为了提高目前光纤通信系统的10 Gbit/s和40 Gbit/s混合系统的传输效率，提出了一种新型的器件结构以实现基于平面光波导的不等带宽交错滤波器。该结构结合光学微环与马赫曾德尔干涉仪结构，通过控制相关关键参数，实现了任意带宽比的光学交错滤波器，给出了带宽比为12的非对称交错滤波器设计实例。仿真结果表明，设计的交错滤波器在信道间隔为100 GHz的系统中给传输速率为10 Gbit/s和40 Gbit/s的两个信道分别分配了32.85 GHz和67.15 GHz的带宽，从而解决了传输速率为40 Gbit/s的信道带宽不足的问题。在此基础上通过分析器件中各双模干涉仪的光功率分配比对输出谱带宽比的影响，给出了在相同信道间隔条件下不同带宽比的非对称交错滤波器的设计实例。

In order to improve transmission efficiency of optical-fiber communication system for hybrid 10 Gbit/s and 40 Gbit/s system, a novel device configuration for realizing an asymmetrical optical interleaver based on planar optical waveguide is proposed, which is a clever combination of optical micro-ring and Mach-Zehnder interferometers. Theoretical results show that optical interleaver with arbitrary bandwidth ratio and with the proposed structure can be obtained by controlling some key parameters. As an example, an asymmetrical interleaver with 12 interleaving ratio is presented, which can apportion 32.85 GHz and 67.15 GHz passband bandwidth for the 10 Gbit/s and 40 Gbit/s channels over 100 GHz channel spacing respectively. Therefore, the bandwidth efficiency requirement of the 40 Gbit/s channel is relieved. Furthermore, by analyzing the effect of optical power splitting ratio of the three two-mode interferometers on the output spectrum bandwidth ratio, the design instances of asymmetrical interleaver with different bandwidth ratios at the same channel space are given.