公开(公告)号：US10883860B2

公开(公告)日：2021-01-05

申请号：US16485096

申请日：2017-12-08

Applicant: FUJIKURA LTD.

Inventor： Kenichi Ohmori ,  Koji Omichi ,  Shingo Matsushita ,  Kentaro Ichii

IPC: G01B11/16 ,  G02B6/02 ,  G01D5/353

Abstract: An optical fiber sensor includes: a central core disposed at a center of an optical fiber; and an outer peripheral core that spirally surrounds the central core. The effective refractive index ne2 of the outer peripheral core is lower than the effective refractive index ne1 of the central core. A ratio between the effective refractive index ne2 and the effective refractive index ne1 matches a ratio between an optical path length of the central core and an optical path length of the outer peripheral core.

公开(公告)号：US20200041313A1

公开(公告)日：2020-02-06

申请号：US16485096

申请日：2017-12-08

Applicant: FUJIKURA LTD.

Inventor： Kenichi Ohmori ,  Koji Omichi ,  Shingo Matsushita ,  Kentaro Ichii

IPC: G01D5/353 ,  G02B6/02

Abstract: An optical fiber sensor includes: a central core disposed at a center of an optical fiber; and an outer peripheral core that spirally surrounds the central core. The effective refractive index ne2 of the outer peripheral core is lower than the effective refractive index ne1 of the central core. A ratio between the effective refractive index ne2 and the effective refractive index ne1 matches a ratio between an optical path length of the central core and an optical path length of the outer peripheral core.

公开(公告)号：US08509271B2

公开(公告)日：2013-08-13

申请号：US13628942

申请日：2012-09-27

Applicant: Fujikura Ltd.

Inventor： Yoshihiro Terada ,  Koji Omichi ,  Rintaro Morohashi

IPC: H01S3/30 ,  H01S3/08 ,  G02B6/34

CPC classification number: H01S3/0675 ,  G02B6/02133 ,  G02B6/02138 ,  G02B6/02185 ,  H01S3/08072 ,  H01S3/094011 ,  H01S3/09408 ,  H01S3/1618

Abstract: A method for manufacturing an optical fiber grating that includes first and second gratings that configure an optical resonator, the method including: forming the first grating by radiating ultraviolet light to an optical fiber so that a irradiation intensity Z satisfies the following Equation 1: Z≦(ΔλS/x+0.04556Y2+1.2225Y)/(0.05625Y2+1.6125Y) . . . Equation 1, where, Z represents an irradiation intensity (mJ/mm2) of the ultraviolet light, ΔλS represents the maximum shift amount of a reflection center wavelength of the first grating that is allowed as long as reflection wavelengths of the first grating and second grating overlap each other, x represents a shift amount of the reflection center wavelength per temperature change of 1° C. (nm/° C.) in the first grating, and Y represents an intensity (W) of the wave-guided light.

Abstract translation: 一种制造光纤光栅的方法，该光纤光栅包括配置光学谐振器的第一和第二光栅，该方法包括：通过向光纤辐射紫外光形成第一光栅，使得照射强度Z满足下列等式1：Z @ （DeltalambdaS / x + 0.04556Y2 + 1.2225Y）/（0.05625Y2 + 1.6125Y）。 的。 的。 等式1，其中，Z表示紫外线的照射强度（mJ / mm2），Deltal表示只要第一光栅和第二光栅的反射波长允许的第一光栅的反射中心波长的最大偏移量 重叠，x表示第一光栅中每1℃温度变化（nm /℃）的反射中心波长的偏移量，Y表示波导光的强度（W）。

公开(公告)号：US09488606B2

公开(公告)日：2016-11-08

申请号：US13728570

申请日：2012-12-27

Applicant: Fujikura Ltd.

Inventor： Koji Omichi ,  Yoshihiro Terada

IPC: G01N1/14 ,  G01N13/00 ,  G01N25/00 ,  G01K1/14 ,  G01K3/00 ,  G01K11/32 ,  G01K13/00

CPC classification number: G01N25/00 ,  G01K1/14 ,  G01K3/005 ,  G01K11/3206 ,  G01K13/006 ,  G01K2203/00

Abstract: A method for detecting a non-superconducting transition of a superconducting wire including a substrate, a superconducting layer having a critical temperature of 77 K or more, and a metal stabilization layer includes, adhesively attaching an optical fiber where a plurality of fiber Bragg gratings are formed in a core along a longitudinal direction thereof to the superconducting wire; measuring in advance a Bragg wavelength shift of the fiber Bragg gratings for a temperature variation of the superconducting wire, and determining a relational expression based on the shift for a temperature calculation of the superconducting wire; determining temperature variations of the fiber Bragg gratings before and after the non-superconducting transition of the superconducting wire using the relational expression; and calculating a propagation rate of the non-superconducting transition based on both a time difference of temperature increases of the fiber Bragg gratings, and an interval between each of the fiber Bragg gratings.

