CN108155950B - A kind of high-speed type homodyne detection system of gain-adaptive - Google Patents
A kind of high-speed type homodyne detection system of gain-adaptive Download PDFInfo
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- CN108155950B CN108155950B CN201711443098.8A CN201711443098A CN108155950B CN 108155950 B CN108155950 B CN 108155950B CN 201711443098 A CN201711443098 A CN 201711443098A CN 108155950 B CN108155950 B CN 108155950B
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- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 230000010287 polarization Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 claims 2
- 239000007787 solid Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 230000005622 photoelectricity Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
- H04B10/63—Homodyne, i.e. coherent receivers where the local oscillator is locked in frequency and phase to the carrier 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
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
-
- 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
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The present invention relates to a kind of high-speed type homodyne detection systems of gain-adaptive.Beam splitter, two photodetectors, I-V conversion module, double isolation buffer modules, gain-adaptive module, signal acquisition and control module, fixed gain wide dynamic range module, capture card；Beam splitter and measuring circuit are integrated, avoid error caused by due to detection circuit and beam splitter relative position are changed during the work time；Increase gain-adaptive part, measurement range can be widened；Increase a fixed gain wide dynamic range circuit in final stage, so that signal has a wide output area and has certain gain, improves anti-interference ability；Using high-speed chip, also guarantee higher processing speed simultaneously improving precision；It is powered using linear power supply, reduces noise.
Description
Technical field
The present invention relates to a kind of high-speed type homodyne detection systems of gain-adaptive, and beam splitter is integrated on pcb board, and
So that detection circuit has the characteristics such as the adaptive, high speed of gain, the invention belongs to coherent light communication technical fields.
Background technique
In optical communication field, to there are mainly two types of the detections of optical signal, one is ancient direct detection, another kind is close
The relevant detection being widely used for the communications field.Relevant detection is to increase local vibration compared to directly detecting maximum difference
It swings light source, signal light and local oscillator light and coupling is carried out as a branch of light to be detected by photo-coupler.Use the excellent of relevant detection
Point is: the high sensitivity that the remolding sensitivity of photoreceiver directly detects；Relevant detecting and selecting property is high, can be used for that channel spacing is small to be arrived
The Optical Frequency Multiplexing Technology of 1GHz~10GHz realizes multi-channel multiplexing, improves bandwidth utilization rate.Scheme that there are two types of relevant detections,
One kind is that heterodyne detects, and another kind is homodyne detection.Heterodyne detection sensitivity is not so good as homodyne detection, so generally being examined using homodyne
Survey scheme.And at present used in homodyne detection circuit a fixed gain is only used only so that detection signal range with
And measurement accuracy is all greatly limited, and beam splitter and detection circuit separation, be easy to cause detection electricity in use
Road and beam splitter relative position are changed, so that measurement inaccuracy.
To solve the above-mentioned problems, the present invention integrates beam splitter and measuring circuit, avoids during the work time
Error caused by due to detection circuit and beam splitter relative position are changed；Increase gain-adaptive part, survey can be widened
Measure range；Increase a fixed gain wide dynamic range circuit in final stage, so that signal has a wide output area and has
Certain gain improves signal driving, improves anti-interference ability；It is powered, while PBC large area applies ground, is reduced using linear power supply
The noises such as ripple.Using high-speed chip, also guarantee higher processing speed simultaneously improving precision.In conclusion the present invention mentions
Gone out it is a kind of it is integrated with photoelectricity, gain-adaptive, output area are big, high speed homodyne detection system.
Summary of the invention
It is an object of the invention to solve homodyne detection system to easily lead to error because photoelectricity is not integrated, gain is immutable to be led
The measurement range of cause is narrow, output area it is small so as to cause the not high technical problem of precision, and provide a kind of gain-adaptive
High-speed type homodyne detection system, reaches that photoelectricity is integrated, gain-adaptive, output area are big, high speed function.
