Frequency-Shifted Multiwavelength Fiber Bragg Grating Laser Sensor

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Published 9 December 2004 • Copyright (c) 2004 The Japan Society of Applied Physics
, , Citation Shinji Yamashita et al 2004 Jpn. J. Appl. Phys. 43 8322 DOI 10.1143/JJAP.43.8322

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1 Department of Electronic Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

2 CREST, Japan Science and Technology, Kawaguchi Center Building 12F, 4-1-8 Hon-cho, Kawaguchi-shi, Saitama 332-0012, Japan

3 NEC Corporation, System Platforms Research Laboratories, 1753 Shimonumabe Nakahara-ku Kawasaki, Kanagawa 211-8666, Japan

Dates

  1. Received 4 June 2004
  2. Accepted 2 September 2004
  3. Published

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1347-4065/43/12R/8322

Abstract

We propose and demonstrate a novel active multiwavelength fiber Bragg grating (FBG) laser sensor system. Simultaneous multiwavelength oscillation by the frequency-shifted feedback technique markedly enhances output power and signal-to-noise ratio (SNR) compared with a conventional passive FBG sensor system. The principle of the simultaneous measurement of the dynamic strain signal from wavelength multiplexed FBGs is experimentally confirmed by employing an arrayed waveguide grating (AWG) as a wavelength demodulator.

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10.1143/JJAP.43.8322