Abstract translation: 一种用于检测包括衬底，临界温度为77K或更高的超导层以及金属稳定层的超导线的非超导转变的方法，包括：粘附附着多个光纤布拉格光栅的光纤， 沿着其纵向方向形成在芯中至超导线; 预先测量用于超导线的温度变化的光纤布拉格光栅的布拉格波长偏移，并且基于超导线的温度计算的偏移来确定关系表达式; 使用关系式确定超导线的非超导转变之前和之后的光纤布拉格光栅的温度变化; 以及基于光纤布拉格光栅的温度升高的时间差以及每个光纤布拉格光栅之间的间隔来计算非超导转变的传播速率。

公开(公告)号：US09228890B2

公开(公告)日：2016-01-05

申请号：US13907371

申请日：2013-05-31

Applicant: FUJIKURA LTD.

Inventor： Koji Omichi ,  Yoshihiro Terada ,  Daiichiro Tanaka

IPC: G01H9/00

CPC classification number: G01H9/004 ,  G01H9/00

Abstract: Optical pulses are output from a light source to an optical fiber at one selected emission wavelength, a reflection light reflected at a fiber Bragg grating at the optical fiber is received at an optical receiver and is converted to a reflection signal by an optical to electrical conversion, a fiber Bragg grating which reflects the reflection light is identified by the signal processing unit when an intensity of the reflection signal obtained by the optical receiver is over a predetermined threshold value, and a measurement step that calculates acoustic frequencies at the fiber Bragg grating based on a temporal change of the intensity of the reflection signal at the fiber Bragg grating is repeated more than two times while changing an emission wavelength of the light source. The acoustic frequency at each fiber Bragg grating is calculated to determine an acoustic distribution along a longitudinal direction of the fiber.

Abstract translation: 在一个选定的发射波长下，光脉冲从光源输出到光纤，在光接收器处接收在光纤处的光纤布拉格光栅反射的反射光，并通过光电转换被转换为反射信号 当由光接收机获得的反射信号的强度超过预定阈值时，由信号处理单元识别出反射反射光的光纤布喇格光栅，以及基于光纤布拉格光栅的声频计算的测量步骤 在改变光源的发射波长的同时，在纤维布拉格光栅处的反射信号的强度的时间变化重复两次以上。 计算每个光纤布拉格光栅处的声频，以确定沿着光纤的纵向方向的声分布。

公开(公告)号：US09069116B2

公开(公告)日：2015-06-30

申请号：US14304270

申请日：2014-06-13

Applicant: FUJIKURA LTD. ,  NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIV.

Inventor： Hitoshi Uemura ,  Koji Omichi ,  Katsuhiro Takenaga ,  Kunimasa Saitoh

IPC: G02B6/02

CPC classification number: G02B6/02004 ,  G02B6/02042 ,  G02B6/4471

Abstract: A fan-in/fan-out device includes a plurality of single-core fibers which are connected to a plurality of first cores of a multicore fiber and which include an elongated portion extending in a longitudinal direction so as to reduce a diameter and being connected to a first end portion of the multicore fiber at a second end portion in an extending direction of the elongated portion, where a refractive index distribution of each of the single-core fibers has a single peak, a relative refractive index difference of a second core with respect to a second cladding in each of the single-core fibers is 0.8% or more; and a second mode field diameter of the second end portion of the elongated portion is greater than a first mode field diameter of the first end portion of the multicore fiber.

Abstract translation: 风扇/扇出装置包括多个单芯光纤，其连接到多芯光纤的多个第一芯，并且包括沿纵向方向延伸的细长部分，以减小直径并连接 在所述细长部分的延伸方向上的第二端部处的所述多芯纤维的第一端部，其中每个所述单芯纤维的折射率分布具有单个峰，所述第二芯的相对折射率差 相对于每个单芯纤维中的第二包层为0.8％以上; 并且所述细长部分的第二端部的第二模场直径大于所述多芯光纤的第一端部的第一模场直径。