为了获得较大的尖锐度, 提升微环传感器的灵敏度, 提出利用眼型谐振腔结构在下路端输出的非对称Fano谐振光谱, 眼型谐振腔由一个外环和内环构成, 外环与总线波导耦合, 内环与外环耦合.利用传输矩阵法对下路端输出光谱进行了数值计算, 在不同剩余电场比例系数下, 发现非对称Fano谐振峰的尖锐度随电场剩余比例系数的增大而增大;改变外环与总线波导间的场强耦合系数和内环与外环之间的场强耦合系数, 其尖锐度的最大值随外环和内环场强耦合系数变化缓慢增大, 尖锐度最大值处谐振点传输系数值在不同电场剩余比例系数和内外环场强耦合系数下稳定在－6 dB附近.因此利用眼型谐振腔结构下路端的Fano谐振峰, 可获得对耦合系数不敏感的尖锐度和谐振点传输系数, 降低器件对耦合区加工准确度的要求.

The asymmetric Fano-resonance spectra was proposed to obtain a larger sharpness and elevate the sensitivity of ring resonator, the Eye-like resonator is utilized to generate the asymmetric Fano-resonance spectra, the Eye-like resonator consists two rings resonators with the outer loop coupled to two bus waveguides and the inner loop couple to the outer loop. Numerical calculation of spectra on the drop port was utilized by the transfer matrix method, as the round trip loss varies, the value of sharpness increases with the round trip loss;by changing the outer loop coupling coefficients and inner loop coupling coefficients, the maximum value of sharpness of Fano-resonance change slowly;as the round trip loss varies and a lager range of the outer loop and inner loop coupling coefficients, the corresponding transmission at the resonant point remains almost unchanged, about －6 dB. The sharpness of Fano resonant peak is insensitive for the coupling coefficients, which can reduce the requirements of manufacture of coupling region.