高速850nm VCSEL的研制
[Abstract]:The vcsel has a high modulation rate, is easy to be high-speed communication, the circular light spot is easy to be coupled with the optical fiber, and has the advantages of being beneficial to low power consumption, easy two-dimensional integration, mature and reliable process, easy integration with other photoelectric devices and the like, and has been deeply researched. With the increasing demand of high-bandwidth and low-power-consumption green data communication in the large data era, the high-speed VCSEL is becoming one of the most mainstream high-speed light sources, so it is necessary to study the high-speed modulation mechanism of the VCSEL and the main influencing factors to limit the high-speed modulation characteristics. the contradiction between the transmission rate and the power consumption is solved, and the high-speed VCSEL is one of the light sources in the optical network such as high-speed optical communication and optical interconnection. This paper is aimed at high-speed optical communication. In order to develop the VCSELs with a bandwidth of more than 10GHz, the high-speed modulation characteristics and the limiting factors of the 850nm VCSEL are studied theoretically, including the relaxation oscillation frequency, the heat, the parasitic RC parameters and the microwave reflection characteristics of the electrode structure. In this paper, a VCSEL with a bandwidth of greater than 10GHz is prepared on the experiment, and the research and optimization of the static and dynamic properties of the prepared VCSEL are carried out. The experimental results are consistent with the theoretical analysis and the software simulation. The main contents and conclusions of this thesis are as follows: 1. The main factors that limit the high-speed modulation of VCSELs include: the relaxation oscillation frequency, the damping and the parasitic RC circuit. The relaxation oscillation frequency is the most important factor of the high-speed VCSEL's high-speed modulation. By the derivation of the relaxation oscillation frequency, it is found that the main limiting factors for limiting the relaxation oscillation frequency are the differential gain and the photon life of the quantum well. the parasitic RC of a VCSEL device is studied and a parasitic circuit model of the device is established, and the high-frequency response characteristic of the parasitic circuit and the microwave reflection characteristic of the electrode structure are studied by using the two-port network theory. The key technologies for preparing high-speed VCSELs are: wet etching, wet-nitrogen oxidation of Al Ga As and etching of BCB. The anisotropy of the Al Ga As material in the process of wet etching and wet-nitrogen oxidation is the cause of the presence of an eye-type in the oxide aperture, but the effect of the parasitic RC parameters in the VCSEL prepared in this experiment is not large. The reason of the glass-like residue which is difficult to etch and insulate during the etching process of BCB is studied. The VCSELs with four mesa-sized single-mesa heterohedral electrode structures were fabricated, and the static characteristics of the devices were studied, and the dynamic characteristics of the VCSELs were studied. the-3d b bandwidth of the prepared vcsel is greater than 10ghz, approximately 12ghz, and the test of the bandwidth is limited by the test bandwidth of the experimental apparatus; and it is found that the-3d b bandwidth of the vcsel tends to decrease as the drive current increases, mainly because the leakage of carriers in the quantum well is increased with the increase of the heat, and the differential gain is reduced. The experimental results are consistent with the theoretical analysis and the software simulation. The reflection characteristics of different surface electrode structures and its influence on the high-speed modulation characteristics of VCSEL are studied by two-port network. The relationship between the characteristic impedance and the parameter of the electrode structure is studied. The reflection coefficient of the heterohedral electrode structure of the VCSEL prepared by the experiment is 22%, and it is found that the width of the signal line is increased and the film thickness is reduced, and the impedance matching can be realized. The characteristic impedance was ~ 50 惟 when the film thickness was 100. m u.m and the width of the signal line was 70. m and the relationship between the characteristic impedance and the parameters related to the surface electrode structure is studied, the characteristic impedance of the electrode structure is found to be the largest, the thickness of the BCB, the width of the electrode, and the width of the positive and negative electrode lines is required to be greater than 30 mum; 5. The extraction of the RC parameters of the VCSEL is carried out, and the equivalent circuit of the device is established: its-3dB bandwidth is greater than 10GHz.
【學位授予單位】:北京工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN248
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