Researches On Thermal Effect And Photoelectricity Characteristic Of VCSEL

This work was supported by the National "863" High Technology Project of China (No. 2003AA311070).Vertical-Cavity Surface-Emitting Laser (VCSEL) as a new type of light resource, compare to traditional Edge-Emitting Lasers, it has many advantages, such as ultralow threshold, single longitudinal mode operation, narrow beam divergence, easy two-dimensional integration. The advantages enable the wide applications of VCSELs in various fields, such as optical fiber communication, optical interconnect and integrated optical component. Great improvements have been achieved in researches and applications of VCSEL in recent years.In this dissertation, a quasi-three-dimension is built up. In this model, VCSEL's important characteristics (electricity characteristic, thermal characteristic and optical characteristic) are coupled directly. We take into account the interactions among the most important physical processes in the operation of VCSEL. Temperature varieties, modulation, modes competition of VCSELs are investigated.(1) Based on the rate equations which govern the interaction of carriers and photons inside of a VCSEL, the theoretic foundation is studied. We take into account the influence of factors such as diffusion of carriers, leakage current of the active region of VCSELs, the non-uniformity of injection current, and change of temperature on the operation mechanism of VCSELs, and found the simulation model and describe the detailed process that we found and realize the model.(2) The thermal characteristic of VCSEL is analyzed, and then discusses the effect of current on temperature and the relation in injection current, temperature and optical output.(3) We build up a VCSEL simulation model, describe the process of analysis of the model. Using the model we analyze the influence of the shape and situation of electrical connect, and the intensity of injection current on the characteristic of transverse-mode completion, and further take into account the non-uniformity of optical mode in azimuthally direction to discuss the influence of azimuthally distribution of injection current on the mode selection of VCSELs.