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Measurement of Bragg-Wavelength Distribution in a Long-Length Fiber Bragg Grating Based on Synthesis

Speaker: Koji Kajiwara,
Univ. of Tokyo JapanAbstract: We proposed a scheme for measuring Bragg-wavelength distribution inside a long-length fiber Bragg grating (FBG) using synthesis of optical coherence function. Synthesis of optical coherence function is one of the reflectometry techniques based on an interferometer. By modulating the oscillating frequency of the light source in a sinusoidal waveform, an optical coherence function with periodical delta-function like peaks is synthesized. This peak is swept through the measurement range, a long-length FBG, to know the Bragg wavelength distribution inside a long-length FBG. The center frequency of the light source is additionally swept in a saw-tooth waveform to measure the shape of the local reflection spectra inside the FBG. This technique is applicable to distributed strain and temperature sensor by obtaining the Bragg wavelength distributionHost: Alan Willner, willner@usc.edu, EEB 538, x04664

Location: Hughes Aircraft Electrical Engineering Center (EEB) - 539

Audiences: Everyone Is Invited

Contact: Gerrielyn Ramos