CN107994950A - A kind of M-Z modulators quadrature bias point control device and its control method - Google Patents
A kind of M-Z modulators quadrature bias point control device and its control 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
Abstract
The present invention provides a kind of M Z modulators quadrature bias point control device, it is characterised in that：The quadrature bias point control device includes optical detection amplifier, A/D converter, microcontroller, D/A converter, low-pass filter I, full-wave rectifier I, low-pass filter II, bandpass filter, full-wave rectifier II, low-pass filter III, multiplier, 1KHz sinusoidal signal generators, adder；Based on foregoing quadrature bias point control device, present invention also offers a kind of control method of M Z modulators quadrature bias point.The beneficial effects of the invention are as follows：It is big to the control applicable working temperature scopes of M Z modulator quadrature bias point drifts, control accuracy is high.
Description
Technical field
The present invention relates to modulator control technical field, particularly a kind of M-Z modulators quadrature bias point control device
And its control method.
Background technology
At present, the direction of optical fiber telecommunications system towards high speed, long range, large capacity is developed, due to using lithium niobate base bottom
M-Z modulators (MZ Mach-Zehnder) have modulation rate height, stable work in work, the frequency chirp of modulated signal it is small,
Light loss is relatively low, suitable for advantages such as a variety of patterns, is widely used in the phases such as high speed optical communication system, Microwave photonics link
Close in optical transport processing system.Since the transfer function of M-Z modulators is non-thread shape function, so when using M-Z modulators
Its transfer function can be operated in when loading a DC offset voltage to it to ensure its signal modulation by, which needing, suitably works
Point on.But since the change of the factors such as time, environment temperature, external electric field, stress all can be to the stabilization of M-Z modulators in working
Property have an impact, M-Z modulator bias points drift about, cause modulated signal degradation, the Transmission system bit error rate rise.For
Guarantee M-Z modulators can with steady operation on the suitable operating point of its transfer function, it is necessary to according to outputting and inputting light letter
Number situation, is in time modified caused M-Z modulators operating point drift due to various reasons.
Optical communication system performance is influenced in order to reduce M-Z modulators biasing point drift, scientific research technical staff has done largely
Research work, propose various M-Z modulators Bias point control methods, be mainly summarized as two kinds：One kind is power method, Yi Zhongshi
Scrambling method；The former carries out feedback control compensation based on the optical power ratio that modulator is output and input to its operating point drift, but
Modulator output light signal fed back can be fluctuated with input optical power to be changed and changes with optical path loss, causes Bias point control precision
Difference；Later approach is mostly used in engineering at present, i.e., is adjusted using the feedback of a low frequency dither to realize
The locking of device bias point processed, however, due to theory analysis not comprehensively, the influence of the factor such as circuit design is unreasonable, the prior art
The method of middle suppression M-Z modulator quadrature bias point drifts existing defects, such as operating temperature range is small, control in practical applications
Precision processed is low etc..
The content of the invention
The problem of for background technology, the present invention provide a kind of M-Z modulators quadrature bias point control device and its control
Method processed, to solve in the prior art, the operating temperature range that is applicable in the control method of modulator quadrature bias point drift is small,
The problem of control accuracy is low.
To achieve the object of the present invention, the present invention provides a kind of M-Z modulators quadrature bias point control device, it is created
New point is：The quadrature bias point control device include optical detection amplifier, A/D converter, microcontroller, D/A converter,
Low-pass filter I, full-wave rectifier I, low-pass filter II, bandpass filter, full-wave rectifier II, low-pass filter III, multiply
Musical instruments used in a Buddhist or Taoist mass, 1KHz sinusoidal signal generators and adder；
The input with A/D converter, low-pass filter I and bandpass filter respectively of the output terminal of the optical detection amplifier
End connection；The A/D converter is connected with microcontroller, and the microcontroller is sent out with D/A converter, 1KHz sinusoidal signals respectively
Raw device and multiplier (11) connection；The output terminal of the low-pass filter I is connected with the input terminal of full-wave rectifier I, described complete
The output terminal of ripple rectifier I is connected with the input terminal of low-pass filter II；The output terminal of the bandpass filter and full-wave rectification
The input terminal connection of device II, the output terminal of the full-wave rectifier II are connected with the input terminal of low-pass filter III；The low pass
The output terminal of wave filter II and low-pass filter III are connected with two input terminals of multiplier respectively；The D/A converter,
The output terminal of 1KHz sinusoidal signal generators and multiplier is connected with three input terminals of adder respectively；
Output terminal of the output terminal of the adder as quadrature bias point control device；
The multiplier can do division arithmetic to two-way input signal；
The tri- road input voltage signals of adder Neng Dui carry out summation operation.
