Title:
FIBER FOR IN-MODE LOSS DIFFERENCE COMPENSATION, LIGHT AMPLIFIER AND TRANSMISSION PATH DESIGN METHOD
Document Type and Number:
Japanese Patent JP2020024271
Kind Code:
A
Abstract:
To provide a fiber for in-mode loss difference compensation capable of reducing in-mode loss difference with a simple structure and without needing precise alignment work, and provide a light amplifier and transmission path design method.SOLUTION: A fiber 10 for inter-mode loss difference compensation gives excess loss to a desired propagation mode by forming a cavity part 3 or a ring-shaped high refractive index part in a core 1 of an optical fiber. The electric field distribution of a specific mode of propagating the fiber is controlled by giving a hollow or ring-shaped high refractive index part to a part of the profile of the core, to give different loss for each propagation mode at the interface between the cavity part or ring-shaped high refractive index part and a region having no such a part.SELECTED DRAWING: Figure 1
Inventors:
YAMASHITA YOKO
WADA MASAKI
MATSUI TAKASHI
NAKAJIMA KAZUHIDE
WADA MASAKI
MATSUI TAKASHI
NAKAJIMA KAZUHIDE
Application Number:
JP2018148082A
Publication Date:
February 13, 2020
Filing Date:
August 07, 2018
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G02B6/02; G02B6/032; G02B6/036; H01S3/10; H04B10/07; H04B10/2581; H04J14/04
Domestic Patent References:
| JP2016537659A | 2016-12-01 | |||
| JP2005266808A | 2005-09-29 | |||
| JP2017157757A | 2017-09-07 |
Foreign References:
| US6434311B1 | 2002-08-13 | |||
| WO2018025847A1 | 2018-02-08 | |||
| US20070206912A1 | 2007-09-06 | |||
| WO2018008635A1 | 2018-01-11 |
Attorney, Agent or Firm:
Kenji Okada
Katsuhiro Imashita
Katsuhiro Imashita