CN109580180A - A kind of light source relative intensity noise test macro - Google Patents
A kind of light source relative intensity noise test macro Download PDFInfo
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- CN109580180A CN109580180A CN201811504433.5A CN201811504433A CN109580180A CN 109580180 A CN109580180 A CN 109580180A CN 201811504433 A CN201811504433 A CN 201811504433A CN 109580180 A CN109580180 A CN 109580180A
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- light source
- photodetector
- circuit board
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- relative intensity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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Abstract
The invention discloses a kind of light source relative intensity noise test macro, including programmable optical attenuator, photodetector, optical fibre gyro main circuit board, feedback control circuit and for programmable optical attenuator, main circuit board, feedback control circuit, photodetector the power module of electric energy is provided；Light source to be measured accesses the input terminal of the programmable attenuator, and the output end of programmable attenuator is connect with photodetector, and the photodetector is connect with optical fibre gyro main circuit board, and optical fibre gyro main circuit board will access computer outside output signal；The DC level signal that the feedback control circuit picks out optical fibre gyro main circuit board feeds back to programmable attenuator.The present invention is directed to design of FOG, without expensive spectrum analyzer, has many advantages, such as that precision is high, small in size, at low cost, easy to use, by the key equipment in becoming optical fibre gyro research and producing, has important promotional value.
Description
Technical field
The present invention relates to light source fields, and in particular, to a kind of light source relative intensity noise test macro.
Background technique
Optical fibre gyro is currently one of most important component in research hotspot and inertia both domestic and external field.It is domestic at present
The annual output of optical fibre gyro is more than 30,000 axis, and precision is already close to 0.0001 °/h, and the gyroscope of 0.01 °/h and 0.001 °/h
It has been widely applied.Relative intensity noise is the main noise source of optical fibre gyro, constrains optical fiber gyroscope precision and further mentions
It is high.At present not comprising relative intensity noise one in the index of SLD light source and ASE light source, the reason is that being unable to test.But this
Influence of the index to optical fibre gyro is maximum, if it is possible to which quantitative test will have weight to light source and performance evaluation and Curve guide impeller
Want meaning.Corresponding instrument and equipment can accurately measure relative intensity noise not yet both at home and abroad at present, therefore develop relative intensity
Noise measuring system is significant.
At present can the equipment of testing light source noise mainly have noise milivoltmeter and spectrum analyzer.Noise milivoltmeter is mainly used
In the noise of the detector within the scope of test nominated bandwidth, its precision is lower, can not provide the spectrum information of noise.
Acquisition and analysis processing for noise spectrum, although spectrum analyzer can be realized.But spectrum analyzer is a kind of logical
It is mainly used for the measurement of electric signal, the noise model of electric signal and the noise of optical fibre gyro although precision is very high with equipment
Model difference is larger, can not really reflect the performance of optical fibre gyro.And spectrum analyzer biases toward analysis of high frequency noise
(GHz), and the characteristic frequency of spectrum gyro be kHz magnitude, the precision of spectrum analyzer is enough.In addition, spectrum analyzer volume
It is larger, expensive, it is inconvenient to use.
It is herein:
Relative intensity noise: referring to the fluctuation and oscillation of light source output power, be by light source spectrum Fourier components it
Between additional noise caused by beat frequency.The spectral width of relative intensity noise and light source is inversely proportional, be high-precision optical fiber gyro most
Main noise source.
Fibre optic gyroscope: being all solid state gyroscope based on Sagnac effect, is that inertia is led for detecting turning rate
Important component in boat system, is widely used in the weaponrys such as Aeronautics and Astronautics, navigation, land battlebus and petroleum is surveyed
Well, antenna position civil field.
FPGA: programmable gate array can realize various logic operation and control function by software programming.
SLD light source: super generating penetrates diode, and a kind of wide spectrum light source is used for middle low-precision optical fiber gyro.
ASE light source: Er-Doped superfluorescent fiber source, a kind of wide spectrum light source based on spontaneous radiation amplification are used for high-precision optical fiber top
Spiral shell.
Summary of the invention
Present invention solves the technical problem that being to overcome the deficiencies of existing technologies, a kind of light source relative intensity noise survey is provided
Test system, the detection technique based on optical fibre gyro design a kind of dedicated test equipment, realization pair for design of FOG
The test of light source relative intensity noise, measuring accuracy is high, and the system bulk is small, at low cost.
The object of the invention is achieved through the following technical solutions:
A kind of light source relative intensity noise test macro, including programmable optical attenuator, photodetector, optical fiber top are provided
Spiral shell main circuit board, feedback control circuit and be programmable optical attenuator, main circuit board, feedback control circuit, photodetector
The power module of electric energy is provided；Light source to be measured accesses the input terminal of the programmable attenuator, the output end of programmable attenuator
It is connect with photodetector, the photodetector is connect with optical fibre gyro main circuit board, and optical fibre gyro main circuit board will export
Computer is accessed outside signal；The DC level signal that the feedback control circuit picks out optical fibre gyro main circuit board, which is fed back to, to be compiled
Journey attenuator.