Present invention also offers a kind of control method of M-Z modulators quadrature bias point, involved hardware includes laser
Device, M-Z modulators, photo-coupler and quadrature bias point control device, the quadrature bias point control device is as previously described；
The light carrier input terminal of M-Z modulators is connected with a laser, and the output terminal of M-Z modulators and a photo-coupler connect
Connect, photo-coupler is single-input double-output, and the first output terminal of the photo-coupler and the second output terminal splitting ratio are 99:1, it is described
Second output terminal is connected with the input terminal of optical detection amplifier, the output terminal of the adder and the bias voltage of M-Z modulators
Input terminal connects；
Its innovative point is：In quadrature bias point control device operational process：The optical detection amplifier can be by described
Output optical signal of second output terminal to M-Z modulators carries out continuous sampling, and obtained sampled signal is transferred to A/D respectively
Converter, low-pass filter I and bandpass filter；The A/D converter can be AD converted sampled signal in real time processing, and
By obtained digital data transmission to microcontroller；The D/A converter can be to microcontroller output signal carry out DA in real time
Conversion process, and by obtained signal transmission to adder；The bandpass filter, full-wave rectifier II and low-pass filter
III is denoted as the first filter module, and the low-pass filter I, full-wave rectifier I and low-pass filter II are denoted as the second filtering mould
Block；First filter module can be filtered sampled signal in real time processing, and obtained filtering signal 1 is transmitted to multiplication
Device；Second filter module can be filtered sampled signal in real time processing, and obtained filtering signal 2 is transmitted to multiplication
Device；The multiplier can carry out filtering signal 1 and filtering signal 2 in real time division arithmetic and handle to obtain processing signal 1；It is described to add
Musical instruments used in a Buddhist or Taoist mass can be to multiplier, 1KHz sinusoidal signal generators and D/A converter three output signal carry out addition process simultaneously in real time
Obtained processing signal 2 is loaded into the bias voltage input of M-Z modulators；
When quadrature bias point control device is just started to work, the output of multiplier is first in off state, microcontroller
Scanning voltage is exported to adder by D/A converter, meanwhile, microcontroller is biased point search according to the digital signal
Operation, after searching the current quadrature bias point of M-Z modulators, microcontroller is persistently exported by D/A converter to adder
The bias voltage to match with the quadrature bias point of M-Z modulators, while exporting bias voltage, microprocessor control 1KHz is just
String signal generator persistently exports the sinusoidal jitter signal of 1kHz to adder, while exporting bias voltage, microcontroller control
The output terminal gating of multiplier processed；
First filter module is as follows filtered sampled signal processing：
The bandpass filter extracts the 2kHz sinusoidal signal components in sampled signal, and obtained signal is defeated
Go out to full-wave rectifier II；Output signals of the full-wave rectifier II to bandpass filter carries out full-wave rectification processing, and will obtain
Signal output to low-pass filter III；Low-frequency d point in output signals of the low-pass filter III to full-wave rectifier II
Amount is extracted, you can obtains corresponding filtering signal 1；
Second filter module is as follows filtered sampled signal processing：
The low-pass filter I extracts the 1kHz first harmonic components in sampled signal, and the signal that will be obtained
Export to full-wave rectifier I；Output signals of the full-wave rectifier I to low-pass filter I carries out full-wave rectification processing, and will obtain
Signal output to low-pass filter II；Low-frequency d component in output signals of the low-pass filter II to full-wave rectifier I
Extracted, you can obtain corresponding filtering signal 2.
By adopting the above-described technical solution, the present invention has the advantages that：Obtained using analog circuitry processes means
Obtain a bias point and correct Voltage Feedback to the direct current biasing end of M-Z modulators, realize to the quadrature bias point of M-Z modulators
Locking control, wide temperature range that the modulator and control method are applicable in, control accuracy are high.
Brief description of the drawings
The brief description of the drawings of the present invention is as follows.
Fig. 1 is M-Z modulators quadrature bias point control device provided by the invention and its application system schematic diagram.
