CN201369728Y - Optical module receiving end performance testing device - Google Patents

Abstract

The utility model provides an optical module receiving end performance testing device which comprises a code pattern generating and error code testing instrument, an optical attenuator, a spectrometer, a test board and a control PC. The optical module receiving end performance testing device adopts an automatic mode, effectively improves the detecting efficiency, and simultaneously reduces the uncertainty brought by manual detection, and improves the detecting precision.

Description

An optical module receiving end performance testing device

technical field

The utility model relates to the testing field, in particular to a performance testing device for an optical module receiving end.

Background technique

At present, in the performance detection of the receiving end of the optical module, the method of manually adjusting the optical attenuator to change the power is adopted. The average receiving end performance detection time of a module is 1 minute, and the manual adjustment method will cause large fluctuations in results due to differences in human perception. That is, the test error is large, and the maximum error can reach 0.8dB.

Utility model content

The problem to be solved by the utility model is to overcome the problem of large errors caused by manual adjustment. The utility model provides a performance testing device for the receiving end of an optical module. The device includes a code pattern generation and bit error tester, an optical attenuator, a spectrometer, a test board and a control PC; wherein the code pattern generation and bit error tester is used for Generate a test pattern for network applications, and send the test signal to the optical attenuator through the output terminal. The test signal attenuated by the optical attenuator is divided into two paths by the 50:50 spectrometer, and one path is sent to the test board. The module under test on the other way is sent to the optical power meter; the optical attenuator, optical power meter, pattern generation and bit error tester and the test board are all connected to the control PC. The test software installed on the control PC processes the parameters collected by these instruments, and completes the receiver performance analysis and test data recording of the tested module.

The device adopts an automatic method, which effectively improves the detection efficiency; at the same time, it reduces the uncertainty caused by manual detection and improves the detection accuracy.

Description of drawings

The utility model will be explained by way of example and with reference to the accompanying drawings, wherein:

Fig. 1 is the testing device of the present invention.

Detailed ways

As shown in Figure 1, the optical module receiving end performance test device includes code generation and bit error tester, optical attenuator, spectrometer, test board and control PC.

The pattern generation and bit error tester is used to generate test patterns for network applications, and send the test signal to the optical attenuator through the output terminal. The attenuation value of the optical attenuator is programmable, and the test signal attenuated by the optical attenuator It is divided into two paths by the 50:50 spectrometer, one path is sent to the module under test placed on the test board, and the other path is sent to the optical power meter, which can be programmed to automatically read the power. Among them, the programmable optical attenuator, programmable optical power meter, pattern generation and bit error tester and test board are all connected to the control PC, for example, connected to the control PC with at least one interface among RS232, RS485, GPIB, and USB .

The pattern generation and bit error tester has the function of realizing pattern generation and bit error test at the same time. The pattern generation module and the bit error test module can come from different instruments or from the same instrument. The former case includes Agilent's 81133, 81200, Tektronix's DTG5000 and DTG2000 series, the latter case includes Agilent's N4903, Instelent's E5000 and E6000 series, etc.

Optical attenuator and optical power meter are optical domain testing instruments, in addition to the functions of ordinary optical attenuator and optical power meter, they also have the function of programmable control. Such as Agilent E4416/E4417/E4418/E4419, Tektronix's OA5022, Anritsu's ML9001, MA9625, 9626, 41's AV6334 and AV6381, etc.

The test board is used to process signals in the electrical domain, and its function is to input the high-speed test pattern as the modulation signal of the module under test; the high-speed radio frequency signal generated by the module under test is used as the input signal of the bit error test. Its main module is the RF signal amplifier part, especially the impedance matching design for high-speed signals. At the same time, the control part of the test board can automatically judge the amplitude of the output level of the module under test, and convert it into a digital signal and send it to the control PC through the serial interface. This signal is regarded as a test parameter for the performance test of the module under test .

The test pattern signal S1 generated by the pattern generation and bit error tester is sent to the optical attenuator through the output of the instrument, and the intensity is reduced to S2. After S2 reaches the 50:50 spectrometer, it is divided into two branches with equal power Signals SA and SB, SA are sent to the receiving end of the module under test placed on the test board, and SB is sent to the optical power meter to detect the power.

The SA signal is converted into the input signal SA' of the bit error test after being converted by the circuit of the module under test and the test board. After comparing the S1 and SA' signals bit by bit, the bit error analyzer calculates the bit error rate in real time.

SB and SA are the test signals after passing through the 50:50 spectrometer, and the power of the two is equal, so the SB power is the power received by the detection module.

The test software on the control PC reads the bit error rate and SB power value from the bit error meter and power meter in real time through the communication interface (such as RS232, RS485, GPIB, USB), and then performs curve fitting on the collected data, and then according to The sensitivity standard of the tested module (a specific bit error rate and received power value) judges whether the performance of the receiving end of the tested module meets the requirements, and records the test data of the tested module.

The device adopts an automatic method, which effectively improves the detection efficiency; at the same time, it reduces the uncertainty caused by manual detection and improves the detection accuracy.

All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

The utility model is not limited to the aforementioned specific embodiments. The utility model extends to any new feature or any new combination disclosed in this specification, as well as the steps of any new method or process or any new combination disclosed.

Claims (4)

1. An optical module receiving end performance test device, characterized in that: the device includes code pattern generation and a code error tester, an optical attenuator, a spectrometer, a test board and a control PC; code pattern generation and a code error test are connected to Optical attenuator, the test signal attenuated by the optical attenuator is divided into two paths by a 50:50 spectrometer, one path is connected to the module under test, and the other path is connected to the optical power meter; the optical attenuator, optical power meter, and pattern generator And the bit error tester and the test board are connected to the control PC. 2. The testing device as claimed in claim 1, characterized in that: said code pattern generation and bit error tester is an instrument with a serial interface. 3. The test device according to claim 1, wherein the optical attenuator is a programmable optical attenuator. 4. The test device according to claim 1, wherein the optical power meter is a programmable optical power meter.

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