CN103823175B - A kind of photodetection circuit frequency response function test method based on OTDR - Google Patents
A kind of photodetection circuit frequency response function test method based on OTDR Download PDFInfo
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Abstract
The present invention relates to a kind of photodetection circuit frequency response function test method based on OTDR, this method of testing includes test device, and it includes light-pulse generator generator, optical circulator, auxiliary optical fiber, detection circuit to be measured, data acquisition module and computer；Specific pulsewidth and the pulsed light of frequency that light-pulse generator generator sends enter optical circulator, entered in auxiliary optical fiber by optical circulator, the reflection light of optical fiber enters detection circuit to be measured by optical circulator, the photosignal of detection circuit to be measured output accesses data acquisition module, data acquisition module is responsible for and compunication, carry out spectrum analysis so that the signal of collection is passed to computer, frequency spectrum known to this frequency spectrum and light-pulse generator is carried out contrast and obtains the real frequency response characteristic of detection circuit.The method of testing of the present invention reflects the spectral characteristic of detection circuit to be measured truly, and structure composition is the most easily operated, and test mode is efficient and convenient.
Description
Technical field
The invention belongs to photodetection field, the test of a kind of photodetection circuit Frequency Response based on OTDR
Method, it is adaptable to the frequency response parameter testing of various photodetection circuit.
Background technology
In photodetection field, the frequency response of detection circuit directly affects the system reality to different spectral optical signal
Response, and then affect the system actual response ability to measured target.As in distributed temperature measuring system based on optical fiber, if
The frequency response of detection circuit is the lowest will directly affect the temperature measurement accuracy of system.Therefore, in various systems based on photodetection, visit
The frequency response function test of slowdown monitoring circuit will be critically important link.
Common method of testing is an off photo-detector, and simple utilizes various electro-kinetic instrument from the transmission characteristic of circuit
Measure the frequency response of detection circuit.Pumping signal owing to being actually added into is not the signal that detector truly provides, therefore
Test result certainty and physical presence different.
Having risen the method for testing of a kind of first harmonic Cleaning Principle based on lock-in amplifier recently, its ultimate principle is
Signal generator produces the sinusoidal signal of characteristic frequency to can the light source of external modulation be modulated, and the light after modulation changes by light
Electric explorer and the Circuit responce output signal of telecommunication thereof, this signal is phase locked amplifier and detects as first harmonic signal, so,
The sinusoidal signal frequency changing signal generator generation in certain limit can be obtained by the frequency response of detection circuit to be measured.Should
Method uses actual detector to export as pumping signal, can react the spy of detection circuit within the specific limits really
Property, but system is more complicated, is not suitable for integrated with other system, is difficulty with the automatization of test.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of photoelectricity based on OTDR
The method of testing of detection circuit Frequency Response.The method of testing of the present invention wants to reflect truly the frequency spectrum of detection circuit to be measured
Characteristic, and total composition is the most easily operated, and test mode is the most efficient and convenient.
In order to reach foregoing invention purpose, the technical scheme that the present invention provides is as follows:
A kind of photodetection circuit frequency response function test method based on OTDR, is provided with test device in this method of testing,
This test device includes light-pulse generator generator, optical circulator, auxiliary optical fiber, data acquisition module and computer, described
Optical circulator input connection light-pulse generator generator is to receive pulsed light, and an outfan of optical circulator connects auxiliary optical fiber
Launching light to receive, another outfan of optical circulator connects detection circuit to be measured, and the analogue signal of circuit under test output connects
Entering data acquisition module, this data acquisition module connects computer, and this method of testing comprises the following steps that
The first step, debugs light-pulse generator generator so that it is send the pulsed light of fixed pulse width and fixed frequency, this pulsed light
It is access in described optical circulator；
Second step, an outfan of described optical circulator connects auxiliary optical fiber, the length of this auxiliary optical fiber and pulsed light
Pulsewidth have a following relation: L ＞ 10*2*t*v, wherein L is the length of auxiliary optical fiber, and unit is rice, and t is pulsewidth, and unit is for receiving
Second, v is laser spread speed in a fiber, and unit is metre per second (m/s)；
3rd step, the reflection light in auxiliary optical fiber enters optical circulator, optical circulator outputs optical signals to detection to be measured
Circuit, the signal of circuit under test output accesses in data acquisition module, this data acquisition module output signal to circuit under test
Carry out analog to digital conversion, and the digital signal after change is sent to computer；
4th step, is carried out spectrum analysis by the computer digital signal to receiving, and with the light of light-pulse generator generator
Source pulse frequency spectrum contrasts, so that it is determined that the Frequency Response of detection circuit to be measured.
