Research On Visual Positioning And Coupling Algorithm Of Microlens In Optical Emission Module

With the vigorous development of emerging technologies such as big data and Internet of things,it also promotes the rapid development of optical fiber communication devices and plays an increasingly important role in optical fiber communication technology.Optical transmitting module is an important device in optical fiber communication system.Its quality determines the stability and efficiency of an optical fiber communication system.An important process in the industrial production of optical emission module is the packaging of collimating lens,that is,coupling alignment.Therefore,in order to carry out precise and fast coupling alignment,machine vision technology and intelligent coupling algorithm are introduced into the packaging process of collimating lens.The coarse alignment and fine alignment of collimating lens are realized,which creates favorable conditions for full-automatic industrial production.The main research contents and conclusions of this paper are as follows:(1)The packaging technology of optical module and the WDM technology scheme for realizing high-speed performance of 100 g optical emission module are analyzed.The research status of coupling packaging technology and machine vision technology at home and abroad is introduced in detail.(2)The automatic packaging process design of 100 g optical emission module and the image processing algorithm of collimating lens clamping are studied and completed.The recognition success rate of lens clamping is 95%.The coarse alignment of lens and chip is realized by preprocessing such as gray value scaling,edge detection and threshold segmentation.The Hough line detection and iterative weighted least square method are used to fit the edge of the lens,calculate the tilt angle of the lens and correct the angle.The iterative fitting line method based on Tukey weight function performs rectangular fitting on the chip image to accurately calculate the position of the chip.A variety of focusing functions are evaluated for the substrate image,and the optimal evaluation function is selected to realize the height measurement of the substrate.The visual coarse alignment algorithm realizes that the position deviation in XYZ direction is within 30 um,which meets the needs of engineering.(3)The theoretical mode field analysis is carried out for DFB chip and singlemode fiber in 100 G optical emission module.Based on Gaussian beam propagation theory and coupling theory,the optical path structure and single path coupling efficiency of 100 G optical emission module are analyzed theoretically.(4)The coupling fine alignment problem is regarded as an optimization problem to find the optimal value.The ability of multi extremum optimization is evaluated through the test function for three algorithms: ant colony algorithm,artificial firefly algorithm and simulated annealing algorithm.The optimization mathematical model of fine alignment is established,the algorithm simulation is completed,and the simulation results of each algorithm are analyzed.The artificial firefly algorithm is improved,and simulation and experiment are carried out.Compared with the experimental results before and after the improvement,the search success rate of the improved algorithm reaches 90%.