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应用Mueller矩阵的极分解,对半导体光放大器(SOA)的偏振旋转效应进行了精确的实验分析。SOA的Mueller矩阵可以分解为双折射M_R、偏振相关增益M_D、和去偏振M_Δ三项,其中M_R决定偏振旋转(PR)的角度θ,并可由公式θ=arccos[Tr(M_R)/2-1]计算。实验采用计算机控制的测量系统得到SOA的Mueller矩阵。分析结果表明,SOA的自发辐射会降低输入信号的偏振度;PR角只与输入波长成线性关系而与注入电流及输入光功率均为非线性关系。实验进一步研究了抽运探测方案中的光诱导偏振旋转(PPR)和交叉增益调制效应,发现输出光的PR角及光功率与控制光强度非线性相关,而且控制光大约为3.5 mW时即可产生正交偏振旋转。由此实现了一种光控的高速偏振开关,此开关响应时间小于300 ps,可用于Gb/s级的高速数据通信。
The polarization decomposition effect of semiconductor optical amplifier (SOA) is analyzed experimentally by using the pole decomposition of Mueller matrix. The Mueller matrix of SOA can be decomposed into birefringence M_R, polarization-dependent gain M_D and depolarization M_Δ, where M_R determines the angle θ of the polarization rotation (PR) and can be determined by the formula θ = arccos [Tr (M_R) / 2-1 ] Calculation. Experiments using computer-controlled measurement system to obtain SOA Mueller matrix. The results show that the spontaneous emission of SOA will reduce the polarization degree of the input signal. The PR angle is only linear with the input wavelength but not with the injected current and input optical power. The experiment also further studies the light induced polarization rotation (PPR) and cross-gain modulation effects in the pump detection scheme. It is found that the PR angle and the optical power of the output light are nonlinearly correlated with the control light intensity. When the control light is about 3.5 mW, Orthogonal polarization rotation is generated. This results in a light-controlled, high-speed polarization switch with response times of less than 300 ps for high-speed Gb / s data communications.