Invention Grant
US09562827B2 Measuring method of longitudinal distribution of bending loss of optical fiber, measuring method of longitudinal distribution of actual bending loss value of optical fiber, test method of optical line, manufacturing method of optical fiber cable, manufacturing method of optical fiber cord, and manufacturing method of optical fiber
有权
光纤弯曲损耗的纵向分布测量方法，光纤实际弯曲损耗值的纵向分布测量方法，光线路测试方法，光纤电缆的制造方法，光纤线的制造方法及其制造方法 光纤
- Patent Title: Measuring method of longitudinal distribution of bending loss of optical fiber, measuring method of longitudinal distribution of actual bending loss value of optical fiber, test method of optical line, manufacturing method of optical fiber cable, manufacturing method of optical fiber cord, and manufacturing method of optical fiber
- Patent Title (中): 光纤弯曲损耗的纵向分布测量方法，光纤实际弯曲损耗值的纵向分布测量方法，光线路测试方法，光纤电缆的制造方法，光纤线的制造方法及其制造方法 光纤
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Application No.: US13213506Application Date: 2011-08-19
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Publication No.: US09562827B2Publication Date: 2017-02-07
- Inventor: Shoji Tanigawa , Itaru Ishida , Shoichiro Matsuo , Toshio Kurashima , Kazuhide Nakajima , Tomoya Shimizu , Takashi Matsui , Yukihiro Goto
- Applicant: Shoji Tanigawa , Itaru Ishida , Shoichiro Matsuo , Toshio Kurashima , Kazuhide Nakajima , Tomoya Shimizu , Takashi Matsui , Yukihiro Goto
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: FUJIKURA LTD.,NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- Current Assignee: FUJIKURA LTD.,NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- Current Assignee Address: JP Tokyo JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2010-185320 20100820
- Main IPC: G01M11/00
- IPC: G01M11/00
Abstract:
A measuring method of a longitudinal distribution of bending loss of an optical fiber includes calculating an arithmetical mean value I(x) from two backscattering light intensities of two backscattering light at a position x obtained by bidirectional OTDR measurement of the optical fiber; and obtaining a bending loss value at the position x from a mode field diameter 2W(x) and a relative refractive index difference Δ(x) at the position x calculated from the arithmetical mean value.
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