Open AccessWideband silicon photonic polarization beamsplitter based on point-symmetric cascaded broadband couplers
Author(s) -
Lu Zheng,
Yun Wang,
Fan Zhang,
Nicolas A. F. Jaeger,
Lukas Chrostowski
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.029413
Subject(s) - wideband , optics , broadband , silicon on insulator , beam splitter , polarization (electrochemistry) , power dividers and directional couplers , physics , photonics , bandwidth (computing) , coupling loss , transverse plane , optical isolator , silicon photonics , silicon , optoelectronics , materials science , telecommunications , optical fiber , laser , chemistry , structural engineering , computer science , engineering
We design and demonstrate a wideband silicon photonic polarization beamsplitter on a silicon-on-insulator platform. The device consists of two 3 dB broadband couplers cascaded in a point-symmetric network. The transverse electric (TE) and transverse magnetic (TM) modes are coupled to different output ports due to a large difference between their coupling strengths. The device exhibits large isolation at both the two output ports, of more than 20 dB over a large bandwidth of 125 nm, and a small excess loss, of less than 0.5 dB for the entire C-band.