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Proceedings Paper

Performance of free space optical communication systems using polarization shift keying modulation
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Paper Abstract

Modulation of the polarization state provides a means for information transfer in an optical communication channel. Polarization shift keying (POLSK) has been proposed as a candidate for modulation in optical fiber communications and shown to have 3dB better sensitivity than an on-off keying (OOK). Unfortunately, the utility of POLSK in standard fibers is reduced because of birefringence of the fibers. The polarization state changes unpredictably and becomes difficult to track at the receiver. On the other hand, POLSK does not suffer from these problems in free space optical (FSO) communication systems. In theory, the atmospheric turbulence channel causes minimal depolarization, and negligible crosstalk occurs between orthogonal polarization states along the transmission path. The polarization state of a propagating optical wave is well preserved over link lengths up to several kilometers, which makes polarization state reliably detectable at the receiver. In this paper, the experimental performance of a POLSK modulation scheme used in our 1km FSO communication system test-bed is described and its theoretical analysis is also presented.

Paper Details

Date Published: 1 September 2006
PDF: 9 pages
Proc. SPIE 6304, Free-Space Laser Communications VI, 63040V (1 September 2006); doi: 10.1117/12.679670
Show Author Affiliations
Sugianto Trisno, Univ. of Maryland, College Park (United States)
Christopher C. Davis, Univ. of Maryland, College Park (United States)

Published in SPIE Proceedings Vol. 6304:
Free-Space Laser Communications VI
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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