19 March 2013 Nonlinearity mitigation of a 40-Watt 1.55-micron uplink transmitter for lunar laser communications
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Abstract
Improvements to a ground-based 40W 1.55 micron uplink transmitter for the Lunar Laser Communications Demonstration (LLCD) are described. The transmitter utilizes four 10 W spatial-diversity channels to broadcast 19.4 - 38.9 Mbit/s rates using a variable-duty cycle 4-ary pulse position modulation. At the lowest rate, with a 32-to-1 duty cycle, this leads to 320 W peak power per transmitter channel. This paper discusses a simplification of the transmitter that uses super-large-area single mode fiber and polarization control to mitigate high peak power nonlinear impairments.
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R. T. Schulein, R. E. Lafon, M. B. Taylor, P. A. MacKoul, J. J. Carney, M. L. Stevens, B. S. Robinson, S. Constantine, M. M. Willis, D. W. Peckham, B. Zhu, J. M. Fini, David O. Caplan, "Nonlinearity mitigation of a 40-Watt 1.55-micron uplink transmitter for lunar laser communications", Proc. SPIE 8610, Free-Space Laser Communication and Atmospheric Propagation XXV, 86100F (19 March 2013); doi: 10.1117/12.2010025; https://doi.org/10.1117/12.2010025
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