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5 September 2002 Semiconductor lasers for free-space communication
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Free space lasercomm technology is one of the key techlonogies for future space base establishments. High power semiconductor lasers are the most promising devices for free space communication. Semiconductor lasers at 800 and 1550nm band are good candidates with small size, low weight and high efficiency. Used as the optical source demans the wavelength suited for atmosphere low loss window super high- power output . narrow beamwidth and high-data-rate. One transmitter approach is to use erbium doped fiber amplifier (EDFA) to amplify the optical signal from a directly modulated 1550 nm DFB laser at 2.5GB/s. Recent progress of the semiconductor laser diodes for free space lasercomm is described in this paper. Studies on the spectrum and the noise of EDFA ,a rough comparision of laser communication schemes at different wavelength bands and key devices . technologies of proposed laser communication in this paper.
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GuiFen Chen and FuChang Yin "Semiconductor lasers for free-space communication", Proc. SPIE 4913, Semiconductor Lasers and Applications, (5 September 2002);

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