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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 9 — Apr. 23, 2012
  • pp: 10163–10169

Mode-evolution-based polarization rotator-splitter design via simple fabrication process

Wangqing Yuan, Keisuke Kojima, Bingnan Wang, Toshiaki Koike-Akino, Kieran Parsons, Satoshi Nishikawa, and Eiji Yagyu  »View Author Affiliations

Optics Express, Vol. 20, Issue 9, pp. 10163-10169 (2012)

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A mode-evolution-based polarization rotator-splitter built on InP substrate is proposed by combining a mode converter and an adiabatic asymmetric Y-coupler. The mode converter, consisting of a bi-level taper and a width taper, effectively converts the fundamental TM mode into the second order TE mode without changing the polarization of the fundamental TE mode. The following adiabatic asymmetric Y-coupler splits the fundamental and the second order TE modes and also converts the second order TE mode into the fundamental TE mode. A shallow etched structure is proposed for the width taper to enhance the polarization conversion efficiency. The device has a total length of 1350 µm, a polarization extinction ratio over 25 dB and an insertion loss below 0.5 dB both for TE and TM modes, over the wavelength range from 1528 to 1612 nm covering all C + L band. Because the device is designed based on mode evolution principle, it has a large fabrication tolerance. The insertion loss remains below 1 dB and the polarization extinction ratio remains over 17 dB with respect to a width variation of +/− 0.12 µm at the wavelength of 1570 nm, or +/− 0.08 µm over the entire C + L band.

© 2012 OSA

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(130.0130) Integrated optics : Integrated optics
(130.5440) Integrated optics : Polarization-selective devices

ToC Category:
Integrated Optics

Original Manuscript: February 3, 2012
Revised Manuscript: March 22, 2012
Manuscript Accepted: March 22, 2012
Published: April 18, 2012

Wangqing Yuan, Keisuke Kojima, Bingnan Wang, Toshiaki Koike-Akino, Kieran Parsons, Satoshi Nishikawa, and Eiji Yagyu, "Mode-evolution-based polarization rotator-splitter design via simple fabrication process," Opt. Express 20, 10163-10169 (2012)

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