极化测量 极化效应对光信号的影响主要是改变E场分量的相对幅度和相位。之所以会发生这种情况,是由于光信号的极化与光部件及系统的极化传输特性之间相互作用的结果。 在有些情况下,极化效应能改善设备和系统的性能,例如光定向耦合器和光隔离器就是利用极化效应,避免了反射光信号对前向传输的干扰。但在另外一些情况下,极化效应是有害的,必须设法降至最低的限度,以保证系统的性能。例如,在长途电信系统中,极化 Polarization measurements The effect of polarization on the optical signal is mainly to change the relative amplitude and phase of the E-field components. This happens because of the interaction between the polarization of the optical signal and the polarization transmission characteristics of the optical components and the system. In some cases, the polarization effect can improve the performance of the device and the system. For example, the optical directional coupler and the optical isolator use the polarization effect to avoid the interference of the reflected optical signal to the forward transmission. In other cases, however, polarization effects are detrimental and must be minimized to ensure system performance. For example, in long-haul telecommunications systems, polarization