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Numerous tests are done by vendors during the designing and production phase of fiber patch cables to ensure the shipping of high-quality patch cables only. These optical fiber tests are crucial for every type of optical fiber network. It is necessary for the vendor as well as for end-users to learn and understand the tests which are done to determine the quality of the fiber patch cable and the result of these tests is evaluated to decide whether the fiber patch cables under consideration are suitable for your application or not. In this post we are going to talk about the three most important tests; insertion loss (IL) test, 3D metrology test, end-face clarity, and return loss (RL) test.