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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 15 — Jul. 18, 2011
  • pp: 14277–14289

Deep-space and near-Earth optical communications by coded orbital angular momentum (OAM) modulation

Ivan B. Djordjevic  »View Author Affiliations

Optics Express, Vol. 19, Issue 15, pp. 14277-14289 (2011)

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In order to achieve multi-gigabit transmission (projected for 2020) for the use in interplanetary communications, the usage of large number of time slots in pulse-position modulation (PPM), typically used in deep-space applications, is needed, which imposes stringent requirements on system design and implementation. As an alternative satisfying high-bandwidth demands of future interplanetary communications, while keeping the system cost and power consumption reasonably low, in this paper, we describe the use of orbital angular momentum (OAM) as an additional degree of freedom. The OAM is associated with azimuthal phase of the complex electric field. Because OAM eigenstates are orthogonal the can be used as basis functions for N-dimensional signaling. The OAM modulation and multiplexing can, therefore, be used, in combination with other degrees of freedom, to solve the high-bandwidth requirements of future deep-space and near-Earth optical communications. The main challenge for OAM deep-space communication represents the link between a spacecraft probe and the Earth station because in the presence of atmospheric turbulence the orthogonality between OAM states is no longer preserved. We will show that in combination with LDPC codes, the OAM-based modulation schemes can operate even under strong atmospheric turbulence regime. In addition, the spectral efficiency of proposed scheme is N2/log2N times better than that of PPM.

© 2011 OSA

OCIS Codes
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(040.1880) Detectors : Detection
(060.4080) Fiber optics and optical communications : Modulation
(060.2605) Fiber optics and optical communications : Free-space optical communication
(120.6085) Instrumentation, measurement, and metrology : Space instrumentation

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: June 1, 2011
Revised Manuscript: June 27, 2011
Manuscript Accepted: June 29, 2011
Published: July 11, 2011

Ivan B. Djordjevic, "Deep-space and near-Earth optical communications by coded orbital angular momentum (OAM) modulation," Opt. Express 19, 14277-14289 (2011)

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