Gallagher N C
Appl Opt. 1976 Apr 1;15(4):882-5. doi: 10.1364/AO.15.000882.
The development of real-time coherent optical signal processors has increased the appeal of optical computing techniques in signal processing applications. A major limitation of these real-time systems is the. fact that the optical processing material is generally of a phase-only type. The result is that the spatial filters synthesized with these systems must be either phase-only filters or amplitude-only filters. The main concern of this paper is the application of optical feedback techniques to obtain simultaneous and independent amplitude and phase control of the light passing through the system. It is shown that optical feedback techniques may be employed with phase-only spatial filters to obtain this amplitude and phase control. The feedback system with phase-only filters is compared with other feedback systems that employ combinations of phase-only and amplitude-only filters; it is found that the phase-only system is substantially more flexible than the other two systems investigated.
实时相干光信号处理器的发展提高了光学计算技术在信号处理应用中的吸引力。这些实时系统的一个主要限制是，光学处理材料通常是仅相位型的。结果是，用这些系统合成的空间滤波器必须要么是仅相位滤波器，要么是仅幅度滤波器。本文的主要关注点是应用光学反馈技术来实现对通过系统的光的幅度和相位进行同时且独立的控制。结果表明，可以将光学反馈技术与仅相位空间滤波器一起使用来实现这种幅度和相位控制。将仅相位滤波器的反馈系统与其他采用仅相位和仅幅度滤波器组合的反馈系统进行了比较；发现仅相位系统比所研究的其他两个系统具有更大的灵活性。
