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根据耦合模理论,给出了1×N信道微环谐振波分复用器(MRRWM)的光强传递函数通用公式,并分析了微环谐振波分复用器的传输特性。利用参量优化结果,在中心工作波长约为 1.55μm、波长间隔约 5.6 nm的情况下,对1×8信道硅基聚合物微环谐振波分复用器进行了数值模拟。计算结果表明,该器件具有以下优良的性能:分波光谱准确,自由光谱区约为18 nm,对于半径10μm以上的微环弯曲损耗很小,且器件的插入损耗主要由波导的传输损耗决定,振幅耦合比率为0.2时对应的每条竖直输出信道的插入损耗在0.57 dB以下,信道间的串扰小于-18.5 dB,输出谐振峰3 dB带宽可达0.25 nm,最小背景光的强度约为3.8×10-4。
According to the coupled-mode theory, the general formula of the light intensity transfer function of a 1 × N channel microring resonant MRM is given, and the transmission characteristics of the microring resonating wavelength division multiplexer are analyzed. By using the optimized results, the numerical simulation of a 1 × 8 channel silicon-based polymeric microring resonator was carried out with a central operating wavelength of about 1.55 μm and a wavelength separation of about 5.6 nm. The calculated results show that the proposed device has the following excellent performance: the spectroscopic spectrum is accurate, the free spectral region is about 18 nm, the bending loss of the microring ring with a radius of more than 10 μm is very small, and the insertion loss of the device is mainly determined by the transmission loss of the waveguide. When the amplitude coupling ratio is 0.2, the insertion loss of each vertical output channel is less than 0.57 dB, the crosstalk between channels is less than -18.5 dB, the output resonant peak 3 dB bandwidth is up to 0.25 nm, and the minimum background light intensity is about 3.8 × 10-4.