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Whispering gallery modes (WGMs) excitation in a cylindrical microresonator formed by a section of silica optical fiber has been studied. Evanescent light coupling into the microresonator is realized using a tapered optical fiber, fabricated by a microheater brushing technique. Several types of silica fibers with different diameters are studied as microresonators, and the influence of the resonator's...
In this paper, we propose a novel approach to measurements of low relative humidity (RH) levels based on the whispering gallery modes (WGMs) phenomenon in a silica microsphere resonator coated with Agarose. The spectral dips of the WGM resonances excited in the proposed sensor depend strongly on the changes in the refractive index (RI) of the coating material as well as the surrounding RI. A study...
A novel cascade optical quantization scheme for the resolution enhancement of all-optical ADC is proposed. Using a phase modulator embedded Sagnac loop and the array of splitters with specific splitting ratios, the cascade optical quantization is realized with the maximum 1.59-bit enhancement of stated-number-of-bits. Simulation results show that a 20 GHz RF signal is precisely digitalized with the...
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