Abstract
A high sensitivity gas sensing technology based on fiber ring resonator slow-light is proposed and demonstrated in this paper. Slow-light produced by coupled resonator induced transparency in a fiber ring resonator has been studied theoretically and experimentally. Influences of parameters, such as cycle numbers, coupling ratio of couplers, ring loss and coupler additional loss, on slow-light characteristics of the fiber ring resonator were analyzed theoretically and numerically in detail. The delay time of slow-light in the fiber ring resonators has been measured using time domain measuring method, and the maximum delay time of 34.18ns at wavelength of 1531.63nm has been obtained, which is in accord with theoretical analysis. The gas absorption coefficient at the wavelength of 1531.63nm where slow-light generated reached 2.41, which increased by 6.73 times the figure for the traditional method. It is the first time to measure gas concentration by using slow-light in fiber ring resonators, and the method is simple in structure and easy to implement.
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