Abstract: Optical space communication is the best way to overcome the bottle-neck in the high speed communication between low earth orbit (LEO) and geostationary earth orbit (GEO) satellites. The key techniques and difficulties in optical space communication are high date rates and high power lamphouse technology. Two schemes are proposed for the communication, one using 1 550 nm band and the other taking 800 nm band. It is suggested that the scheme using 1 550 nm band be preferable with the available technologies.