Fiber-optic coupling is the practice of either combining or splitting optical signals between three or more fiber-optic cables. Most fiber-optic couplers are relatively small devices, though they can vary considerably in complexity, depending on how many inputs and outputs there are. It is possible for a fiber optic coupler to split or combine signals by converting the optical signals into electrical ones or by maintaining the signals in their optical form. Coupling lens is the g lens used in the fiber coupler.
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