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Optical waveguide sensors based on cascaded double- ring resonators are analyzed theoretically and experimentally, for both wavelength interrogation and intensity interrogation methods. It is shown that for the wavelength interrogation, the sensitivity can be increased by over three orders of magnitude by combining the intensity ratio detection of two central peaks, compared with the simple digital...
An optical sensor based on two cascaded microring resonators is fabricated in silicon-on-insulator waveguide. A Q-factor of 2×104 is measured and the increase of refractive index sensitivity by using Vernier effect is investigated experimentally.
A highly-sensitive optical sensor comprising of two cascaded microring resonators with Vernier effect is investigated theoretically. It is shown that a refractive index change in the order of 10−7 RIU can be measured from the relative intensities of two adjacent modes.
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