A fiber optic coupler is an optical device used to distribute or combine light signals between two or more fibers. It can take light from a single input fiber and divide it among several output fibers, or merge light from multiple fibers into one output fiber. Couplers can also couple light from free space into a fiber, acting as a bridge for optical signals in fiber optic systems .
Fiber optic couplers operate through optical power transfer between closely aligned fibers or planar waveguides. The light is transferred via evanescent field coupling or mode interference, depending on the design. The distribution of light among outputs is determined by the coupling ratio, which can be equal (e.g., 50/50) or uneven (e.g., 70/30, 90/10). Passive couplers require no external power, while active couplers use detectors and light sources to manage signal transmission .
Fiber optic couplers are widely used in telecommunications, Passive Optical Networks (PON), CATV, signal monitoring, and redundancy systems. They enable multiplexing, bidirectional communication, and network signal management .
Key parameters include insertion loss, splitting ratio accuracy, polarization-dependent loss, and wavelength uniformity. These ensure reliable operation in compliance with standards such as ITU-T G.671 and Telcordia GR-1209/1221 . In summary, a fiber optic coupler is a fundamental component in optical networks, enabling efficient light distribution and combination for various communication and monitoring applications.
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