光纤布拉格光栅可调谐双向光分插复用器关键技术

Tunable Bi-Directional Optical Add-Drop Multiplexer Based on Fiber Bragg Grating

提出一种基于光纤布拉格光栅(FBG)的可调谐双向光分插复用器(Bi-OADM),并对该OADM进行了理论分析和实验搭建。分别利用开环和闭环压电陶瓷(PZT)对OADM的上/下载波长进行调谐,调谐范围可达到6 nm(商用的8波长复用系统波长范围为5.6 nm),实验发现在小电压时采用开环控制,在大于80 V时采用闭环控制,加载电压和卸载电压曲线重复性好。与此同时利用光开关和可选择路径机制,使OADM具有双向传输的功能,实验结果显示可调谐Bi-OADM的插入损耗能降低到4 d B,由于采用了双向结构,当某一方向的光路(顺行)发生断路时,另一方向(逆行)能够继续传输信号,因此大大提高了OADM的可靠性。

A tunable bi-directional optical add-drop multiplexer（Bi-OADM） based on fiber Bragg grating（FBG）is proposed and demonstrated. The center wavelength of the optical add-drop multiplexer（OADM） is tuned without chirp by using open and closed piezoelectric ceramic（PZT） separately. The tunable range can reach 6 nm, while the range of commercial eight wavelengths multiplexing system is 5.6 nm. The experiment shows a good reproducibility in the voltage load and unload curves when using open loop in small voltage and using closed loop in big voltage（more than 80 V）. Employing optical switches and alternate-path switching scheme, the bi-directional transmission can make one-direction light path normally transmit when the other direction light path is fail in the ring network, which can greatly improve the reliability of OADM. The experimental results indicate that the tunable Bi-OADM shows a low insert loss（4 d B）.