多量子阱器件性能及在光通信领域的研究

We use nondegenerate four-wave mixing to study the spatial resolution of photorefractive semi-insulating multiple quantum wells optical addressing spatial light modulator. The spatial resolution of the photorefractive semi-insulating multiple quantum wells optical addressing spatial light modulator made by our material is up to 2.5μm, which approaches the theoretical limit of 2.38μm. It is about equal to the level reported abroad and the best domestic.We study systemically the characters of photorefractive semi-insulating multiple quantum wells device. We investigate the relationship between the read beam, write beam intensity and diffraction efficiency of longitudinal-field multiple-quantum-well photorefractive device. An optimum beam intensity is given. We also explain the mechanisms of the beam intensity effect on the diffraction efficiency of longitudinal-field multiple-quantum-well photorefractive device. Some advice on how to improve the diffraction efficiency is given.Compared with RF communication, Optical wireless communication has the advantage of high data rate, huge capacity, small volume, light weight and low power. It becomes more and more popular in satellite communication system. However, in terrestrial optical wireless communication including optical communication between satellite and ground station, the scheme adopting heterodyne reception is not common at all because of the interference such as wavefront distortion, random vibration of polarization and Doppler frequency shift induced by turbulent atmosphere channel. In this paper, a new coherent reception optical wireless communication adopting photorefractive multiple quantum device is discussed. The complicated intermediate frequency tracking electronics can be omitted in this system and this new scheme is also insensitive to the above-mentioned problems in turbulent atmosphere. It has more advantages than traditional heterodyne reception. The research lays the foundations of terrestrial optical communication adopting heterodyne reception.

进行多量子阱器件（MQW）特性（响应时间、灵敏度、衍射效率）研究；并探讨采用MQW的新型差拍接收方案，该方案有外差优点，且剩去繁琐的中频跟踪电子系统；利用该方案开展抑制波面奇变、多普勒频移及太阳背景光的研究。以期对空间急卫星光通信中困扰外差方案的诸多问题取得进展。采用MQW的新型差拍方案未见国外报导，利用该方案所进行的研究属创卵芯俊