A NOVEL FABRICATION METHOD FOR ALL-FIBER, WEAKLY FUSED, POLARIZATION BEAMSPLITTERS

A simple method for fabricating single-mode fused couplers For polariz ation beamsplitting is presented, The coupler is extremely weakly fuse d such that the first polarization modulation waist in its power trans fer characteristic is clearly extended, Due to such a feature, the cou pler drawing process may accurately he stopped at the waist point by s imply monitoring the power variations of tire output ports, We have ac hieved an average extinction ratio of -23.7 dB at the throughput port and -23.8 dB at the coupled port at the designated wavelength, The pol arization bandwidth obtained is 38 nm.