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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 6 — Mar. 15, 2010
  • pp: 6056–6063

Wavelength switchable flat-top all-fiber comb filter based on a double-loop Mach-Zehnder interferometer

Ai-Ping Luo, Zhi-Chao Luo, Wen-Cheng Xu, and Hu Cui  »View Author Affiliations

Optics Express, Vol. 18, Issue 6, pp. 6056-6063 (2010)

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A wavelength switchable all-fiber comb filter with flat-top spectral response based on a double-loop Mach-Zehnder (M-Z) interferometer is proposed and demonstrated. The proposed flat-top filter consists of a rotatable polarizer and a double-loop M-Z interferometer composed of two fiber couplers with a polarization controller (PC) in the first loop. In the theoretical analysis, when the second coupler of the M-Z interferometer is a non-3dB one, with proper settings of the polarization state of the input light and the PC, the wavelength switchable comb filter with flat-top passband can be obtained. Theoretical prediction was verified by experimental demonstration. The measured 1 dB bandwidth was 0.51 nm with a channel spacing of 0.98 nm, indicating that the flat-top passband of 1 dB bandwidth extends to about 50% of the comb spacing.

© 2010 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2340) Fiber optics and optical communications : Fiber optics components
(350.2460) Other areas of optics : Filters, interference

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: December 1, 2009
Revised Manuscript: February 10, 2010
Manuscript Accepted: March 4, 2010
Published: March 11, 2010

Ai-Ping Luo, Zhi-Chao Luo, Wen-Cheng Xu, and Hu Cui, "Wavelength switchable flat-top all-fiber comb filter based on a double-loop Mach-Zehnder interferometer," Opt. Express 18, 6056-6063 (2010)

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  1. Y. W. Lee, K. J. Han, B. Lee, and J. Jung, “Polarization-independent all-fiber multiwavelength-switchable filter based on a polarization-diversity loop configuration,” Opt. Express 11(25), 3359–3364 (2003). [CrossRef] [PubMed]
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  12. Y. W. Lee, H. T. Kim, J. Jung, and B. Lee, “Wavelength-switchable flat-top fiber comb filter based on a Solc type birefringence combination,” Opt. Express 13(3), 1039–1048 (2005). [CrossRef] [PubMed]

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