Research And Development Of 100GHz High Speed Optical Waveguide Detector

Photoelectric detector is a kind of photoelectric device which converts optical signal into electrical signal.It is a very important component of optical fiber communication system.With the progress of science,the performance of photodetectors is also improving.Scientists require photodetectors to have both high output power and high response speed.However,In Uni-Traveling-Carrier photodetector,only the electron is active carriers.Combining with the structure of optical waveguide,it has the advantages of high saturation output and high speed,which is of great research significance.The main work of this paper is to focused on designing a 100 GHz high-speed Uni-Traveling-Carrier WaveGuide photodetector,and has the following achievements:1.The theoretical knowledge of Uni-Travaling-Carrier photodetectors and waveguide photodetectors has been fully studied,and the relevant numerical simulation software and device simulation software also has been learned.2.The energy band structure,electric field intensity,current density and carrier concentration distribution inside the photodetector are analyzed in detail,and I analyze the influence of material heterojunction surface structure on the photodetector.At the same time,we analyze the characteristics of the photodetector under AC small signal.3.A Uni-Travaling-Carrier optical waveguide photodetector is designed,which combines Uni-Travaling-Carrier structure with optical waveguide structure,and its twodimensional model is established.Based on supermode theory and numerical simulation software BeamProp,the vertical coupled waveguide detector is simulated.The simulation results show that the optical power is absorbed uniformly by the absorption layer due to the coupling of the upper and lower waveguides,which makes the photocurrent distribution uniform.4.Through the device simulation software ATLAS,the micro-characteristics of the photodetector(band structure,carrier concentration distribution,electron mobility speed,etc.)are researched in detail.At the same time,the bandwidth and responsiveness of the photodetector are obtained by simulating the small signal characteristics of the device,and the design of the 100 GHz high-speed optical waveguide photodetector is analyzed.Through device simulation,the response bandwidth of the Uni-Travaling-Carrier waveguide photodetector can reach 103 GHz,and achieved the purpose of research.5.I built an experimental platform for photodetector performance testing,and I use this experimental platform to test the performance of photodetectors designed previously.Experiments demonstrate that the photodetector has the characteristics of photodiode and the responsibility of photodetector can reach 0.75 A/W.Finally,through the experiment,I draw the curve of the photodetector’s response photocurrent with the incident light power.This verifies the feasibility and accuracy of the experimental platform to test the performance of photodetectors,and lays a foundation for the performance test of 100 GHz high-speed optical waveguide photodetectors in the future.