Endless polarization control systems for coherent optics
Endless polarization control systems for coherent optics
复制标题
DOI：
10.1109/50.4117
复制
发表时间：
1988-07
影响因子：
4.7
通讯作者：
R. Noé;H. Heidrich;D. Hoffmann
中科院分区：
文献类型：
--
作者：
R. Noé;H. Heidrich;D. Hoffmann
在相干光学系统或传感器中，必须保证叠加光束之间的偏振匹配。自动偏振控制系统的跟踪范围应该是无限的，也就是说，任何有限范围的延迟器的重置都应该不会造成显著的强度损失。描述了包括计算机作为反馈控制器的各种实验系统。它们包括三个固定本征模延迟器的最小配置，即双折射取向不能改变。这些延迟器是由光纤挤出器实现的。然而，包含多于最小元件数目的容错系统更适合于处理时变延迟器传递函数等。第四光纤挤压器允许非理想系统的损耗保持在仅0.07分贝。最后，首次描述了具有两个集成光延迟器的闭环系统。这些延迟器具有可变的本征模，即可调的双折射取向。优化过程有助于使设备行为理想化。该系统的强度损耗小于0.15分贝，不包括耦合和衰减。>；
In coherent optical systems or sensors, polarization matching between the superposed beams must be assured. The tracking range of automatic polarization control systems should be endless, i.e. any resets of finite range retarders, which transform the polarization, should cause no significant intensity losses. A variety of experimental systems including a computer as feedback controller are described. They include the minimum configuration of three fixed eigenmode retarders, i.e. the orientation of birefringence cannot be changed. These retarders are realized by fiber squeezers. Error-tolerant systems which contain more than the minimum number of elements, however, are better suited to cope with time variant retarder transfer functions, etc. A fourth fiber squeezer allows the losses of a nonideal systems to be kept to only 0.07 dB. Finally, for the first time, a closed loop system with two integrated optical retarders is described. These retarders have variable eigenmodes, i.e. adjustable birefringence orientation. An optimization procedure helps to idealize the device behavior. The system has less than 0.15 dB intensity losses, coupling and attenuation not included. >