Pico-strain multiplexed fiber optic sensor array operating down to infra-sonic frequencies | Zendy

Ian C. M. Littler | Zendy; Malcolm B. Gray | Zendy; J. H. Chow | Zendy; D. A. Shaddock | Zendy; D. E. McClelland | Zendy

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Pico-strain multiplexed fiber optic sensor array operating down to infra-sonic frequencies

Author(s) -

Ian C. M. Littler,

Malcolm B. Gray,

J. H. Chow,

D. A. Shaddock,

D. E. McClelland

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.011077

Subject(s) - optics , multiplexing , materials science , hydrophone , fiber optic sensor , laser , optical fiber , sensitivity (control systems) , frequency division multiplexing , accelerometer , wavelength division multiplexing , wavelength , acoustics , physics , telecommunications , electronic engineering , computer science , channel (broadcasting) , quantum mechanics , orthogonal frequency division multiplexing , engineering

An integrated sensor system is presented which displays passive long range operation to 100 km at pico-strain (pepsilon) sensitivity to low frequencies (4 Hz) in wavelength division multiplexed operation with negligible cross-talk (better than -75 dB). This has been achieved by pre-stabilizing and multiplexing all interrogation lasers for the sensor array to a single optical frequency reference. This single frequency reference allows each laser to be locked to an arbitrary wavelength and independently tuned, while maintaining suppression of laser frequency noise. With appropriate packaging, such a multiplexed strain sensing system can form the core of a low frequency accelerometer or hydrophone array.

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