Title:
OPTICAL SPACE COMMUNICATION SYSTEM, OPTICAL RECEPTION DEVICE, OPTICAL RECEPTION METHOD, AND NONTEMPORARY COMPUTER-READABLE MEDIUM
Document Type and Number:
WIPO Patent Application WO/2019/198465
Kind Code:
A1
Abstract:
An optical reception terminal is provided with: multiple matrix-type filters (40, 41) which are provided for every multiple modes, and each perform polarized wave separation and equalization on a coherently received signal in a mode corresponding thereto; and two synthesis filters (50, 51) which are provided for every two polarized waves, and weight and then synthesize corresponding polarized wave signals among signals outputted from the multiple matrix-type filters (40, 41). Filter coefficients of the multiple matrix-type filters (40, 41) and weighting coefficients of the two synthesis filters (50, 51) are controlled such that, on the basis of deviations of both of two polarized wave signals synthesized by the two synthesis filters (50, 51) from desired states, the sum of the magnitudes of the deviations is minimized.
Inventors:
ARIKAWA MANABU (JP)
ITO TOSHIHARU (JP)
ITO TOSHIHARU (JP)
Application Number:
PCT/JP2019/012087
Publication Date:
October 17, 2019
Filing Date:
March 22, 2019
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04B10/118; H04B10/61; H04J11/00; H04J14/06
Foreign References:
| JP2016139977A | 2016-08-04 |
Other References:
ARIKAWA ET AL.: "Mitigation of fading caused by atmospheric turbulence with FMF coupling and maximum ratio combining used in 320-m free-space optical trasmission of 10 Gb/s BPSK", ECOC 2016, September 2016 (2016-09-01), XP055645610
GEISLER ET AL.: "Multi-aperture digital coherent combining for free-space optical communication receivers", OPTICS EXPRESS, vol. 24, no. 12, June 2016 (2016-06-01), pages 12661 - 12671, XP055645612
ARIKAWA ET AL.: "Evaluation of blind diversity combining of severely faded signals for high-speed free-space optical communication under atmospheric turbulence", ECOC 2017, September 2017 (2017-09-01), XP033336527
KIM ET AL.: "Electronic wavefront correction for PSK free-space optical communications", ELECTRONICS LETTERS, vol. 43, no. 20, October 2007 (2007-10-01), pages 1108 - 1109, XP006029788
GEISLER ET AL.: "Multi-aperture digital coherent combining for free-space optical communication receivers", OPTICS EXPRESS, vol. 24, no. 12, June 2016 (2016-06-01), pages 12661 - 12671, XP055645612
ARIKAWA ET AL.: "Evaluation of blind diversity combining of severely faded signals for high-speed free-space optical communication under atmospheric turbulence", ECOC 2017, September 2017 (2017-09-01), XP033336527
KIM ET AL.: "Electronic wavefront correction for PSK free-space optical communications", ELECTRONICS LETTERS, vol. 43, no. 20, October 2007 (2007-10-01), pages 1108 - 1109, XP006029788
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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