In present invention photodetection based on OTDR circuit frequency response function test method, described light-pulse generator generator
Or be laser pulse light source module, or for using the modulated light source of signal generator modulation.
In present invention photodetection based on OTDR circuit frequency response function test method, described data acquisition module is
Frequency is the high-Speed Data-Acquisition Module of 100MHz, and this data acquisition module uses RJ45 interface with the communication of computer.
In present invention photodetection based on OTDR circuit frequency response function test method, numeral is believed by described computer
Number carry out spectrum analysis: use the mathematical software matlab data to collecting to carry out fast Fourier FFT, drawing data
Spectrum curve, in order to reduce the system noise impact on signal as far as possible, take ten spectrum curves and be averaged, obtain numeral letter
Number final spectrum curve；Same also does identical spectrum analysis to light source pulse, draws the spectrum curve of light source pulse, and
Draw-3dB the curve of a light source pulse frequency spectrum；By the final spectrum curve of digital signal that obtains and light source pulse frequency spectrum-
3dB curve compares, and the frequency spectrum point of two curve intersections is the bandwidth of circuit under test, simultaneously curve from signal spectrum also
Can be seen that circuit under test flatness in same frequency band.
Based on technique scheme, present invention photodetection based on OTDR circuit frequency response function test method is in use
Achieve following technique effect: the optical principle that patent utilization of the present invention is basic, use the photosignal conduct of detector output
The driving source of test, can measure the detection circuit response in each frequency range really.Owing to using pulsed light as excitation
Signal, can reduce testing time significantly during use.It addition, when the gain of detection circuit is the highest, system uses annular
The reflected signal of auxiliary optical fiber measured by device will become the most necessary, so that whole system is easy to integrated be prone to commercialization.
Accompanying drawing explanation
Fig. 1 is the connection signal of present invention photodetection based on OTDR circuit frequency response function test method testing device
Figure.
Fig. 2 is the schematic flow sheet of present invention photodetection based on OTDR circuit frequency response function test method.
Detailed description of the invention
We combine accompanying drawing and specific embodiment and carry out the detection circuit frequency response function test method of the present invention below
Detailed description, in the hope of becoming apparent from the architectural feature understanding the present invention and the workflow that understand, but can not limit this with this
The protection domain of invention.
As it is shown in figure 1, in test device in present invention photodetection based on OTDR circuit frequency response function test method
Mainly include following several parts composition: this test device includes light-pulse generator generator 1, optical circulator 2, auxiliary optical fiber
3, data acquisition module 5 and computer 6.Wherein, optical circulator 2 input connect light-pulse generator generator 1 to receive pulsed light,
One outfan of optical circulator 2 connects auxiliary optical fiber 3 and launches light to receive, and another outfan of optical circulator 2 connects number
According to acquisition module 5, with by optical signal transmission to data acquisition module 5, this data acquisition module 5 connects computer 6.
Critical piece therein includes: 1. light-pulse generator.The light-pulse generator used in embodiment is upper hypo Correspondent letter
The laser pulse light source module of Science and Technology Ltd..This module is by electrical modulation continuous light source part exporting two with modulation pulse
It is grouped into.Modulation pulse output part output electric pulse signal, this signal is modulated final output optical pulse to continuous light source.
Pulsed light wavelength 1550nm, pulsewidth is 100ns, and frequency is 10KHz.Here light-pulse generator generator can also use signal to send out
The modulated light source of raw device modulation.
2. optical circulator.Optical circulator is responsible for collecting the reflected signal of auxiliary optical fiber.The Single port of circulator is light inlet,
Two-port netwerk connects auxiliary optical fiber, exports from three ports from the light of auxiliary fiber reflection, and three ports connect the photoelectricity in data acquisition module
Detection circuit 4, the light of reflection, as detection circuit to be measured, is acquired processing by this photodetection circuit 4.
3. auxiliary optical fiber.The telecommunication optical fiber of the auxiliary optical fiber employing standard in embodiment, a length of 500 meters.?
Short fiber length can calculate with following formula:
L=2*t*v
Wherein: L is short fiber length；
T is light impulse length；
V is laser spread speed in a fiber.
