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作为新兴的群组滤波技术,interleaver技术与传统的DWDM技术相结合,可以在不增加新光纤及器件技术难度的基础上使原有DWDM系统的复用波长数增加一倍。耦合一个谐振微环到光纤熔锥型非平衡马赫-曾德尔干涉仪型波长交错滤波器系统中,利用微环的相位引入改善交错滤波器的响应函数,选择适当的微环耦合角,使其带通平坦性和阻带抑制比得到改善,理论优化阻带抑制(>40 dB)能得到明显加强。分析微环周长(Lr)与马赫-曾德尔干涉臂差(△L)的关系,指出:波长交错滤波器奇偶输出带宽分配比直接取决于Lr/△L,当Lr/△L=2时,可以实现1:1对称带宽分配特性的交错滤波器;当Lr/△L=0.5时,可以实现1:2非对称带宽分配特性的交错滤波器;最终得到灵活的带宽分配交错滤波器。
As a new group filtering technology, interleaver technology combined with traditional DWDM technology can double the multiplexing wavelength of the original DWDM system without adding new optical fiber and device technology. Coupling a resonant micro-loop to a fiber-optic taper unbalanced Mach-Zehnder interferometer type wavelength interleaving filter system, the use of the micro-loop phase to improve the interlacing filter response function, select the appropriate micro-ring coupling angle, so that Bandpass flatness and stopband rejection ratio are improved, the theoretical optimization of stopband rejection (> 40dB) can be significantly enhanced. The relationship between microrings perimeter (Lr) and Mach-Zehnder interfering arm difference (ΔL) is analyzed. It is pointed out that the bandwidth allocation ratio of the odd-even output of the interleaver depends on Lr / ΔL. When Lr / ΔL = 2 The interleaver can achieve 1: 1 symmetric bandwidth allocation. When Lr / △ L = 0.5, the interleaver with 1: 2 asymmetric bandwidth can be realized. Finally, a flexible bandwidth allocation interleaver is obtained.