CN108871593A - A kind of method of the High Precision Automatic balance of coherent detection system - Google Patents
A kind of method of the High Precision Automatic balance of coherent detection system Download PDFInfo
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- CN108871593A CN108871593A CN201810637172.8A CN201810637172A CN108871593A CN 108871593 A CN108871593 A CN 108871593A CN 201810637172 A CN201810637172 A CN 201810637172A CN 108871593 A CN108871593 A CN 108871593A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
- G01J2009/0211—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods for measuring coherence
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Abstract
The invention proposes a kind of methods of the High Precision Automatic balance of coherent detection system.In coherent detection system, signal light and local oscillator light export two-way after mixing, after detecting optical signal with detector to obtain electric signal, subtract each other to obtain difference mode signal, delay inequality and optical power difference as existing for two optical paths after mixing can then reduce common-mode rejection ratio.The present invention is added balance light path module and optical signal is delayed and is decayed, the delay inequality of two optical paths is fixed, it can be by controlling the length of two optical paths accurately come delay of control, and there are certain deviations for the optical power of two optical paths, after then needing data processing module to carry out real-time data processing to difference mode signal, corresponding information is fed back again and balances light path module to adjust the optical power of two optical paths, reaches the purpose of high-precision balance.The present invention can effectively realize the high-precision balance of two optical paths of coherent detection system, guarantee the long-term stable work of the system and improve the common-mode rejection ratio of the system.
Description
Technical field
The present invention relates to photodetection fields, more particularly to relevant detection, realize that two optical paths of coherent detection system are high
The balancing technique of precision, especially a kind of high-precision balance method of coherent detection system.
Background technique
Currently, detecting technique is divided into incoherent technique and coherent detection technology.The Opto-electrical Section of incoherent technique
System is not related to the coherence of light radiation directly in response to light radiation intensity.Coherent detection responds the coherent field of light radiation, Neng Goujian
Measure the amplitude of light wave, the information such as frequency and phase.Common-mode rejection ratio is a critically important technology in coherent detection system
Index, it refers to voltage amplification factor of the amplifier to difference mode signal and the ratio between the voltage amplification factor to common-mode signal, common mode
Inhibit ratio bigger, common-mode noise is smaller, and the sensitivity of related detection system is higher.
When carrying out the relevant detection of small-signal, need detection system that there is higher sensitivity.Most important one
Any is exactly the common-mode rejection ratio for promoting detection system.Ideally, the common-mode signal of related detection system should be 0, but
It is full symmetric to be that actual device can not be accomplished, therefore can generate common-mode signal, reduces system sensitivity.In coherent detection system
In, in order to improve common-mode rejection ratio, the phase and amplitude of the light pulse signal of two optical paths is needed strictly to correspond to.Therefore it needs to eliminate
The phase difference of two optical paths and the amplitude difference for balancing two optical paths guarantee coherent detection system worked well.On the other hand, by certainly
Balance optical path, which is adjusted, in dynamic feedback can make detection system clock keep higher common-mode rejection ratio, meet detectivity
Demand, increase detection system long-play stability.
Therefore, we have proposed a kind of High Precision Automatic balance method of coherent detection system, pass through dynamic feedback control
The common-mode rejection ratio of lifting system.This patent accurately controls mixing output two paths of signals in terms of phase and amplitude two：
On the one hand by controlling the length of two optical paths accurately come delay of control, on the other hand by data processing module to difference mode signal into
It after the real-time data processing of row, then feeds back corresponding information and balances light path module to adjust the optical power of two optical paths, make two light
The optical power high-precision on road balances, and the final purpose realized dynamic regulation and improve common-mode rejection ratio ensure that system for a long time
Steady operation.
Summary of the invention
(1) technical problems to be solved
Detect optical signal for the principle of coherent detection system zero-difference detection, the delay inequality as existing for two optical paths and
The difference of optical power, can reduce common-mode rejection ratio, and the present invention proposes a kind of high-precision balance method of coherent detection system.It is a kind of
Data processing is carried out according to the difference mode signal that the electric signal obtained after zero-difference detection subtracts each other, and processing result feedback is arrived
Light path module is balanced, light path module is then balanced and the time delay and optical power of two optical paths is adjusted, be finally reached two optical paths
The method of high-precision balance.
(2) technical solution
The present invention provides a kind of High Precision Automatic balance method of coherent detection system, and step mainly includes 4 steps：
Step 1：Coherent detection system detects optical signal；
Step 2：Processing module to difference mode signal carry out data processing, and feedback information to balance light path module；
Step 3：According to the information fed back, the length that light path module controls two optical paths is balanced, guarantees two-way light pulse
Alignment；
Step 4：According to the information fed back, light path module regulating optical power is balanced, the high-precision flat of two optical paths is reached
Weighing apparatus.
