Ultra‐compact liquid crystal dual core photonic crystal fibre multiplexer–demultiplexer

Abstract

In this study, the authors propose a novel design of ultra‐compact multiplexer–demultiplexer (MUX–DEMUX) based on silica photonic crystal fibre coupler. The suggested design has two large holes infiltrated with nematic liquid crystal of type E7. The reported MUX–DEMUX has short device length of 436 µm with low crosstalk better than −20 dB with bandwidths of 35 and 10 nm around operating wavelength of 1.3 and 1.55 μm, respectively. The simulation results are obtained using full‐vectorial finite‐difference method together with full‐vectorial beam propagation method.