Invention Publication
- Patent Title: OPTICAL FIBER
- Patent Title (中): 光纤
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Application No.: EP15802920.7Application Date: 2015-06-03
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Publication No.: EP3153898A1Publication Date: 2017-04-12
- Inventor: KAWAGUCHI, Yuki , YAMAMOTO, Yoshinori , HIRANO, Masaaki
- Applicant: Sumitomo Electric Industries, Ltd.
- Applicant Address: 5-33, Kitahama 4-chome Chuo-ku Osaka-shi, Osaka 541-0041 JP
- Assignee: Sumitomo Electric Industries, Ltd.
- Current Assignee: Sumitomo Electric Industries, Ltd.
- Current Assignee Address: 5-33, Kitahama 4-chome Chuo-ku Osaka-shi, Osaka 541-0041 JP
- Agency: Hoffmann Eitle
- Priority: JP2014116529 20140605
- International Announcement: WO2015186719 20151210
- Main IPC: G02B6/036
- IPC: G02B6/036
Abstract:
Provided is an optical fiber having W-shaped refractive-index distribution and in which a micro-bend loss in an actual usage waveband is reduced. The optical fiber includes a core, inner cladding that surrounds the core and has a refractive index smaller than a refractive index of the core, and outer cladding that surrounds the inner cladding and has a refractive index smaller than the refractive index of the core and larger than the refractive index of the inner cladding. When a coupling coefficient between a fundamental mode and a cladding mode is denoted by C 01-CL , a coupling coefficient between the fundamental mode and a higher-order mode is denoted by C 01-11 , and a coupling coefficient between the higher-order mode and the cladding mode is denoted by C 11-CL , C total defined as C total = C 01-CL + C 01-11 C 11-CL has a minimum value at a wavelength ranging between 1520 nm and 1630 nm.
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