CN103630780B - Detector sensitivity optimal value and the Auto-Test System of overload values and method thereof - Google Patents
Detector sensitivity optimal value and the Auto-Test System of overload values and method thereof Download PDFInfo
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- CN103630780B CN103630780B CN201310601978.9A CN201310601978A CN103630780B CN 103630780 B CN103630780 B CN 103630780B CN 201310601978 A CN201310601978 A CN 201310601978A CN 103630780 B CN103630780 B CN 103630780B
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Abstract
The invention discloses a kind of avalanche detector sensitivity optimal value and the Auto-Test System of overload values and method thereof, this Auto-Test System includes being provided with the test fixture of device under test, Error Detector, control unit, attenuator, shunt and light source；This control unit is connected with this Error Detector, attenuator, light power meter respectively by cable；Under the control of this control unit, this Error Detector output signal of telecommunication is to light source, this light source luminescent outputs optical signals to shunt after decaying via the attenuator that control unit controls, one road optical signal input to light power meter and is fed back to control unit by shunt, one road optical signal inputs the device under test to test fixture, export to this Error Detector after the Electric signal processing of this test fixture device under test output, and the error code information of generation is fed back to control unit by Error Detector.The present invention can record sensitivity and the overload values of device under test automatically, and accuracy is high, improves the automaticity of system, reduces labor intensity.
Description
Technical field
The present invention relates to optical communication field, particularly relate to a kind of avalanche detector sensitivity optimal value and overload
The Auto-Test System of value and method thereof.
Background technology
The main test index of avalanche detector part is the breakdown reverse voltage (VBR) under different temperatures at present
Value, the dark current under different temperatures, the sensitivity under different temperatures, for the test of avalanche detector part
The most considerably long, especially can there is testing time length and test essence with the test of existing method of testing manually
Spend inadequate problem, when adding high tension apparatus manual test, easily cause maloperation (such as: voltage overshoot regulates,
Wrong plug pin etc.), damage device, it is impossible to accurately record sensitivity and the overload values of device under test, it is unfavorable for
The extensive application of sensitive detection parts.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of avalanche detector sensitivity
The figure of merit and the Auto-Test System of overload values and method thereof, can automatically record device under test sensitivity accurately and
Overload values.
For solving above-mentioned technical problem, the technical scheme is that and be achieved in that:
A kind of avalanche detector sensitivity optimal value and the Auto-Test System of overload values, it is characterised in that
It include being provided with the test fixture of device under test, Error Detector, control unit, attenuator, shunt and
Light source；This control unit is connected with this Error Detector, attenuator, light power meter respectively by cable；In this control
Under the control of unit processed, this Error Detector output signal of telecommunication is to light source, and this light source luminescent is via control unit control
Attenuator decay after output optical signals to shunt, a road optical signal is inputted to light power meter also by shunt
Feeding back to control unit, the device under test in a road optical signal input to test fixture, this test fixture is treated
Export after surveying the Electric signal processing of device output to this Error Detector, and the error code information feedback that Error Detector will produce
To control unit.
Preferably, described shunt is the optical branching device of 1:1.
Preferably, described Auto-Test System also includes treating for testing breakdown reverse voltage offer
Surveying the power meter of device detection required voltage, this power meter is electrically connected with this test fixture, and passes through cable
It is connected with described control unit.
Preferably, described Auto-Test System also includes the picoammeter for dark current test, this skin
This test fixture of An Jiyu is electrically connected with, and is connected with described control unit by cable.
The another kind of technical scheme that the present invention provides: a kind of avalanche detector sensitivity optimal value and overload values
Automatic test approach, comprising:
A, adjust attenuator and Error Detector is set, it is judged that whether Error Detector having error code produce, and by error code
Information feeds back in control unit；
If B produces without error code, then attenuator increases decay with the first setting value stepping and performs step A；
Otherwise perform step C；
C, attenuator reduce decay with the second setting value stepping, and again judge whether have error code in Error Detector
Produce；
If D produces without error code, then pass through light power meter read power information and feed back in control unit；
Otherwise perform step C.
