Polarisation splitter/combiner based on an antiresonant directional coupler

摘要

The theoretical performance of a new polarisation splitter/combiner based on a directional coupler is studied using vectorial mode analysis. The device includes an efficient antiresonant mirror transparent to TM polarisation and opaque to TE polarisation. Simulations indicate a high level of TM light can be transferred from the input waveguide into the non-excited guide for coupling lengths shorter than 1 mm. In addition, coupling efficiency of 80% and extinction ratios close to 30 dB have been obtained in a not optimised device.