To achieve the above object, the technical scheme is that a kind of high-speed type homodyne detection system of gain-adaptive,
Include:
Beam splitter is decomposed into two beams to any linearly polarized light of input, all the way output level polarised light, and another output is hung down
Straight polarised light, so that two-beam impinges perpendicularly on two photodetectors；
Two photodetectors receive horizontal polarization light and orthogonal polarized light respectively, convert optical signals to current signal,
Difference output is carried out to two current signals again；
The differential current signal obtained through two photodetectors is converted to voltage signal by I-V conversion circuit, is added simultaneously
With amplification；
Double isolation buffer circuits, internal there are two independent circuit module, one functions of modules is isolation signals acquisition electricity
Influence of the road to main circuit, secondly functions of modules is influence of the rear class of isolation main signal processing circuit to prime；
Signal acquisition and control circuit carry out signal acquisition to main circuit by double isolation buffer circuits and carry out at logic
Reason exports control signal and gives gain-adaptive circuit, while exporting control signal and giving PCI6111E synchronous capture card；
Gain-adaptive circuit obtains control signal from signal acquisition and control circuit, to establish gain channel to signal
It is handled；
Fixed gain wide dynamic range circuit provides a fixed gain for the signal of main circuit, so that linearly
Amplification；
PCI6111E synchronous capture card, detects signal, is shown, being saved, numerical operation.
In an embodiment of the present invention, the beam splitter is polarization beam apparatus, is integrated in entire homodyne detection system PCB
On circuit board, so that beam splitter is formed by two-beam road and optimally, is fixedly incident on two photodetector detection windows,
It not will receive extraneous interference and change.
In an embodiment of the present invention, the gain-adaptive circuit can obtain pre- from signal acquisition and control circuit
Amplified signal is established gain channel and is handled signal；The gain-adaptive circuit can be with double isolation buffer circuits
Obtained voltage level automatically provides gain channel, improves measuring circuit precision.
In an embodiment of the present invention, the gain formula of the I-V conversion circuit are as follows:
Wherein, AI-VFor the gain of I-V conversion circuit；RfFor the feedback resistance for being connected across output port and input negative terminal mouth；
ILFor photoelectric current.
In an embodiment of the present invention, the gain formula of the gain-adaptive circuit are as follows:
Avariety(dB)=40*Vcontrol+10
Wherein, AvarietyIt (dB) is the gain of gain-adaptive circuit；VcontrolFor the output of signal acquisition and control circuit
Voltage, this voltage input give gain-adaptive circuit.
In an embodiment of the present invention, the gain formula of the fixed gain wide dynamic range circuit are as follows:
Wherein, AendFor the gain of fixed gain wide dynamic range circuit；Rf_endTo be connected across output port and input negative terminal
The feedback resistance of mouth；RendFor the resistance of connection input negative terminal mouth and the output of prime signal.
In an embodiment of the present invention, the gain formula of the homodyne detection system are as follows:
A=AI-V*Avariety(dB)*Aend
Wherein, A is the gain of entire circuit；AI-VFor the gain of I-V conversion circuit；AvarietyIt (dB) is gain-adaptive
The gain of circuit；AendFor the gain of fixed gain wide dynamic range circuit.
Compared to the prior art, the invention has the following advantages: the present invention can achieve, photoelectricity is integrated, gain is adaptive
It answers, output area is big, high speed function.
Detailed description of the invention
Fig. 1 is the high-speed type homodyne detection system in the present invention for a kind of gain-adaptive of coherent optical detection.
Fig. 2 is the major part of b in Fig. 1.
Fig. 3 is the major part of g in Fig. 1.
Fig. 4 is the theoretical value and actual measured value about voltage gain, and Cong Tuzhong is this it appears that mainly there is four parts
Different gains embodies the function of gain-adaptive circuit.
Fig. 5 is the theoretical value of voltage gain and the absolute error of actual measured value, and Cong Tuzhong is this it appears that total mistake
Difference is no more than 10%, and with the raising of measured voltage, absolute error reduces.
Relationship of the Fig. 6 about input voltage and output voltage, Cong Tuzhong, available two information, first information are
Output voltage range is between 5V-11V, it is contemplated that the symmetry of circuit, total output voltage is in -11V-+11V range, body
Reveal wide dynamic electric voltage output；Second information embodies in entire voltage amplification area, there is the good linearity.
For Fig. 7 about under different input voltages, gain-adaptive Electric circuit selection different gains obtain different output.
