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1 September 2006 Performance of free space optical communication systems using polarization shift keying modulation
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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.
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Sugianto Trisno and Christopher C. Davis "Performance of free space optical communication systems using polarization shift keying modulation", Proc. SPIE 6304, Free-Space Laser Communications VI, 63040V (1 September 2006);

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