Research On Coupling Performance Of Optical Fiber And Photodetector

In recent years,with the rapid development of communication industry,optical components also got rapid development.The optical communication system relies on the support of optical communication devices.In the packaging process of optical devices,the coupling of light to photodetector chip plays an important role,and the coupling efficiency directly affects the overall performance of optical communication system.Therefore,the packaging of optical fiber and photodetector has become the focus of many industries,and the key technology of optical fiber and photodetector packaging is how to realize the low-loss coupling of optical fiber and photodetector.First of all,using FDTD algorithm analyzes the planar optical fiber and inclined optical fiber mode field propagation characteristics,including electric field,the energy distribution characteristics.The influence of the coupling distance on the optical power and the size of the mode spot is studied,and the influence of coupling distance on coupling efficiency is determined according to the distribution of mode spots.Based on the study of the coupling performance between the optical fiber and the photodetector,the coupling performance between the optical fiber array and the photodetector array is further studied.The coupling performance between the single-wavelength optical fiber array and the multi-wavelength optical fiber array and the photodetector array is analyzed respectively.Then,according to the coupling model of planar optical fiber,inclined optical fiber and photodetector,the experimental system is built,and the influence of coupling distance on coupling efficiency is analyzed.The air gap fabry-Perus cavity formed by the planar optical fiber end face and the photodetector’s surface is used to measure the coupling distance between the optical fiber and the photodetector.Finally,the eye of the photodetector is tested.The eye diagram is denoised by the mean filter and the low-pass filter to optimize the performance of the eye diagram.72 figures,4 tables,53 references.