Open AccessCoherent few mode demultiplexer realized as a 2D grating coupler array in silicon
Author(s) -
T. Watanabe,
Bertold Ian Bitachon,
Yuriy Fedoryshyn,
Benedikt Baeuerle,
Ping Ma,
Juerg Leuthold
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.406251
Subject(s) - demultiplexer , optics , multiplexing , polarization division multiplexing , grating , materials science , silicon on insulator , wavelength division multiplexing , polarization (electrochemistry) , coupled mode theory , single mode optical fiber , insertion loss , optoelectronics , optical fiber , physics , multiplexer , silicon , electronic engineering , refractive index , engineering , wavelength , chemistry
We demonstrate an on-chip coherent mode scrambling demultiplexer for polarization multiplexed few mode signals. The device has been fabricated in the standard silicon-on-insulator platform. The mode demultiplexer consists of an array of 2D grating couplers for dual polarization few mode fiber-to-chip coupling and optical hybrids realized by 4×4 MMIs. The array of perfect vertical 2D grating couplers allows us an efficient fiber-to-chip coupling with experimental peak coupling efficiencies of -5.2 dB and -9.0 dB at 1570 nm for LP 01 and LP 11 modes, respectively, while simulated coupling efficiencies at 1550 nm are -3.6 dB and -3.3 dB for LP 01 and LP 11 , respectively. We successfully performed a back-to-back three LP modes division multiplexing transmission experiment with single polarization 32 Gbaud QPSK signals using the fabricated mode demultiplexer relying on offline MIMO DSP techniques.