一种新型级联M-Z波长交错器的设计与实验  

Design of a New Type Interleave Based on Cascaded M-Z Interferometer

作　　者：鲁怀伟[1] 褚衍东[1] 罗冠炜[1] 

机构地区：[1]兰州交通大学数理与软件工程学院

出　　处：《光电子．激光》2007年第12期1426-1429,共4页Journal of Optoelectronics·Laser

摘　　要：提出了由1个2×2和3个3×3单模光纤耦合器级联组成的全光纤Mach-Zehnder干涉仪(MZI)型波长交错滤波器。分析结果表明:组成滤波器干涉臂的第2对臂长差为第1对臂长差的偶数倍时,耦合器分光比取一些定值可得到输出波形通带平坦、阻带加宽和透射率形态近似于方波的波长交错滤波器。与通常的MZI相比,其最大的优点就是:在实际制作时可以对每个耦合器的分光比进行准确的监测和控制,大大降低了MZI型波长交错滤波器的制作困难。通过实验所得的结果与理论相吻合。An all-fiber interleaver of cascaded M-Z interferometer（MZI） using a 2 × 2 and three 3× 3 fiber couplers with almost rectangular wavelength response is developed by using a new configuration. Based on the digital approximation method of Fourier series,the relationsips among the coupling ratios of the couplers,the length difference of interference arms and the intensity transmission spectrum are analyzed. The results indicate that a uniform flattop spectral response can be obtained when the length difference of interference arms and the coupling coeffident of the couplers are equal to certain values. The passband and stopband of optical interleaver are improved remarkably. Compared with conventional MZI using 2 ×2 fiber couplers, the most advantage of the present method is that the coupling ratio of couplers can be controlled accurately because the interference effect of the monitor light can be sheered away in the course of fabricating couplers. A novel structure of filter is fabricated by using the fused biconical taper technics in experiment. The experiment results are in good agreement with the analytical ones.

关 键 词：应用光学 梳状滤波器 Mach-Zehnder干涉仪(MZI) 波长交错滤波器 方向耦合器 

分 类 号：TN253[电子电信—物理电子学] TN929.11