Wavelength selection criteria for laser communications

Laser communication systems can be based on a wide range of wavelengths in the optical and infrared regimes. This article provides a rationale for the selection of wavelengths particularly suited for free space laser communication systems. The choice of wavelengths is based on an analysis of propagation issues, especially through the atmosphere, optical background noise, and the necessary technologies that include lasers, detectors, and spectral filters. The maturity of technology is assessed and given due consideration to identify suitable wavelengths for today's laser communication systems. Figures of merit are also developed where useful to provide a comparative estimate of expected system performance as a function of wavelength.

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