Title:
FREE SPACE OPTICAL COMMUNICATION SYSTEM, APPARATUS AND A METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2017/009808
Kind Code:
A3
Abstract:
The present invention provides a free space optical communication system that uses orthogonal modes of aberration in a laser beam as means for encoding the information. The system comprises a transmission station which transmits the user defined information in terms of the amplitudes of certain orthogonal aberration modes present in the transmitted beam. The beam then travels through free space before it reaches the receiving station. The receiving station comprises a high speed wavefront sensor of light beams. The wavefront sensor measures the amplitudes of various orthogonal aberration modes present in the incident beam at different instants of time. The amplitudes of the orthogonal modes at a certain regular time interval are then used to extract the user information.
Inventors:
BORUAH BOSANTA RANJAN (IN)
KONWAR SANTANU (IN)
KONWAR SANTANU (IN)
Application Number:
PCT/IB2016/054233
Publication Date:
March 09, 2017
Filing Date:
July 15, 2016
Export Citation:
Assignee:
THE SECRETARY DEPT OF ELECTRONICS AND INFORMATION TECH (DEITY) (IN)
INDIAN INST OF TECH GUWAHATI (IN)
INDIAN INST OF TECH GUWAHATI (IN)
International Classes:
G11B7/00
Foreign References:
| US7343099B2 | 2008-03-11 | |||
| US5120128A | 1992-06-09 | |||
| CN102288305A | 2011-12-21 |
Other References:
GIBSON ET AL.: "Free-space information transfer using light beams carrying orbital angular momentum", OPTICS EXPRESS, vol. 12, no. 22, 2004, pages 5448 - 5456, XP002500773
FENG FENG ET AL.: "Free Space Communications With Beam Steering a Two-Electrode Tapered Laser Diode Using Liquid-Crystal SLM", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 31, no. 12, 2013, pages 2001 - 2007, XP011510749
HAO HUANG ET AL.: "100Tbit/s free-space data link enabled by three-dimensional multiplexing of orbital angular momentum, polarization, and wavelength", OPTICS LETTERS, vol. 39, no. 2, 2014, pages 197 - 200, XP001587215
FENG FENG ET AL.: "Free Space Communications With Beam Steering a Two-Electrode Tapered Laser Diode Using Liquid-Crystal SLM", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 31, no. 12, 2013, pages 2001 - 2007, XP011510749
HAO HUANG ET AL.: "100Tbit/s free-space data link enabled by three-dimensional multiplexing of orbital angular momentum, polarization, and wavelength", OPTICS LETTERS, vol. 39, no. 2, 2014, pages 197 - 200, XP001587215
Attorney, Agent or Firm:
MAJUMDAR, Subhatosh et al. (IN)
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