Title:
OPTICAL COMMUNICATION SYSTEM AND OPTICAL COMMUNICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/176578
Kind Code:
A1
Abstract:
This optical communication system, in which a station-side device and multiple subscriber-side devices are structured according to a bus network topology, comprises an optical amplification unit installed on a station side and a drop unit for branching an optical signal and excitation light, wherein the optical amplification unit comprises an amplifier for amplifying a downstream signal and an excitation light output unit for outputting to a communication path the excitation light for amplifying an upstream signal, and the drop unit changes the branching ratio according to the wavelength of the optical signal in such a manner that transmission loss of the excitation light for a main fiber is reduced.
Inventors:
IGARASHI RYO (JP)
FUJIWARA MASAMICHI (JP)
HARA KAZUTAKA (JP)
KANAI TAKUYA (JP)
KIMURA YASUTAKA (JP)
KAWAKITA ATSUKO (JP)
FUJIWARA MASAMICHI (JP)
HARA KAZUTAKA (JP)
KANAI TAKUYA (JP)
KIMURA YASUTAKA (JP)
KAWAKITA ATSUKO (JP)
Application Number:
PCT/JP2020/009025
Publication Date:
September 10, 2021
Filing Date:
March 04, 2020
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04J14/02; H04B10/278
Foreign References:
| JP2002176392A | 2002-06-21 | |||
| JPH0851402A | 1996-02-20 | |||
| JP2014530523A | 2014-11-17 | |||
| US20170272197A1 | 2017-09-21 |
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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