HIGH-ISOLATION DEMULTIPLEXING IN BEND-TUNED TWIN-CORE FIBER

By applying a cantilever bend to a twin-core optical fiber wavelength division demultiplexer, isolations of >30 dB have been achieved betwee n channels at 1.33-1.54 mu m, These bend-tuned TCF's exhibit greater t han or equal to 20 dB isolation over a bandwidth of 32 and 21 nm in th e two wavelength windows, respectively, This is significantly better t han that typically offered by commercially available, single-stage, ta pered coupler demultiplexers, The bend-tuning mechanism is demonstrate d experimentally and described theoretically using a coupled local-mod e analysis.