25 May 2011 Orbital angular momentum receiver bandwidth for laser communications systems operating in atmospheric turbulence
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Abstract
The Orbital Angular Momentum (OAM) states of photons in paraxial beams allow, in theory, an unlimited number of bits per photon to be used for information encoding in lasercom systems. Atmospheric turbulence scatters the transmitted OAM mode to neighboring modes. The probability of receiving the transmitted mode number decreases with increasing turbulence strength. The degradation is more severe for larger transmitted mode numbers due to their bigger spot size, limiting the range of an OAM encoded lasercom system. To compensate for the lower probability of receiving higher order modes, the concept of receiver OAM bandwidth is defined as a range of received neighboring OAM states allocated to the transmitted OAM mode. By increasing the receiver OAM bandwidth for higher order transmitted modes, the probability to determine the transmitted mode number is similar for all transmitted mode numbers. The optimal system design for OAM encoding using higher order Laguerre-Gauss beams, with the suggested transmitted mode numbers and their corresponding receiver OAM bandwidth, is presented. A closed form analytical expression of the probability to determine the transmitted mode number of the system design is developed. It can be used to easily determine the maximum propagation distance for an OAM encoded lasercom system with a probability to determine the transmitted OAM mode number close to unity.
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Frida E. Strömqvist Vetelino, Frida E. Strömqvist Vetelino, Ricky J. Morgan, Ricky J. Morgan, "Orbital angular momentum receiver bandwidth for laser communications systems operating in atmospheric turbulence", Proc. SPIE 8038, Atmospheric Propagation VIII, 80380L (25 May 2011); doi: 10.1117/12.883817; https://doi.org/10.1117/12.883817
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