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针对基于三个2×2单模光纤耦合器的全光纤级联Mach-Zehnder干涉仪型(CMZI)不等带宽光学梳状滤波器在实际制作过程中存在的问题,提出了由一个2×2和两个3×3单模光纤耦合器级联组成的全光纤不等带宽光学梳状滤波器,并进行了详细的分析。通过对光纤耦合器分光比、干涉仪臂长差等结构参量的选择,详细分析了其传输特性,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,一路信道用于10Gb/s传输,另外一路信道用于40Gb/s传输。与全光纤CMZI型不等带宽光学梳状滤波器相比,其最大的优点是在实际制作时可以对每个光纤耦合器的分光比进行准确的监视和控制,降低了全光纤不等带宽光学梳状滤波器的制作难度。最后进行了实验研究,实验所得结果与理论结果相吻合。
Aiming at the problems in practical fabrication of all-fiber cascaded Mach-Zehnder interferometer type (CMZI) unequal-bandwidth optical comb filter based on three 2 × 2 single-mode fiber couplers, a 2 × 2 And two 3 × 3 single-mode fiber coupler cascaded all-fiber unequal-bandwidth optical comb filter, and carried out a detailed analysis. Through the selection of structural parameters, such as the splitting ratio of optical fiber coupler and the difference of arm length of interferometer, the transmission characteristics 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, one channel for 10Gb / s transmission and the other channel for 40Gb / s transmission. Compared with all optical fiber CMZI unequal-bandwidth optical comb filter, the biggest advantage is that it can accurately monitor and control the splitting ratio of each optical fiber coupler in actual manufacture, reducing the optical bandwidth of all optical fibers Comb filter making difficulty. Finally, the experimental research is carried out. The experimental results are consistent with the theoretical results.