23 February 1989 Multiplexed Sensing Systems Utilising All Fibre Ring Resonators
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Proceedings Volume 1011, Fiber Optic Sensors III; (1989) https://doi.org/10.1117/12.949288
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany
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.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. Farahi, N. Takahashi, J.D. C. Jones, and D. A. Jackson "Multiplexed Sensing Systems Utilising All Fibre Ring Resonators", Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); doi: 10.1117/12.949288; https://doi.org/10.1117/12.949288

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