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Title:
MULTI-CORE FIBER AND METHOD OF POSITIONING OF CORE OF MULTI-CORE FIBER
Document Type and Number:
WIPO Patent Application WO/2013/027776
Kind Code:
A1
Abstract:
Provided is a multi-core fiber in which a plurality of unitary mode cores are housed in a single optical fiber. The plurality of cores comprises a plurality of different types of cores with different propagation constants. The plurality of different types of cores further comprises core parts and a cladding part which covers the exterior circumferences of the core parts. The cladding part further comprises a two-stage cladding structure of a first cladding which surrounds the exterior circumference of each core part, and a second cladding of the exterior side of the first cladding. An optoelectromagnetic distribution which each core part and the first cladding has among the plurality of different types of cores is closed within the range of the each core part and the first cladding, the exudation thereof to the second cladding is limited, and the propagation constant of each different type of core differs with the refraction of the first cladding as a parameter. With this configuration, when core density is increased by a plurality of cores of different types being added, the spread of the range of specific refractivity Δ among cores of different types is alleviated, and increases in the differences of propagation characteristics of each core are also alleviated.

Inventors:
KOKUBUN YASUO (JP)
WATANABE TATSUHIKO (JP)
Application Number:
PCT/JP2012/071216
Publication Date:
February 28, 2013
Filing Date:
August 22, 2012
Export Citation:
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Assignee:
NAT UNIV CORP YOKOHAMA NAT UNI (JP)
KOKUBUN YASUO (JP)
WATANABE TATSUHIKO (JP)
International Classes:
G02B6/04; G02B6/02; G02B6/036
Domestic Patent References:
WO2010038863A12010-04-08
WO2010082656A12010-07-22
Foreign References:
JP2004252401A2004-09-09
JPS6110036A1986-01-17
Other References:
See also references of EP 2749919A4
Attorney, Agent or Firm:
SHIONOIRI, Akio (JP)
Akio Shionoiri (JP)
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Claims: