Time-addressing of coherence-tuned optical fibre sensors based on a multimode laser diode

Jose Luis Santos; David A. Jackson

doi:10.1117/12.50026

1 August 1991 Time-addressing of coherence-tuned optical fibre sensors based on a multimode laser diode

Jose Luis Santos, David A. Jackson

Proceedings Volume 1572, International Conference on Optical Fibre Sensors in China OFS(C) '91; (1991) https://doi.org/10.1117/12.50026
Event: International Conference on Optical Fibre Sensors in China, 1991, Wuhan, China

Abstract

A scheme is described in which a multimode laser diode, with effective coherence length less than 250 micrometers , is used to illuminate sensors multiplexed in time and with their status read by coherence sensing. Data is presented which shows that the spectral characteristics of the laser light remain essentially unchanged upon direct modulation of the laser injection current or while subject to laser feedback. This has allowed the multiplexing scheme network to be implemented without recourse to either a Bragg cell modulator or an optical isolator. The technique was applied to measure displacement and temperature.

Citation Download Citation

Jose Luis Santos and David A. Jackson "Time-addressing of coherence-tuned optical fibre sensors based on a multimode laser diode", Proc. SPIE 1572, International Conference on Optical Fibre Sensors in China OFS(C) '91, (1 August 1991); https://doi.org/10.1117/12.50026

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