An optoelectronic integrated electric field measurement system based on double y-waveguide

Abstract

The invention relates to a photoelectric integrated electric field measurement system based on a double-Y waveguide, and belongs to the technical field of electric field measurement, wherein an output end of a laser source is connected with an input end of a lithium niobate Y waveguide electric field sensor through an input single-mode fiber. An output end of the lithium niobate Y waveguide electric field sensor is connected with an input end of a detector sequentially through a polarization maintaining fiber, a lithium niobate Y waveguide voltage modulator and an output single-mode fiber. Electric signals output by a detector go through a processor, so that control signals of an adjustable direct current source module are generated. The electric signals output by the detector are subjected to arithmetical operation by the processor to deduce to-be-measured electric field signals in an inverse mode. The adjustable dc source module is controlled to provide voltage signals for the lithium niobate Y waveguide voltage modulator in order to form a closed loop control. The measurement system is simple in structure, and costs of the measurement system are reduced. On-site calibration of parameters of a transfer function is realized, and the accuracy of measurement is raised. Feedback control of static state working points is realized. Influences by temperatures on the static state working points of the electric field sensor are overcome, and the stability of the measurement is raised.

Description

technical field [0001] The invention relates to a photoelectric integrated electric field measurement system based on double Y waveguides, belonging to the technical field of electric field measurement. Background technique [0002] Electric field measurement is of great significance in many fields of scientific research and engineering technology, especially in the fields of power system, electromagnetic compatibility and microwave technology. [0003] At present, the research on the photoelectric integrated electric field sensor has already been carried out at home and abroad, but it is mainly concentrated on the Mach-Zehnder interferometric photoelectric electric field sensor (application number: 200610011963.7, the invention name is a kind of sensor for strong electric field The patent application of the photoelectric integrated sensor for measurement) and the direct waveguide common-path interference electric field sensor (application number: 201210348311.8, the inventi...

AI Technical Summary

Problems solved by technology

There are three main disadvantages: first, the system includes polarizers, analyzers and other components, the system structure is complex, and the cost of building the system is high; second, sensor calibration is difficult to achieve on the measurement site, and the application range is limited to the laboratory environment ; The third is the static bias point of the sensor Lack of feedback control, once changes in environmental factors such as temperature cause changes, the static operating point of the sensor will deviate from the linear segment of the cosine function, and the measurement system loses its maximum sensitivity and approximately linear input-output transfer function characteristics

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