A coherent CO(2) laser communication system that yields high-quality voice communications between a transmit-receive station and a remote site (24 km) where modulable retroreflectors are located was developed. The potential range capability of this system was 80 km, and the system was improved by 20 dB in the signal-to-noise ratio over a direct-detection system.
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Olson et al. (1995) studied this question.
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