Orthogonal on–off keying for free-space laser communications with ambient light cancellation

Saleh M. Faruque; Shams Faruque; William H. Semke

doi:10.1117/1.OE.52.9.096113

25 September 2013 Orthogonal on–off keying for free-space laser communications with ambient light cancellation

Saleh M. Faruque, Shams Faruque, William H. Semke

Author Affiliations +

Optical Engineering, Vol. 52, Issue 9, 096113 (September 2013). https://doi.org/10.1117/1.OE.52.9.096113

Abstract

Orthogonal on–off keying (O ³K ) 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.

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Saleh M. Faruque, Shams Faruque, and William H. Semke "Orthogonal on–off keying for free-space laser communications with ambient light cancellation," Optical Engineering 52(9), 096113 (25 September 2013). https://doi.org/10.1117/1.OE.52.9.096113

Published: 25 September 2013

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KEYWORDS

Receivers

Modulation

Free space optical communications

Laser communications

Optical filters

Signal to noise ratio

Telecommunications

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CHORUS Article. This article was made freely available starting 25 September 2014

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