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Optical Engineering • Open Access

Orthogonal on–off keying for free-space laser communications with ambient light cancellation
Author(s): Saleh M. Faruque; Shams Faruque; William H. Semke

Paper Abstract

Orthogonal on–off keying (O 3 K ) is a coded modulation technique, where the input digital signal is mapped into a block of orthogonal codes. The encoded data, which is in orthogonal space, modulates the laser beam by means of O 3 K . At the receiver, two photocells are cross coupled to compensate for the sunlight and other atmospheric noise. Since the laser beam is highly directional and can only be acquired by one photocell, the input laser signal can then be received with little noise, and signal processing is made easier. These techniques are especially beneficial in high bandwidth, long distance secure laser communication applications, such as for use in unmanned aerial vehicles.

Paper Details

Date Published: 25 September 2013
PDF: 7 pages
Opt. Eng. 52(9) 096113 doi: 10.1117/1.OE.52.9.096113
Published in: Optical Engineering Volume 52, Issue 9
Show Author Affiliations
Saleh M. Faruque, The Univ. of North Dakota (United States)
Shams Faruque, The Univ. of North Dakota (United States)
William H. Semke, The Univ. of North Dakota (United States)

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