The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
Aug. 19, 2011
Itaru Ishida, Sakura, JP;
Shoji Tanigawa, Sakura, JP;
Shoichiro Matsuo, Sakura, JP;
Toshio Kurashima, Tsukuba, JP;
Kazuhide Nakajima, Tsukuba, JP;
Tomoya Shimizu, Tsukuba, JP;
Takashi Matsui, Tsukuba, JP;
Yukihiro Goto, Tsukuba, JP;
Itaru Ishida, Sakura, JP;
Shoji Tanigawa, Sakura, JP;
Shoichiro Matsuo, Sakura, JP;
Toshio Kurashima, Tsukuba, JP;
Kazuhide Nakajima, Tsukuba, JP;
Tomoya Shimizu, Tsukuba, JP;
Takashi Matsui, Tsukuba, JP;
Yukihiro Goto, Tsukuba, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
FUJIKURA LTD., Tokyo, JP;
Abstract
A measuring method of a hole diameter of a holey optical fiber includes calculating an arithmetical mean value I(x) from two backscattering light intensities at a position x of two backscattering light waveforms of the holey optical fiber, in which the two backscattering light waveforms are obtained by OTDR measurement; and obtaining the hole diameter at the position x, based on a correlation between an arithmetical mean value I(x) and an hole diameter of the holey optical fiber that is obtained in advance.