, the default phase adjustment range is at 50%;
II, the phase drift of the optical fiber is within + -pi/2, and the analog signal directly controls the A modulator
When the phase drift amount of the optical fiber is within a range of +/-pi/2, an average value of a maximum value and a minimum value of the detection power of the first photoelectric detector is selected as an analog feedback control reference point, positive feedback or negative feedback is determined to be adopted according to one of rising edges or falling edges of a phase change sinusoidal curve, and analog feedback control phase compensation within +/-pi/2 is carried out in a feedback compensation direction by taking the analog feedback control reference point as a base point. Under the initial condition, an analog signal fed back by the first photoelectric detector and a zero voltage control signal output by the microprocessor enter an adder to control the A modulator.
III, the phase drift of the optical fiber exceeds the range of + -pi/2, and the digital signal participates in controlling the A modulator
When the optical fiber phase drift exceeds the + -pi/2 range, the analog feedback signal of the first photodetector will be at 2npi, n being an integer not equal to zero. The microprocessor adopts a double-light path direction judging method to identify the phase drift direction according to the signals of the two photoelectric detectors, adopts a fringe counting method to detect the magnitude of the phase drift amount, obtains a digital control signal of the A modulator, and adds the digital control signal with an analog electric signal output by the first photoelectric detector in an adder after digital-analog conversion, and then the digital control signal is connected to the A modulator. The A modulator not only works in an analog feedback control state, but also receives the intervention of a digital control signal of the microprocessor.
The digital control signal intervenes the A modulator to compensate the phase shift of 2n pi, so that the phase shift quantity is recovered to the original feedback control range, namely within the range of + -pi/2; the signals of the two photodetectors make the voltage signal of the digital control signal of the A modulator output by the microprocessor stable at the current voltage until the next occurrence of the optical fiber phase drift exceeding the range of + -pi/2, and the microprocessor will interfere with the phase compensation of the A modulator again by the digital control signal.
Range adjustment for IV, A modulator
When the A modulator reaches 5% or 95% of the adjusting range, namely approaches 0% or 100%, in order to prevent the A modulator from exceeding the adjusting range, the digital control signal sent by the microprocessor slowly adjusts the B modulator in the same direction through digital-to-analog conversion until the phase adjusting value of the A modulator is restored to 45% to 55% of the range.
The above embodiments are merely specific examples for further detailed description of the object, technical solution and advantageous effects of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope of the present disclosure are included in the scope of the present invention.
Claims (7)
1. The utility model provides an optical fiber phase compensator of analog-digital hybrid control, includes single longitudinal mode laser instrument, optical fiber interferometer, microprocessor, photoelectric detector, digital analog conversion circuit, analog digital conversion circuit, wavelength division multiplexer and based on emitting type piezoceramics's optical fiber phase modulator, its characterized in that:
the optical fiber interferometer is a Michelson interferometer based on a 3X 3 optical fiber coupler, a single longitudinal mode laser is connected to a 2 nd port of the 3X 3 optical fiber coupler of the Michelson interferometer, a 4 th port of the single longitudinal mode laser is used as a measuring arm of the Michelson interferometer, the single longitudinal mode laser is connected with a wavelength division multiplexer and is used for combining with a service optical signal input into the wavelength division multiplexer at the same time, a public end of the wavelength division multiplexer is connected with a transmission optical fiber through an A modulator and a B modulator, and the output ends of the A modulator and the B modulator which are connected in series by the optical fiber are output ends of the optical fiber phase compensator; the 6 th port of the 3X 3 optical fiber coupler is used as a reference arm to be connected with an optical fiber reflector of a Michelson interferometer, two paths of optical signals reflected by the optical fiber reflector of the transmission optical fiber and the optical fiber reflector of the 6 th port return to the 3X 3 optical fiber coupler through the 4 th port and the 6 th port respectively, and are respectively connected into the first photoelectric detector and the second photoelectric detector through the 1 st port and the 3 rd port, the phase difference of the optical signals output by the 1 st port and the 3 rd port is 2 pi/3, and the 5 th port of the 3X 3 optical fiber coupler is empty;
one path of analog electric signal output by the first photoelectric detector is directly connected to the adder; the other path of analog electric signals output by the first photoelectric detector and the electric signals obtained by photoelectric conversion of the second photoelectric detector are connected to a microprocessor after passing through an analog-to-digital conversion module, the first path of control signals output by the microprocessor are connected to the adder after passing through digital-to-analog conversion, the adder is connected with an A modulator, and the digital control signals of the microprocessor are added with the analog electric signals output by the first photoelectric detector to jointly control the A modulator after being converted; the second path of control signal output by the microprocessor is connected to the B modulator after passing through the digital-to-analog conversion module;