Preferably, feeding back to the power information in control unit in step D is treating on test fixture
Survey sensitivity optimal value or the overload values of device.
Preferably, step C determining whether, the concrete steps that error code produces include: when setting
In judge whether each test point has error code to produce, if there being error code to produce, attenuator continuation with the second setting value
Stepping does not reduces decay, no and perform step D.
Preferably, before step A, also include step A0, the reverse breakdown of test device under test
Magnitude of voltage, specifically includes: apply a test Vpd pin on the Vpd pin of device under test by power meter
And the setting electric current of loop voltage between ground, and by the numerical value of this power meter this loop voltage of record；When this time
When road voltage is in the range of breakdown reverse voltage, system is properly functioning；Otherwise, system can automatic alarm.
Preferably, before step A, also include step A1, test dark current, specifically include:
A, determine difference parameter X and figure parameters Y, and the difference of counter circuit voltage and X or return
Road voltage and the product of Y；
B, judge whether test dark current, if test; would determine whether that loop voltage is the biggest with X difference
Whether the product in 0 or loop voltage and Y is more than 0, if it is performs step c；Otherwise perform step
Rapid d；
C, in picoammeter, read the test result of dark current；
D, show result of calculation on the control unit.
Preferably, described first setting value is 0.2dB, and described second setting value is 0.1dB.
The technique effect that the present invention reaches is as follows:
1, the present invention can record sensitivity and the overload values of device under test automatically, and accuracy is high, improves system
Automaticity, reduce manual operation, reduce labor intensity.
2, VBR, dark current, sensitivity and overload values can complete automatically in a set of test system, keep away
Exempt to test different parameters and need to build the complex situations of different test system, decreased operator's manual operation and survey
Examination equipment, has saved the testing time.
3, establish device foolproof function of wrong plug pin when test, operator, device under test can be installed and insert
Prompting is provided, it is to avoid damage device under test during wrong pin.
4, system is through accurately calculating required test voltage, and ensures accurately power supply, and can pass through
The electrostrictive coefficient that supplies in change control unit meets different high low bias test demands.
Accompanying drawing explanation
Fig. 1 is the structure of the Auto-Test System of avalanche detector sensitivity optimal value of the present invention and overload values
Schematic diagram, wherein " " represents that cable connects,Represent that optical fiber connects,
Represent and be electrically connected with；
Fig. 2 is the undercurrent of the automatic test approach of avalanche detector sensitivity optimal value of the present invention and overload values
Test flow chart；
Fig. 3 is the flow process of the automatic test approach of avalanche detector sensitivity optimal value of the present invention and overload values
Figure.
[critical piece symbol description]
1 control unit
2 Error Detectors
3 light sources
4 attenuators
5 light power meters
6 shunts
7 test fixtures.
Detailed description of the invention
As it is shown in figure 1, avalanche detector sensitivity optimal value of the present invention and the Auto-Test System of overload values
Mainly include control unit 1, Error Detector 2, light source 3, attenuator 4, light power meter 5, shunt 6 with
And test fixture 7 to be measured.Wherein, control unit 1 by cable respectively with Error Detector 2, attenuator 4,
Light power meter 5 is connected；Error Detector 2 is connected with test fixture 7, light source 3 respectively by cable；Light source 3,
The device under test of attenuator 4, shunt 6 and test fixture 7 passes sequentially through optical fiber and connects, and this light merit
Rate meter 5 is connected by optical fiber with shunt 6.
Under the control of control unit 1, this Error Detector 2 exports the signal of telecommunication to light source 3, and this light source 3 is luminous
Outputting optical signals to shunt 6 via after attenuator 4 decay that control unit 1 controls, shunt 6 is by one
Road optical signal input to light power meter 5 and feeds back to control unit 1, and a road optical signal inputs to test fixture 7,
Export to this Error Detector 2 after the Electric signal processing of this test fixture 7 device under test output, and Error Detector 2
The error code information of generation is fed back to control unit 1.
