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将环形谐振器与马赫-曾德尔干涉仪相结合,利用谐振器反馈回路引入的相位调节效应,选择合适的谐振器耦合角,设计出一种具有最大平坦滤波响应的环形谐振器辅助马赫-曾德尔干涉型波长交错滤波器。与普通马赫-曾德尔干涉型波长交错滤波器相比,不仅阻带抑制(>38dB)和过渡带滚降特性明显加强,而且在通带中心15GHz范围,将色散降低到±10ps/nm以内,从而可以有效避免对传输信号造成失真。在此基础上,进一步研究环周长(Lr)与马赫-曾德尔干涉臂长差(ΔL)之间的关系,指出波长交错滤波器奇偶输出端口的带宽分配比直接决定于Lr/ΔL,当调整Lr/ΔL=1/2,可以实现具有1∶2非对称带宽分配特性的新型波长交错滤波器,为10Gb/s向10Gb/s+40Gb/s系统升级提供一种简单、灵活的方式。
Combining a ring resonator with a Mach-Zehnder interferometer, a ring resonator with the largest flattened filter response is designed to assist the Mach-Zehnder with the help of the phase adjustment effect introduced by the resonator feedback loop and the proper resonator coupling angle Del - interference type wavelength interleaving filter. Not only the rejection of stopband (> 38dB) and the roll-off of transition band are significantly enhanced compared with the conventional Mach-Zehnder interference-type wavelength interleaving filter, but also the dispersion is reduced to within ± 10ps / nm in the 15GHz passband center, Which can effectively avoid distortion of the transmitted signal. On this basis, the relationship between the ring perimeter (Lr) and Mach-Zehnder interfering arm length difference (ΔL) is further studied. It is pointed out that the bandwidth allocation ratio of the parity output port of the wavelength interleaver is directly determined by Lr / ΔL. By adjusting Lr / ΔL = 1/2, a new wavelength interleaving filter with 1: 2 asymmetric bandwidth allocation can be provided, providing an easy and flexible way to upgrade 10Gb / s to 10Gb / s + 40Gb / s systems.