Method And Experimental Study On Waveguide Optical Phased Arrays Scanning Control

Waveguide Optical Phased Arrays(WOPAs) have highlighted advantages in low control voltage,low power consumption and response speed etc., which overcome some obstacles of prior Optical Phased Arrays(OPAs). This paper focus on the research on the beam steering method and experimental system of waveguide optical phased arrays. Therefore, Optical waveguide phased array beam scanning technology has theoretical significance and application value.According to electromagnetism theory of dielectric waveguide and the method of diffraction superposition principle, the Transmission characteristics, the coupling characteristics of optical field distribution in the WOPAs and the model of spatial radiation field distribution is analyzed. And analysis of the impact of the structural parameters to the field provides a theoretical basis for the rational design of optical waveguide array devices.With the control system of WOPAs based on FPGA, an experiment system of WOPAs is established. According to the electro-control theory and the 2π electro-control scheme, the beam scanning is realized. Maximum deflect angle of 13.3°, maximum scan angle error of 0.5°, and scanning speed of 200 kHz is realized. Through serial communication and keyboard control, automatic scanning and manual scanning of the beam is realized. Therefore the results confirm Principle and feasibility of waveguide optical phased arrays. Through the serial communication to adjust the calibration voltage online,it is benefit to the online phase correction, and laid the foundation for the realization of adaptive phase calibration system.Based on the analysis of the effect of optical waveguide device processing error on the space radiation field of WOPAs, as well as a detailed analysis of the experimental results, phase calibration models based on the Hooke-Jeeves method are studied. It can observe the beamsteetring with high precision and high diffraction efficiency can be obtained, which provides basis for the realization of adaptive phase calibration system.