A fiber optic coupler is an optical device that connects three or more fiber ends, allowing a single input signal to be divided into multiple outputs or multiple inputs to be combined into one output ( ). Unlike active devices, couplers generally do not require electrical power and operate passively, making them reliable and energy-efficient components in optical networks ( ).
The most common type, the Fused Biconical Taper (FBT) coupler, works by twisting, heating, and stretching two or more optical fibers so that their cores fuse together. In the coupling region, light from one fiber can transfer into adjacent fibers. The splitting ratio—how much light goes to each output—is controlled by the length of the fused region and the wavelength of the light ( ). Other fabrication methods include planar lightwave circuits and side-polished fibers, which provide precise control over light distribution ( ).
When designing a network, engineers must consider the number of ports, splitting ratio, insertion loss, and polarization effects to select the appropriate coupler. Passive couplers are ideal for simple signal distribution, while active couplers can amplify or regenerate signals when needed ( ). In summary, fiber optic couplers are essential components in modern optical communication, enabling flexible, efficient, and reliable management of light signals across complex networks.
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