In the present solution, programmable attenuator is automatically controlled optical fibre device, change the loss of device by applying analog voltage, it is right
Optical power is normalized, by light power stabilising in the range of a very little, convenient for the detection of subsequent conditioning circuit；Photoelectricity is visited
It surveys device and optical power is converted into voltage；The feedback voltage of feedback control circuit control programmable attenuator；By optical fibre gyro
Digital signal carries out packing processing in FPGA after Simulation scale-up, AD acquisition, is transported in computer according to certain format；It is logical
Cross computer to analyze acquisition signal, change to obtain noise spectral distribution function by Fourier, can performance to light source into
Row analysis, evaluates the quality of light source.
Further, light source to be measured accesses programmable attenuator by FC/PC optical fiber connector.
Further preferably, pass through FC/PC type flanged joint, plug side between light source and programmable attenuator to be measured
Just.
Further, the photodetector selects PIN/FET type detector.This model noise of detector is small, and temperature is steady
It is qualitative good, it is especially identical with the state of optical fibre gyro, it can really reflect the noise characteristic of light source.
Further, the transimpedance of the photodetector is that selection is identical as high-precision optical fiber gyro parameter.
Further, the attenuation range of the programmable attenuator is at least 7~20dB.The programmable of the attenuation range declines
The demand of noise measuring system can be fully met by subtracting device.
Further, welding mode is used between the programmable attenuator and the optical fiber of photodetector, to reduce damage
Consumption, and improve stability.
Further, the photodetector and optical fibre gyro main circuit board are using welded connecting.
In order to further reduce volume, light source to be measured and photodetector pass through optical fibre gyro main circuit board and power module
Connection.Photodetector uses the power supply of optical fibre gyro main circuit board, without being directly connected with power module.
Compared with the existing technology, the invention has the benefit that
The present invention solves the problems, such as the relative intensity noise quantitative test of optical fibre gyro.It can be used for SLD light source and ASE light source
Research, is of great significance to light source and performance evaluation and Curve guide impeller.
In addition, the test macro can be also used for the optics devices such as research fiber optic loop, fiber coupler, integrated optical modulator
The noise characteristic of part, capability estimation and design considerations for optical device.
The present invention directlys adopt the detection circuit (the main battery plate of gyro) of optical fibre gyro, with the state of optical fibre gyro complete one
It causes, most can really reflect the performance of light source and optical device in optical fibre gyro.
The present invention is directed to design of FOG, without expensive spectrum analyzer, high, small in size, at low cost with precision,
Key equipment in becoming optical fibre gyro research and producing is had important promotional value by the advantages that easy to use.
Detailed description of the invention
Fig. 1 is 1 relative intensity noise test principle block diagram of embodiment.
Fig. 2 is 1 relative intensity noise test macro working principle diagram of embodiment.
Specific embodiment
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
Embodiment 1
The present embodiment provides a kind of light source relative intensity noise test macros.System block diagram is as shown in Figure 1.Including programmable
Optical attenuator, photodetector, optical fibre gyro main circuit board, feedback control circuit and be programmable optical attenuator, main circuit
Plate, feedback control circuit, photodetector provide the power module of electric energy；Light source to be measured accesses the defeated of the programmable attenuator
Enter end, the output end of programmable attenuator is connect with photodetector, and the photodetector and optical fibre gyro main circuit board connect
It connects, optical fibre gyro main circuit board will access computer outside output signal；The feedback control circuit picks out optical fibre gyro main circuit
The DC level signal of plate feeds back to programmable attenuator.
The output light of light source to be measured is connect through programmable attenuator with photodetector.Programmable attenuator is automatically controlled optical fiber
Device changes the loss of device, 0~30dB of Dissipation change range by applying analog voltage.The effect of programmable attenuator is
Optical power is normalized, by programmable attenuator by light power stabilising in the range of a very little, after being convenient for
The detection of continuous circuit.In implementation process, light source to be measured can access programmable attenuator by FC/PC optical fiber connector.Tool
Body, by FC/PC type flanged joint, plug is convenient.Because the optical power of every light source is different, the noise of different light sources can not
It compares, the output light of light source to be measured is applied into programmable attenuator by programmable attenuator by FC/PC optical fiber connector
Add analog voltage, the power of input light is normalized, Output optical power is stablized in a very a small range.
