CN105049113A - Active optical module multi-channel automatic test system and method - Google Patents
Active optical module multi-channel automatic test system and method Download PDFInfo
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Abstract
The invention provides an active optical module multi-channel automatic test system and a method. optimal signals emitted by a tested optical module are monitored, and indexes of the incident light power, emission current, bias current, temperature, voltage, extinction ratio, eye diagram allowance, crossing point, OMA (optical modulation amplitude) etc. are measured and calculated; if the above indexes are all in accordance with the standard, the sensitivity of the optical module is tested, the emission optical power of the tested module is enabled to reach the sensitivity of the test standard via the adjustment of an attenuator, and error code tests are conducted; and if there is no error code, indexes of alarm value and alarm recovery etc. of the optical module are tested. According to the test system, an error detector, an optical module test board, an optical power meter, and the attenuator employed by the test system are all multi-channel devices, an optical switch and an optical splitter are combined for time-sharing multiplexing of one oscilloscope, at least 8 modules can be simultaneously tested, the utilization rate of the oscilloscope and the test efficiency of the optical module are greatly optimized, the equipment cost and the manual cost are reduced, and automatic and batch production of the optical modules is realized.
Description
Technical field
The present invention relates to a kind of optic communication device measuring technology, particularly relate to a kind of automatic test approach and system of active light module, particularly can the test macro of simultaneously asynchronous test 8 or more active light module automatically.
Background technology
Along with progress and the development of information age, optical module is the basis of all information products, and in occupation of very important status, its huge market demand and high-precision index request force the testing efficiency of optical module and accuracy to improve.The traditional method of testing of this optical module is placed into by tested module in test board fixture, the index such as emission current, bias current, temperature, voltage of monitoring tested module; Read by oscilloscope and calculate the indexs such as extinction ratio, crosspoint, eye margin, OMA; Make the performance number of tested module reach sensitivity test point by regulated attenuator, test in a period of time whether have error code by Error Detector; By the warning value of regulated attenuator test tested module, the module bias current value etc. of alarm clearing value and acceptance point.
In traditional test process, need manually to carry out the work such as Fiber connection, equipment replacement frequently, workman wants the value of regulated attenuator limit, limit monitor power meter, makes it reach power test point; Whole test process manpower consumption is very large, and some valuable testing equipments are as very low in oscillographic utilization rate, and test accuracy also needs to be suspected.Along with product volume production, test job amount increases severely, and this mode of production can not meet Production requirement.
Summary of the invention
In order to solve the artificial of above-mentioned optical module test and equipment cost is high, testing efficiency is low problem, the invention provides a kind of active light module multichannel automatization test system and method, this test macro achieves the automatic test of optical module, a workman can test 8 modules at most simultaneously, has increased substantially production efficiency and has reduced cost of labor; Multiple test module time-sharing multiplex oscilloscope device, improves the utilance of expensive equipment, saves equipment expense; Test macro gathers automatically and logging test results replaces artificial, improves test accuracy and trackability.
The invention provides a kind of active light module multichannel Auto-Test System, comprising: testing and control main frame, multichannel Error Detector, multichannel programmable attenuator, optical module test board, C/L wavelength division multiplexer, program control optical switch, light oscilloscope, the program control light power meter of multichannel;
Described multichannel programmable attenuator, program control optical switch, light oscilloscope, the program control light power meter of multichannel, optical module test board and multichannel Error Detector can be connected communicatedly with described testing and control main frame;
Described optical module test board is provided with multiple module to be measured, and described module to be measured is active light module;
Each test channel of described multichannel Error Detector is connected with corresponding module to be measured respectively by test cable;
The road L-band light signal that described multichannel Error Detector exports is by being divided into multichannel debug signal after optical branching device, described multichannel debug signal carries out gain-adjusted by multichannel programmable attenuator, then by inputting described multiple module to be measured and the program control light power meter of described multichannel after corresponding C/L wavelength division multiplexer and 1:1 splitter respectively;
The C-band light signal that described multiple module to be measured exports, by after corresponding described C/L wavelength division multiplexer, inputs described smooth oscilloscope through described program control optical switch.
In technique scheme, the number of described multichannel Error Detector, multichannel programmable attenuator, the program control light power meter of multichannel, the number of channels of program control optical switch and the light splitting optical path quantity of optical branching device and described C/L wavelength division multiplexer is consistent with the quantity of described module to be measured, and the quantity of described module to be measured is more than or equal to 8.
In technique scheme, the mode of the road L-band light signal that described multichannel Error Detector exports is specially: the positive output port of described multichannel Error Detector exports electric debug signal, and described electric debug signal changes into the L-band standard sources signal for testing by electrical to optical converter.
