Acta Photonica Sinica, Volume. 46, Issue 10, 1023002(2017)
Stable Bias Control Technique for Any-point Locking in Mach-Zehnder Modulator
A control algorithm to achieve working bias stability for Mach-Zehnder Modulator (MZM) is proposed. Its utilize first-order and cotangent value of Average Optical Power (AOP) with FPGA technique. Firstly, we describe the reason for stabilizing the MZM at the common point. Then, control theories for keeping the bias point at different working point are studied by numerical simulation. At last, arbitrary working point control system is built. Experiment results indicate that, the fluctuation of output average optical power is less than ±5% (within one hour) under the condition of 5 dBm laser output power (1 550 nm), 4.2 V half-wave voltage, 3 dB insertion loss and 1Gbps/1Mbps speed. The system has the ability to maintain the bias at any point in the optical power curve and improved the reliability of MZM in optical communication.
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HAO Chong-zheng, LI Hong-zuo, SUN Quan, YANG Yue, WANG Da-shuai. Stable Bias Control Technique for Any-point Locking in Mach-Zehnder Modulator[J]. Acta Photonica Sinica, 2017, 46(10): 1023002
Received: Jul. 10, 2017
Accepted: --
Published Online: Nov. 24, 2017
The Author Email: Chong-zheng HAO (perry_peace@163.com)