As a specific embodiment, photodetector selects PIN/FET type detector, and advantage is that noise is small, temperature
Degree stability is good, this is also detector used in optical fibre gyro.The transimpedance of photodetector is selected as 20K, with high-precision
Optical fibre gyro parameter is identical.The corresponding optical power for reaching detector is 100 μ W.The Output optical power of SLD light source is usually at present
The Output optical power of 0.5~1.5mW, ASE light source is usually 5~10mW, thus the attenuation range of programmable attenuator be 7~
20dB, in the dynamic range of programmable attenuator.
Welding mode is used between programmable attenuator and photodetector optical fiber, to reduce loss, and improves stability.
Photodetector is directly welded on main circuit board.Power module is main circuit board, feedback control circuit and can compile
The power supply of journey attenuator, detector connect on main circuit board, without individually power supply.
Main circuit board selects the mainboard of high-precision optical fiber gyro, really to reflect the performance of gyro.There is mould on main circuit board
Quasi- filter and amplification, AD acquisition, FPGA processor (programmable gate array) etc., are connect by USB interface with computer.After AD acquisition
Digital signal packing processing is carried out in FPGA, be transported in computer according to certain format.Computer is to acquisition signal
It is analyzed, changes to obtain noise spectral distribution function by Fourier, the performance of light source can be analyzed, to the quality of light source
It is evaluated.
Feedback control circuit takes out the DC level signal of photodetector from optical fibre gyro main circuit board, the signal
It is directly proportional to optical power, can be used for controlling the feedback voltage of programmable attenuator, and guarantee reach detector optical power it is steady
It is qualitative.For the DC level drift for preventing detector, the system of the present embodiment has self-calibration function, periodically to DC level into
Row calibration, to guarantee the accuracy of optical power.
As shown in Fig. 2, the working principle of the present embodiment is as follows:
Light source to be measured is normalized first.In the present solution, by optical power control in 100 μ W, to be visited with photoelectricity
Device is surveyed to match.Optical power normalization is to compare the DC level of photodetector by programmable attenuator, and feedback is to can compile
In the control circuit of journey attenuator.Photoelectric signal transformation is realized by PIN/FET detector, the transimpedance of PIN/FET is 20K,
It is consistent with high-precision optical fiber gyro.The DC component of PIN/FET signal is taken out first, for controlling programmable attenuator.
It is filtered, amplifies again, match its voltage magnitude with AD input voltage.AD sampling resolution is 16, and sample frequency is 10
~30MHz.Digital signal is handled in FPGA, is packaged according to certain data format, is transported to by USB interface
In computer.Computer can be acquired digital signal, and carry out Fourier transformation and spectrum analysis, obtain the noise of light source
Spectral distribution function.
By taking ASE test of light source as an example, it is assumed that Output optical power 5mW, then 17dB is lost in optical path difference device, reaches optical detector
Power is 100 μ W.The transimpedance of photodetector is selected as 20K, then DC voltage amplitude is about that (detector responsivity is about by 1.8V
For 0.9).AD digit is 16, sampling rate 10MHZ, acquires 1 minute signal data volume about 1.2Gbyte.The data pass through
USB interface is transported in computer and is handled, and analyzes its noise spectral property.
The present embodiment designs one in a creative way and may be implemented to the relative intensity noise of light source to be measured and determining for noise spectrum
The system for measuring examination, and the connection type of each component of system is optimized, it effectively prevents because connecting improper cause
Test error.The present embodiment is particularly suitable for the research and production of high precision fiber optic gyroscope.It is understood that being also suitable
It is tested in the relative intensity of other field light source.
Obviously, above-described embodiment is only intended to clearly illustrate technical solution of the present invention example, and is not
Restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description also
It can make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should be included in right of the present invention and want
Within the protection scope asked.
Claims (9)
1. a kind of light source relative intensity noise test macro, which is characterized in that including programmable optical attenuator, photodetector,
Optical fibre gyro main circuit board, feedback control circuit and be programmable optical attenuator, main circuit board, feedback control circuit, photoelectricity
The power module of detector offer electric energy；Light source to be measured accesses the input terminal of the programmable attenuator, programmable attenuator
Output end is connect with photodetector, and the photodetector is connect with optical fibre gyro main circuit board, optical fibre gyro main circuit board
Computer will be accessed outside output signal；The feedback control circuit picks out the DC level signal feedback of optical fibre gyro main circuit board
To programmable attenuator.
2. light source relative intensity noise test macro according to claim 1, which is characterized in that light source to be measured passes through FC/
PC optical fiber connector accesses programmable attenuator.
3. light source relative intensity noise test macro according to claim 2, which is characterized in that light source to be measured and programmable
Pass through FC/PC type flanged joint between attenuator.
4. light source relative intensity noise test macro according to claim 3, which is characterized in that the photodetector choosing
With PIN/FET type detector.
