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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 8948–8962

Synergy of adaptive thresholds and multiple transmitters in free-space optical communication

James A. Louthain and Jason D. Schmidt  »View Author Affiliations


Optics Express, Vol. 18, Issue 9, pp. 8948-8962 (2010)
http://dx.doi.org/10.1364/OE.18.008948


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Abstract

Laser propagation through extended turbulence causes severe beam spread and scintillation. Airborne laser communication systems require special considerations in size, complexity, power, and weight. Rather than using bulky, costly, adaptive optics systems, we reduce the variability of the received signal by integrating a two-transmitter system with an adaptive threshold receiver to average out the deleterious effects of turbulence. In contrast to adaptive optics approaches, systems employing multiple transmitters and adaptive thresholds exhibit performance improvements that are unaffected by turbulence strength. Simulations of this system with on-off-keying (OOK) showed that reducing the scintillation variations with multiple transmitters improves the performance of low-frequency adaptive threshold estimators by 1-3 dB. The combination of multiple transmitters and adaptive thresholding provided at least a 10 dB gain over implementing only transmitter pointing and receiver tilt correction for all three high-Rytov number scenarios. The scenario with a spherical-wave Rytov number = 0.20 enjoyed a 13 dB reduction in the required SNR for BER’s between 10−5 to 10−3, consistent with the code gain metric. All five scenarios between 0.06 and 0.20 Rytov number improved to within 3 dB of the SNR of the lowest Rytov number scenario.

© 2010 OSA

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(060.4510) Fiber optics and optical communications : Optical communications
(060.2605) Fiber optics and optical communications : Free-space optical communication
(070.7345) Fourier optics and signal processing : Wave propagation

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: February 18, 2010
Revised Manuscript: March 29, 2010
Manuscript Accepted: April 7, 2010
Published: April 14, 2010

Citation
James A. Louthain and Jason D. Schmidt, "Synergy of adaptive thresholds and multiple transmitters in free-space optical communication," Opt. Express 18, 8948-8962 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-9-8948


