Title:
広い光ビーコン信号および狭い光ビーコン信号を同時に送信するための技術
Document Type and Number:
Japanese Patent JP5802425
Kind Code:
B2
Abstract:
A technique for simultaneously transmitting wide and narrow optical beacon signals includes generating a laser beam and splitting the laser beam into a first signal on a first path and a second signal on a second path via a wavelength-dependent beamsplitter. A wide beacon signal having a first beam divergence is generated from the first signal, and a narrow beacon signal having a second, lesser beam divergence is generated from the second signal. The wavelength of the laser beam determines an allocation of the laser energy between the wide and narrow beacon signals based on transmittance/reflectance characteristic of the beamsplitter at that wavelength. The wide and narrow beacon signals are simultaneously transmitted in a overlaid manner into free space to support acquisition and tracking in a free-space optical communication system. The beamsplitter can simultaneously transmit or reflect substantially all of a data signal at a different wavelength.
Inventors:
James A. Cunningham
David Earl. Wickholm
Dean S. Grinch
Daniel El. Baber
David Earl. Wickholm
Dean S. Grinch
Daniel El. Baber
Application Number:
JP2011097665A
Publication Date:
October 28, 2015
Filing Date:
April 25, 2011
Export Citation:
Assignee:
Excelis Incorporated
International Classes:
H04B10/112; H01S5/022; H01S5/06; H04B10/118; H04J14/00; H04J14/02
Domestic Patent References:
| JP2007043611A | ||||
| JP2000244408A |
Foreign References:
| US20030142983 | ||||
| US6347001 |
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita