CN1398060A - Fast optical transmission module testing system and testing method thereof - Google Patents

Abstract

A test system and method for fast optical transmission module is characterized by that under the test environment of optical transmission module, by means of integration of several test instruments, the user can utilize said test system to quickly and synchronously measure several products so as to raise production efficiency.

Description

Fast optical transmission module testing system and testing method thereof

technical field

The present invention relates to a fast optical transmission module testing system and method, in particular to a test environment for an optical transmission module applied to a level one (Synchronous Transfer Mode 1, STM-1) of a synchronous transmission module. By integrating multiple test instruments, the user can test the system through the optical transmission module, and can quickly and simultaneously measure multiple products, thereby improving the test system and method of test efficiency.

Background technique

Since the best performance evaluation method of an optical transmission component is to calculate the probability that each bit sent from the transmitter will be wrong at the receiving end, the so-called bit error rate (Bit Error Ratio, BER), usually a set of bit error rate test The system includes a digital generator (Pulse PatternGenerator, PPG) and an error detector (Error Detector, ED). Please refer to Fig. 1, it is to show the implementation architecture diagram of the conventional optical transmission module test system, the conventional optical transmission module test system includes a digital data analyzer 1 (Digital Data Analyzer, DDA), wherein, the digital data analyzer 1 (DDA) has a data input terminal and a data output terminal, and can be combined with a digital generator 2 and a bit error detector 3 as a whole, and the user should first use an optical transmission module as a standard sample in actual measurement 4 (Golden Sample), to provide a standard light source for other optical transmission modules 5 (Transceiver) to be tested, generally the optical transmission module is placed at room temperature for measurement, and the optical transmission module 5 has a transmitter (Transmitter, Tx) and receiver (Receiver, Rx) two parts.

Please continue to refer to FIG. 2 , which is a flow chart showing a conventional optical transmission module testing method, and please refer to FIG. 1 together. In the general test method of optical transmission module, to test a complete optical transmission module must include the receiving end test (Rx) and the transmitting end test (Tx), and the transmitting end test must complete the spectrum analyzer measurement program 108 and The digital communication analyzer test program 109, first outputs the digital signal to the transmitter of the optical transmission module 5 (DUT) to be tested through the digital generator 2, and then transmits the signal to a digital communication analyzer 7 (Digital Communication Analyzer) through the transmitter. , DCA) and an optical spectrum analyzer 14 (Optical Spectrum Analyzer, OSA), the digital communication analyzer 7 is used to test the average power (Average power), extinction ratio (Extinction Ratio), jitter (Jitter), rise time (Rise Time), Falling Time (Falling Time), Eye Mask Test (Eye Mask Test) and Eye Width (Eye Width) and other parameters, and the optical spectrum analyzer 14 is used to test the center wavelength (Center Wavelength) and frequency of the optical signal Wide (Spectrum Bandwidth).

The receiving end test of the optical transmission module includes executing the procedure 101 for adjusting the input optical power. The digital generator 2 outputs a digital signal to the transmitter of a standard sample 4, and then transmits the signal to an optical attenuator 6 through the transmitter. (Attenuater, ATT), adjust the optical attenuator 6 according to the user's requirements to attenuate the optical signal energy in a predictable manner, and measure the input optical power of the optical transmission module 5 to be tested by an optical power meter 8 (Optical PowerMeter, OPM) At the same time, the attenuation signal is sent to the receiver end of the optical transmission module 5 to be tested, and sent to the error detector 3, so as to carry out the test point automatic search program 102, in order to seek the optimal position of the optical transmission module 5 to be tested After searching for the best test point, the bit error rate measurement program 103 uses the bit error detector 3 to measure the bit error rate of the signal, so as to calculate the error occurred in the receiver when the bit sent by the transmitter is calculated. the probability; program 104 judges whether the bit error rate measured by the optical transmission module 5 to be tested has completed all the measurement parameters; if not, then returns to program 101 to adjust the input optical power of the next test point; if so, then program 105 calculates The sensitivity (Sensitivity) of the optical transmission module 5 to be tested is shown.

Please refer to Figure 3, which is an explanatory diagram showing the principle of the sensitivity test of the optical transmission module. When all the measurement parameters are completed, the calculation result program 105 is executed, and the sensitivity 13 of the optical transmission module is calculated according to the input power and bit error rate of the measured receiver to evaluate its performance. As shown in FIG. 3 , when the receiving power of the error detector 3 (ED) decreases, the bit error rate will increase accordingly. Because the conventional optical transmission module testing system and method can only measure one product to be tested at a time, once the number of products to be tested increases, the time for production testing will also increase, and the production efficiency will be reduced. It is lengthy and wastes too much time, and it does not meet the economic cost and timeliness.

Therefore, the main purpose of the present invention is to provide a fast optical transmission module testing system and method. By integrating multiple testing instruments, users can quickly and simultaneously do multiple testing through the optical transmission module testing system. Product measurement, and then test system and method to improve test efficiency.

Contents of the invention

In view of the known technology, only one product can be measured at a time, and the number of tests cannot be effectively increased in response to the increase of products to be tested, and repeated single measurements will make the test time lengthy and waste too much time, not only It will reduce the efficiency of production, and it does not meet the economic cost and timeliness.

The present invention provides a test environment applied to optical transmission modules. Through the integration of multiple test instruments, users can quickly and synchronously measure multiple products through the optical transmission module test system, thereby improving production. Efficiency testing system and method, wherein an optical channel selector (Optical Channel selector, OCS) is combined with a group of digital communication analyzers and spectrum analyzers to switch multiple products to be tested for overall automatic detection, and Combined with a tree coupler (Tree Couple, TC), the measurement signal of the standard sample is transmitted synchronously to multiple products under test in a multi-port transmission mode to further measure the bit error rate. To enable users to obtain product analysis reports in line with real-time, thereby effectively enhancing the competitiveness of the industry

Description of drawings

FIG. 1 is an implementation architecture diagram of a conventional optical transmission module testing system;

Fig. 2 is a flow chart of a known optical transmission module testing method;

Figure 3 is an explanatory diagram of the principle of the sensitivity test of the optical transmission module;

Fig. 4 is the implementation architecture diagram of the fast optical transmission module testing system of the present invention;

FIG. 5A is a test flowchart of the first embodiment of the fast optical transmission module testing method of the present invention;

5B is a test flowchart of the second embodiment of the fast optical transmission module testing method of the present invention;

Fig. 6 is an explanatory diagram of the principle of testing the SD signal and sensitivity of the optical transmission module according to the present invention.

Description of figure number:

1- Digital Data Analyzer

2-digital generator

3-Bit Error Detector

4-Sample of standard optical transmission module

5-Optical transmission module to be tested

6- Optical attenuator

7-Digital Communication Analyzer

8-optical power converter

9-Multi-channel data bus

10-tree optical splitter

11-optical channel selector

12-Measurement parameter points

13- Sensitivity

14-Spectrum Analyzer

15-digital meter

101, 201, 211-Adjustment of input optical power program

102, 202-test point automatic search program

103, 203-measurement bit error rate program

104 - Measured parameter completion procedure

105, 205-calculation result program

106, 206 - Test Completion Procedures

107, 207-Switch the DUT program

108, 208-Spectrum Analyzer Measurement Procedures

109, 209-Digital Communication Analyzer Test Procedure

210, 212-digital ammeter measurement program

Detailed ways

While the invention will be fully described with reference to the accompanying drawings, which contain preferred embodiments of the invention, it should be understood before proceeding that those skilled in the art may modify the invention described herein while still obtaining the benefits of the invention. Therefore, it should be understood that the following description is a broad disclosure for those skilled in the art, and its content is not intended to limit the present invention.

Please refer to FIG. 4 , which is a diagram showing the implementation structure of the fast optical transmission module testing system of the present invention. In this embodiment of the present invention, fifteen test objects are used as the test quantity. As shown in Figure 4, the fast optical transmission module test system of the present invention is applied in the test environment of the first transmission module to provide the user with the test results of several products at the same time. In the transmission test program, by combining a The optical channel selector 11 enables the system to measure multiple products to be tested; and in the receiving test program, through a tree optical splitter 10, the signal bit error rates of multiple products to be tested can be converged through multi-channel data Row 9 acquires measurements simultaneously.

In a preferred embodiment of the present invention, a fast optical transmission module test system can test a plurality of optical transmission modules 5 to be tested. The test system includes: a digital data analyzer 1, which is used to output a digital signal To the transmitter of the standard optical transmission module 4, its transmitting end receives the signal output by the digital generator 2 and transmits it as the receiving samples of a plurality of optical transmission modules 5 to be tested; the multi-channel bus bar 9 (Multiplex Channel Data Bus), used as a signal transmission medium between the digital data analyzer 1 and the standard optical transmission module 4 and a plurality of optical transmission modules 5 to be tested; an optical attenuator 6, connected to the standard first transmission The transmitter output of the module sample 4 is used to attenuate the optical signal energy transmitted by the transmitter in a predictable manner; an optical power device 8 is arranged at the signal output end of the optical attenuator to measure the output Optical signal energy; and a tree-shaped optical splitter 10, which has a one-to-multiport optical splitting transmission function, and its signal input and output ends are respectively connected to the signal output of the attenuator 6 and each optical transmission module 5 to be tested The receiver is used to transmit the optical signal attenuated by the attenuator 6 to the receivers of the optical transmission modules 5 to be tested at the same time, and make the error detector 3 converge through multi-channel data Row 9 detects the receiver of the optical transmission module 5 to be tested, and measures the bit error rate of the signal synchronously, and calculates the probability that the bits sent by each transmitter are wrong in the receiver, and can simultaneously Test and evaluate the performance of a plurality of optical transmission modules 5 to be tested.

In addition, the fast optical transmission module test system of the present invention also includes: an optical channel selector 11, which has a multi-to-one selection function, and its input terminals are respectively connected to the transmitters of the optical transmission module 5 to be tested. To switch the output optical signal of each optical transmission module 5 to be tested to a digital communication analyzer 7 and/or a spectrum analyzer 14, to measure various parameters of the transmitter of the optical transmission module 5 to be tested; and a digital ammeter 15, for detecting the low voltage and high voltage of the SD signal (SD is the abbreviation of Signal Detect) of the receiver of each optical transmission module 5 to be tested.

Please refer to Fig. 5A, which shows the test flow chart of the first embodiment of the fast optical transmission module testing method of the present invention, and please refer to Fig. 4, according to the method implemented by the fast optical transmission module testing system of the present invention, this method includes receiving The test program and the transmission test program, the transmission test program includes the following:

Procedure 107: Switching the DUT

When measuring a plurality of products to be tested, the digital signal must first be transmitted by the digital generator 2 to the transmitters of the plurality of optical transmission modules 5 to be tested through the data bus 9, and combined with an optical channel selector 11 to switch in sequence The output optical signal of each optical transmission module 5 to be tested is sent to the digital communication analyzer 7 and/or the spectrum analyzer 14, and the spectrum analyzer measurement program 108 and or the digital communication analyzer test program 109 are carried out to measure the Various parameters of the transmitter of the transmission module 5 to be tested.

Procedure 108: Spectrum Analyzer Measurement Procedure

This procedure is to use the spectrum analyzer 14 to measure the central wavelength and bandwidth of the optical signal that the digital generator 2 transmits the digital signal to a plurality of transmitters of the optical transmission module 5 to be tested through the data bus 9 .

Procedure 109: Digital Communications Analyzer Test Procedure

This program is to use the digital communication analyzer 7 to measure the parameters of the transmitter side of a plurality of optical transmission modules 5 to be tested, including average power, extinction rate, jitter, rise time, fall time, eye mask test and eye Parameters such as image width.

Procedure 106: Test Completion

This program is to verify whether the plurality of products to be tested are all switched in sequence by the optical channel selector 11 to complete the measurement of the optical signal power and waveform parameters of the program 108 and 109; if so, then end the transmission test program; otherwise Go back to program 107 again, continue to switch to the next product under test by means of the optical channel selector 11, and start again from program 107 until all the products under test are completely measured.

In the method implemented by the fast optical transmission module testing system of the present invention, its receiving test (Rx) program includes as follows:

PROCEDURE 101: ADJUSTING INPUT OPTICAL POWER

First, the digital generator 2 will output a digital signal to the transmitter of the standard optical transmission module sample 4, and then the signal will be transmitted to an optical attenuator 6 through the transmitter, and the optical attenuator 6 will be adjusted each time according to the user's requirements. The energy of the optical signal is attenuated predictably, so that the input optical power increases from small to large, and an optical power device 8 measures the input optical power of the optical transmission module 5 to be tested, and guides the optical signal attenuated by the optical attenuator 6 The optical signal is sent to a tree optical splitter 10 , and the optical signal is sent to the receiver of each optical transmission module 5 to be tested by the multi-port transmission function of the tree optical splitter 10 to perform the procedure 102 .

Procedure 102: Automatic search for test points

This procedure is that when the optical signal is transmitted to the receivers of the plurality of optical transmission modules 5 to be tested through the multi-port transmission function of the tree optical splitter 10, the error detector 3 will automatically search for each product to be tested And find out its best test point.

Procedure 103: Measure bit error rate

When the program 102 is completed, that is, after the optimal test points of all the optical transmission modules 5 to be tested are completed, the bit error detector 3 can read all the test data at one time through the multi-channel data bus 9, including The optical splitting action of the splitter 10 measures the bit error rate of the received signal at the same time, and calculates the error probability of the bit sent by the receiver of each product under test.

Procedure 106: Test Completion

This program is to judge whether the bit error rate measured by the optical transmission module 5 to be tested has completed enough measurement points through the programs 101 and 103; if not, then go back to the program 101 to adjust the input optical power of the next test point; if so, Then execute program 105 .

Procedure 105: Calculating Results

This procedure is based on the procedure 106 to determine that the optical transmission module to be tested has completed the measurement of the bit error rate, and can obtain an input power and bit error rate based on the measured input power and bit error rate of the standard optical transmission module 4 and the optical transmission module to be tested 5 The sensitivity of each optical transmission module 5 to be tested is calculated for the corresponding measurement parameter points, as shown in FIG. 3 .

Please refer to FIG. 5B, and please refer to FIG. 4 and FIG. 5A together, which shows the test flow chart of the first embodiment of the fast optical transmission module testing method of the present invention, wherein the transmission test program of this embodiment includes programs 207, 208, 209 and 206 are the same as the programs 107, 108, 109, and 106 included in the transmission test program of the first embodiment of FIG. 5A, and the receiving test program of the second embodiment further includes measuring each optical transmission module to be tested 5 receiver SD signal parameters, and add a digital meter measurement program.

The receiving test program of the second embodiment of the present invention includes as follows:

Procedure 201: Adjusting the input optical power

First, the digital generator 2 will output a digital signal to the transmitter of the standard optical transmission module sample 4, and then the signal will be transmitted to an optical attenuator 6 through the transmitter, and the optical attenuator 6 will be adjusted each time according to the user's requirements. The energy of the optical signal is attenuated predictably, so that the input optical power is adjusted from large to small, and an optical power meter 8 measures the input optical power value of the optical transmission module 5 under test, and guides the optical power attenuated by the optical attenuator 6 The optical signal is sent to a tree optical splitter 10 , and the optical signal is sent to the receiver of each optical transmission module 5 to be tested through the multi-port transmission function of the tree optical splitter 10 to perform the procedure 210 .

Procedure 210: Digital Electric Meter Measurement

This program is to measure the SD _L voltage parameter of its SD signal by being connected to the digital ammeter 15 output by the receiving end of each optical transmission module 5 to be tested. Please refer to FIG. 6, which shows the measurement of the SD signal of the optical transmission module In the explanatory diagram, the potential value SD _L and the optical power value of the SD signal of each optical transmission module 5 to be tested are measured by the digital ammeter 15 and the optical power device 8 .

Procedure 206: Test Completion

This program is to judge whether the SD signal of each optical transmission module 5 to be tested has changed from H value to _L value; Adjust the input optical power until the SD signal of each optical transmission module 5 under test changes from H value to L value, and record its SD _L voltage and SD _D (SD _D is the abbreviation of Deasserted Signal Detect) optical power value.

Procedure 211: Adjust input optical power

The digital generator 2 will output a digital signal to the transmitter of the standard optical transmission module sample 4, and then transmit the signal to an optical attenuator 6 through the transmitter, and adjust the optical attenuator 6 each time according to the user's requirements The signal energy is attenuated predictably, so that the input optical power is adjusted from small to large, and an optical power meter 8 measures the input optical power of the optical transmission module 5 to be tested, and guides the optical signal attenuated by the optical attenuator 6 Send to a tree optical splitter 10, and transmit the optical signal to the receiver (Rx) of each optical transmission module 5 to be tested by the multi-port transmission function of the tree optical splitter 10, so as to perform the procedure 212.

Procedure 212: Digital electric meter measurement

This program uses the digital meter 15 to measure the potential change of the SD signal to measure the SD _H voltage parameter, and uses the optical power device 8 to measure the _SDA ( _SDA is the abbreviation of Asserted SignalDetect) optical power value when the SD signal changes. Please refer to FIG. 6, which is an explanatory diagram showing SD signal measurement of the optical transmission module.

Procedure 202: automatic search for test points

This procedure is that when the optical signal is transmitted to the receivers of the plurality of optical transmission modules 5 to be tested through the multi-port transmission function of the tree optical splitter 10, the error detector 3 will automatically search for each product to be tested And find out its best test point.

Procedure 203: Measure bit error rate

After the program 202 is completed, that is, after the optimal test points of all the optical transmission modules 5 to be tested are completed, the bit error detector 3 can read in all the test data at one time through the multi-channel data bus 9, which includes The optical splitting action of the splitter 10 measures the bit error rate of the received signal at the same time, and calculates the error probability of the bit sent by the receiver of each product under test.

Procedure 206: Test Completion

This program is to determine whether the SD _H voltage parameters measured by each optical transmission module 5 to be tested are all measured in the judgment program 212, and whether the measured voltage parameters of each optical transmission module 5 to be tested are measured in the judgment procedures 202 and 203. Whether the bit error rate has completed all the measurement conditions; if not, then go back to program 211 to continue adjusting the input optical power; After setting the required test point parameters for 5, the SD _H voltage parameters of each optical transmission module 5 to be tested will be continuously measured in the subsequent loop, and the procedures 202 and 203 will not be executed.

Procedure 205: Calculation Results

The bit error rate measurement of the optical transmission module to be tested is completed according to the loop of procedures 211, 212, 202 and procedure 203, and the input power and The bit error rate obtains a corresponding measurement parameter point, and calculates the sensitivity of the optical transmission module to be tested. As shown in Figure 6, the parameter measurement and sensitivity measurement of the SD signal can be completed at the same time.

In a preferred embodiment of the present invention, the product measurement implemented by the test system and method of the present invention can be executed by a software program to control multiple test instruments, taking the simultaneous measurement of eight products to be tested as an example. The total measurement time required by the test system of the present invention is 2.5 minutes, and the average measurement time for a product only needs to be 0.3 minutes, while the conventional technology can only do a single measurement, and the repeated single measurement is eight The measurement time for the product to be tested is 12 minutes, and the average measurement time for one product is 1.5 minutes. It can be seen from this that the fast optical transmission module testing system and method of the present invention can simultaneously implement the measurement of multiple products, which can save 79% of the measurement time compared with the conventional technology, and can increase the overall production capacity 4.8 times to improve product testing efficiency and productivity.

The rapid transmission optical transmission module testing system and method of the present invention will have many advantages and features. The present invention provides a test environment applied to optical transmission modules. The transmission-first module test system quickly and synchronously measures multiple products, thereby improving the production efficiency of the test system and method, which includes the present invention can use an optical channel selector (OCS) and a group of digital communication analyzers and spectra The analyzer is combined to switch multiple products to be tested for overall automatic detection, which can reduce the accumulated detection time of a single detection in the conventional technology.

Another advantage of the system and method of the present invention is to combine a tree optical splitter (TC), so as to transmit the measurement signal of the standard sample to the receiver of the product under test synchronously in a multi-port transmission mode to further measure its bit error rate to save time wasted conventionally in obtaining diagnostic reports for the product under test. In order to make the product analysis report obtained by the user meet the immediacy, and then effectively enhance the competitiveness of the industry.

