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Wide-band laser communications in space

Forster, Donald C. and Goodwin, Frank E. and Bridges, William B. (1972) Wide-band laser communications in space. IEEE Journal of Quantum Electronics, 8 (2). pp. 263-272. ISSN 0018-9197. doi:10.1109/JQE.1972.1076929.

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Candidate wide-bandwidth (1-Gbit/s) satellite laser communications systems are compared on two different bases. First, a comparison is made with projected component technology to establish relative performance between the various approaches based on the fundamental system parameters. From this comparison it appears that the CO_2 (10.6-μm) system offers a signal-to-noise advantage over the Nd:YAG (1.06-μm) or doubled Nd:YAG (0.53-μm) system for a comparable satellite burden. Second, a comparison is made based upon the concept that launch cost for equivalent systems comprises an optimizing criterion. From this comparison it appears that the launch costs for the CO_2 and doubled Nd:YAG systems can be similar, but the latter is very sensitive to the projected weight of a large lightweight "photon bucket" receiving aperture. In general, the relative deficiency in signal-to-noise ratio for the Nd:YAG system can only be accommodated through adoption of an open-loop pointing system with an accuracy of 1 μrad or less, as compared to a closed-loop pointing system with relaxed accuracy for the CO_2 system. The most critical technology problem for the CO_2 system is that of Doppler compensation. These and other critical technologies for both approaches are listed and discussed.

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Additional Information:© 1972 IEEE. Manuscript received August 31, 1971; revised September 23, 1971.
Issue or Number:2
Record Number:CaltechAUTHORS:20190312-152310160
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Official Citation:D. Forster, F. Goodwin and W. Bridges, "Wide-band laser communications in space," in IEEE Journal of Quantum Electronics, vol. 8, no. 2, pp. 263-272, February 1972. doi: 10.1109/JQE.1972.1076929
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93746
Deposited By: Tony Diaz
Deposited On:12 Mar 2019 23:32
Last Modified:16 Nov 2021 17:00

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