In figure：1st, optical detection amplifier；2nd, A/D converter；3rd, microcontroller；4th, D/A converter；5th, low-pass filter I；
6th, full-wave rectifier I；7th, low-pass filter II；8th, bandpass filter；9th, full-wave rectifier II；10th, low-pass filter III；11、
Multiplier；12nd, 1KHz sinusoidal signal generators；13rd, adder 14, laser；15th, M-Z modulators；16th, photo-coupler.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
The application system of the quadrature bias point control device of M-Z modulators as shown in Figure 1, including laser 14, M-Z
Modulator 15, photo-coupler 16 and M-Z modulators of the present invention quadrature bias point control device.
In the present embodiment, laser 14 is using the Distributed Feedback Laser MODEL 1782 of emcore companies production, operation wavelength
For 1550nm, output power light 50mW；M-Z modulators 15 are using the AM20 intensity modulators of oclaro companies production, operating wave
A length of 1550nm, modulation bandwidth 20GHz, half-wave voltage 5V, bias voltage input adjustable range is ± 20V；Photo-coupler
16 be single-input double-output, and the first output terminal of the photo-coupler 16 and the splitting ratio of the second output terminal are 99:1, input and output
Optical fiber is polarization maintaining optical fibre；
The light carrier input terminal of M-Z modulators 15 is connected with laser 14, the output terminal and photo-coupler of M-Z modulators 15
16 connections, photo-coupler 16 is single-input double-output, and the first output terminal of the photo-coupler 16 is with the second output terminal splitting ratio
99:1, the light wave components of the first output terminal output 99% of coupler 16 are used for downstream component, the second output of coupler 16
End is connected with the input terminal of quadrature bias point control device, and the output terminal and M-Z modulators 15 of quadrature bias point control device are inclined
Put voltage input end connection；
Quadrature bias point control device include optical detection amplifier 1, A/D converter 2, microcontroller 3, D/A converter 4,
Low-pass filter I5, full-wave rectifier I6, low-pass filter II7, bandpass filter 8, full-wave rectifier II9, low-pass filter
III10, multiplier 11,1KHz sinusoidal signal generators 12, adder 13；
Optical detection amplifier 1 includes photodetection and Current Voltage converter amplifier circuit, can turn the optical signal received
Turn to electric signal and be amplified to certain numerical value；
A/D converter 2 is used to analog voltage signal being converted to digital signal；
Microcontroller 3 is used as central processing unit, and output signal that can be to A/D converter 2 is handled to obtain direct current inclined
Voltage signal is put, and by DC offset voltage signal output to D/A converter 7, in addition, microcontroller 3 sinusoidal to 1KHz can be believed
The action of number generator 12 is controlled, and exports sinusoidal scrambling signal, and microcontroller 3 can also control the choosing of 11 output terminal of multiplier
It is logical；
D/A converter 4 is used to convert digital signals into analog signal；
1KHz sinusoidal signal generators 12 can under control of microcontroller 3 to 13 output frequency of adder for 1KHz, width
Spend the sinusoidal scrambling signal for 50 millivolts；
Low-pass filter I5, for filtering out the sinusoidal signal component of 1KHz.
Full-wave rectifier I6, for by the sinusoidal signal full-wave rectification of 1KHz.
Low-pass filter II7, for filtering out low-frequency d component, suppresses high fdrequency component.
Bandpass filter 8, for filtering out the sinusoidal signal component of 2KHz.
Full-wave rectifier II9, for by the sinusoidal signal full-wave rectification of 2KHz.
Low-pass filter II I 10, for filtering out low-frequency d component, suppress high fdrequency component.
Multiplier 11 can do division arithmetic to two-way input signal, obtain offset error and correct voltage signal；
13 Neng Dui of adder, tri- tunnel input signals are added, and are obtained bias point and are corrected voltage, and the bias point is corrected
Bias voltage input of the voltage-drop loading to M-Z modulators.
The output terminal of the optical detection amplifier 1 respectively with A/D converter 2, low-pass filter I5 and bandpass filter 8
Input terminal connects；The A/D converter 2 is connected with microcontroller 3, the microcontroller 3 respectively with D/A converter 4,1KHz just
String signal generator 12 and multiplier 11 connect；The output terminal of the low-pass filter I5 connects with the input terminal of full-wave rectifier I6
Connect, the output terminal of the full-wave rectifier I6 is connected with the input terminal of low-pass filter II7；The output of the bandpass filter 8
End is connected with the input terminal of full-wave rectifier II9, and the output terminal of the full-wave rectifier II9 is defeated with low-pass filter III10's
Enter end connection；The output terminal of the low-pass filter II7 and low-pass filter III10 two input terminals with multiplier 11 respectively
Connection；The output terminal of the D/A converter 4,1KHz sinusoidal signal generators 12 and multiplier 11 respectively with adder 13 three
A input terminal connection；
Input terminal of the input terminal of optical detection amplifier 1 as quadrature bias point control device；The output terminal of adder 13
Output terminal as quadrature bias point control device.
