论文部分内容阅读
提出了一种基于级数展开的三维准矢量束传播法(SE_QV_BPM)用以分析由InGaAs/InAlAs多量子阱构成的脊形光波导及定向耦合器.结果表明,刻蚀深度相同时,TM模比TE模在水平方向限制强,且TM模的模场在波导角上出现畸变;波导间距相同时,定向耦合器TM波的耦合长度大于TE波的耦合长度,对偏振态敏感.分析获得了浅/深刻脊形光波导承载的准矢量TE/TM基模、定向耦合器承载的TE/TM偶/奇模的模场分布及其有效折射率,模拟了光场在定向耦合器中的传输演变情况.另外,SE_QV_BPM导出矩阵小,计算效率高;采用正弦基函数展开,对波导结构没有限制;引入了变量变换,避免了边界截断问题.
A three-dimensional quasi-vectorial beam propagation method (SE_QV_BPM) based on series expansion is proposed to analyze the ridge optical waveguide and directional coupler composed of InGaAs / InAlAs multiple quantum wells.The results show that TM mode Which is more limited than the TE mode in the horizontal direction and the mode field of the TM mode is distorted at the waveguide angle. When the waveguide spacing is the same, the coupling length of the directional coupler TM wave is greater than the coupling length of the TE wave and is sensitive to the polarization state. Mode field distribution of TE / TM even / odd modes carried by directional coupler and effective refractive index of quasi-vector TE / TM fundamental modes carried by shallow / deep ridge optical waveguides, the transmission of light field in directional coupler is simulated In addition, SE_QV_BPM has a small derivation matrix and high computational efficiency. With sinusoidal basis functions, there is no limit to the waveguide structure. Variables transformation is introduced to avoid boundary truncation problem.