VARIABLE RATIO COUPLER / TUNABLE DIRECTIONAL COUPLER (PMF)

Fiber tunable directional coupler (FTDC) has an all-fiber construction and provides the tuning range of 0 – 100 % coupling ratio with negligible optical loss. It is based on evanescent field coupling using two side polished fibers where the coupling ratio is tuned by adjusting the core-to-core geometric offset. Customer specified fibers and operating wavelengths are available including single-mode fibers, polarization maintaining fibers and other specialty fibers.