Optical communications – Optical communication over freee space – Compensation
Reexamination Certificate
2006-09-05
2009-10-13
Sedighian, M. R. (Department: 2613)
Optical communications
Optical communication over freee space
Compensation
C398S118000, C398S128000, C398S130000
Reexamination Certificate
active
07603038
ABSTRACT:
A high-speed (Gbps), free space optical communication system is based on spectral encoding of radiation from a wide band light source, such as a laser. By using partially coherent laser beams in combination with a relatively slow photosensor, scintillations can be suppressed by orders of magnitude for distances of more than 10 km. To suppress the intensity fluctuations due to atmospheric turbulence, a source with partial transverse coherence in combination with slow response time photodetector is used. Information is encoded in the spectral domain of a wideband optical source by modulation of spectral amplitudes. A non-coherent light source with wide spectrum (an LED, for example) may be used for high-speed communication over short (less than about a mile) distances.
REFERENCES:
patent: 4054794 (1977-10-01), Laughlin et al.
patent: 6501578 (2002-12-01), Bernstein et al.
patent: 7266257 (2007-09-01), Chowdhury et al.
patent: 2005/0196170 (2005-09-01), Winsor
patent: 2006/0233554 (2006-10-01), Ramachandran et al.
Pan et al., “Free-Space Optical Communications: Opportunities and Challenges, a Carrier's Perspective,” Proc. SPIE, vol. 4911, Oct. 2002, pp. 58-72.
Belen'kii et al., “Free-Space Laser Communication Model,” Proc. SPIE, vol. 5595, Oct. 2004, pp. 167-184.
Ricklin et al, “Atmospheric Optical Communication with a Gaussian Schell Beam,” J. Opt. Soc. Am. A. vol. 20, No. 5, May 2003, pp. 856-866.
Korotkova et al, “Model for a Partially Coherent Gaussian Beam in Atmospheric Turbulence with Application in Lasercom,” Opt. Eng., vol. 43, No. 2, Feb. 2004, pp. 330-341.
Voelz et al, “Pseudo-Partially Coherent Beam for Free-Space Laser Communication,” Proc. SPIE, vol. 5550, Aug. 2004, pp. 218-224.
Ahearn et al, “Multiple Quantum Well (MQW) Spatial Light Modulators (SLM) for Optical Data Processing and Beam Steering,” Proc. SPIE, vol. 4457, Aug. 2001, pp. 43-53.
Adam et al., “Experimental Optical CDMA System Based on Spectral Amplitude Encoding of Noncoherent Broadband Sources,” Proc. SPIE, vol. 2614, Oct. 1995, pp. 122-132.
Yakushkin, “Strong Intensity Fluctuations in the Field of a Light Beam in a Turbulent Atmosphere,” Radiophys Quantum Electron, vol. 19, No. 3, Mar. 1976, pp. 270-276.
Fante, “Electromagnetic Beam Propagation in Turbulent Media,” Proc. of IEEE, vol. 63, No. 12, Dec. 1975, pp. 1669-1692.
Berman et al., “Photon Distribution Function for Long-Distance Propagation of Partially Coherent Beams Through the Turbulent Atmosphere,” Physical Review A, vol. 74, 2006, pp. 13805-13811.
Berman Gennady P.
Bishop Alan R.
Chernobrod Boris M.
Gorshkov Vacheslav N.
Nguyen Dinh C.
Borkowsky Samuel L.
Los Alamos National Security LLC
Sedighian M. R.
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