Optimized Coding and Protocols for Free-Space Optical Communications Links

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-08-M-0180
Agency Tracking Number: N081-072-0318
Amount: $69,999.00
Phase: Phase I
Program: SBIR
Awards Year: 2008
Solicitation Year: 2008
Solicitation Topic Code: N08-072
Solicitation Number: 2008.1
Small Business Information
2680 Bancroft Way, Berkeley, CA, 94704
DUNS: 120364380
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Michael Helmbrecht
 CEO & President
 (510) 849-2375
 michael.helmbrecht@irisao.com
Business Contact
 Michael Helmbrecht
Title: CEO & President
Phone: (510) 849-2375
Email: michael.helmbrecht@irisao.com
Research Institution
N/A
Abstract
High-speed laser communications in adverse maritime conditions are necessary to transfer large amounts of data needed for command-and-control, target selection, or other intelligence. Atmospheric turbulence causes scintillation, variation of signal strength, and an increase in the bit-error rate (BER). Obscurations such as debris or fog cause scattering and a decrease in the signal and the information it contains. Conventional adaptive optics can be used to mitigate some of the turbulence effects, but data rates still need to remain high. In collaboration with our partner, the University of North Carolina at Charlotte (UNCC), we have recently finished some theoretical developments and laboratory demonstrations that will provide a novel optimized coding for the optical communications beam. Our coding scheme is based upon modulating a beam with an optical vortex with different vortex “charge” applied to each pulse. The pulse is then detected and the optical charge is determined. We can vary the vortex charge and thereby code each pulse with various values to increase the final data rate. The vortices placed on the beam are known to maintain their charge as the beam propagates through atmospheric turbulence, around small particulates (dust), and even fog.

* Information listed above is at the time of submission. *

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