For above-mentioned M-Z modulators quadrature bias point control device, the invention also provides a kind of control method, bag
Include：
In quadrature bias point control device operational process：The optical detection amplifier 1 can pass through second output terminal pair
The output optical signals of M-Z modulators 15 carries out continuous sampling, and obtained sampled signal is transferred to A/D converter 2, low respectively
Bandpass filter I5 and bandpass filter 8；The A/D converter 2 can be AD converted sampled signal in real time processing, and will obtain
Digital data transmission to microcontroller 3；The D/A converter 4 can be to microcontroller 3 output signal carry out DA conversions in real time
Processing, and by obtained signal transmission to adder 13；The bandpass filter 8, full-wave rectifier II9 and low-pass filter
III10 is denoted as the first filter module, and the low-pass filter I5, full-wave rectifier I6 and low-pass filter II7 are denoted as the second filter
Ripple module；
First filter module as follows can be filtered sampled signal in real time processing：The bandpass filter
2kHz sinusoidal signal components in 8 pairs of sampled signals are extracted, and by obtained signal output to full-wave rectifier II9；Entirely
Output signals of the ripple rectifier II9 to bandpass filter 8 carries out full-wave rectification processing, and by obtained signal output to low pass filtered
Ripple device III10；Low-frequency d component in output signals of the low-pass filter III10 to full-wave rectifier II9 extracts, i.e.,
Corresponding filtering signal 1 is can obtain, and obtained filtering signal 1 is transmitted to multiplier 11；
Second filter module as follows can be filtered sampled signal in real time processing：The low-pass filter
I5 extracts the 1kHz first harmonic components in sampled signal, and by obtained signal output to full-wave rectifier I6；Entirely
Output signals of the ripple rectifier I6 to low-pass filter I5 carries out full-wave rectification processing, and by obtained signal output to low pass filtered
Ripple device II7；Low-frequency d component in output signals of the low-pass filter II7 to full-wave rectifier I6 extracts, you can
Multiplier 11 is transmitted to corresponding filtering signal 2, and by obtained filtering signal 2；
The multiplier 11 can carry out filtering signal 1 and filtering signal 2 in real time division arithmetic and handle to obtain processing signal
1；The adder 13 can be real-time to the output signal of 4 three of multiplier 11,1KHz sinusoidal signal generators 12 and D/A converter
Carry out addition process and obtained processing signal 2 is loaded into the bias voltage input of M-Z modulators 15；
When quadrature bias point control device is just started to work, the output of multiplier 11 is in off state, microcontroller 3
First pass through D/A converter 4 and export scanning voltage to adder 13, meanwhile, microcontroller 3 is biased according to the digital signal
Point search operates, and after searching the current quadrature bias point of M-Z modulators 15, microcontroller 3 is by D/A converter 4 to addition
The bias voltage that persistently the quadrature bias point of output and M-Z modulators 15 matches of device 13, while exporting bias voltage, micro-control
Device 3 processed controls 1KHz sinusoidal signal generators 12 persistently to export the sinusoidal jitter signal of 1kHz to adder 13, exports biased electrical
While pressure, microcontroller 3 controls the output terminal gating of multiplier 11；；
Before 1KHz sinusoidal signal generators 12 export the sinusoidal jitter signal of 1kHz, the output of multiplier 11 is in pass
Disconnected state, at this time no signal be output to adder 13 from multiplier 11；Only when 1KHz sinusoidal signal generators 12 are lasting defeated
While going out the sinusoidal jitter signal of 1kHz, microcontroller 3 just controls the output terminal of multiplier 11 to gate, when quadrature bias point is sent out
During raw drift, filtering signal 1 and filtering signal 2 are not zero, and multiplier 11 carries out filtering signal 1 and filtering signal 2 at this time
The processing signal 1 that division arithmetic obtains is that the offset error of quadrature bias point corrects voltage, and the offset error is corrected electricity
Pressure is output to adder 13；It is real-time that adder 13 corrects offset error voltage, the sinusoidal jitter signal of 1kHz and bias voltage
Carry out the bias voltage input that the processing signal 2 that addition process obtains is loaded into M-Z modulators 15.