In technique scheme, described testing and control main frame can be connected with described multichannel programmable attenuator, program control optical switch, light oscilloscope, the program control light power meter of multichannel, optical module test board and multichannel Error Detector communicatedly by serial ports or gpib interface or network interface, and each described module to be measured is in independently in test loop.
In technique scheme, described test loop can simultaneously asynchronously be tested, and each test loop does not interfere with each other, by the public light oscilloscope of time-sharing multiplex mode.
In technique scheme, described optical module test board is connected with the described tested module in each test channel, is measured the receptivity index obtaining each module to be measured, and report described testing and control main frame by described optical module test board; Described receptivity index comprises temperature, bias current, it is one or more to report in power.
The present invention also provides a kind of method using active light module multichannel Auto-Test System to carry out optical module test, it is characterized in that comprising the steps:
Step 1, powers up described active light module multichannel Auto-Test System;
Step 2, described testing and control main frame is powered up described tested module by described optical module test board, circulation is read its performance index and is judged whether the test channel residing for described tested module is stablized, after stable, read the parameters of described optical module test board in this test channel;
Step 3, described smooth oscilloscope is switched to this test channel by controlling program control optical switch by described testing and control main frame, reads the oscillographic every optic test index of described light;
Step 4, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, thus the input optical power adjusting described test module makes it arrive desired value Rn1, the test of reading now described test module reports power;
Step 5, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, thus the input optical power adjusting described test module makes it arrive desired value Rn2;
Step 6, whether described testing and control main frame at the appointed time section Inner eycle reads the result of described multichannel Error Detector in this test channel, detect and have error code to produce;
Step 7, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, and monitor the monitor value of described optical module test board in this test channel, until report LOS alarm, test the incident optical power of now described tested module;
Step 8, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, and monitor the monitor value of described optical module test board in this test channel, until LOS alarm disappears, test the incident optical power of now described tested module.
In technique scheme, in described step 1, the communication interface address of multichannel Error Detector, multichannel programmable attenuator, optical module test board, program control optical switch, light oscilloscope, the program control light power meter of multichannel described in described testing and control host record and relevant configured parameter are to configuration file, and when next time starts, default priority loads relevant information from described configuration file.
In technique scheme, also comprise described multichannel programmable attenuator calibration in described step 1; Temperature correction and the setting of extinction ratio correction factor are carried out to described smooth oscilloscope, the described extinction ratio correction factor method that arranges is: the standard component module of test is inserted the corresponding test channel of described optical module test board, by described program control optical switch, described smooth oscilloscope is switched to corresponding test channel, read described smooth oscilloscope delustring ratio, by the standard delustring ratio Lookup protocol extinction ratio correction factor of standard component module, the standard delustring ratio difference of extinction ratio reading and standard component module is made to be less than designated value.
In technique scheme, the test data that in described step 2, step 3, step 4, step 6, step 7 and step 8, testing and control main frame reads comprises: module bias current, temperature, voltage, to report in power, error condition, sensitivity, alarm, extinction ratio, crosspoint, eye margin, OMA index one or more, and described testing and control main frame is to these test datas in addition qualification determination be saved to test data form.
Compared with prior art, the invention has the beneficial effects as follows: increased substantially production efficiency, reduction cost of labor, improves the utilance of expensive equipment, and save equipment expense, test result gathers and record automatically, improves test accuracy and trackability.
Accompanying drawing explanation
Fig. 1 is the index path of test macro of the present invention;
Fig. 2 is system configuration topological diagram of the present invention;
Fig. 3 is the test test flow chart of system of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with execution mode and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.
A kind of active light module multichannel Auto-Test System provided by the invention, its light path as shown in Figure 1, this test macro comprises electrical to optical converter, light source splitter (1:N splitter), multichannel programmable attenuator, C/L wavelength division multiplexer, program control optical switch, light oscilloscope, the program control light power meter of multichannel, optical module test board and testing and control main frame (not shown in figure 1), wherein N be greater than 2 positive integer, be preferably 8.Program control optical switch is that N enters 1 and goes out optical switch (N*1 optical switch).Described programmable attenuator, program control optical switch, light oscilloscope, the program control light power meter of multichannel, optical module test board and multichannel Error Detector are connected with described testing and control main frame by serial ports or the communication interface such as gpib interface or network interface.The program control light power meter of multichannel programmable attenuator, multichannel, optical module test board and multichannel Error Detector are multiple channel test instrument, and each passage can form an independently test loop under program.
