A fiber optic coupler is a passive device that splits or combines optical signals in fibers. They are commonly described by the number of inputs and outputs, such as 1x2, 1x32, or 2x32, with 1:n or 2:n being most common in passive optical networks (PONs) and fiber-to-the-home (FTTH) systems. Couplers are bidirectional: they split signals in one direction and combine them in the other. Key specifications include excess loss and port-to-port variability, which indicate the efficiency and uniformity of signal distribution .
Testing a fiber optic coupler involves measuring insertion loss and verifying signal integrity. Standard methods include:
Several tools are used in the field or lab to test fiber optic couplers:
When testing couplers:
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