Fabrication tolerant and broadband polarization splitter and rotator based on a taper-etched directional coupler

Download
  1. Get@NRC: Fabrication tolerant and broadband polarization splitter and rotator based on a taper-etched directional coupler (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1364/OE.22.017458
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleOptics Express
ISSN1094-4087
Volume22
Issue14
Pages1745817465; # of pages: 8
SubjectDirectional couplers; Optical waveguides; Polarization; Silicon oxides; Waveguides; Fabrication tolerances; Planar waveguide circuit; Polarization conversion; Polarization crosstalk; Polarization splitters; Silicon wire waveguides; Silicon-on-insulator platforms; Upper cladding layers
AbstractWe propose a fabrication tolerant polarization splitter and rotator (PSR) on the silicon-on-insulator platform based on the mode-coupling mechanism. The PSR consists of a silicon wire waveguide coupled to a taper-etched waveguide. Compared to previously reported PSRs based on directional couplers which are sensitive to fabrication variations, the partially etched taper structure can compensate for fabrication inaccuracies. In addition, the taper-etched geometry breaks both the horizontal and vertical symmetries of the waveguide, introducing an additional degree of design freedom to accommodate different upper cladding layers. The proposed PSR can be readily integrated in a planar waveguide circuit using e.g. SiO2 cladding, making it compatible with typical metal back-end-ofline processes. Our simulation results show that the PSR has a low TM-to-TE polarization conversion loss of -0.09 dB in the C-band (or a conversion efficiency of 98%). A low TE-to-TE through insertion loss (-0.07 dB) and a very low polarization crosstalk (-30 dB) over a wide wavelength range exceeding 160 nm with a large fabrication tolerance (>50 nm) are numerically demonstrated.
Publication date
PublisherThe Optical Society
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences
Peer reviewedYes
NPARC number21272852
Export citationExport as RIS
Report a correctionReport a correction
Record identifier91dc4dc6-630f-4c66-b6ff-240baf91119f
Record created2014-12-03
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)