Abstract
Fiber Bragg grating (FBG) devices have received wide attention because they are useful in a variety of passive and active WDM network components and for sensing various measurands. These applications take advantage of either the broad- or narrow-band spectral characteristics of the Bragg resonance and its sensitivity to extrinsic perturbations. In this paper, we examine FBG tuning by controlling the effective index of the optical waveguide through modification of the cladding. This causes a change in the evanescent field which is reflected in a proportional shift in the Bragg wavelength. If the change is large enough then it can be detected by measuring the shift in the resonance line or equivalently by determing phase-path imbalances in an auxiliary interferometer. Very small wavelength changes are more easily measured by forming a compound FBG transmission filter, such as a three-grating Fabry-Perot interferometer, and using a tuneable laser to determine the transmission or reflection spectrum.
© 1995 Optical Society of America
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