High Precision Automatic balance method suitable for coherent detection system, it is characterised in that step 1 coherent detection system is visited
The method of light signal is：The system uses the principle of zero-difference detection, converts light signals into electric signal, and by two path signal
Subtract each other to obtain difference mode signal and amplify, provides data for processing module.
High Precision Automatic balance method suitable for coherent detection system, it is characterised in that step 2 processing module is to differential mode
The processing method of signal is：Processing module carries out certain data processing to difference mode signal with certain algorithm, and according to processing
As a result judge whether two optical paths are in equilibrium state.If being in equilibrium state, feedback information keeps this to balance light path module
When delay and decaying；If being not at equilibrium state, feedback information adjusts delay at this time and declines to balance light path module
Subtract.
High Precision Automatic balance method suitable for coherent detection system, it is characterised in that step 3 balances light path module pair
The processing method of optical signal is：It can be by all the way or the balance light path module of two-way realizes the alignment of the light pulse of two optical paths.
According to the information fed back, the length that light path module adjusts two optical paths is balanced, and then adjusts the delay inequality of two optical paths, realizes two
The light pulse of optical path precisely aligns.
High Precision Automatic balance method suitable for coherent detection system, it is characterised in that step 3 balances light path module pair
The processing method of optical signal is：It can be by all the way or the balance light path module of two-way realizes the balance of the optical power of two optical paths.
According to the information fed back, decaying of the light path module adjusting to the optical power of two optical paths is balanced, and then adjusts the light of two optical paths
Difference power realizes the balance of the optical power of two optical paths.
(3) beneficial effect
1. the present invention carries out data processing, feedback to balance light path module by the difference mode signal obtained by zero-difference detection
It adjusts the time delay and optical power of two optical paths, to realize the high-precision balance of two optical paths, grows coherent detection system
Phase stable work.
2. the present invention can reduce common-mode signal, common-mode rejection ratio is improved.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram
Fig. 2 is the feedback algorithm flow chart of balancing circuit modules all the way
Specific embodiment
The present invention carries out data processing by the difference mode signal obtained by zero-difference detection, and feedback is come to balance light path module
The delay and optical power of two optical paths are adjusted, to realize the high-precision balance of two optical paths.Specific implementation steps have：
1. coherent detection system detects optical signal.Specific practice is that local oscillator light and signal light are passed through 50/50 point
After the mixing of beam device, two-way is exported, faint optical signal is changed into electric signal by photodiode, differential mode letter is obtained after subtracting each other
Number and amplify, obtained difference mode signal is supplied to processing module.
2. using processing module to difference mode signal carry out data processing, and feed back corresponding information to balance light path module,
The optical power for adjusting two optical paths reaches the optical power balance of two optical paths.Specific practice is whether analyze in difference mode signal has residual
Signal pulse, remaining signal pulse, then keep delay at this time if it does not exist, and remaining signal pulse, then adjust if it exists
The delay of section at this time；The amplitude of difference mode signal is judged whether in scheduled threshold value, if processing module control is driven in threshold value
Dynamic model block keeps output voltage at this time；If processing module controls the output voltage of drive module adjusting at this time outside threshold value.
3. balancing the delay inequality that light path module eliminates two optical paths.Specific practice is the analysis according to processing template as a result, flat
Weighing apparatus light path module accurately controls the length of two optical paths, and then adjusts the delay of two optical paths, realizes the essence of the light pulse of two optical paths
Really alignment.
4. balancing the optical power difference that light path module eliminates two optical paths.Specific practice is the output voltage according to drive module,
Balance light path module drives micro electronmechanical fibre optic attenuator to decay the optical power of two optical paths accordingly, realizes the light of two optical paths
Power-balance.
5. being adjusted in the balance light path module of coherent detection system using MEMS VOA (micro electronmechanical fibre optic attenuator)
The optical power of optical path.The attenuator size is small, and low energy consumption, and good mechanical stability, the response time is short, and driving voltage is low, Ke Yigen
Quickly optical power is adjusted according to the electric signal fed back.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (5)
1. a kind of High Precision Automatic balance method of coherent detection system, step mainly include：
Step 1：Coherent detection system detects optical signal；
Step 2：Processing module to difference mode signal carry out data processing, and feedback information to balance light path module；
Step 3：According to the information fed back, the length that light path module controls two optical paths is balanced, guarantees two-way light pulse alignment；
Step 4：According to the information fed back, light path module regulating optical power is balanced, reaches the high-precision balance of two optical paths.
2. the High Precision Automatic balance method of coherent detection system according to claim 1, which is characterized in that the step
1 coherent detection system detection optical signal method be：The system uses the principle of zero-difference detection, converts light signals into telecommunications
Number, and two path signal is subtracted each other to obtain difference mode signal and be amplified, data are provided for processing module.