Claims (13)

1. A fast optical transmission module testing system to test a plurality of optical transmission modules to be tested, comprising: A digital data analyzer has a digital generator and a bit error detector, and the bit error detector can measure the bit error rate of signals received by a plurality of optical transmission modules to be tested with multiple ports; A standard optical transmission module, used to transmit the digital signal output by the digital generator to be converted into an optical signal; an optical attenuator, used to attenuate the optical signal transmitted by the standard optical transmission module; A tree optical splitter, used to distribute the attenuated optical signal to the receivers of a plurality of optical transmission modules to be tested; and An optical channel selector switches one by one the plurality of optical transmission modules to be tested to receive the optical signal converted from the digital signal to measure the energy and waveform of the optical signal. 2. The fast optical transmission module testing system according to claim 1, wherein the optical transmission module comprises a receiver and a transmitter. 3. The fast optical transmission module test system according to claim 1, characterized in that: said digital data analyzer has a multi-channel data bus that can send said digital signal to a plurality of optical transmission modules to be tested Transmitter, and multi-port measurement of bit error rate of signals received by a plurality of optical transmission modules to be tested. 4. The fast optical transmission module testing system according to claim 1, characterized in that: the optical channel selector switches the optical signals sent by the plurality of optical transmission modules to be tested one by one to a digital communication analysis instrument and a spectrum analyzer to seek the parameter test of each optical transmission module to be tested. 5 . The fast optical transmission module testing system according to claim 4 , wherein the digital communication analyzer and the spectrum analyzer are arranged at the signal output end of the optical channel selector. 6. The fast optical transmission module testing system according to claim 1, characterized in that: said tree optical splitter, its input end and output end are respectively connected to the signal output end and the signal output end of said optical attenuator Receivers of a plurality of optical transmission modules to be tested. 7. A fast optical transmission module testing system to test a plurality of optical transmission modules to be tested, comprising: A tree optical splitter, used to distribute a standard optical signal to the receivers of a plurality of optical transmission modules to be tested; An optical channel selector, which switches the optical signals converted by the plurality of optical transmission modules to be tested one by one, so as to measure the energy and waveform of the optical signals; and A digital data analyzer has a digital generator and a bit error detector, the standard optical signal includes the digital signal output by the digital generator, and the bit error detector can measure multiple The bit error rate of the signal received by the optical transmission module to be tested. 8. The fast optical transmission module testing system according to claim 7, characterized in that: said digital data analyzer has a multi-channel data bus that can send said digital signal to a plurality of optical transmission modules to be tested Transmitter, and multi-port measurement of bit error rate of signals received by multiple transmission modules to be tested. 9. The fast optical transmission module testing system according to claim 1, characterized in that: the optical channel selector switches the optical signals sent by the plurality of optical transmission modules to be tested one by one to a digital communication analysis instrument and a spectrum analyzer to seek the parameter test of each optical transmission module to be tested. 10. A fast optical transmission module testing method for testing a plurality of optical transmission modules, the method at least includes the following steps: Using an optical channel selector to switch the optical signals converted by a plurality of optical transmission modules one by one to measure the energy and waveform of the optical signals; and Using a tree optical splitter, a standard optical signal is distributed to the receivers of a plurality of optical transmission modules to be tested, and an error detector is used to measure the received signals of a plurality of optical transmission modules to be tested. bit error rate. 11. The fast optical transmission module testing method according to claim 10, wherein the step of utilizing the optical channel selector comprises: the optical channel selector switches the optical signals to a digital communication analyzer and A spectrum analyzer seeks the test value of each optical transmission module to be tested. 12. The fast optical transmission module testing method according to claim 10, characterized in that: the step of using the tree optical splitter comprises: a digital signal output by a digital generator passes through a standard optical transmission module , to convert to this standard optical signal. 13. A fast optical transmission module testing method for testing a plurality of optical transmission modules, the method at least includes the following steps: In a transmission test, using an optical channel selector to switch optical signals converted by a plurality of optical transmission modules one by one to measure the energy and waveform of the optical signals; and In a receiving test, a standard optical signal is distributed to the receivers of a plurality of optical transmission modules to be tested by using a tree optical splitter, and a plurality of ports to be tested are measured by a bit error detector The bit error rate of the signal received by the optical transmission module.

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