垂直腔半导体光放大器带宽特性研究

Study on optical bandwidth characteristic of vertical cavity semiconductor optical amplifiers

为了研究垂直腔半导体光放大器(vertical cavity semiconductor optical amplifiers,VCSOA)中抽运光功率、分布布喇格反射镜(distributed Bragger reflector,DBR)周期数以及输入信号强度对其带宽特性的影响,采用传输矩阵法进行了数值模拟。计算模型中考虑了载流子和光强沿纵向的分布,以及腔内介质折射率的不均匀性对光波传输的影响。得到的结果与文献中的结论符合较好。结果表明,提高VCSOAs的抽运水平可以增大其峰值增益,同时会缩小其增益带宽;减小DBR周期数可以获得更大的增益带宽积。另外,输入光信号强度对VCSOA带宽的大小也有较大的影响。

Based on the transfer matrix method, the effects of the pump optical power, the distributed Bragger reflector （DBR） periods and the intensity of the input optical signal on the optical bandwidth characteristics of vertical cavity semiconductor optical amplifiers （VCSOAs） are simulated numerically. The computer model includes the longitudinal distribution of cartier and optical intensity and the influence of the ununiformity of the refractive index of the material inside the cavity on the propagation of the optical signal. The obtained results agree well with the conclusion of previous literatures. The results show that the enhancement of the pump level will increase the peak gain of VCSOAs and decrease the optical bandwidth simultaneously; reducing the DBR periods will induce larger optical gain bandwidth product. In addition, the intensity of input optical signal will obviously affect the range of the optical bandwidth of VCSOAs.