In order to obtain more preferable experiment effect, it is proposed that is selected by optical fiber is longer, is not the most less than 10 times of theoretical values.
4. data acquisition module.Data acquisition module uses the high-speed data acquisition of Shanghai Bohui Communication Technology Co., Ltd.
Module, sample frequency is 100MHz, and the communication with computer uses RJ45 interface.This data acquisition module is mainly by photodetection
Circuit and data acquisition circuit two parts composition, wherein photodetection circuit is responsible for retroreflection as detection circuit to be measured
Optical signal is converted to the signal of telecommunication and carries out suitable amplification, and amplification should be in a megohm magnitude；High Speed Data Acquisition Circuit will
The signal of telecommunication after amplification is sampled, and by RJ45 interface, the signal collected is uploaded to computer is analyzed.
5. computer.Use common PC.Matlab data processor, this journey is pre-installed in this computer
Sequence is responsible for the communication with data acquisition module and the analysis of digital signal.The frequency spectrum of signal is obtained, then to ten by fft analysis
Secondary frequency spectrum is averaging, and exports final signal spectrum.By-3dB the frequency of the final spectrum curve obtained and light source pulse frequency spectrum
Spectral curve compares, and can draw the bandwidth of circuit under test.
As in figure 2 it is shown, the main working process of present invention photodetection based on OTDR circuit frequency response function test method
As follows:
The first step, debugs light-pulse generator generator so that it is send the pulsed light of fixed pulse width and fixed frequency, this pulsed light
It is access in described optical circulator；
Second step, an outfan of described optical circulator connects auxiliary optical fiber, the length of this auxiliary optical fiber and pulsed light
Pulsewidth have a following relation: L ＞ 10*2*t*v, wherein L is the length of auxiliary optical fiber, and unit is rice, and t is pulsewidth, and unit is for receiving
Second, v is laser spread speed in a fiber, and unit is metre per second (m/s)；
3rd step, the reflection light in auxiliary optical fiber enters optical circulator, optical circulator outputs optical signals to data acquisition
In module, this data acquisition module optical signal to collecting carries out analog to digital conversion, and is sent extremely by the digital signal after change
In computer；
4th step, is carried out spectrum analysis by the computer digital signal to receiving, and with the light of light-pulse generator generator
Source pulse frequency spectrum contrasts, so that it is determined that the Frequency Response of detection circuit to be measured.
In present invention photodetection based on OTDR circuit frequency response function test method, numeral is believed by described computer
Number carry out spectrum analysis: use the matlab software data to collecting to carry out fast Fourier transform (fast Fourier
Transform, is called for short FFT), the spectrum curve of drawing data, in order to reduce the system noise impact on signal as far as possible, take
Ten times spectrum curve is averaged, and obtains the spectrum curve that digital signal is final；Same also does identical frequency to light source pulse
Analysis of spectrum, draws the spectrum curve of light source pulse, and draws-3dB the curve of a light source pulse frequency spectrum；The numeral letter that will obtain
Number final spectrum curve compares with-3dB the curve of light source pulse frequency spectrum, and the frequency spectrum point of two curve intersections is electricity to be measured
The bandwidth on road, simultaneously it is also seen that circuit under test flatness in same frequency band from signal spectrum curve.
The laser that in the method for testing of the present invention, light-pulse generator sends is in circulator enters auxiliary optical fiber, in a fiber
Can produce reflection light during transmission, this reflection light is entered in photodetection circuit to be measured by circulator, and photodetection circuit is by light
Signal is converted to the signal of telecommunication and supplies data acquisition circuit collection, and the signal collected uploads in host computer, by simple algorithm
It is carried out spectrum analysis.The frequency spectrum of the optical signal that light-pulse generator sends is known, by detection circuit output signal frequency
The contrast of spectrum and light-pulse generator signal spectrum i.e. can get the real Frequency Response of detection circuit.
