High-performance optical modulators bias control system without dither

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• 作者：Yanfei Hao ; Yangan Zhang ; Yvpeng Li ; Jinjing Tao ; Jinnan Zhang ; Xueguang Yuan ; Yongqing Huang
• 关键词：Modulators bias control ; Software-based ; The slope of the average optical output power
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：April, 2014
• 年：2014
• 卷：125
• 期：8
• 页码：1987-1989
• 全文大小：1013 K

文摘

A software-based bias control system of push-pull Mach-Zehnder modulators (MZMs) without dither tone is described in this paper. The slope of the average optical output power respect to the bias voltage is used to control the operating bias points in the automatic control system. The paper analyses the theory of automatic bias control intensively and verifies the effectiveness of the proposed technique which is a modulation-format-free method under the RF signal through testing and contrasting the BER (bit error rate) between the new technique and manual measure on the experimental platform. Based on this, an automatic bias control system set up by an optical QPSK composed by double MZMS on the LabVIEW platform is described.