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Title:
OPTICAL AMPLIFIER, OPTICAL AMPLIFIER EQUALIZING METHOD, AND TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/137820
Kind Code:
A1
Abstract:
Provided are an optical amplifier, an optical amplifier equalizing method, and a transmission system with which it is possible to achieve, when amplifying an optical signal to be transmitted, high electric power utilization efficiency by reducing gain variations between wavelengths and lowering an attenuation demand level. The optical amplifier, which amplifies wavelength multiplexed signal light, comprises: a multi-core optical fiber which includes cladding and a first core and a second core disposed in the cladding, and which is doped with rare-earth ions; an excitation light source for supplying excitation light to the cladding of the multi-core optical fiber; and a wavelength demultiplexing means for separating the wavelength bands of the wavelength multiplexed signal light that has propagated through the first core. The signal light of a relatively long wavelength band among a plurality of wavelength bands separated by the wavelength demultiplexing means is caused to propagate through the second core, and is then multiplexed with the signal light of a relatively short wavelength band among the plurality of wavelength bands separated by the wavelength demultiplexing means, and the resultant multiplexed signal light is output.

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Inventors:
MATSUMOTO KEIICHI (JP)
LE TAILLANDIER DE GABORY EMMANUEL (JP)
YANAGIMACHI SHIGEYUKI (JP)
Application Number:
PCT/JP2019/049875
Publication Date:
July 02, 2020
Filing Date:
December 19, 2019
Export Citation:
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Assignee:
NEC CORP (JP)
International Classes:
H04J14/02; H01S3/067; H01S3/10; H04B10/294
Domestic Patent References:
WO2018097075A12018-05-31
WO2018135621A12018-07-26
Foreign References:
JP2006012979A2006-01-12
JP2002341390A2002-11-27
JPH08248455A1996-09-27
Attorney, Agent or Firm:
SHIMOSAKA Naoki (JP)
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