Title:
OPTICAL REPEATER, TRANSMISSION PATH FIBER MONITORING METHOD, AND OPTICAL TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/168099
Kind Code:
A1
Abstract:
Provided are an optical repeater with which it is possible to perform OTDR measurement and diagnose, according thereto, the state of a transmission path fiber and the state of the optical repeater while suppressing an increase in insertion losses of a main signal, and an optical transmission system. The optical repeater is a C+L-band repeater inserted between a first transmission path fiber and a second transmission path fiber. The optical repeater includes: a first optical fiber amplifier inserted in a first line, for amplifying a C-band signal; a second optical fiber amplifier inserted in a second line, for amplifying an L-band signal; a third optical fiber amplifier inserted in a third line, for amplifying a C-band signal; a fourth optical fiber amplifier inserted in a fourth line, for amplifying an L-band signal; and a first loopback means provided between an input to the first optical fiber amplifier or an output from the first optical fiber amplifier and an input to the third optical fiber amplifier or an output from the third optical fiber amplifier.
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Inventors:
KATAOKA HIROAKI (JP)
Application Number:
PCT/JP2019/007814
Publication Date:
September 06, 2019
Filing Date:
February 28, 2019
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04B10/071; H01S3/067; H01S3/10; H04B10/291
Domestic Patent References:
| WO2017170004A1 | 2017-10-05 |
Foreign References:
| JP2007060665A | 2007-03-08 | |||
| JP2003134089A | 2003-05-09 | |||
| JP2001044546A | 2001-02-16 | |||
| JPH09116502A | 1997-05-02 | |||
| JP2018037453A | 2018-03-08 |
Other References:
See also references of EP 3761527A4
Attorney, Agent or Firm:
SHIMOSAKA Naoki (JP)
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