Study of double-ring slow-light gyroscope with two input–output waveguides

Analysis of optical gyroscopes with vertically stacked ring resonators

“…Recent development in photonic integrated circuit (PIC) technologies introduced various new types of sensors [4], including gyroscopes. Utilizing nano-/micro-optical devices such as photonic crystals [5,6], microring resonators [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], and microsphere resonators [26], this new type of sensors can be lighter, more compact and scalable, compared to the bulky conventional ones which are implemented either by free-space optics or by fiber optics. Among the PIC implementations, the sensors based on microring resonators drew particular attention of many researchers.…”

“…Among the PIC implementations, the sensors based on microring resonators drew particular attention of many researchers. Various configurations have been studied (mostly theoretically) for optical gyroscopes, including coupled resonator optical waveguides (CROW) [7][8][9][10][11][12][13][14][15][16][17], side-coupled integrated spaced sequence of optical resonators (SCISSOR) [18], self-interference add-drop resonators (SIDAR) [19], add-drop multiplexers [20], double-ring resonators [21,22], and Mach-Zehnder interferometer [23]. The main operation principle of the ring-resonator-based optical gyroscopes can be described as the accumulation of the Sagnac phase ( ϕ Sagnac ) while light is rotating around the ring multiple times.…”