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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 19 — Sep. 12, 2011
  • pp: 18614–18620

Novel ultra-short and ultra-broadband polarization beam splitter based on a bent directional coupler

Daoxin Dai and John E Bowers  »View Author Affiliations


Optics Express, Vol. 19, Issue 19, pp. 18614-18620 (2011)
http://dx.doi.org/10.1364/OE.19.018614


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Abstract

A novel ultra-short polarization beam splitter (PBS) based on a bent directional coupler is proposed by utilizing the evanescent coupling between two bent optical waveguides with different core widths. For the bent directional coupler, there is a significant phase-mismatch for TE polarization while the phase-matching condition is satisfied for TM polarization. Therefore, the TM polarized light can be coupled from the narrow input waveguide to the adjacent wide waveguide while the TE polarization goes through the coupling region without significant coupling. An ultra-short (<10μm-long) PBS is designed based on silicon-on-insulator nanowires and the length of the bent coupling region is as small as 4.5μm while the gap width is chosen as 200nm (large enough to simplify the fabrication). Numerical simulations show that the present PBS has a good fabrication tolerance for the variation of the waveguide width (more than ± 60nm) and a very broad band (~200nm) for an extinction ratio of >10dB.

© 2011 OSA

OCIS Codes
(130.0130) Integrated optics : Integrated optics
(230.5440) Optical devices : Polarization-selective devices

ToC Category:
Integrated Optics

History
Original Manuscript: July 5, 2011
Revised Manuscript: July 21, 2011
Manuscript Accepted: July 25, 2011
Published: September 8, 2011

Citation
Daoxin Dai and John E Bowers, "Novel ultra-short and ultra-broadband polarization beam splitter based on a bent directional coupler," Opt. Express 19, 18614-18620 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-19-18614


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