各向异性光反馈注入的垂直表面发射激光器的矢量偏振模转换机理

数值研究了各向异性光反馈注入的垂直表面发射激光器(VCSEL)的矢量偏振模转换机理，研究结果表明，首先，当注入电流接近阈值电流时，由VCSEL的外部参数和偏振器控制的光反馈注入量中各偏振模的能量决定VCSEL 输出的偏振态.其次，由偏振器控制的各向异性光反馈注入引起的VCSEL输出偏振态呈周期性变化.另外，当由偏振器控制的反馈注入量中的x^偏振和y^偏振模能量相当时, x^偏振模和y^偏振模之间竞争激烈，而激光器外部微小的扰动都会打破这两种偏振模竞争 关键词： 各向异性光反馈 垂直表面发射激光器 矢量偏振模

Vector polarization mode switch mechanism of the vertical-cavity surface-emitting laser with anisotropic optical feedback injection

Vector polarization mode switch mechanism of the vertical-cavity surface-emitting laser with anisotropic optical injection is numerically investigated. The results are as follows:First, when the injection current is near the threshold current, the polarization state of the VCSEL output is determined by the power of each polarization mode of the optical feedback injection,which is controlled by the external parameter of the VCSEL and the polarizer. Second, the polarization state of the VCSEL output induced by anisotropic optical feedback injection under the controll of polarizer changes periodically. Third, the x^-polarization mode competes drastically with the y^_polarization mode when the power of the x^-polarization of the feedback injection is equivalent to that of the y^_polarization, which induces slight external disturbance of the laser to break the balance of two competing polarization modes. So, on this condition, the polarization state is sensitive to the external parameter change. At last，the y^_polarization mode obtains enough big gain when the injection current is much higher above the threshold current. At this time, the output of the VCSEL is in steady y^_polarization mode. In other words, the polarization state of the VCSEL output is now independent of other parameters.