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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 26 — Dec. 24, 2007
  • pp: 17747–17753

Wideband tunable wavelength-selective coupling in asymmetric side-polished fiber coupler with dispersive interlayer

Nan-Kuang Chen, Cheng-Ling Lee, and Sien Chi  »View Author Affiliations

Optics Express, Vol. 15, Issue 26, pp. 17747-17753 (2007)

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We demonstrate tunable highly wavelength-selective filter based on a 2×2 asymmetric side-polished fiber coupler with dispersive interlayer in one of the coupling arms. The asymmetric fiber coupler is made of two side-polished fibers using identical single-mode fibers and one of the polished fibers is further chemically etched at the central evanescent coupling region to gain closer to the core. An optical liquid with different dispersion characteristics than that of silica fiber is used to fill up the etched hollow and therefore the propagation constant for the polished fiber with dispersive liquid becomes more dispersive and crosses with that of another untreated polished fiber. The location of the cross point and the cross angle between two propagation constant curves determine the coupling wavelength and coupling bandwidth as well as channel wavelength separation, respectively. The coupling wavelength can be tuned at least wider than 84 nm (1.326–1.410 µm) under index variation of 0.004 and with coupling ratios of higher than 30 dB.

© 2007 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.2340) Fiber optics and optical communications : Fiber optics components
(160.6840) Materials : Thermo-optical materials
(260.2030) Physical optics : Dispersion

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 5, 2007
Revised Manuscript: December 7, 2007
Manuscript Accepted: December 10, 2007
Published: December 12, 2007

Nan-Kuang Chen, Cheng-Ling Lin, and Sien Chi, "Wideband tunable wavelength-selective coupling in asymmetric side-polished fiber coupler with dispersive interlayer," Opt. Express 15, 17747-17753 (2007)

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