Since the optical modules used on the devices at both ends must emit the same wavelength to establish communication, the manufacturer must test the wavelength of the optical module before shipment to ensure that it is within the deviation range.
Generally, manufacturers use optical spectrum analyzers and other instruments to measure the central wavelength of optical modules, and the measured central wavelength of optical modules usually deviate from the standard value. Different types of optical modules have different deviations, but as long as the deviation is within the allowable range。
For example, the central wavelength of the SFP-10G-LR optical module is 1310nm, and its deviation is ±50nm, and the central wavelength of the SFP-10G-SR optical module is 850nm, and its deviation is ±10nm. The center wavelength of the DWDM-SFP10G-40 optical module is 1560.61 nm, and its deviation is ±0.8 nm. If the tested value is inconsistent with the standard specification, the optical module is regarded as defective.
In addition, the optical module needs to be subjected to extremely low temperature test, high and low temperature cycle test, and constant damp heat test. As long as the optical module can work normally, its components are free from dislocation and damage, and the housing package is not broken; and the indicators of the optical interface meet the technical requirements. It means that the optical module has passed the test.
Other important tests of optical transceiver
At the same time, in order to ensure the stability of the optical module, high temperature aging test, real machine test and interface test are also required.
