光程不等对耦合双环谐振器传输特性的影响

Influence of Optical Path Difference on Transmission Characteristics of Coupled Double-Ring Resonators

分析了两环光程不等对耦合双环谐振器透射谱的影响,并将其与单环谐振器的透射谱进行了比对,揭示了两环光程变化对结构传输特性影响的规律。分析结果表明,当两环光程不相等时,无论是否满足模式分裂条件,都会产生不对称的一窄一宽两个谐振峰,分别对应光在远离总线的环和靠近总线的环内的谐振。两个谐振峰的位置同时受两环之间耦合器的透射系数和两环光程偏离程度的影响。所研究的两环周长不相等的耦合双环谐振器的传输特性,可以为耦合双环谐振器的制作和传感应用提供理论指导。

Influence of optical path difference on the transmission spectra of coupled double-ring resonators （CDRR） is analyzed, and the transmission spectra of CDRR are compared with those of single-ring resonators. The influence of double-ring optical path variation on the structural transmission characteristics is revealed. The results show that when the double-ring optical paths are different, two asymmetrical resonant peaks, one narrow and one wide, are generated regardless of whether the splitting condition is satisfied. The two peaks correspond to the resonances of the light in the rings that are far from and close to the bus waveguide, respectively. The positions of the two resonant peaks are affected by both the transmission coefficient of the coupler between the two rings and the degree of deviation of the two-ring optical path. The study on the transmission characteristics of the CDRR with unequal ring optical paths can provide theoretical guidance for the fabrication and sensing application of CDRR.