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Proceedings Paper

Development of electrically tunable optical filters based on fiber Bragg gratings
Author(s): Nam Quoc Ngo; Seriampalayam R. Natarajan; Meng Guan Chua; Winson Boon Chew Sheo; Kantisara Pita; G. Chen; Chuan Swee Tjin; Ping Shum
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Paper Abstract

We demonstrate the development of tunable optical filters based on fiber bragg gratings (FBGs). A distributed on fiber resistive heater consisting of a thin metal film is deposited by means of an Electron Beam Evaporator onto the outer surface of an uniform FBG. The physics of heat flowand diffusion in these structures leads to resistive heating of the metal film that follow, to a remarkably good approximation, the local resistance of the coating. This generated heating induces changes in the fiber’s refraction index (thermo-optic effect), which together with the thermal expansion effect of fiber causes a shift in the Bragg wavelength thereby achieving the tunability. Experimental results show a dc tuning range of 4.284 nm (nickel as thin film) with a corresponding electrical power of 569 mW. A maximum efficiency of 8.133 nm/W (gold as thin film) was obtained for dc tuning.

Paper Details

Date Published: 28 August 2002
PDF: 7 pages
Proc. SPIE 4904, Optical Fiber and Planar Waveguide Technology II, (28 August 2002); doi: 10.1117/12.481250
Show Author Affiliations
Nam Quoc Ngo, Nanyang Technological Univ. (Singapore)
Seriampalayam R. Natarajan, Nanyang Technological Univ. (Singapore)
Meng Guan Chua, Nanyang Technological Univ. (Singapore)
Winson Boon Chew Sheo, Nanyang Technological Univ. (Singapore)
Kantisara Pita, Nanyang Technological Univ. (Singapore)
G. Chen, Nanyang Technological Univ. (Singapore)
Chuan Swee Tjin, Nanyang Technological Univ. (Singapore)
Ping Shum, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 4904:
Optical Fiber and Planar Waveguide Technology II
Shuisheng Jian; Steven Shen; Katsunari Okamoto, Editor(s)

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