As shown in Figure 1, the positive output port (OUT+) of the passage 1 of multichannel Error Detector exports electric debug signal, the conversion from the signal of telecommunication to light signal is carried out by electrical to optical converter (standard sources module), this electric debug signal is changed into the L-band standard sources signal for testing, then N drive test examination light signal is divided into by 1:N splitter, optical power adjustment is carried out as required respectively in each optical test path passage of these testing light source signals input multichannel programmable attenuator, the attenuation range of every passage of this multichannel programmable attenuator is 0 ~ 30dB.
Specifically, in Fig. 1, tested module is exemplarily selected to be set to simplex optical module, be shown in Figure 1 for module 1 to the module 8 being arranged on and optical module test board corresponding to different test channel, in each test channel, use C/L wave band wavelength division multiplexer carry out the multiplexing of two different-waveband light signals accordingly thus, its operation principle is: the testing light source signal of the L-band in each test channel is inputted by the L mouth of C/L wave band wavelength division multiplexer, and export from the Co mouth (com port) of C/L wave band wavelength division multiplexer, the respective channel (passage 1 to the passage 8 on the program control power meter of multichannel) in corresponding tested module (i.e. module 1 to module 8) and the program control power meter of multichannel is outputted to respectively by 1:1 splitter, the C-band light signal that tested module is launched, back through 1:1 splitter, is inputted by the Co mouth (com port) of C/L wave band wavelength division multiplexer and is exported from the C mouth of C/L wave band wavelength division multiplexer, outputting to light oscilloscope by N*1 optical switch.The input of the L mouth of C/L wave band wavelength division multiplexer and the output of C mouth completely isolated, namely it is completely isolated for inputing to light path that Co mouth exports with inputing to from the Co mouth of C/L wave band wavelength division multiplexer the light path that C mouth exports from the L mouth of C/L wave band wavelength division multiplexer, and in fact the input of Co mouth to 1:1 splitter of C/L wave band wavelength division multiplexer and an output from 1:1 splitter to the optical fibre channel between module to be measured carry the L-band and C-band light signal distinguished in the two directions.
Optical module test board is connected with the tested module in each test channel, by optical module test board test each module to be measured temperature, bias current, report the receptivity indexs such as power.The L-band testing light source signal of input is carried out demodulation and is converted to the signal of telecommunication by the module to be measured in each test channel, exported by the RX port of respective channel on optical module test board, the positive input terminal (IN+) outputting to respective channel on multichannel Error Detector (passage 1 to the passage N on the corresponding multichannel Error Detector of N number of test channel difference) is connected, to test the reception error rate of each module to be measured by cable.Before the reception error rate test carrying out each module to be measured, need to make each test channel carry out synchronous with the signal of the first passage of multichannel Error Detector.
The negative output terminal (OUT-) of each test channel of multichannel Error Detector exports the electric debug signal of corresponding test channel, be connected respectively by the input TX of signal cable with optical module test board respective channel, with the respective channel of the electric debug signal input optical module test board by each test channel, and the signal input pin of the tested module in corresponding test channel is input to by the holding wire on optical module test board, by the module to be measured in each test channel, the electric debug signal of input is modulated into the light signal of C-band, to test the light quality indexs such as the eye pattern of module to be measured, described light signal carries the signal corresponding with 0/1 level in electric debug signal.The C-band light signal launched of module to be measured is back through the 1:1 splitter of corresponding test channel, C mouth through C/L wave band wavelength division multiplexer after Co mouth input C/L wave band wavelength division multiplexer exports, be connected with light oscilloscope by N*1 (N is greater than 8) optical switch, by switches light switch, the C-band light signal exported by the tested module of each test channel and described smooth oscilloscope conducting, arrive the oscillographic object of light described in time-sharing multiplex.
Above by simplex optical module is introduced the how logical Auto-Test System of active light module provided by the present invention as the illustrative examples of tested module, the optical module using other types is also feasible as tested module, when using two light module as tested module, tested module also can do corresponding adjustment to the annexation between 1:1 splitter and C/L wave band wavelength division multiplexer.
Fig. 2 is system configuration topological diagram, show signal wiring topological relation, testing and control main frame can be the personal computer, work station, server, embedded system etc. that are provided with specific test and measure software, testing and control main frame can be divided into client layer, operation layer, key-course, client layer provides and the graphic user interface of user interactions (GUI), operation layer performs control logic, and key-course provides the hardware communication interface with test macro.
As shown in Figure 2, testing and control main frame controls the equipment such as described multichannel Error Detector, light oscilloscope, N*1 optical switch by Ethernet; By device talks such as serial ports and optical module test board, the program control power meter of multichannel, multichannel programmable attenuators, control the power meter in each passage and attenuator; Optical module test board is communicated with monitored module to be measured by winding displacement.
