摘要
随着激光器技术和光电子器件技术的飞速发展,以及人们对通信距离、通信质量的要求的不断提高,光通信技术以其独特的优点,得到了越来越快的发展。半导体激光器作为空间光通信发射系统的通信光源,如何保证其高效、稳定、安全的工作,成为当前普遍关注的课题。半导体激光器是一种高功率密度并具有极高量子效率的器件,对于电冲击和工作温度变化的承受能力很差,微小的电流将导致光功率输出的极大变化和器件参数的变化,直接危及激光器的安全使用及整个通信系统的稳定工作。同时半导体激光器对温度很敏感,环境温度的波动不仅能引起供给电流的波动,还会使激光器的阈值电流、量子效率、输出波长和输出功率发生很大的变化。因而在实际应用中这就需要通过对激光器本身进行精密的检测和可靠的自动控制技术来完成。空间光通信发射系统中大功率、高可靠性的激光器是整个光通信系统的重中之重。
本论文对卫星与飞机间激光通信发射系统中使用的激光器的特点和工作方式进行了研究分析,制定并实施了设计方案。本论文选用的半导体激光器的工作模式有可控和不可控两种,其中可控模式主要是对激光器的温度和功率进行控制,以保证激光器的稳定工作。
With the rapid development of laser technology and photoelectron component technology, as well as the further requests about the distance and quality of communication, the optical communication technology is rapidly developed with unique merit. As semiconductor laser diode is the lamp-house of the spatial optical communication emission system, that how to guarantee its high-efficiency, steady, and safe working becomes an issue paid attention to currently. Semiconductor laser diode is a kind of device with high power density and sky-high quantum efficiency. Even weak drive current and temperature change will lead to its large change of output light power and device parameter, which directly damages the safe use of laser diode, even steady working of all communication system. At the same time, Semiconductor laser diode is very sensitive to the temperature not only leads to the fluctuation of supply current, but also makes threshold current, quantum efficiency, output wavelength and output light intensity of the laser diode change greatly. So, it is necessary to control the semiconductor laser diode by technology of detecting exactly and controlling automatically in practical application. The high power and high reliable laser is the most important part in the spatial optical communication emission system.
The thesis discusses and analyzes to the laser’s characteristics and modes. The laser has two kinds of modes. One is controlled mode, the other is uncontrolled mode. The controlled mode is to control current and temperature of laser for laser’s stability.
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