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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 4137–4143

Design of a SiO2 top-cladding and compact polarization splitter-rotator based on a rib directional coupler

Jing Wang, Ben Niu, Zhen Sheng, Aimin Wu, Xi Wang, Shichang Zou, Minghao Qi, and Fuwan Gan  »View Author Affiliations

Optics Express, Vol. 22, Issue 4, pp. 4137-4143 (2014)

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A compact polarization splitter-rotator based on a silicon-on-insulator rib asymmetrical directional coupler with SiO2 top-cladding is proposed. Unlike previously reported PSRs which specifically required the top-cladding material to be different from the bottom cladding in order to break the symmetry of the waveguide cross-section, our proposed PSR has no such limitation on the top-cladding due to the horizontal asymmetry of the rib waveguide. In addition, the device is highly compact and has a total length as short as 24 μm. Numerical simulation shows that a high conversion efficiency of ~97% is obtained at the wavelength of 1550 nm. With the width variation of ± 15 nm and the gap variation of ± 50 nm, the PSR still has high ER of 12 dB at the cross-port, showing large fabrication tolerance. This device can be cascaded to improve the performance at the through port and an example of a two-stage PSR is presented. The mode conversion between the strip waveguide and the rib waveguide is also discussed.

© 2014 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides
(130.5440) Integrated optics : Polarization-selective devices

ToC Category:
Integrated Optics

Original Manuscript: December 16, 2013
Revised Manuscript: February 7, 2014
Manuscript Accepted: February 8, 2014
Published: February 14, 2014

Jing Wang, Ben Niu, Zhen Sheng, Aimin Wu, Xi Wang, Shichang Zou, Minghao Qi, and Fuwan Gan, "Design of a SiO2 top-cladding and compact polarization splitter-rotator based on a rib directional coupler," Opt. Express 22, 4137-4143 (2014)

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