The operation principle of the present invention is：Quadrature bias point control device modulates M-Z by analog circuitry processes technology
1% component of device output signal light is persistently handled, and the amendment voltage constant feedback for obtaining quadrature bias point is loaded into M-Z tune
The bias voltage input of device processed, so as to fulfill the locking control to the quadrature bias of M-Z modulators point.
The M-Z modulators of the present invention are with quadrature bias point control device by a large amount of in high speed optical communication Transmission system
It is demonstrated experimentally that the device can realize that the quadrature bias point of M-Z modulators stablizes control within the temperature range of -55 DEG C -+80 DEG C
System, and the M-Z modulators quadrature bias point control device of the prior art can only work within the temperature range of 0 DEG C -+70 DEG C；And
The M-Z modulators of the present invention are high with quadrature bias point control device control accuracy, and harmonics restraint ratio is more than 55dB；And this is orthogonal partially
It is very small to put a control device volume, is easily integrated.The M-Z modulators quadrature bias point control device of the present invention also extensively may be used
Applied to Microwave photonics or distributed optical fiber sensing system.
Claims (2)
- A kind of 1. M-Z modulators quadrature bias point control device, it is characterised in that：The quadrature bias point control device includes Optical detection amplifier (1), A/D converter (2), microcontroller (3), D/A converter (4), low-pass filter I (5), full-wave rectification Device I (6), low-pass filter II (7), bandpass filter (8), full-wave rectifier II (9), low-pass filter III (10), multiplier (11), 1KHz sinusoidal signal generators (12) and adder (13)；The output terminal of the optical detection amplifier (1) respectively with A/D converter (2), low-pass filter I (5) and bandpass filter (8) input terminal connection；The A/D converter (2) is connected with microcontroller (3), and the microcontroller (3) turns with D/A respectively Parallel operation (4), 1KHz sinusoidal signal generators (12) and multiplier (11) connection；The output terminal of the low-pass filter I (5) with it is complete The input terminal connection of ripple rectifier I (6), the output terminal of the full-wave rectifier I (6) and the input terminal of low-pass filter II (7) Connection；The output terminal of the bandpass filter (8) is connected with the input terminal of full-wave rectifier II (9), the full-wave rectifier II (9) output terminal is connected with the input terminal of low-pass filter III (10)；The low-pass filter II (7) and low-pass filter III (10) output terminal is connected with two input terminals of multiplier (11) respectively；The D/A converter (4), 1KHz sinusoidal signals hair The output terminal of raw device (12) and multiplier (11) is connected with three input terminals of adder (13) respectively；Output terminal of the output terminal of the adder (13) as quadrature bias point control device；The multiplier (11) can do division arithmetic to two-way input signal；The tri- road input voltage signals of adder (13) Neng Dui carry out summation operation.
- 2. a kind of M-Z modulators control method of quadrature bias point control device, involved hardware include：Laser (14), M-Z modulators (15), photo-coupler (16) and quadrature bias point control device, the quadrature bias point control device bag It is whole to include optical detection amplifier (1), A/D converter (2), microcontroller (3), D/A converter (4), low-pass filter I (5), all-wave Flow device I (6), low-pass filter II (7), bandpass filter (8), full-wave rectifier II (9), low-pass filter III (10), multiplication Device (11), 1KHz sinusoidal signal generators (12) and adder (13)；The output terminal of the optical detection amplifier (1) respectively with A/D converter (2), low-pass filter I (5) and bandpass filter (8) input terminal connection；The A/D converter (2) is connected with microcontroller (3), and the microcontroller (3) turns with D/A respectively Parallel operation (4), 1KHz sinusoidal signal generators (12) and multiplier (11) connection；The output terminal of the low-pass filter I (5) with it is complete The input terminal connection of ripple rectifier I (6), the output terminal of the full-wave rectifier I (6) and the input terminal of low-pass filter II (7) Connection；The output terminal of the bandpass filter (8) is connected with the input terminal of full-wave rectifier II (9), the full-wave rectifier II (9) output terminal is connected with the input terminal of low-pass filter III (10)；The low-pass filter II (7) and low-pass filter III (10) output terminal is connected with two input terminals of multiplier (11) respectively；The D/A converter (4), 1KHz sinusoidal signals hair The output terminal of raw device (12) and multiplier (11) is connected