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:
May. 26, 2026
Filed:
Feb. 21, 2022
Ntt, Inc., Tokyo, JP;
Atsushi Nakamura, Musashino, JP;
Yusuke Koshikiya, Musashino, JP;
NTT, Inc., Tokyo, JP;
Abstract
An object of the present invention is to provide an optical fiber testing device and an optical fiber testing method capable of acquiring both unidirectional crosstalk and bidirectional crosstalk of an uncoupled multicore fiber in a short time and with a little man-hour. The optical fiber testing deviceaccording to the present invention includes: the light input unitconfigured to input test light to an arbitrary core at one end A of the uncoupled multicore fiber; the light receiving unitconfigured to receive output light outputted from each core at the other end B of the uncoupled multicore fiberby the test light and measure light intensity of the output light of each core; and the calculation unitconfigured to calculate unidirectional transmission crosstalk in a case of performing unidirectional transmission, in which transmission directions of light beams are the same between two cores of the uncoupled multicore fiber, from the light intensity of the output light, and calculate bidirectional transmission crosstalk in a case of performing bidirectional transmission, in which transmission directions of light beams are different between two cores of the uncoupled multicore fiber, from the unidirectional transmission crosstalk.