Orbital angular momentum receiver bandwidth for laser communications systems operating in atmospheric turbulence

Frida E. Strömqvist Vetelino; Ricky J. Morgan

doi:10.1117/12.883817

25 May 2011 Orbital angular momentum receiver bandwidth for laser communications systems operating in atmospheric turbulence

Frida E. Strömqvist Vetelino, Ricky J. Morgan

Author Affiliations +

Proceedings Volume 8038, Atmospheric Propagation VIII; 80380L (2011) https://doi.org/10.1117/12.883817
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

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.

Citation Download Citation

Frida E. Strömqvist Vetelino and 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); https://doi.org/10.1117/12.883817

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available