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Proceedings Paper

Multiplexed Sensing Systems Utilising All Fibre Ring Resonators
Author(s): F. Farahi; N. Takahashi; J.D. C. Jones; D. A. Jackson
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Paper Abstract

We describe a number of multiplexing techniques which may be used for fibre optic sensors in which the sensing element is a ring resonator. The basic optical unit comprises a sensing ring resonator connected to a second interrogating ring resonator of nearly equal length, and illuminated by a source of short coherence length. Using such an arrangement, the high finesse of the ring resonator may be exploited to yield a sensor of increased sensitivity over that obtainable with a two-beam interferometer. A number of such units may be combined to form an array, using coherence multiplexing techniques. When a high coherence source is used, then multiplexing may be accomplished using frequency division techniques. However, in this case, the resonators must have low finesse, in order to avoid cross-talk. We also show that when a source of moderate coherence length is used, it is possible to use both frequency division and coherence multiplexing simultaneously, with the potential of realising a large sensor array.

Paper Details

Date Published: 23 February 1989
PDF: 8 pages
Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); doi: 10.1117/12.949288
Show Author Affiliations
F. Farahi, The University of Kent (United Kingdom)
N. Takahashi, Himeji Institute of Technology (Japan)
J.D. C. Jones, The University of Kent (United Kingdom)
D. A. Jackson, The University of Kent (United Kingdom)

Published in SPIE Proceedings Vol. 1011:
Fiber Optic Sensors III
Ralf Th. Kersten, Editor(s)

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