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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper CWC7

Wavelength monitoring in fiber-optic sensors using a tunable optical waveguide filter

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Abstract

In sensor systems that are based on optical fiber Bragg gratings the center wavelength of the grating reflection must be determined with a precision on the order of hundredths of a nm over an operating range of several nm. Systems have been reported using interference filters,1 long-pass transmission filters1 and Mach-Zehnder interferometers2 to provide the required wavelength discrimination. With these there is a trade-off to be made between the conflicting requirements of a large filtering slope (in %/nm) and a wide range of operating wavelengths.

© 1996 Optical Society of America

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