第18卷第7期 2010年7月
文章编号1004-924X(2010)07-1483-08
光学精密工程
Optics and Precision Engineering
Vol.18No.7
Jul.2010
全光纤MZI型三信道波长交错滤波器的改进
任恩思1，鲁彦？，鲁怀伟，罗冠炜
（1.兰州交通大学数理与软件工程学院，甘肃兰州730070； 2.西南交通大学峨眉校区电气工程系，四川峡眉614202）
摘要：为改善全光纤三信道波长交错器的输出特性，提出了一种不对称结构的三光纤臀Mach-Zehnder干涉仪（A-MZI)，这种光纤干涉仪由一个一字型3×3单模光纤耦合器和一个品字型3×3单模光纤耦合器以及三条光纤干涉臂组成，其中一字型3×3单模光纤耦合器作为输人耦合器，品字型3X3单模光纤耦合器作为输出耦合器。推导了该器件的输出表达式，并进行了数值模拟。模拟结果表明，与常规的全光纤MZI型三信道波长交错器（C-MZI)相比，本文提出的交错滤波器的信道间功率旁摄降低了约13.6dB，并且具有对器件参数偏差不敏感等优点。用光纤熔融拉锥法实验制作了该器件，实验结果与理论分析吻合得很好，实验样品的信道间功率旁值<一34.6dB，插人损耗<1.0dB，信道隔离度 >30 dB
关键词：光纤光学；光纤弱合器；交错滤波器，Mach-Zehnder干涉仪；波分复用
中图分类号：TN256;TN713
文献标识码：A
doi:10. 3788/OPE.20101807.1483
Improvementofall-fiberthree-channelinterleaver
basedonMach-Zehnderinterferometer REN En-en',LU Yan’,LU Huai-wei',LUO Guan-wei
(1.School of Mathematics,Physics &Sofruare Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China; 2.Departmentof ElectricalEngineering,Emei Campus,SouthwestJiaotong University,Emei 614202,China)
Abstract: In order to improve the transmission performance of the all-fiber three-channel interleaver, a novel asymmetrical structure of a Mach-Zehnder interferometer(A-MZI) with three fiber arms is pro posed. The A-MZI consists of a fused planar 3X3 coupler, a fused triangular 3X3 single mode fiber coupler and three fiber arms in series,in which the planar 3 X 3 coupler is used as an input coupler, and the triangular 3 X 3 coupler as an output coupler. The output expression is derived and the numerical simulation is performed. The simulation indicates that the crosstalk characteristics and the coupling coefficient-angle tolerance can be improved greatly, and the sidelobe level of channel of the proposed device has been reduced more than 13. 6 dB as compared with that of the conventional all-fiber three channel interleaver. A interleaver is fabricated with the fused biconical taper technics in an experi-ment. The experimental results are in good agreement with the analytical ones. The result shows that the measured sidelobe level and the insertion loss are less than 34. 6 dB and 1. O dB,respectively,
收稿日期：2010-03-20；修订日期：2010-06-18.
基金项目：国家自然科学基金资助项目（No.10972095)；甘肃省自然科学基金资助项目（No.0803RJZA027）