为了能够实现垂直腔面发射激光器(VCSEL)偏振无关特性,提出了将偏振无关光栅与half-VCSEL集成的方法。基于严格耦合波法,分析了光栅参数对偏振无关二维光栅反射特性的影响,经过模拟计算,发现在光栅周期为691~719 nm、光栅宽度为408.73~467.60 nm时,偏振无关二维光栅有210 nm的高反射带宽。将偏振无关二维光栅与中心波长为1.55 μm的half-VCSEL进行集成,得到了中心波长为1.55 μm的偏振无关波长可调谐VCSEL,经过光学传输矩阵计算,可得该偏振无关波长可调谐VCSEL的波长调谐范围可达93 nm。

To realize a polarization-independent vertical cavity surface emitting laser (VCSEL), the polarization-independent grating and the half-VCSEL are integrated. Based on the rigorous coupled wave analysis, the effects of grating parameters on the reflection characteristics of a polarization-independent two-dimensional grating are analyzed. The 210 nm high-reflection bands of the polarization-independent two-dimensional grating for a grating period of 691-719 nm and a grating width of 408.73-467.60 nm are obtained via analog computation. Then, the polarization-independent two-dimensional grating and the half-VCSEL with a 1.55-μm central wavelength are integrated to develop a polarization-independent wavelength-tunable VCSEL with the 1.55-μm central wavelength. The calculation based on an optical transmission matrix indicates that the wavelength-tuning range of 93 nm can be realized for the polarization-independent wavelength-tunable VCSEL.