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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 24, Iss. 8 — Apr. 15, 1999
  • pp: 522–524

Accurate monitoring of an interferometric fiber-optic sensor with a multimode semiconductor laser

J. X. Fang and H. F. Taylor  »View Author Affiliations


Optics Letters, Vol. 24, Issue 8, pp. 522-524 (1999)
http://dx.doi.org/10.1364/OL.24.000522


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Abstract

A technique for monitoring interferometric sensors by correlation of the optical signal from the sensor with the signal from a phase-modulated reference interferometer is described. The technique is applied to temperature measurement with a fiber Fabry–Perot sensing head. We extend the 7 °C unambiguous measurement range obtained with a 1.3-μm laser diode as the light source to 43 °C by adding a second laser diode emitting at 1.55μm . Experimentally, a rms phase-measurement error of ±0.28rad , corresponding to a temperature error of ±0.32°C , was achieved with a low-quality multimode Fabry–Perot laser. The phase error was improved to ±0.14rad , corresponding to a temperature error of ±0.16°C , by use of a distributed-feedback laser diode.

© 1999 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

Citation
J. X. Fang and H. F. Taylor, "Accurate monitoring of an interferometric fiber-optic sensor with a multimode semiconductor laser," Opt. Lett. 24, 522-524 (1999)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-24-8-522

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