Claims (4)
1. a photodetection circuit frequency response function test method based on OTDR, it is characterised in that be provided with in this method of testing
Test device, this test device includes light-pulse generator generator, optical circulator, auxiliary optical fiber, data acquisition module and calculating
Machine, described optical circulator input connection light-pulse generator generator is to receive pulsed light, and an outfan of optical circulator is even
Connecing auxiliary optical fiber and launch light to receive, another outfan of optical circulator connects detection circuit to be measured, circuit under test output
Analogue signal accesses data acquisition module, and this data acquisition module connects computer, and this method of testing comprises the following steps that
The first step, debugs light-pulse generator generator so that it is sending the pulsed light of fixed pulse width and fixed frequency, this pulsed light is connect
Enter to described optical circulator；
Second step, an outfan of described optical circulator connects auxiliary optical fiber, the length of this auxiliary optical fiber and the arteries and veins of pulsed light
Width has following relation: L ＞ 10*2*t*v, wherein L is the length of auxiliary optical fiber, and unit is rice, and t is pulsewidth, and unit is nanosecond, v
For laser spread speed in a fiber, unit is metre per second (m/s)；
3rd step, the reflection light in auxiliary optical fiber enters optical circulator, optical circulator outputs optical signals to detection circuit to be measured,
The signal of circuit under test output accesses in data acquisition module, and this data acquisition module carries out mould to the output signal of circuit under test
Transformation of variables, and the digital signal after change is sent to computer；
4th step, is carried out spectrum analysis by the computer digital signal to receiving, and with the light source arteries and veins of light-pulse generator generator
Rush frequency spectrum to contrast, so that it is determined that the Frequency Response of detection circuit to be measured.
A kind of photodetection circuit frequency response function test method based on OTDR the most according to claim 1, its feature exists
In, described light-pulse generator generator or be laser pulse light source module, or for using the modulated light of signal generator modulation
Source.
A kind of photodetection circuit frequency response function test method based on OTDR the most according to claim 1, its feature exists
In, described data acquisition module be frequency be the high-Speed Data-Acquisition Module of 100MHz, this data acquisition module and computer
Communication use RJ45 interface.
A kind of photodetection circuit frequency response function test method based on OTDR the most according to claim 1, its feature exists
In, described computer carries out spectrum analysis to digital signal: use the matlab software data to collecting to carry out quick Fu
Vertical leaf FFT, the spectrum curve of drawing data, in order to reduce the system noise impact on signal as far as possible, take ten frequency spectrum songs
Line is averaged, and obtains the spectrum curve that digital signal is final；Same also does identical spectrum analysis to light source pulse, draws
The spectrum curve of light source pulse, and draw-3dB the curve of a light source pulse frequency spectrum；The final frequency spectrum of digital signal that will obtain
Curve compares with-3dB the curve of light source pulse frequency spectrum, and the frequency spectrum point of two curve intersections is the bandwidth of circuit under test,
Simultaneously it is also seen that circuit under test flatness in passband from signal spectrum curve.
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| CN112858805B (en) * | 2020-12-29 | 2023-02-28 | 西南技术物理研究所 | Frequency response characteristic parameter measuring device for quadrant photoelectric detector |
| CN113091795B (en) * | 2021-03-29 | 2023-02-28 | 上海橙科微电子科技有限公司 | Method, system, device and medium for measuring photoelectric device and channel |
| CN114112006B (en) * | 2021-11-26 | 2024-08-16 | 中科传启（苏州）科技有限公司 | Noise monitoring method and device and electronic equipment |
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| JP2871547B2 (en) * | 1995-09-08 | 1999-03-17 | 日本電気株式会社 | Optical spectrum analyzer apparatus and optical amplifier control method |
| CN101793533A (en) * | 2010-03-12 | 2010-08-04 | 上海华魏光纤传感技术有限公司 | Optical fiber radiation sensing system and sensing method thereof |
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Address after: 201203 room 177, No. 203 blue wave road, Zhangjiang hi tech park, Shanghai Applicant after: SHANGHAI BANDWEAVER TECHNOLOGIES CO., LTD. Applicant after: Pinghu Bohui Communication Technology Co., Ltd. Address before: 201203, Shanghai Pudong New Area Zhangjiang hi tech park, No. 177 blue wave road, B District, 2 floor Applicant before: Shanghai Bohui Communication Technology Co., Ltd. Applicant before: Pinghu Bohui Communication Technology Co., Ltd. |
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Address after: Room 103, Building 299, Zhongchen Road, Songjiang District, Shanghai, 20113 Co-patentee after: Pinghu Bohui Communication Technology Co., Ltd. Patentee after: Shanghai Bohui Technology Co., Ltd. Address before: Room 203, 177 Bibo Road, Zhangjiang High-tech Park, Shanghai, 201203 Co-patentee before: Pinghu Bohui Communication Technology Co., Ltd. Patentee before: Shanghai Bandweaver Technology Co., Ltd. |