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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 17 — Aug. 20, 2007
  • pp: 10855–10862

Ultra-wide bandpass filter based on long-period fiber gratings and the evanescent field coupling between two fibers

Myoung Jin Kim, Yong Min Jung, Bok Hyeon Kim, Won-Taek Han, and Byeong Ha Lee  »View Author Affiliations

Optics Express, Vol. 15, Issue 17, pp. 10855-10862 (2007)

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We demonstrate a fiber-based bandpass filter with an ultra-wide spectral bandwidth. The ultra-wide band feature is achieved by inscribing a long-period fiber grating (LPG) in a specially-designed low index core single mode fiber. To get the bandpass function, the evanescent field coupling between two attached fibers is utilized. By applying strain, the spectral shape of the pass-band is adjusted to flat-top and Gaussian shapes. For the flat-top case, the bandwidth is obtained ~160 nm with an insertion loss of ~2 dB. With strain, the spectral shape is switched into a Gaussian one, which has ~120 nm FWHM and ~4.18 dB insertion loss at the peak.

© 2007 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.2340) Fiber optics and optical communications : Fiber optics components

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 16, 2007
Revised Manuscript: July 30, 2007
Manuscript Accepted: August 2, 2007
Published: August 14, 2007

Myoung Jin Kim, Yong Min Jung, Bok Hyeon Kim, Won-Taek Han, and Byeong Ha Lee, "Ultra-wide bandpass filter based on long-period fiber gratings and the evanescent field coupling between two fibers," Opt. Express 15, 10855-10862 (2007)

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