Serially multiplexed point sensor for the detection of high humidity in passive optical networks

David C. Bownass, James S. Barton, J. D C Jones

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We describe a fiber-optic sensor capable of detecting high humidity. The device is constructed from standard telecommunications single-mode fiber and is compatible with deployment in a serial array, permitting interrogation by optical time-domain reflectometry for network monitoring. The sensors exhibit a reversible change in insertion loss between their dry (lossy) and humid (transmissive) states. The loss can be tailored to take any value; the current devices were designed to change by ˜2.5 dB at a wavelength of 1.31 µm. The sensors are simple to construct and are compatible with installation in an existing passive optical network. The transduction mechanism is based on the humidity-induced change in refractive index in a polymer overlay on a polished half-block single-mode fiber device. © 1997 Optical Society of America.

Original languageEnglish
Pages (from-to)346-348
Number of pages3
JournalOptics Letters
Volume22
Issue number5
Publication statusPublished - 1 Mar 1997

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