硅基光栅型法布里珀罗-微环耦合谐振腔的传输特性OA

This paper presents comprehensive theoretical and experimental investigations on the transmis-sion 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 condi-tions under which these multi-cavity coupled spectral profiles appear,and the structural parameters are sub-sequently optimized.A grating-type Fabry-Perot-microring coupled resonator device was successfully fab-ricated 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 indic-ate 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 ap-proach 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.