Improved 8-channel silicon mode demultiplexer with grating polarizers

• DOI: 10.1364/oe.22.012799
• Publication Date: 2014-05-19T21:35:45Z
• Authors: Jian Wang; Pengxin Chen; Sitao Chen; Yaocheng Shi; Daoxin Dai
• Keywords: Demultiplexer; Polarizer; Extinction ratio; Channel spacing; Optical add-drop multiplexer

An improved 8-channel silicon mode demultiplexer is realized with TE-type and TM-type grating polarizers at the output ends, these gratings serve as fiber-chip couplers simultaneously. The present includes a three-waveguide PBS (for separating TE0 TM0 modes) six cascaded ADCs demultiplexing high-order modes of both polarizations). high extinction ratios are used to filter out polarization crosstalk in hybrid multiplexer efficiently measured for all mode-channels reduced greatly ~-20dB ~100nm bandwidth.