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Title:
OPTICAL COUPLER AND OPTICAL AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2019/117314
Kind Code:
A1
Abstract:
In order to provide an optical coupler and an optical amplifier that contribute to the improvement of pumping efficiency in the optical amplifier, this optical coupler comprises: a main optical fiber comprising a core that propagates a signal light, an inside cladding section formed in the outer circumference of the core and having a lower refractive index than the core, and an outside cladding section formed on the outer circumference of the inside cladding section and having a lower refractive index than the inside cladding section, said main optical fiber having the outside cladding section removed in at least part thereof in the longitudinal direction; and at least one optical fiber for pumping light I/O, that is fusion-connected to the inside cladding section at a section of the main optical fiber having the outside cladding section removed, said at least one optical fiber for pumping light I/O having an average refractive index in a contact region in contact with the inside cladding section that is greater than the refractive index of the inside cladding section. The pumping light that propagates the optical fiber for pumping light I/O is coupled to the inside cladding section from the contact region and propagates the inside cladding section or pumping light that propagates the inside cladding section is coupled to the optical fiber for pumping light I/O from the contact region and propagates the optical fiber for pumping light I/O.

Inventors:
TAKASAKA SHIGEHIRO (JP)
MAEDA KOICHI (JP)
Application Number:
JP2018/046393
Publication Date:
June 20, 2019
Filing Date:
December 17, 2018
Export Citation:
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Assignee:
FURUKAWA ELECTRIC CO LTD (Postcode1008322, JP)
International Classes:
H01S3/067; G02B6/26
Domestic Patent References:
WO2002027369A12002-04-04
Foreign References:
JP2002237637A2002-08-23
JP2012209430A2012-10-25
JP2009129940A2009-06-11
US4962986A1990-10-16
JP2006019490A2006-01-19
JP2010239035A2010-10-21
JPH0325985A1991-02-04
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (Toranomon Mitsui Building, 8-1 Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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