Study On Optical Feedback System And Optical Affine Transform

Optical information processing has the advantage of high-speed parallel processing. Its processing speed is much faster than that of computer. but it has been restricted by current technology and precision of optical devices, so the system has high coherent noise, poor stability, adjustment difficulties and other shortcomings, which results in the slow development of information processing in high-precision optical technology over the past decades. In recent years a great breakthrough is possible for the emergence of new technology to achieve coherent optical information processing system. First, phase spatial light modulator with high precision and high-resolution made adjustable coherent light phase wavefront possible, thus can realize all-optical parallel negative feedback system. Second, the emergence of optical cross-connect for large cross-section optical fiber image bundle and MEMS technology can realize arbitrary affine transform in optics. Ultimately image iterated function system(IFS) can be obtained.First of all, according to the existing optical feedback system, the two-dimensional optical negative feedback was analyzed, and a basic optical negative feedback system is constructed. Secondly, two specific iterated function systems were discussed, and an optical iterated function system is a two-dimensional feedback system. Through all-optical realization of two-dimensional iterated function systems, this can improve anti-jamming capabilities and the computing speed. Thirdly, conventional optical affine transform is implemented, with the shortage of experimental adjustment difficulties, low accuracy, poor flexibility and stability. A method for optical affine transform based on optical fiber bundle and MEMS (Micro-Electromechanical Systems) optical cross-connect is proposed. An arbitrary optical affine transform is realized by making use of the switch property of MEMS combined with optical fiber bundle. The shortcomings of traditional methods can be overcome effectively by this way. Comparison of optical experiment results and simulation results proves the superiority of this method. With further development of the technology of large cross-section fiber-optic image bundles and MEMS optical cross-connect, parallel image processing system is expected to achieve breakthrough in speed, precision and stability, etc.Currently, the optical affine transform realized by the combination of optical cross-connection based on MEMS with optical fiber bundles has many problems such as the low resolution. As to discrete graphics, we can use lens group to achieve zoom which can improve the resolution, but it results in somewhat less flexibility. So the way to improve system resolution deserves studying to improve the precision system.