Fig. 8 is the domain of the high-speed type homodyne detection system of gain-adaptive of the present invention, and signal wire is as short as possible, signal wire
Line footpath is consistent, large area covers copper ground connection, positive and negative 12V power supply is introduced into pcb board, is depressured to again by three linear regulated power supplies later
Required voltage.The above works so that measuring system guarantees low noise, raising signal-to-noise ratio.In power supply output pin and core
Piece power pins parallel connection 6.7uF capacitor stablizes chip operation, prevents self-excitation.Green portion in Fig. 8 is to install the portion of beam splitter
Point, it is ensured that it is mounted so as to work as, so that two-beam is incident on the detection window of two photodetectors with being respectively perpendicular.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
Refering to Figure 1, a kind of self-adapting high-speed type homodyne detection system, comprising:
Beam splitter a is decomposed into two beams to the polarised light by coding of input, and output level polarised light, another all the way
Road exports orthogonal polarized light, it is desirable that two-beam is incident on two photodetectors with being respectively perpendicular；
Two photodetector b receive horizontal polarization light and orthogonal polarized light respectively, convert optical signals to electric current letter
Number, operation, output difference current signal are carried out to the two current signals later；
The differential current signal obtained through photodetector is converted to voltage signal by I-V conversion circuit c, while into
Row amplification.I-V conversion circuit of the present invention is by taking OPA847 as an example, gain formula are as follows:
Wherein, AI-VFor the gain of I-V conversion circuit；RfFor the feedback resistance for being connected across output port and input negative terminal mouth；
ILFor photoelectric current.
Double isolation buffer circuit d, internal there are two independent circuit module, one functions of modules is isolation signals acquisition
Influence of the circuit to main circuit, secondly functions of modules is influence of the rear class of isolation main signal processing circuit to prime；
Gain-adaptive circuit e, gain-adaptive circuit can obtain pre-amplification letter from signal acquisition and control circuit
Number, it establishes a suitable gain channel and signal is handled.Adaptive gain of the present invention can be changed amplifying circuit with AD603
Example, gain formula are as follows:
Avariety(dB)=40*Vcontrol+10
Wherein, AvarietyIt (dB) is the gain of gain-adaptive circuit；VcontrolFor the output of signal acquisition and control circuit
Voltage, this voltage input give gain-adaptive circuit.
Signal acquisition and control circuit f, function are to carry out signal acquisition and logic to main circuit through isolation buffer circuit
Processing exports control signal and gives gain-adaptive circuit, while also exporting the NI company E series to rear class based on LabVIEW
PCI6111E synchronous capture card；
Fixed gain wide dynamic range circuit g makes signal have a wide output area and has certain gain, easily
In signal measurement.Fixed gain wide dynamic range circuit of the present invention is by taking THS4011 as an example, gain formula are as follows:
Wherein, AendFor the gain of fixed gain wide dynamic range circuit；Rf_endTo be connected across output port and input negative terminal
The feedback resistance of mouth；RendFor the resistance of connection input negative terminal mouth and the output of prime signal.
NI company E Series PC I6111E synchronous capture card h, signal can be detected, be shown, saved,
Numerical operation.
The j module collectively constituted by tri- modules of d, e, f completes signal feed forward detection, numerical operation, control signal output
Function.
In conclusion the gain formula of entire self-adapting high-speed type homodyne detection system are as follows:
A=AI-V*Avariety(dB)*Aend
Wherein, A is the gain of entire circuit；AI-VFor the gain of I-V conversion circuit；AvarietyIt (dB) is gain-adaptive
The gain of circuit；AendFor the gain of fixed gain wide dynamic range circuit.
After actual measurement, gain of the invention is 119-127dB, speed 73kHz.
It should be understood that particular embodiments described above of the invention, is used only for exemplary illustration or explains this
The principle of invention, but not to limit the present invention.Therefore, it is done without departing from the spirit and scope of the present invention
Any modification, equivalent replacement etc., should all be included in the protection scope of the present invention.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of high-speed type homodyne detection system of gain-adaptive characterized by comprising
Beam splitter is decomposed into two beams to any linearly polarized light of input, and output level polarised light, another output are vertically inclined all the way
Shake light, so that two-beam impinges perpendicularly on two photodetectors；
Two photodetectors receive horizontal polarization light and orthogonal polarized light respectively, convert optical signals to current signal, then right
Two current signals carry out difference output；
The differential current signal obtained through two photodetectors is converted to voltage signal, while being put by I-V conversion circuit
Greatly；
Double isolation buffer circuits, internal there are two independent circuit module, one functions of modules is that isolation signals are acquired and controlled
Influence of the circuit to main signal processing circuit, secondly functions of modules is shadow of the rear class to prime that main signal processing circuit is isolated
It rings；
Signal acquisition and control circuit carry out signal acquisition to main signal processing circuit by double isolation buffer circuits and patrol
Processing is collected, control signal is exported and gives gain-adaptive circuit, while exporting control signal and being acquired to PCI6111E synchronous
Card；
Gain-adaptive circuit obtains control signal from signal acquisition and control circuit, is carried out with establishing gain channel to signal
Processing；
Fixed gain wide dynamic range circuit provides a fixed gain for the signal of main signal processing circuit, so that signal
Linear Amplifer；
PCI6111E synchronous capture card, respectively with signal acquisition and control circuit, fixed gain wide dynamic range circuit
Connection detects control signal, is shown, is saved, numerical operation；
The beam splitter is polarization beam apparatus, is integrated in entire homodyne detection system PCB circuit board, so that beam splitter institute shape
At two-beam road optimally, be fixedly incident on two photodetector detection windows, not will receive extraneous interference and send out
It is raw to change.
