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为了在10Gb/s+40Gb/s混合系统中提高光学奇偶交错滤波器的带宽利用率,提出了基于两级级联马赫-曾德尔干涉仪(MZI)的全光纤型不等带宽光学交错滤波器的设计方案。通过对耦合器分光比、干涉仪臂长差等结构参量的选择,详细分析了两级级联MZI的不等带宽交错滤波器的传输特性,并选取了理论优化计算的一组数据进行实验。数值分析和实验结果表明,该器件将50GHz的输入信号分离成信道间隔为100GHz的奇偶两路输出信号,其中在3dB处,奇数信道带宽大于30GHz用于10Gb/s传输,偶数信道带宽大于60GHz用于40Gb/s传输。该滤波器较传统的等带宽交错滤波器有更高的带宽利用率,在10Gb/s向10Gb/s+40Gb/s升级过程中作为复用/解复用器具有很大优势。
In order to improve the bandwidth efficiency of the optical parity interleaved filter in 10Gb / s + 40Gb / s hybrid system, an all-fiber unequal-bandwidth optical interleaving filter based on two cascaded Mach-Zehnder interferometer (MZI) Design. Through the selection of structural parameters such as coupler splitting ratio and interferometer arm length difference, the transmission characteristics of unequal-bandwidth interleaving filter of two-stage cascaded MZI are analyzed in detail, and a set of data which is theoretically optimized and calculated is selected for experiment. Numerical analysis and experimental results show that the device separates the 50GHz input signal into two odd and even output signals with channel spacing of 100GHz, where the odd channel bandwidth is greater than 30GHz for 10Gb / s and the even channel bandwidth is greater than 60GHz Transmission at 40Gb / s. The filter has a higher bandwidth utilization than the traditional equal-bandwidth interleaving filter, which has great advantages as a multiplexer / demultiplexer at 10Gb / s to 10Gb / s + 40Gb / s.