基于寄生网络的垂直腔面发射激光器频响特性

Frequency Response Characteristics of Vertical-Cavity SurfaceEmitting Lasers Based on Parasitic Network

随着信息快速增长时代的来临,人们对于数据带宽的需求不断提升,垂直腔面发射激光器(Vertical-Cavity Surface-Emitting Lasers,VCSEL)作为一种新型光通信器件得到广泛应用。从半导体激光器寄生电路出发,分析了VCSEL内部光电转换过程,考虑本征激光器以及外部封装寄生特性,分别搭建了大信号和小信号等效电路模型,并使用Python语言以及Pspice软件进行仿真。在大信号模型中分析自发辐射系数和光限制因子对阈值电流的影响,在小信号模型中讨论寄生网络参数对调制响应带宽的影响。仿真结果表明,通过对自发辐射系数、光限制因子以及寄生网络参数的调节,可以降低VCSEL器件的阈值电流,提高调制带宽。

With the advent of the era of rapid information growth,the demand for data bandwidth continues to increase.Vertical-Cavity Surface-Emitting Lasers(VCSEL)have been widely used as a new type of optical communication devices.Starting from the parasitic circuit of the semiconductor laser,the internal photoelectric conversion process of the VCSEL is analyzed,and the parasitic characteristics of the intrinsic laser and the external package are considered.The large-signal and small-signal equivalent circuit models are built respectively,and the simulation is carried out using Python language and Pspice software.The influences of spontaneous emission coefficient and optical confinement factor on the threshold current are analyzed in the large-signal model,and the influence of parasitic network parameters on the modulation response bandwidth is discussed in the small-signal model.The simulation results show that the threshold current of the VCSEL device can be reduced,and the modulation bandwidth can be increased,by adjusting the spontaneous emission coefficient,optical confinement factor and parasitic network parameters.