Design and Modeling of a Fully Integrated Microring-Based Photonic Sensing System for Liquid Refractometry

Design and Modeling of a Fully Integrated Microring-Based Photonic Sensing System for Liquid Refractometry

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The design of a refractometric sensing system for liquids analysis with a sensor and the scheme for its intensity interrogation combined on a single photonic integrated circuit (PIC) is proposed.A racetrack microring resonator with a channel for the analyzed liquid formed on the top is used as a sensor, and another microring resonator with a lower Q-factor is utilized to detect the change in the resonant wavelength of the sensor.As a measurement result, the optical power at its drop port is detected in comparison with the sum of the powers at the through and drop ports.Simulations showed the possibility lovesense 3 of registering a change in the analyte refractive index with a sensitivity of 110 nm per refractive index unit.

The proposed scheme was analyzed with a broadband source, as well as a source based on an optoelectronic oscillator using an optical phase modulator.The second case showed the fundamental possibility of implementing an intensity interrogator on a PIC using an external typical single-mode laser as a source.Meanwhile, additional simulations demonstrated an increased system sensitivity compared to the conventional interrogation scheme with a broadband or tunable light source.The proposed approach provides the opportunity to increase the integration level of a sensing device, significantly reducing its cost, hydrangea red sensation power consumption, and dimensions.