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Largely tunable CFBG-based dispersion compensator with fixed center wavelength

Xinyong Dong, P. Shum, N. Q. Ngo, C. C. Chan, Jun Hong Ng, and Chunliu Zhao

Open Access Open Access

Abstract

A largely tunable chirped fiber Bragg grating (CFBG)-based dispersion compensator with fixed center wavelength is demonstrated. Tunable dispersion ranging from 178 to 2126 ps/nm, corresponding to a large range of 3-db bandwidth from 0.42 to 5.04 nm, is realized by using a 10 cm-long CFBG with an original bandwidth of 1.61 nm. The variation in center wavelength is less than 0.2 nm.

©2003 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Schematic diagram of the CFBG-based tunable dispersion compensator.

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Fig. 2.
Fig. 2. Comparison of curvature distribution and Bragg wavelength variation between methods presented in this paper (blue lines) and in Ref. 10 (red lines).

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Fig. 3.
Fig. 3. Reflection spectra of the tunable dispersion compensator measured under different adjustment.

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Fig. 4.
Fig. 4. Relationship between 3-dB reflection bandwidth and displacement at the free end of the cantilever beam, and the variation in center wavelength.

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Fig. 5.
Fig. 5. Measured time delay for various 3-dB bandwidths of 0.42, 2.05, and 5.04 nm.

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Equations (3)

Equations on this page are rendered with MathJax. Learn more.

κ ( x ) = M ( x ) E I ( x ) = 12 L F E h 3 b 0 = 2 f L 2
Δ λ B λ B = C 2 ( 1 − p e ) κ l sin ( 2 θ )
Δ λ c = Δ λ B max − Δ λ B min = A κ
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