【作者】 赵春英；

【导师】 李洪祚；

【作者基本信息】 长春理工大学 ， 电子科学与技术， 2010， 硕士

【摘要】 在自由空间光通信中,相干光通信以其灵敏度高,中继距离长,通信容量大等优点,成为各国学者争相研究的热点,也成为未来空间光通信发展中极具潜力的选择。论文中研究的是外差接收方式,给出了外差异步解调接收方案,并对这一方案进行了仿真论证。同时重点研究了混频效率,针对信号光与本振光的振幅、高斯光束腰半径和探测器尺寸,空间失配角及波面弯曲对混频效率的影响进行了研究。论文的最后介绍了影响相干光通信的两大因素,即多普勒频移和振动。本文是对相干光通信的外差接收进行理论上的设计及计算,在今后的实际应用中,还需要对系统的各个环节做出大量详细的研究论证以及相关的可行性试验。更多还原

【Abstract】 In free space optical communications, Coherent optical communication have advantages of high sensitivity, long distance relay, large capacity of communication and so on. The technology has been the research hotspot by scholars from various countries, Also become the great potential choice in development of future space laser communication .This paper is the study of heterodyne receiver mode, Paper gives the demodulation of heterodyne asynchronous in the program receiver, and then simulated it. The paper also conducted a study of mixing efficiency, And did the simulations of the affects from signal light’s and LO optical’s amplitude、Gaussian beam waist radius and detector size、Space loss of supporting and wave area bending for mixing efficiency. At last, this paper described the impact of two factors in coherent optical communications: Doppler frequency shift and Vibration.this paper only did some work on primary design and calculations ,However, only do a lot of detailed demonstrations and some feasible trial, can this project realization come true.更多还原