Preferably, according to test macro definition testing process, realized the automatic test of product by testing software, its idiographic flow is as follows:
(1) testing and control main frame connects optical module test board, the program control power meter of multichannel, multichannel programmable attenuator, by Ethernet connecting multi-channel Error Detector, light oscilloscope, N*1 optical switch by serial ports.
(2) testing and control main frame carries out temperature correction and the setting of extinction ratio correction factor to light oscilloscope, calibrates multichannel programmable attenuator.
(3) testing and control main frame is compared to standard component, before the deadline whether check criteria part, if before the deadline, standard component is placed in certain test channel in optical module test board, standard component is powered up, switches light switch, to this test channel, reads luminous power, extinction ratio that light oscilloscope records; Regulate the yield value of multichannel programmable attenuator respective channel, make the power evaluation of corresponding test channel reach required value X1, the power obtaining this test channel in optical module test board reports value RxP1; Regulate the yield value of the corresponding test channel of multichannel programmable attenuator, make the power evaluation of corresponding test channel reach required value X2, the power obtaining this test channel in optical module test board reports value RxP2; 3 extrapolations are adopted to test the sensitivity of this test channel Plays part.The all test values obtained and standard value are compared, whether relative error scope within permission, if qualified, starts test below; Otherwise check criteria part and testing equipment.Each passage for testing, before testing, all needs to carry out a standard component comparison.
(4) testing and control main frame is powered up by the optical module to be measured of optical module test board to this test channel, whether circulation is read its test channel and is stablized, after stable, read each index of the optical module test board of this test channel, comprise that transmitting reports, bias current reports, temperature reports, voltage reports.
(5) whether the current smooth oscilloscope of testing and control host query is occupied, if just used, then wait for until it is idle, switches light switch is to this test channel, read light oscilloscope and survey each optical index, as luminous power, extinction ratio, crosspoint, eye margin, OMA etc.
(6) testing and control main frame regulates the yield value of attenuator in this test channel, monitor the luminous power in this test channel, until its value reaches Rn1, the reception testing the now optical module test board of this test channel reports value 1, calculates report error 1 according to standard gauge typical value.
(7) repeat step (6), make the value of power meter arrive Rn2, the reception testing the now optical module test board of this test channel reports value 2, calculates report error 2 according to standard gauge typical value.
(8) testing and control main frame regulates the yield value of attenuator in this test channel, adjust the input optical power of this tested optical module, it is made to arrive desired value R1, testing and control main frame at the appointed time section circulation reads the test result of Error Detector in this test channel, detect and whether have error code, if there is error code, illustrates that sensitivity test is defective, exit testing process.
(9) testing and control main frame regulates the yield value of attenuator in this test channel, and monitors the monitor value of this test channel glazing module testing plate, until it reports LOS alarm, record is the detected value of light power meter in this test channel now, is warning value;
(10) testing and control main frame regulates the yield value of attenuator in this test channel, and monitor the monitor value of this test channel glazing module testing plate, until LOS alarm disappears, record is the detected value of light power meter in this test channel now, is alarm clearing value;
(11) in test process, all test values are all recorded to form, and compared with test specification, if exceed code requirement, then show this test failure and exit testing process.
(12) repeat above-mentioned steps (4) ~ (11), all passages are tested.
Testing procedure (3) ~ (11) are the module testing flow process of an independent passage, this system can support that at most N channel is tested, each test channel is separate, can be independent and asynchronously carry out respective test, share an oscilloscope, coordinated to realize time-sharing multiplex by test program.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong to the protection range of technical solution of the present invention.
Claims (10)
1. an active light module multichannel Auto-Test System, is characterized in that comprising: testing and control main frame, multichannel Error Detector, multichannel programmable attenuator, optical module test board, C/L wavelength division multiplexer, program control optical switch, light oscilloscope, the program control light power meter of multichannel;
Described multichannel programmable attenuator, program control optical switch, light oscilloscope, the program control light power meter of multichannel, optical module test board and multichannel Error Detector can be connected communicatedly with described testing and control main frame;
Described optical module test board is provided with multiple module to be measured, and described module to be measured is active light module;
Each test channel of described multichannel Error Detector is connected with corresponding module to be measured respectively by test cable;
The road L-band light signal that described multichannel Error Detector exports is by being divided into multichannel debug signal after optical branching device, described multichannel debug signal carries out gain-adjusted by multichannel programmable attenuator, then by inputting described multiple module to be measured and the program control light power meter of described multichannel after corresponding C/L wavelength division multiplexer and 1:1 splitter respectively;
The C-band light signal that described multiple module to be measured exports, by after corresponding described C/L wavelength division multiplexer, inputs described smooth oscilloscope through described program control optical switch.
