公开(公告)号：US20130243380A1

公开(公告)日：2013-09-19

申请号：US13887860

申请日：2013-05-06

Applicant: FUJIKURA LTD. ,  OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION

Inventor： Ryo MARUYAMA ,  Nobuo KUWAKI ,  Shoichiro MATSUO ,  Masaharu OHASHI

IPC: G02B6/02

CPC classification number: G02B6/02 ,  G02B6/02019 ,  G02B6/03627

Abstract: An optical fiber (1) includes (i) an inner core (111) whose refractive index distribution has an a profile, (ii) an outer core (112) which surrounds the inner core (111), and (iii) a clad (12) which surrounds the outer core (112). In the optical fiber (1), Rd is set to not less than 0.15, where Rd is a ratio of a refractive index difference between the outer core (112) and the clad (12) to a refractive index difference between a center part of the inner core (111) and the clad (12).

Abstract translation: 光纤（1）包括（i）其折射率分布具有轮廓的内芯（111），（ii）围绕内芯（111）的外芯（112），以及（iii）包层 12）围绕外芯（112）。 在光纤（1）中，Rd被设定为不小于0.15，其中Rd是外芯（112）和包层（12）之间的折射率差之比与中心部分之间的折射率差 内芯（111）和包层（12）。

公开(公告)号：US20200326471A1

公开(公告)日：2020-10-15

申请号：US16956131

申请日：2019-02-01

Applicant: Fujikura Ltd.

Inventor： Ryo MARUYAMA

IPC: G02B6/028 ,  G02B6/02

Abstract: An optical fiber includes: a core; a depressed layer surrounding the core; and a cladding surrounding the depressed layer. A refractive index profile of the core is an α-th power distribution having an index α of 1.0 or more and 2.9 or less. A relative refractive index difference Δ− of the depressed layer with respect to the cladding has an absolute value |Δ−| that is 0.05% or more and 0.15% or less. A ratio r1/r2 of a radius r1 of the core to an outer radius r2 of the depressed layer is 0.35 or more and 0.60 or less. A cable cutoff wavelength λcc of 22 m is less than 1.26 μm. A mode field diameter at a wavelength of 1.31 inn is larger than 8.6 inn and smaller than 9.5 μm.

公开(公告)号：US20170045681A1

公开(公告)日：2017-02-16

申请号：US15306632

申请日：2016-02-22

Applicant: Fujikura Ltd.

Inventor： Ryo MARUYAMA ,  Nobuo KUWAKI

IPC: G02B6/028 ,  G02B6/02 ,  C03B37/027

CPC classification number: G02B6/0288 ,  C03B37/027 ,  C03B37/02745 ,  C03B2205/07 ,  C03C25/47 ,  G02B6/02047 ,  G02B6/0239 ,  G02B6/02395 ,  G02B6/03611 ,  G02B6/4484

Abstract: An optical fiber which allows propagation of two or more modes, and in a case where a mode coupling coefficient between at least two modes among the two or more modes is h [1/km], the length of the optical fiber is z [km], and the amount XT of coupling between the two modes is represented by XT=10·log10(zh) [dB], the amount XT of coupling satisfies Expression (A) described below. XT≧+14 [dB]  (A)

Abstract translation: 根据本发明的光纤传输两种或更多种模式。 当两个或更多个模式中的至少两个模式之间的模式耦合系数被设置为h [1 / km]时，光纤的长度被设置为z [km]，并且两者之间的耦合水平XT 模式由XT = 10·log10（zh）[dB]表示，耦合电平XT满足公式（A）。 XT≥+ 14 [dB] ...（A）