The design approaches of active alignment and optical systems for free-space optics

The design proposals of active alignment system suitable for different transmission ranges are presented. Influence of light power distribution on the focal plane of the receiver on complexity of a alignment system is analyzed, The optical system of the lasercom system is not used in imaging, but transmitting signals, and so the optical design method of the suitable power distribution of the light spot on the focal plane of the receiver should be adopted in the design of whole optical system from transmitter to receiver in order to reduce the bad influence due to the spot shifting on signal transmitting.