with three input terminals of adder (13) respectively；Output terminal of the output terminal of the adder (13) as quadrature bias point control device；The multiplier (11) can do division arithmetic to two-way input signal；The tri- road input voltage signals of adder (13) Neng Dui carry out summation operation；The light carrier input terminal of M-Z modulators (15) is connected with a laser (14), the output terminal and a light of M-Z modulators (15) Coupler (16) connects, and photo-coupler (16) is single-input double-output, the first output terminal of the photo-coupler (16) and second defeated Outlet splitting ratio is 99:1, second output terminal is connected with the input terminal of optical detection amplifier (1), the adder (13) Output terminal is connected with the bias voltage input of M-Z modulators (15)；It is characterized in that：In quadrature bias point control device operational process：The optical detection amplifier (1) can pass through described second Output terminal carries out continuous sampling to the output optical signal of M-Z modulators (15), and obtained sampled signal is transferred to A/D respectively Converter (2), low-pass filter I (5) and bandpass filter (8)；The A/D converter (2) can carry out sampled signal in real time AD conversion processing, and by obtained digital data transmission to microcontroller (3)；The D/A converter (4) can be to microcontroller (3) output signal carries out DA conversion process in real time, and by obtained signal transmission to adder (13)；The bandpass filter (8), full-wave rectifier II (9) and low-pass filter III (10) is denoted as the first filter module, the low-pass filter I (5), complete Ripple rectifier I (6) and low-pass filter II (7) are denoted as the second filter module；First filter module can be real to sampled signal When be filtered processing, and obtained filtering signal 1 is transmitted to multiplier (11)；Second filter module can believe sampling Number processing is filtered in real time, and obtained filtering signal 2 is transmitted to multiplier (11)；The multiplier (11) can be to filtering Signal 1 and filtering signal 2 carry out division arithmetic and obtain processing signal 1 in real time；The adder (13) can to multiplier (11), 1KHz sinusoidal signal generators (12) and the output signal of D/A converter (4) three carry out addition process and will obtain in real time Processing signal 2 is loaded into the bias voltage input of M-Z modulators (15)；When quadrature bias point control device is just started to work, the output of multiplier (11) is in off state, microcontroller (3) First pass through D/A converter (4) to adder (13) export scanning voltage, meanwhile, microcontroller (3) according to the digital signal into Row bias point search operation, after searching the current quadrature bias point of M-Z modulators (15), microcontroller (3) is changed by D/A Device (4) is biased to adder (13) bias voltage that persistently the quadrature bias point of output and M-Z modulators (15) matches, output While voltage, microcontroller (3) control 1KHz sinusoidal signal generators (12) are persistently exporting 1kHz just to adder (13) String dither signal, while exporting bias voltage, the output terminal gating of microcontroller (3) control multiplier (11)；First filter module is as follows filtered sampled signal processing：The bandpass filter (8) extracts the 2kHz sinusoidal signal components in sampled signal, and obtained signal is defeated Go out to full-wave rectifier II (9)；Full-wave rectifier II (9) carries out full-wave rectification processing to the output signal of bandpass filter (8), And by obtained signal output to low-pass filter III (10)；Low-pass filter III (10) is defeated to full-wave rectifier II's (9) The low-frequency d component gone out in signal is extracted, you can obtains corresponding filtering signal 1；Second filter module is as follows filtered sampled signal processing：The low-pass filter I (5) extracts the 1kHz first harmonic components in sampled signal, and obtained signal is defeated Go out to full-wave rectifier I (6)；Full-wave rectifier I (6) carries out full-wave rectification processing to the output signal of low-pass filter I (5), And by obtained signal output to low-pass filter II (7)；Output signals of the low-pass filter II (7) to full-wave rectifier I (6) In low-frequency d component extracted, you can obtain corresponding filtering signal 2.
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| CN109257103A (en) * | 2018-09-30 | 2019-01-22 | 武汉联特科技有限公司 | A kind of control method and system of M-Z modulator stabilization of operating point |
| CN111077820A (en) * | 2019-12-12 | 2020-04-28 | 太原理工大学 | System and method for controlling bias voltage of electro-optical modulator based on SoC FPGA |
| CN111342906A (en) * | 2020-03-20 | 2020-06-26 | 中国电子科技集团公司第五十四研究所 | MZM-based optical communication receiver optical power stabilizing system |
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