You use a fiber optic coupler for this job. It helps networks grow and change when needed. Of the more than a dozen types of fibre-optic connectors available, the four most commonly used today are LC, SC, FC, and ST. The following guide systematically describes. Fiber optic couplers are optical devices that connect three or more fiber ends, dividing one input between two or more outputs, or combining two or more inputs into one output. Fiber optic couplers can either be passive or. This article will give you an overview of the use cases for fiber-optic networking, some of the terms used in fiber networking, and suggestions for setting up a fiber network.