2. a kind of high-speed type homodyne detection system of gain-adaptive according to claim 1, which is characterized in that the increasing
Beneficial adaptive circuit can obtain pre-amplified signal from signal acquisition and control circuit, establish gain channel to signal at
Reason；The gain-adaptive circuit can automatically provide gain channel with the voltage level that double isolation buffer circuits obtain,
Improve measuring circuit precision.
3. a kind of high-speed type homodyne detection system of gain-adaptive according to claim 1, which is characterized in that the I-
The gain formula of V conversion circuit are as follows:
Wherein, AI-VFor the gain of I-V conversion circuit；RfFor the feedback resistance for being connected across output port and input negative terminal mouth；ILFor
Photoelectric current.
4. a kind of high-speed type homodyne detection system of gain-adaptive according to claim 1, which is characterized in that the increasing
The gain formula of beneficial adaptive circuit are as follows:
Avariety(dB)=40*Vcontrol+10
Wherein, AvarietyIt (dB) is the gain of gain-adaptive circuit；VcontrolFor the output electricity of signal acquisition and control circuit
Pressure, this voltage input give gain-adaptive circuit.
5. a kind of high-speed type homodyne detection system of gain-adaptive according to claim 1, which is characterized in that described solid
Determine the gain formula of gain wide dynamic range circuit are as follows:
Wherein, AendFor the gain of fixed gain wide dynamic range circuit；Rf_endTo be connected across output port and input negative terminal mouth
Feedback resistance；RendFor the resistance of connection input negative terminal mouth and the output of prime signal.
6. a kind of high-speed type homodyne detection system of gain-adaptive according to claim 1, which is characterized in that described zero
The gain formula of poor detection system are as follows:
A=AI-V*Avariety(dB)*Aend
Wherein, A is the gain of entire circuit；AI-VFor the gain of I-V conversion circuit；AvarietyIt (dB) is gain-adaptive circuit
Gain；AendFor the gain of fixed gain wide dynamic range circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104954070A (en) * | 2015-06-15 | 2015-09-30 | 中国科学院光电技术研究所 | Self-adaptive optical fiber array type laser transmit-receive system used for spatial coherent light communication |
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| JP4061281B2 (en) * | 2004-03-16 | 2008-03-12 | アンリツ株式会社 | Optical pulse tester |
| US7809284B2 (en) * | 2006-06-23 | 2010-10-05 | Alcatel-Lucent Usa Inc. | System and method for receiving coherent, polarization-multiplexed optical signals |
| US8184992B2 (en) * | 2006-09-26 | 2012-05-22 | Hitachi, Ltd. | Optical field receiver and optical transmission system |
| CN101917233B (en) * | 2010-08-29 | 2012-11-07 | 华中科技大学 | All-optical phase noise inhibition method for coherent detection |
| CN202818311U (en) * | 2011-12-08 | 2013-03-20 | 昂纳信息技术（深圳）有限公司 | Coherent optical receiver |
| CN104218992B (en) * | 2014-09-15 | 2017-01-25 | 中国科学院半导体研究所 | Homodyne detection type coherent light transmission system |
| CN104253653B (en) * | 2014-09-19 | 2017-02-15 | 哈尔滨工业大学深圳研究生院 | Quaternary light polarization encoding and self-calibration wireless optical communication system and method |
| CN205847281U (en) * | 2016-06-20 | 2016-12-28 | 鞍山国扬通信科技有限公司 | A kind of 100G CFP optical module |
| CN106597366B (en) * | 2016-11-25 | 2019-04-19 | 湖北三江航天万峰科技发展有限公司 | A kind of signal processing system of photodetector |
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| CN104954070A (en) * | 2015-06-15 | 2015-09-30 | 中国科学院光电技术研究所 | Self-adaptive optical fiber array type laser transmit-receive system used for spatial coherent light communication |
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