Transmitter test
When testing, you need to pay attention to the wavelength and shape of the transmitter's output waveform, as well as the jitter tolerance and bandwidth of the receiver. When testing the transmitter, you need to pay attention to the following two points
1.The quality of the input signal used to test the transmitter must be good enough. In addition, the quality of the electrical measurement must be confirmed through jitter measurement and eye diagram measurement. Eye diagram measurement is a common method to check the output waveform of the transmitter, because the eye diagram contains a wealth of information that can reflect the overall performance of the transmitter.
2. The output optical signal of the transmitter must be measured with optical quality indicators such as eye diagram test, optical modulation amplitude and extinction ratio.
Receiver test
When testing the receiver, you also need to pay attention to the following two points
1.Different from the test transmitter, when testing the receiver, the quality of the optical signal must be poor enough. Therefore, a light pressure eye diagram representing the worst signal must be created. This worst optical signal must pass jitter Measure and optical power test for calibration.
2. Finally, the electronic output signal of the receiver needs to be tested. There are three main types of this test:
Eye diagram test: This can ensure that the "eyes" of the eye diagram are in an open state. Eye diagram testing is usually achieved by the depth of the bit error rate.
Jitter test: test different types of jitter
Jitter tracking and tolerance: test the jitter tracking of the internal clock recovery circuit
Testing an optical module is a complicated task, but it is also an indispensable step to ensure its good performance. As a widely used measurement method, eye diagram measurement can effectively test the transmitter of an optical module. The receiver test of the optical module is a little more complicated and requires more test methods.
You can view the video of the eye diagram test being performed by the HTF engineers.
Do you have any question? please contact melanie@htfuture.com
