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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 1 — Jan. 1, 2013
  • pp: 1–3

FSR-free add–drop filter based on silicon grating-assisted contradirectional couplers

Huiye Qiu, Guomin Jiang, Ting Hu, Haifeng Shao, Ping Yu, Jianyi Yang, and Xiaoqing Jiang  »View Author Affiliations

Optics Letters, Vol. 38, Issue 1, pp. 1-3 (2013)

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We propose an add–drop filter with an unlimited free spectral range (FSR). The device is based on grating-assisted contradirectional couplers with silicon-on-insulator ridge waveguides. The intrawaveguide coupling is significantly diminished by distancing the periodically structured corrugated waveguide away from the straight input waveguide. Based on this asymmetric structure, calculated results show that the peak reflectivity of the intrawaveguide coupling is lower than 0.1 dB, while that of the contradirectional coupling is higher than 20 dB. An experimental result of 1.8 dB for the intrawaveguide coupling is obtained. A narrow drop-port bandwidth of 0.8 nm is also achieved experimentally.

© 2012 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Integrated Optics

Original Manuscript: October 29, 2012
Manuscript Accepted: November 22, 2012
Published: December 19, 2012

Huiye Qiu, Guomin Jiang, Ting Hu, Haifeng Shao, Ping Yu, Jianyi Yang, and Xiaoqing Jiang, "FSR-free add–drop filter based on silicon grating-assisted contradirectional couplers," Opt. Lett. 38, 1-3 (2013)

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