2. a kind of active light module multichannel Auto-Test System as claimed in claim 1, it is characterized in that: the number of described multichannel Error Detector, multichannel programmable attenuator, the program control light power meter of multichannel, the number of channels of program control optical switch and the light splitting optical path quantity of optical branching device and described C/L wavelength division multiplexer is consistent with the quantity of described module to be measured, and the quantity of described module to be measured is more than or equal to 8.
3. a kind of active light module multichannel Auto-Test System as described in claim 1-2, it is characterized in that: the mode of the road L-band light signal that described multichannel Error Detector exports is specially: the positive output port of described multichannel Error Detector exports electric debug signal, and described electric debug signal changes into the L-band standard sources signal for testing by electrical to optical converter.
4. a kind of active light module multichannel Auto-Test System as described in claim 1-3, it is characterized in that: described testing and control main frame can be connected with described multichannel programmable attenuator, program control optical switch, light oscilloscope, the program control light power meter of multichannel, optical module test board and multichannel Error Detector communicatedly by serial ports or gpib interface or network interface, each described module to be measured is in independently in test loop.
5. a kind of active light module multichannel Auto-Test System as described in claim 1-4, is characterized in that: described test loop can simultaneously asynchronously be tested, and each test loop does not interfere with each other, by the public light oscilloscope of time-sharing multiplex mode.
6. a kind of active light module multichannel Auto-Test System as described in claim 1-5, it is characterized in that: described optical module test board is connected with the described tested module in each test channel, measured the receptivity index obtaining each module to be measured by described optical module test board, and report described testing and control main frame; Described receptivity index comprises temperature, bias current, it is one or more to report in power.
7. use the active light module multichannel Auto-Test System according to any one of claim 1-6 to carry out a method for optical module test, it is characterized in that comprising the steps:
Step 1, powers up described active light module multichannel Auto-Test System;
Step 2, described testing and control main frame is powered up described tested module by described optical module test board, circulation is read its performance index and is judged whether the test channel residing for described tested module is stablized, after stable, read the parameters of described optical module test board in this test channel;
Step 3, described smooth oscilloscope is switched to this test channel by controlling program control optical switch by described testing and control main frame, reads the oscillographic every optic test index of described light;
Step 4, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, thus the input optical power adjusting described test module makes it arrive desired value Rn1, the test of reading now described test module reports power;
Step 5, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, thus the input optical power adjusting described test module makes it arrive desired value Rn2;
Step 6, whether described testing and control main frame at the appointed time section Inner eycle reads the result of described multichannel Error Detector in this test channel, detect and have error code to produce;
Step 7, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, and monitor the monitor value of described optical module test board in this test channel, until report LOS alarm, test the incident optical power of now described tested module;
Step 8, described testing and control main frame regulates the optical power attenuation value of this test channel by described multichannel programmable attenuator, and monitor the monitor value of described optical module test board in this test channel, until LOS alarm disappears, test the incident optical power of now described tested module.
8. carry out the method for optical module test as claimed in claim 7, it is characterized in that: in described step 1, the communication interface address of multichannel Error Detector, multichannel programmable attenuator, optical module test board, program control optical switch, light oscilloscope, the program control light power meter of multichannel described in described testing and control host record and relevant configured parameter are to configuration file, and when next time starts, default priority loads relevant information from described configuration file.
9. carry out the method for optical module test as claimed in claim 8, it is characterized in that: also comprise described multichannel programmable attenuator calibration in described step 1; Temperature correction and the setting of extinction ratio correction factor are carried out to described smooth oscilloscope, the described extinction ratio correction factor method that arranges is: the standard component module of test is inserted the corresponding test channel of described optical module test board, by described program control optical switch, described smooth oscilloscope is switched to corresponding test channel, read described smooth oscilloscope delustring ratio, by the standard delustring ratio Lookup protocol extinction ratio correction factor of standard component module, the standard delustring ratio difference of extinction ratio reading and standard component module is made to be less than designated value.
10. the active light module multichannel as claimed in claim 8 method of automatically testing, it is characterized in that: the test data that in described step 2, step 3, step 4, step 6, step 7 and step 8, testing and control main frame reads comprises: module bias current, temperature, voltage, to report in power, error condition, sensitivity, alarm, extinction ratio, crosspoint, eye margin, OMA index one or more, described testing and control main frame is to these test datas in addition qualification determination be saved to test data form.
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