Wherein, described shunt 6 is the optical branching device of 1:1, therefore, inputs treating to test fixture 7
Survey device luminous power with by light power meter record and feed back in control unit show luminous power identical, just
In reading, the optical power value being applied on described device under test can be made to show more intuitively in control unit 1
On test interface.
The Auto-Test System of avalanche detector sensitivity optimal value of the present invention and overload values has wrong plug pin
Foolproof function, can remind when operator installs device under test wrong plug pin, it is to avoid damage device under test.
For realizing foolproof function, described Auto-Test System also includes to be measured for test on test fixture 7
The power meter 8 of the breakdown voltage of fixture, the voltage needed for this power meter also provides for the test of this device under test simultaneously.
This power meter 8 is electrically connected with this test fixture 7, and is connected with control unit 1 by cable.
Before the sensitivity optimal value and overload values of test device under test, need first to test the anti-of device under test
To breakdown voltage, (breakdown reverse voltage of every device is different, and system is to test the anti-of device under test
The judgement of pin definitions is carried out while breakdown voltage), for avoiding damaging device under test.It specifically includes:
By on the Vpd pin of the power meter 8 device under test on test fixture 7 apply one test Vpd pin with
The setting electric current of loop voltage between ground, and the numerical value of this loop voltage is recorded by this power meter 8；When this time
When road voltage is in the range of breakdown reverse voltage, system is properly functioning；Otherwise, system can automatic alarm.
The described electric current that sets is as safe constant current, generally a 10uA, and this electric current is for other pins
It is all safe for (Vcc or Vout of TIA).Judge whether loop voltage value falls normal reverse
In the interval of breakdown voltage (Vbr), in general, the loop voltage of other pins is interval much smaller than this；
The loop voltage value in interval will not report an error in systems, is prompted to operator, with avoid follow-up
Test is continued under error condition.
The automatic test of avalanche detector sensitivity optimal value of the present invention and overload values also includes for testing
The picoammeter 9 of dark current, this picoammeter 9 is electrically connected with this test fixture 7, and by cable with described
Control unit 1 is connected.
The testing procedure of dark current is as in figure 2 it is shown, specifically include:
Step 201, determine difference parameter X and figure parameters Y, and calculate at test breakdown reverse voltage
During the product of the difference of the loop voltage that records and X or this loop voltage and Y.
In the test of dark current, according to distribution and the reverse breakdown electricity of APD photo-detector optimum working zone
The relation of pressure, has two kinds of selected patterns, and one is to subtract each other relation (referred to as difference parameter with loop voltage value
X), one is and loop voltage value multiplication relationship (referred to as figure parameters Y).Both patterns are by producing
The test condition regulation of product.
Additionally, after determining X or Y, in addition it is also necessary to check dark current under this reverse bias voltage meets situation.
Step 202, judge whether test dark current.
If step 203 test, determine whether that loop voltage and X difference are whether more than 0 or loop electricity
Whether pressure is more than 0 with the product of Y, if it is performs step 204；Otherwise perform step 205.
Step 204, in picoammeter, read the test result of dark current；
Step 205, show result of calculation on the control unit.
After the breakdown reverse voltage and dark current testing device under test has been tested, obtain test further
The optimal value of device and overload values.As it is shown on figure 3, avalanche detector sensitivity optimal value of the present invention and mistake
The automatic test approach of load value includes:
Step 301, adjust attenuator and Error Detector is set.
Wherein, being adjusted the pad value of attenuator 4 by control unit 1, the light making light source 3 send can be smooth
Transmit the device under test to test fixture 7.According to different testing requirements, can be single by controlling further
Unit 1 adjusts the pad value of attenuator 4, to test the sensitivity optimal value of the device under test on test fixture 7
Or overload values.Light source 3 sends identical optical signal, decays this light when control unit 1 controls attenuator 4
When signal is primary optical signal, finally by light power meter record and to feed back in control unit the power of display be spirit
Sensitivity optimal value；When control unit 1 control attenuator 4 decay this optical signal be big optical signal time, finally by
Light power meter record the power feeding back to show in control unit are overload values.