3. the High Precision Automatic balance method of coherent detection system according to claim 1, which is characterized in that the step
2 processing modules are to the processing method of difference mode signal：Data processing module carries out centainly difference mode signal with certain algorithm
Data processing, and judge whether two optical paths are in equilibrium state according to processing result.If being in equilibrium state, feedback information is arrived
Light path module is balanced, delay and decaying at this time is kept；If being not at equilibrium state, feedback information to balance light path module,
Adjust delay and decaying at this time.
4. the High Precision Automatic balance method of coherent detection system according to claim 1, which is characterized in that the step
3 balance light path modules is to the processing method of optical signal：It can be by all the way or the balance light path module of two-way realizes two optical paths
Light pulse alignment.According to the information fed back, the length that light path module adjusts two optical paths is balanced, and then adjusts two optical paths
Delay inequality, realize two optical paths light pulse precisely align.
5. the High Precision Automatic balance method of coherent detection system according to claim 1, which is characterized in that the step
3 balance light path modules is to the processing method of optical signal：It can be by all the way or the balance light path module of two-way realizes two optical paths
Optical power balance.According to the information fed back, decaying of the light path module adjusting to the optical power of two optical paths is balanced, in turn
The optical power difference of two optical paths is adjusted, realizes the balance of the optical power of two optical paths.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749714A (en) * | 2004-09-13 | 2006-03-22 | Pmd技术有限公司 | Method and apparatus for delay-sensitive measurement of a signal |
| CN101917233A (en) * | 2010-08-29 | 2010-12-15 | 华中科技大学 | All-optical phase noise inhibition method for coherent detection |
| CN102271029A (en) * | 2011-09-13 | 2011-12-07 | 北京邮电大学 | method for realizing coding FSO (file system object) system based on sequential detection and spatial diversity |
| CN102318241A (en) * | 2011-07-12 | 2012-01-11 | 华为技术有限公司 | Method and device for removing time delay and optical communication system receiver |
| US20120162659A1 (en) * | 2010-12-28 | 2012-06-28 | Axsun Technologies, Inc. | Integrated Dual Swept Source for OCT Medical Imaging |
| CN103575408A (en) * | 2013-10-29 | 2014-02-12 | 桂林电子科技大学 | Coherent light detection system and method for optical fiber delay line phase control |
| CN106017521A (en) * | 2015-03-31 | 2016-10-12 | 冲电气工业株式会社 | Measuring apparatus and measuring method |
| CN107407828A (en) * | 2015-03-02 | 2017-11-28 | 华为技术有限公司 | Polarization state calibrator (PSA) |
| CN108182051A (en) * | 2018-01-26 | 2018-06-19 | 北京邮电大学 | A kind of unrelated quantum random number generator scheme in source using photoswitch |
-
2018
- 2018-06-20 CN CN201810637172.8A patent/CN108871593A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749714A (en) * | 2004-09-13 | 2006-03-22 | Pmd技术有限公司 | Method and apparatus for delay-sensitive measurement of a signal |
| CN101917233A (en) * | 2010-08-29 | 2010-12-15 | 华中科技大学 | All-optical phase noise inhibition method for coherent detection |
| US20120162659A1 (en) * | 2010-12-28 | 2012-06-28 | Axsun Technologies, Inc. | Integrated Dual Swept Source for OCT Medical Imaging |
| CN102318241A (en) * | 2011-07-12 | 2012-01-11 | 华为技术有限公司 | Method and device for removing time delay and optical communication system receiver |
| CN102271029A (en) * | 2011-09-13 | 2011-12-07 | 北京邮电大学 | method for realizing coding FSO (file system object) system based on sequential detection and spatial diversity |
| CN103575408A (en) * | 2013-10-29 | 2014-02-12 | 桂林电子科技大学 | Coherent light detection system and method for optical fiber delay line phase control |
| CN107407828A (en) * | 2015-03-02 | 2017-11-28 | 华为技术有限公司 | Polarization state calibrator (PSA) |
| CN106017521A (en) * | 2015-03-31 | 2016-10-12 | 冲电气工业株式会社 | Measuring apparatus and measuring method |
| CN108182051A (en) * | 2018-01-26 | 2018-06-19 | 北京邮电大学 | A kind of unrelated quantum random number generator scheme in source using photoswitch |
Non-Patent Citations (2)
| Title |
|---|
| 王春晖 等: "光束分束比对２μm平衡式相干探测系统信噪比影响的实验研究", 《光学学报》 * |
| 石倩芸 等: "相干光通信中平衡探测器的研究与测试", 《科学技术与工程》 * |
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