To ensure its quality and performance, each optical transceiver module must go through rigorous testing and quality inspection before shipment. Procedures include incoming quality control, parameter testing, aging test, etc. All test results must be up to standard, otherwise, the optical module will be returned to the production line for adjustment. In this article we will introduce the testing and inspection procedures that an optical transceiver module will undergo, and how the testing results will affect the quality and performance. 1. Incoming Quality Control and Surface Mounted Component Inspection Incoming quality control and surface mounted component Inspection are performed prior to assembly. Among them, Incoming quality control means that the manufacturer inspects the quality of incoming components before assembling optical modules, such as detect the Transmitter Optical Sub-assembly (TOSA), Receiver Optical Sub-assembly (ROSA), and Bi-Directional Optical Sub-assembly (BOSA) to ensure the quality of optical modules, reduce the rework rate and defect rate as well as avoid damage to expensive optical equipment. Surface mounted component Inspection mainly checks whether the Printed Circuit Board (PCB) is correct and whether it is contaminated. This ensures the performance of the optical transceiver module. https://www.glsunmall.com/fiber-optic-articles/how-to-test-the-quality-of-optical-transceivers.html