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Optical Engineering

Optimization technique for simple reconstruction of the index modulation profile of symmetric fiber Bragg gratings from their reflective spectrum
Author(s): Ruitao Zheng; Nam Quoc Ngo; L. N. Binh; Swee Chuan Tjin; Ping Shum
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Paper Abstract

We propose a new and simple method to reconstruct the refractive-index modulation of a symmetric fiber Bragg grating (FBG) from its magnitude reflection spectrum (i.e., phase information is not required). The reconstruction method uses an FBG model based on some known parameters of the fabricated FBG (grating length, number of subgratings, and grating period) and an optimization technique, namely, the Quasi-Newton method, to find the local parameter values of the FBG. To our knowledge, this is the first time that the reconstruction of FBG is experimentally realized by an optimization technique. Compared with other reconstruction methods, the proposed method is so simple that it requires only the reflection spectrum of the fabricated FBG.

Paper Details

Date Published: 1 January 2006
PDF: 4 pages
Opt. Eng. 45(1) 014403 doi: 10.1117/1.2159408
Published in: Optical Engineering Volume 45, Issue 1
Show Author Affiliations
Ruitao Zheng, Nanyang Technological Univ. (Singapore)
Nam Quoc Ngo, Nanyang Technological Univ. (Singapore)
L. N. Binh, Nanyang Technological Univ. (Singapore)
Swee Chuan Tjin, Nanyang Technological Univ. (Singapore)
Ping Shum, Nanyang Technological Univ. (Singapore)

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