Free space laser communication systems are wireless data links through the atmosphere. They work only under clear line-of-sight conditions between each unit, but they eliminate the need of securing right of ways, buried cable installations and no government licensing is necessary. Free space laser communication systems can be quickly deployed since they are small and do not need any radio interference calculations. Additionally, no spectrum fees have to be paid.
A phase coherency controller is used based on gradient decent optimization for free space laser communication. The controller will be able to operate under a wide range of frequencies, ranging from 1MHz to 1 GHz. These requirements necessitate the use of heterojunction bipolar transistors.
This report gives a brief description about the principle of operation, applications and their advantages and disadvantages.
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