Comparison of Electrooptic Modulation Methods |
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Authors: | Hannan William J Bordogna Joseph |
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Institution: | RCA Laboratories, David Sarnoff Research Center, Princeton, N.J.; |
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Abstract: | A comparison is made among normal AM, wide-band analog FM, and PCM as applied to transmission of real-time TV pictures via an electrooptic space communication system. The comparison is based on the requirement to receive a subjectively noise-free TV picture. Based on the results of this comparison, it is concluded that analog-FM subcarrier modulation is the best practical choice for transmission of real-time TV pictures in space via a laser beam. In addition to providing performance equivalent to that of coherent PCM, this type of modulation can be implemented with comparatively simple equipment. |
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