Bias voltage control device of electrooptic modulator and control method thereof

Abstract

The invention discloses a bias voltage control device of an electrooptic modulator and a control method thereof. The bias voltage control device is a bias voltage drive developed aiming at the electrooptic modulator. By controlling bias voltage of the electrooptic modulator, the aim of ensuring that the electrooptic modulator stably works at a proper work place can be achieved. A photoelectric detector (1), a transimpedance amplifying circuit (2), an analogue-digital converting circuit (3), a controller (4) and an output drive circuit (5) of the bias voltage control device are connected in sequence; pulse light modulated by the electrooptic modulator splits out a part of light signals through an optical coupler to be connected with the input end of the photoelectric detector (1); and the output end of the output drive circuit (5) is connected with a bias voltage input port of the electrooptic modulator for controlling the bias voltage of the electrooptic modulator. The device realizesthe automatic control of the bias voltage of the electrooptic modulator, so that the electrooptic modulator continuously works at stable extinction ratio and the work stability of the electrooptic modulator can be improved.

Description

technical field [0001] The invention relates to a bias voltage driver of an electro-optic modulator, which is used for supplying a suitable bias voltage to the electro-optic modulator so that the electro-optic modulator works at a proper working point. It belongs to the field of automatic control. Background technique [0002] Electro-optic modulator is an optical device widely used in high-speed optical communication, optical fiber sensing and other fields. However, due to the structure of the electro-optic modulator, the operating point of the electro-optic modulator will slowly drift due to ambient temperature, mechanical distortion, mechanical vibration, and polarization state changes of the input light (shown in the view figure 2 ), resulting in a decrease in the extinction ratio of the electro-optic modulator and a deterioration in performance, which brings trouble to the application of the electro-optic modulator. Therefore, it is very necessary to automatically tra...

AI Technical Summary

Problems solved by technology

[0004] 1. The structure is complex, there are high requirements on the speed and precision of the components that make up the system, the cost is high, and it is difficult to realize

[0005] 2. It is not an independent system and requires the help of additional equipment (such as a PC), and is not easy to be used in instruments with limited volume and cost or other portable modular equipment;

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