The optical module is composed of a transmitter and a receiver. When the transmitter is connected to the receiver through the optical fiber, if the bit error rate of the whole system does not achieve the desired effect, is it the transmitter‘s problem or the receiver‘s problem? A finished optical module, in order to ensure the quality of the product, must go through a number of steps of testing before shipping. Testing the properties and interoperability of optical devices, especially optical modules, is critical. So how test the performance of the optical module?

Steps

1. Firstly, the optical power, receiving sensitivity, eye chart, and extinction ratio and error code are measured. The equipment needed is optical attenuator, optical power meter, error code meter (to adjust the optical power and sensitivity through the rate) and eye chart.

2. Conduct high and low temperature aging test to check the stability of the product.

3. Test the product compatibility in the switch to ensure the compatibility.

4. Finally, the end face was detected on the optical fiber end face detector. The port was cleaned with a cleaning pen to keep the port clean and ensure the quality.

Attention

When testing, it is necessary to pay attention to the wavelength and shape of the output waveform of the transmitter, as well as the chatter tolerance and bandwidth of the receiver. The quality of the input signal used to test the transmitter must be good enough. In addition, the quality of electrical measurements must be confirmed by dither and eye chart measurements. Eye map measurement is a common method to check the output waveform of emitter, because eye map contains rich information and can reflect the overall performance of emitter.

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