How to test the light module?

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Footer test

When testing, you need to pay attention to the wavelength and shape of the waveform output waveform, as well as the jitter 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 of the transmitter must be good enough. In addition, the quality of electrical measurement must be confirmed through jitter measurement and eye map measurement. Eye map measurement is a common method for checking the output waveform of the transmitter, because the eye map contains rich information, which can reflect the overall performance of the transmitter.

2. The output light signal of the transmitter must be measured with optical quality indicators such as eye map testing, light adjustment amplitude and anti -light ratio.

Receiver test

When testing the receiver, you need to pay attention to the following two points:

3. Different from the test launcher, the quality of the light signal must be poor enough when testing the receiver.

4. Finally, you need to test the electronic output signal of the receiver. There are three main types of tests: this test:

※ Eye map test, this can ensure that the "eye" of the eye map is open. Eye map tests are usually implemented by the depth of the error rate

※ Umbnation test, test different types of jitter jitter

※ Tracking and tolerance, testing the trace of the internal clock recovery circuit