Additionally, the reference optical power that the error code of precognition produces can be effectively improved testing efficiency.When uncertain,
First sample value can be obtained in the way of first taking to estimate, adjust attenuator 4 by control unit 1, make to decline
Subtract decay optical signal that light source sends of device 4 in the range of discreet value, then revise and directly exist in test below
Test is started in the range of this.
Step 302, judge Error Detector in whether have error code to produce.
Error code testing is relevant to products application, primary concern is that speed, pattern and the bit error rate；Pattern is usual
Using pseudo noise code, the bit error rate generally determines the testing time, and one times of speed he number of general employing is produced
Time, speed he number increase will improve the bit error rate confidence level.
After determining error code testing condition, the feedback of error code information constitutes system with the adjustment of input light source light power
The core of system algorithm.
If step 303 produces without error code, then attenuator increases decay with the first setting value stepping, is adjusted by light
Little, and continue executing with step 302.
Wherein, described first setting value is 0.2dB.
If step 304 has error code to produce, then attenuator reduces decay with the second setting value stepping, is adjusted by light
Greatly.
Wherein, described second setting value is 0.1dB.
Step 305, in the detection setting time, whether Error Detector there is error code to produce, if having, execution step 304,
Otherwise perform step 307.
Step 305 determining whether, the concrete steps that error code produces include: step 306, set the time
Interior judging whether each test point has error code to produce, if there being error code to produce, performing step 304, not no and perform step
Rapid 307.
In the process, needing detection within the setting time, all test points the most all do not have error code to produce.
Wherein, the number of test point=setting time/timing is long, and relevant parameter can be according in actual test process
Need set.
Step 307, point out recording powers of laser beam and preserve test data.
In this process, light power meter 5 record relevant power information and feed back in control unit 1,
And feed back to sensitivity optimal value or the overload values that the power information in control unit 1 is test fixture.
After the sensitivity optimal value obtaining test fixture or overload values, meeting on the test interface of control unit
Prompting " being completed, please change next device ", now system can automatically power off.
In test process, system can accurately calculate required test voltage, and ensures accurately power supply, and
The electrostrictive coefficient that supplies in being arranged by change test interface instrument meets different high low bias test demands.
The above, only presently preferred embodiments of the present invention, it is not intended to limit the protection model of the present invention
Enclose.
Claims (7)
1. an avalanche detector sensitivity optimal value and the Auto-Test System of overload values, it is characterised in that its
Including being provided with the test fixture of device under test, Error Detector, control unit, attenuator, shunt, luminous power
Meter and light source；This control unit is connected with this Error Detector, attenuator and light power meter respectively by cable；?
Under the control of this control unit, this Error Detector output signal of telecommunication is to light source, and this light source luminescent is via control unit control
Outputting optical signals to shunt after the attenuator decay of system, a road optical signal is inputted to light power meter also by shunt
Feeding back to control unit, the device under test in a road optical signal input to test fixture, this test fixture is to be measured
Export to this Error Detector after the Electric signal processing of device output, and the error code information of generation is fed back to control by Error Detector
Unit processed；Described Auto-Test System also includes for testing breakdown reverse voltage and providing device under test to test institute
Needing the power meter of voltage, this power meter is electrically connected with this test fixture, and by cable and described control unit
It is connected.
Avalanche detector sensitivity optimal value the most according to claim 1 and the Auto-Test System of overload values,
It is characterized in that, described shunt is the optical branching device of 1:1.
Avalanche detector sensitivity optimal value the most according to claim 1 and the Auto-Test System of overload values,
It is characterized in that, described Auto-Test System also include for dark current test picoammeter, this picoammeter with should
Test fixture is electrically connected with, and is connected with described control unit by cable.
