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根据Vernier效应可大幅度提高滤波器自由光谱范围和调谐范围,设计了一种热光可调谐级联微环滤波器.利用传输矩阵方法和有限元方法从理论上计算了对于第一级微环半径为48μm,第二级半径为50μm的级联微环滤波器的自由光谱范围和调谐范围可以达到75.6 nm,而功耗仅为103.1 mW,这是目前为止我们所知的基于微环谐振腔的硅基热光可调谐滤波器中最大的自由光谱范围和在如此低功耗下最大的调谐范围.利用有限元方法,还计算了半径为50μm微环的热光调谐响应时间,上升沿时间为3.5μs,下降沿时间仅为0.8μs.
According to the Vernier effect, the free spectral range and the tuning range of the filter can be greatly improved, and a thermo-optic tunable cascaded micro-loop filter is designed. Using the transfer matrix method and the finite element method, The free spectral range and tuning range of a 48 μm radius and 50 μm second-order cascaded micro-loop filter can reach 75.6 nm with a power consumption of only 103.1 mW, which is what we know so far based on the micro-ring resonator , The maximum free spectral range of silicon-based thermo-optic tunable filter and the maximum tuning range under such a low power consumption are also studied.The thermal tuning response time, the rise time 3.5μs, the falling edge time is only 0.8μs.