title: Condition for Gaussian Schell-model beam to maintain the state of polarization on the propagation in free space.
abstract: In the free space optical communication system with circle polarization shift keying (CPolSK) modulation, the changes of polarization state of light beam have significant influence on the system performance. Keeping the state of polarization (SOP) unchanged on propagation can reduce the bit error rate. Based on the unified theory of coherence and polarization, we derive the sufficient condition for Gaussian Schell-model (GSM) beam to keep the SOP unchanged. We found that when the three spectral correlation widths (delta(xx), delta(yy) and delta(xy)) equal to each other and sigma(x) = sigma(y), the GSM beam maintains the SOP on propagation. This conclusion can be helpful for the design of the transmitter in the CPolSK system.
authors.affiliation: Laser Information Technology Research Center, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Xinhui
authors.initials: X
authors.lastname: Zhao
authors.forename: Yong
authors.initials: Y
authors.lastname: Yao
authors.forename: Yunxu
authors.initials: Y
authors.lastname: Sun
authors.forename: Chao
authors.initials: C
authors.lastname: Liu
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D016011:Normal Distribution; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation