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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 23 — Dec. 1, 2011
  • pp: 4650–4652

Spatial bandwidth considerations for optical communication through a free space propagation link

Glenn A. Tyler  »View Author Affiliations


Optics Letters, Vol. 36, Issue 23, pp. 4650-4652 (2011)
http://dx.doi.org/10.1364/OL.36.004650


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Abstract

This Letter concentrates on the transverse limitations imposed by a finite aperture optical propagation link that supports free space optical communication. Here it is assumed that a series of states, which are the spatial component of the message, are sent through the communication channel. The spatial bandwidth of the propagation link expressed as bits per transmitted photon is computed as the product of the average link efficiency times the entropy of the link. To facilitate the evaluation, it is assumed that the transmitted states are minimum energy loss orbital angular momentum states expressed in the form of f nm ( r ) exp ( i m θ ) , where the radial function is controlled to ensure that, for each quantum number denoted by the values of n and m, the minimum energy loss is obtained. The results illustrate that the bandwidth in units of bits per transmitted photon is very nearly equal to log 2 ( N f 2 ) , where log 2 ( · ) denotes the logarithm in base 2 and the Fresnel number, N f = ( π / 4 ) D 1 D 2 / ( λ z ) , where D 1 is the diameter of the transmitting aperture, D 2 is the diameter of the receiving aperture, λ is the wavelength of the light used, and z is the propagation distance.

© 2011 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(260.1960) Physical optics : Diffraction theory
(270.5565) Quantum optics : Quantum communications
(270.5585) Quantum optics : Quantum information and processing
(070.7345) Fourier optics and signal processing : Wave propagation

ToC Category:
Quantum Optics

History
Original Manuscript: August 22, 2011
Manuscript Accepted: October 2, 2011
Published: November 30, 2011

Citation
Glenn A. Tyler, "Spatial bandwidth considerations for optical communication through a free space propagation link," Opt. Lett. 36, 4650-4652 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-23-4650

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