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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 12 — Jun. 7, 2010
  • pp: 12059–12064

Sidelobe suppression in all-fiber acousto-optic tunable filter using torsional acoustic wave

Kwang Jo Lee, In-Kag Hwang, Hyun Chul Park, and Byoung Yoon Kim  »View Author Affiliations

Optics Express, Vol. 18, Issue 12, pp. 12059-12064 (2010)

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We propose two techniques to suppress intrinsic sidelobe spectra in all-fiber acousto-optic tunable filter using torsional acoustic wave. The techniques are based on either double-pass filter configuration or axial tailoring of mode coupling strength along an acousto-optic interaction region in a highly birefringent optical fiber. The sidelobe peak in the filter spectrum is experimentally suppressed from −8.3dB to −16.4dB by employing double-pass configuration. Axial modulation of acousto-optic coupling strength is proposed using axial variation of the fiber diameter, and the simulation results show that the maximum side peak of −9.3dB can be reduced to −22.2dB. We also discuss the possibility of further spectral shaping of the filter based on the axial tailoring of acousto-optic coupling strength.

© 2010 OSA

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(230.1040) Optical devices : Acousto-optical devices

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 25, 2010
Revised Manuscript: May 10, 2010
Manuscript Accepted: May 10, 2010
Published: May 24, 2010

Kwang Jo Lee, In-Kag Hwang, Hyun Chul Park, and Byoung Yoon Kim, "Sidelobe suppression in all-fiber acousto-optic tunable filter using torsional acoustic wave," Opt. Express 18, 12059-12064 (2010)

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