the B modulator is a wide-range optical fiber phase modulator, and the A modulator is a small-range optical fiber phase modulator;
the split ratio of the 3×3 fiber coupler is 1:1:1, i.e. the optical signals output by the ports 4, 5 and 6 are equal in power;
the compensation method of the optical fiber phase compensator for analog-digital hybrid control mainly comprises the following steps:
i, the phase adjustment range is at 50% range
After the A modulator and the B modulator are powered on, the default phase adjustment range is at 50%;
II, the phase drift of the optical fiber is within + -pi/2, and the analog signal directly controls the A modulator
The first photoelectric detector detects the power variation amplitude of an output signal of the optical fiber interferometer caused by the phase jitter of the transmission optical fiber, when the phase drift amount of the optical fiber is within a range of +/-pi/2, a detection power value of a characteristic phase point is selected as an analog feedback control reference point, one of the rising edge and the falling edge of a sinusoidal curve of the phase variation is selected according to the rising edge or the falling edge, positive feedback or negative feedback is determined to be adopted, and analog feedback control phase compensation within +/-pi/2 is carried out in a feedback compensation direction by taking the analog feedback control reference point as a base point; under the initial condition, an analog signal fed back by the first photoelectric detector and a zero voltage control signal output by the microprocessor enter an adder to control the A modulator;
III, the phase drift of the optical fiber exceeds the range of + -pi/2, and the digital signal participates in controlling the A modulator
When the optical fiber phase drift exceeds the range of + -pi/2, the analog feedback signal of the first photoelectric detector is positioned at 2n pi, and n is an integer which is not equal to zero; the microprocessor adopts a double-light path direction judging method to identify the phase drift direction according to the signals of the two photoelectric detectors, adopts a fringe counting method to detect the magnitude of the phase drift amount, obtains a digital control signal of the A modulator, and adds the digital control signal with an analog electric signal output by the first photoelectric detector in an adder to access the A modulator after digital-analog conversion; the A modulator not only works in an analog feedback control state, but also receives the intervention of a digital control signal of the microprocessor;
the digital control signal intervenes the A modulator to compensate the phase shift of 2n pi, so that the phase shift quantity is recovered to the original feedback control range, namely within the range of + -pi/2; the signals of the two photoelectric detectors enable the voltage signal of the digital control signal of the A modulator output by the microprocessor to be stable at the current voltage until the next occurrence that the optical fiber phase drift amount exceeds the range of +/-pi/2, and the microprocessor intervenes the phase compensation of the A modulator again by the digital control signal;
range adjustment for IV, A modulator
When the A modulator reaches 5% or 95% of the adjusting range, the digital control signal sent by the microprocessor is converted into digital analog to adjust the B modulator in the same direction until the phase adjusting value of the A modulator is recovered to 45% to 55% range.
2. The analog-to-digital hybrid controlled fiber phase compensator of claim 1, wherein:
the A modulator is an optical fiber phase modulator of tubular emission type piezoelectric ceramics with optical fibers wound around the optical fibers; the B modulator is an optical fiber phase modulator with optical fibers wound on tubular emission type piezoelectric ceramics or a continuously adjustable optical fiber delay line.
3. The analog-to-digital hybrid controlled fiber phase compensator of claim 1, wherein:
the modulator A is a continuously-regulated modulator; the regulating step length of the B modulator is 10-100 lambda, and lambda is the wavelength of a laser signal output by the single longitudinal mode laser.
4. The analog-to-digital hybrid controlled fiber phase compensator of claim 1, wherein:
the modulator A is a continuously-regulated modulator; the adjusting step length of the B modulator is 10λ, and λ is the wavelength of the laser signal output by the single longitudinal mode laser.
5. The analog-to-digital hybrid controlled fiber phase compensator of claim 1, wherein:
the maximum adjusting range of the B modulator is 10-100 times of the maximum adjusting range of the A modulator.
6. The analog-to-digital hybrid controlled fiber phase compensator of claim 1, wherein:
analog signals output by the two photoelectric detectors pass through the same signal amplifying circuit and then are connected into the analog-to-digital conversion module; and/or the adder is connected to the A modulator through a high-voltage amplifying circuit, a second path of control signal output by the microprocessor is connected to the B modulator through a high-voltage amplifying circuit after passing through the digital-to-analog conversion module, and the two high-voltage amplifying circuits are identical.
7. The compensation method of an analog-to-digital hybrid controlled fiber phase compensator according to any one of claims 1-6 wherein:
and (3) selecting an average value of the maximum value and the minimum value of the detection power of the first photoelectric detector by the analog feedback control reference point in the step (II).
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