A study on frequency-shifted pulse light stability control for DP-MZM in coherent-OTDR

作者：Chen Wenjie; Jiang Junfeng^*; Liu Kun; Ma Zhe; Wang Shuang; Zhang Xuezhi; Ding Zhenyang; Liu Tiegen

来源：Conference on Advanced Sensor Systems and Applications VII, 2016-10-12 To 2016-10-14.

DOI：10.1117/12.2247765

• coherent-OTDR
• PSO
• bias control
• DP-MZM

In digital coherent optical time domain reflectometer (coherent-OTDR) system, a dual-parallel Mach-Zehnder modulator (DP-MZM) is employed to modulate the signal light and to generate frequency-shifted pulse light. However, the environment temperature strongly influent the stability of the DP-MZM. To stabilize the quality of the frequency-shifted pulse light, we proposed a bias control method to keep the modulator at the optimum bias. This bias control method search for the optimum bias by changing three bias voltages at the same time based on chaotic particle swarm optimization algorithm(PSO). The experimental results show obvious effect on locating the optimum bias voltages for the DP-MZM.

• 出版日期2016
• 单位天津大学