System and method for measuring perturbations utilizing an optical filter and a narrowband optical source

摘要

An optical device, a method of configuring an optical device, and a method of using a fiber Bragg grating is provided. The optical device includes a fiber Bragg grating, a narrowband optical source, and at least one optical detector. The fiber Bragg grating has a power transmission spectrum as a function of wavelength with one or more resonance peaks, each comprising a local maximum and two non-zero-slope regions with the local maximum therebetween. The light generated by the narrowband optical source has a wavelength at a non-zero-slope region of a resonance peak that is selected such that one or more of the following quantities, evaluated at the resonance peak, is at a maximum value: (a) the product of the group delay spectrum and the power transmission spectrum and (b) the product of the group delay spectrum and one minus the power reflection spectrum.

主权项

1. An optical device comprising:
an optical filter having a power transmission spectrum as a function of wavelength and a group delay spectrum as a function of wavelength, the power transmission spectrum comprising a plurality of peaks each comprising a local maximum and two non-zero-slope regions with the local maximum therebetween, the optical filter having a wavelength-dependent figure of merit proportional to a product of the group delay spectrum and the power transmission spectrum; and a narrowband optical source in optical communication with the optical filter such that a transmitted portion of light from the narrowband optical source is transmitted through the optical filter, the light from the narrowband optical source having a wavelength at a non-zero-slope region of a peak of the plurality of peaks at which the figure of merit evaluated at the local maximum of the peak is greater than the figures of merit evaluated at the local maxima of the other peaks of the plurality of peaks.