4. an avalanche detector sensitivity optimal value and the automatic test approach of overload values, it is characterised in that its
Including:
A, the breakdown reverse voltage value of test device under test, specifically include: by power meter at the Vpd of device under test
The setting electric current of loop voltage between a test Vpd pin and ground is applied on pin, and by this power meter record
The numerical value of this loop voltage；When this loop voltage is in the range of breakdown reverse voltage, system is properly functioning；
Otherwise, system can automatic alarm；
Test dark current, specifically includes: a, determine difference parameter X and figure parameters Y, and counter circuit voltage
Product with the difference of X or loop voltage with Y；B, judge whether test dark current, if test; would enter one
Step judge loop voltage and X difference whether more than 0 or whether the product of loop voltage and Y is more than 0, as
Fruit is then to perform step c；Otherwise perform step d；C, in picoammeter, read the test result of dark current；d、
Show result of calculation on the control unit；
Adjust attenuator and Error Detector is set, it is judged that whether Error Detector having error code produce, and error code information is fed back to
In control unit；
If B produces without error code, then attenuator increases decay with the first setting value stepping and performs step A；Otherwise hold
Row step C；
C, attenuator reduce decay with the second setting value stepping, and again judge whether have error code to produce in Error Detector；
If D produces without error code, then pass through light power meter read power information and feed back in control unit；Otherwise hold
Row step C.
Avalanche detector sensitivity optimal value the most according to claim 4 and the automatic test approach of overload values,
It is characterized in that, feeding back to the power information in control unit in step D is the device under test on test fixture
Sensitivity optimal value or overload values.
Avalanche detector sensitivity optimal value the most according to claim 4 and the automatic test approach of overload values,
It is characterized in that, step C determining whether, the concrete steps that error code produces include: sentence within the setting time
Whether disconnected each test point has error code to produce, if there being error code to produce, attenuator continues to reduce with the second setting value stepping
Decay, not no and perform step D.
Avalanche detector sensitivity optimal value the most according to claim 4 and the automatic test approach of overload values,
It is characterized in that, described first setting value is 0.2dB, and described second setting value is 0.1dB.
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| CN103888184B (en) * | 2014-04-03 | 2016-05-11 | 中国科学院半导体研究所 | The visible light communication system bit error rate and luminous power relation measuring device and measuring method |
| CN109412685B (en) * | 2018-09-14 | 2020-10-02 | 武汉电信器件有限公司 | Semiconductor detector chip detection method |
| CN114062875A (en) * | 2021-11-18 | 2022-02-18 | 株洲时代新材料科技股份有限公司 | Device and method for testing impedance characteristics of rail insulation and parts thereof |
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| CN101179331B (en) * | 2006-11-08 | 2012-03-07 | 中兴通讯股份有限公司 | Automatic debugging method and system of optical module |
| US20120163813A1 (en) * | 2009-08-19 | 2012-06-28 | Renato Grosso | Improvements in optical networks |
| CN101908927B (en) * | 2010-06-17 | 2012-05-02 | 成都优博创技术有限公司 | Method for extrapolating and testing sensitivity of light receiving device |
| CN101997607A (en) * | 2010-12-01 | 2011-03-30 | 成都优博创技术有限公司 | Method for testing cost of optical channel |
| CN201898511U (en) * | 2010-12-20 | 2011-07-13 | 武汉元创光电科技有限公司 | Dedicated error code tester for 155Mb/s-300Mb/s optical module |
| CN202043109U (en) * | 2011-02-22 | 2011-11-16 | 东莞市铭普实业有限公司 | Automatic testing system of optical module integrated with transmission and reception |
| CN103401605B (en) * | 2013-07-12 | 2016-06-29 | 青岛海信宽带多媒体技术有限公司 | Room temperature based on hot-pluggable optical module debugs system and room temperature adjustment method |
| CN103389451B (en) * | 2013-07-24 | 2015-12-02 | 广东瑞谷光纤通信有限公司 | A kind of method of testing of avalanche photodide and proving installation |
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