非对称马赫-曾德尔干涉仪型不等带宽光学梳状滤波器  

Asymmetric Mach-Zehnder interleave with different output spectral bandwidths

作　　者：章宝歌[1] 李碧琦[2] 鲁彦[3] 

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070 [2]兰州城市学院数学学院,甘肃兰州730070 [3]西南交通大学峨眉校区电气工程系,四川峨眉614202

出　　处：《光学精密工程》2010年第10期2150-2155,共6页Optics and Precision Engineering

基　　金：甘肃省自然科学基金资助项目(No.0803RJZA027)

摘　　要：为提高光交错复用器系统带宽的有效利用率,满足系统中不同传输速率对带宽的要求,针对信道间隔为50 GHz的输入信号提出了新的非对称MZI型不等带宽光学梳状滤波器,研究了该系统的输出谱和制作方法。基于光纤传输理论分析了设计构成,给出了输出谱表达式及设计中所需要的实验参量。当滤波器的两对光纤干涉臂长度差相等,各耦合器的耦合系数选取适当时,该器件实现了奇偶信道上不等带宽输出,可分别用于10 Gb/s和40 Gb/s传输,信道间隔为0.8 nm,信道隔离度>25 dB;分析还发现该器件对3个耦合器的耦合参数不敏感。实验表明:该器件不仅能实现不等带宽输出功能,在实际制作过程中还由于器件对耦合器的耦合参数要求不是十分严格而降低了器件实际制作难度,因此具有实用价值。To improve the utilization efficiency of bandwidth in an interleaver system and satisfy the requirements of different transmission speeds for different passbands, a novel design scheme of 50 GHz unequal passband interleaving filter with an all-fiber MZI was put forward. Based on the principle of fiber transmissivity method, the MZI all-fiber optical different output spectra using three single-mode fiber couplers connected with single-mode fibers were analysed, and the complex amplitudes of output spectra were established with the expressions described by the coupling coefficients and length differences. Experiments indicate when the length differences of interference arms show the same＇value and the appropriate coupling coefficients of the couplers are chosen, the device can split an input beamwith channel space of 50 GHz into two beams, and one is odd channel for 10 Gb/s and the other is even channel for 40 Gb/s. Furthrmore,the space between the two channels is 0.8 nm and channel isolation is more than 25 dB. Finally,it points out that the interleaver is not sensitive to the coupling coefficients from three kinds of couplers and the coupling ratios of couplers can be controlled accurately. Obtained experimental results are in good agreement with the analytical ones.

关 键 词：光纤耦合器 马赫-曾德尔干涉仪 不等带宽 光学梳状滤波器 

分 类 号：TN253[电子电信—物理电子学] TN713