摘要
针对全光纤级联Mach-Zehnder干涉仪型(CMZI)波长交错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CMZI型波长交错滤波器并进行了分析。分析结果表明:组成滤波器干涉臂的第二对臂长差为第一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、透射率形态近似于方波的波长交错滤波器。与通常的CMZI相比,最大的优点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CMZI型波长交错滤波器的制作困难。最后进行了实验研究,实验所得结果与理论结果相吻合。
An all-fiber flat-top interleaver of Cascaded M-Z Interferometer (CMZI) using a 2 × 2 and two 3 × 3 fiber couplers with approximate rectangular wavelength response was developed. The relationships among the coupling ratios of the couplers, the length difference of interference arms, and the intensity transmission spectrum were analyzed. The results indicate that a uniform flat-top spectral response can be obtained by the configuration when the length difference of interference arms and the coupling coefficient of the couplers are some certain values and the passband and stopband of optical interleaver can be improved remarkably. Compared with conventional CMZI, the most advantage of the present method is that the coupling ratio of couplers can be controlled accurately. Finally, a novel structure of interleaver is fabricated using fused biconical taper technics in experiment. The experiment results agree with the analytical ones well.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2007年第7期1021-1025,共5页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.50475109
10572055)
甘肃省教育厅研究生导师科研资助项目(No.0604-07)
兰州交通大学"青蓝"工程资助项目