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References

  1. Staff Writers, “Northrop Grumman Awarded DARPA Contract To Design Hybrid Optical/RF Communications Network,” Spacedaily.com (2008). Dated 5 May 2008, URL http://www.spacedaily.com/reports/Northrop Grumman Awarded DARPA Contract To Design Hybrid Optical RF Communications Network 999.html.
  2. R. K. Tyson, J. S. Tharp, and D. E. Canning, “Measurement of the bit-error rate of an adaptive optics, free-space laser communications system, part 2: multichannel configuration, aberration characterization, and closed-loop results,” Opt. Eng. 44(9), (2005).
  3. A. Belmonte, “Influence of atmospheric phase compensation on optical heterodyne power measurements,” Opt. Express 16(9), 6756–6767 (2008). URL http://www.opticsexpress.org/abstract.cfm?URI=oe-16-9-6756
  4. R. K. Tyson, “Adaptive optics and ground-to-space laser communications,” Appl. Opt. 35(19), 3640 (1996). [CrossRef] [PubMed]
  5. S. M. Haas and J. H. Shapiro, “Capacity of Wireless Optical Communications,” IEEE J. Sel. Areas Comm. 21(8), 1346–1357 (2003). [CrossRef]
  6. E. J. Lee and V. W. S. Chan, “Part 1: Optical Communication Over the Clear Turbulent Atmospheric Channel Using Diversity,” IEEE J. Sel. Areas Comm. 22(9), 1896–1906 (2004). [CrossRef]
  7. P. Polynkin, A. Peleg, L. Klein, T. Rhoadarmer, and J. Moloney, “Optimized multiemitter beams for free-space optical communications through turbulent atmosphere,” Opt. Lett. 32(8), 885–887 (2007). [CrossRef] [PubMed]
  8. J. A. Louthain, and J. D. Schmidt, “Anisoplanatism in airborne laser communication,” Opt. Express 16(14), 10,769–10,785 (2008). URL http://www.opticsexpress.org/abstract.cfm?URI=oe-16-14-10769 .
  9. R. J. Sasiela, Electromagnetic wave propagation in turbulence. Evaluation and application of Mellin transforms, 2nd Ed. (SPIE Publications, 2007).
  10. J. A. Louthain, and J. D. Schmidt, “Anisoplanatic Approach to Airborne Laser Communication,” Meeting of the Military Sensing Symposia (MSS) Specialty Group on Active E-O Systems I(AD02), 1–20 (2007).
  11. D. L. Fried, “Anisoplanatism in adaptive optics,” J. Opt. Soc. Am. A 72(1), 52–61 (1982). [CrossRef]
  12. L. C. Andrews, and R. L. Phillips, Laser Beam Propagation Through Random Media (SPIE Optical Engineering Press Bellingham, WA, 2005).
  13. J. A. Anguita, M. A. Neifeld, and B. V. Vasic, “Spatial correlation and irradiance statistics in a multiple-beam terrestrial free-space optical communication link,” Appl. Opt. 46(26), 6561–6571 (2007). [CrossRef] [PubMed]
  14. M. C. Roggemann, and B. M. Welsh, Imaging Through Turbulence (CRC Press, 1996).
  15. H. L. VanTrees, Detection, estimation, and modulation theory (Wiley, 2002).
  16. H. Burris, A. Reed, N. Namazi, W. Scharpf, M. Vicheck, M. Stell, and M. Suite, “Adaptive thresholding for free-space optical communication receivers with multiplicative noise,” in Proc. IEEE Aerospace Conference, vol. 3, pp. 1473–1480 (2002).
  17. P. N. Crabtree, Dissertation:Performance-Metric Driven Atmospheric Compensation for Robust Free-Space Laser Communication (Air Force Institute of Technology, Wright-Patterson AFB, OH, 2006).
  18. S. B. Alexander, Optical Communication Receiver Design, SPIE Tutorial Texts in Optical Engineering, vol. TT22; IEE Telecommunications Series, vol. 37 (SPIE Press, Bellingham, WA, 1997).
  19. J. D. Schmidt, Dissertation: Free-Space Optical Communications Performance Enhancement by Use of a Single Adaptive Optics Correcting Element (University of Dayton, Dayton, OH, 2006).
  20. H. Burris, A. Reed, N. Namazi, M. Vilcheck, and M. Ferraro, “Use of Kalman filtering in data detection in optical communication systems with multiplicative noise,” in Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP ’01), vol. 4, pp. 2685–2688 (7–11 May 2001).
  21. B. M. Welsh, “Fourier-series-based atmospheric phase screen generator for simulating anisoplanatic geometries and temporal evolution,” Proc. SPIE 3125, 327 (1997). [CrossRef]
  22. J. A. Louthain and B. M. Welsh, “Fourier-series-based phase and amplitude optical field screen generator for weak atmospheric turbulence,” Proc. SPIE 3381, 286–296 (1998). [CrossRef]
  23. S. Coy, “Choosing Mesh Spacings and Mesh Dimensions for Wave Optics Simulation,” Proc. SPIE 5894 (2005).
  24. J. A. Louthain, Dissertation: Integrated approach to airborne laser communication, Air Force Institute of Technology, Wright-Patterson AFB, OH, December 2008.
  25. J. A. Buck, Fundamentals of Optical Fibers, Wiley-Interscience, 2004.
  26. J. A. Louthain and J. D. Schmidt, “Integrated approach to airborne laser communication,” Proc. SPIE 7108(14), (2008). [CrossRef]
  27. J. D. Schmidt, and J. A. Louthain, “Integrated approach to free-space optical communication,” in Proc. SPIE, Optics in Atmospheric Propagation and Adaptive Systems XI, vol. 7200 (SPIE Press, Bellingham, WA, 2009).

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