5. light source relative intensity noise test macro according to claim 4, which is characterized in that the photodetector
Transimpedance is that selection is identical as high-precision optical fiber gyro parameter.
6. according to claim 1 to light source relative intensity noise test macro described in 5 any one, which is characterized in that described
The attenuation range of programmable attenuator is at least 7~20dB.
7. light source relative intensity noise test macro according to claim 6, which is characterized in that the programmable attenuator
Welding mode is used between the optical fiber of photodetector.
8. light source relative intensity noise test macro according to claim 7, which is characterized in that the photodetector with
Optical fibre gyro main circuit board is using welded connecting.
9. light source relative intensity noise test macro according to claim 7 or 8, which is characterized in that light source and light to be measured
Electric explorer is connect by optical fibre gyro main circuit board with power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811504433.5A CN109580180A (en) | 2018-12-10 | 2018-12-10 | A kind of light source relative intensity noise test macro |
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| CN201811504433.5A CN109580180A (en) | 2018-12-10 | 2018-12-10 | A kind of light source relative intensity noise test macro |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850130A (en) * | 2019-10-18 | 2020-02-28 | 广东工业大学 | Broadband noise signal generator and signal generating method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006093628A2 (en) * | 2005-02-28 | 2006-09-08 | Honeywell International Inc. | Ultra-low rin fiber light source |
| EP2101146A2 (en) * | 2008-03-10 | 2009-09-16 | Honeywell International Inc. | Method and apparatus for monitoring angle random walk of a fiber optic gyroscope |
| EP2251641A1 (en) * | 2009-05-11 | 2010-11-17 | Honeywell International Inc. | Systems and methods for effective relative intensity noise (rin) subtraction in depolarized gyros |
| JP2012027547A (en) * | 2010-07-20 | 2012-02-09 | Mitsubishi Electric Corp | Image processing apparatus |
| CN102818565A (en) * | 2012-08-09 | 2012-12-12 | 浙江大学 | Suppression method of relative intensity noise of light source of fiber-optic gyroscope |
| CN104502071A (en) * | 2015-01-05 | 2015-04-08 | 哈尔滨工程大学 | Measuring and constructing method of broadband light source spectrum distribution function and self-correlation function |
| CN106706124A (en) * | 2016-11-29 | 2017-05-24 | 浙江大学 | Method of measuring light source relative intensity noise power spectrum density |
| CN107990886A (en) * | 2017-12-21 | 2018-05-04 | 中国船舶重工集团公司第七0七研究所 | There is the high-precision optical fiber gyro light channel structure for suppressing relative intensity noise |
| CN108152006A (en) * | 2017-12-05 | 2018-06-12 | 浙江大学 | The test device and method that a kind of back reflected laser ratio influences wideband light source |
-
2018
- 2018-12-10 CN CN201811504433.5A patent/CN109580180A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006093628A2 (en) * | 2005-02-28 | 2006-09-08 | Honeywell International Inc. | Ultra-low rin fiber light source |
| EP2101146A2 (en) * | 2008-03-10 | 2009-09-16 | Honeywell International Inc. | Method and apparatus for monitoring angle random walk of a fiber optic gyroscope |
| EP2251641A1 (en) * | 2009-05-11 | 2010-11-17 | Honeywell International Inc. | Systems and methods for effective relative intensity noise (rin) subtraction in depolarized gyros |
| JP2012027547A (en) * | 2010-07-20 | 2012-02-09 | Mitsubishi Electric Corp | Image processing apparatus |
| CN102818565A (en) * | 2012-08-09 | 2012-12-12 | 浙江大学 | Suppression method of relative intensity noise of light source of fiber-optic gyroscope |
| CN104502071A (en) * | 2015-01-05 | 2015-04-08 | 哈尔滨工程大学 | Measuring and constructing method of broadband light source spectrum distribution function and self-correlation function |
| CN106706124A (en) * | 2016-11-29 | 2017-05-24 | 浙江大学 | Method of measuring light source relative intensity noise power spectrum density |
| CN108152006A (en) * | 2017-12-05 | 2018-06-12 | 浙江大学 | The test device and method that a kind of back reflected laser ratio influences wideband light source |
| CN107990886A (en) * | 2017-12-21 | 2018-05-04 | 中国船舶重工集团公司第七0七研究所 | There is the high-precision optical fiber gyro light channel structure for suppressing relative intensity noise |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850130A (en) * | 2019-10-18 | 2020-02-28 | 广东工业大学 | Broadband noise signal generator and signal generating method thereof |
| CN110850130B (en) * | 2019-10-18 | 2022-04-19 | 广东工业大学 | Broadband noise signal generator and signal generating method thereof |
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Application publication date: 20190405 |