| Citation: | LI Tuohang, ZHOU Xiaoyan, ZHANG Lin. Study on the transmission characteristics of Silicon-Based grating-type fabry-perot-microring coupled resonators[J]. Chinese Optics. doi: 10.37188/CO.2025-0129
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This paper presents comprehensive theoretical and experimental investigations on the transmission spectral characteristics of an integrated photonic structure consisting of a microring resonator coupled with a Fabry–Perot (FP) cavity. The FP cavity is realized by introducing a grating reflector into the straight waveguide of a single-side-coupled microring. Within this dual-resonator configuration, novel multi-cavity coupled transmission spectra are achieved. A systematic theoretical model is established to analyze the conditions under which these multi-cavity coupled spectral profiles appear, and the structural parameters are subsequently optimized. A grating-type Fabry–Perot–microring coupled resonator device was successfully fabricated on a silicon-on-insulator (SOI) platform. For the first time, multi-cavity coupled transmission spectra consistent with theoretical predictions were experimentally observed, including nested electromagnetically induced transparency (EIT)-like and double Fano resonance line shapes. Experimental measurements indicate that, under a waveguide loss of 3.43 dB/cm, the EIT central peak exhibits a quality factor of 1.40×104, while the slope of the double Fano resonance reaches 37.70 dB/nm. These results provide new insight into the underlying mechanisms of integrated photonic coupled resonator systems and demonstrate a viable approach toward highly integrated, high-performance photonic device platforms. The proposed structure shows strong potential for applications in high-sensitivity optical sensing, narrowband filtering, and high-speed modulation.
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