公开(公告)号：US20170139130A1

公开(公告)日：2017-05-18

申请号：US14944798

申请日：2015-11-18

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Kazuhiro YONEZAWA ,  Tadashi ENOMOTO

IPC: G02B6/028 ,  G02B6/02 ,  C03C13/04 ,  G02B6/036

CPC classification number: G02B6/0288 ,  C03C13/045 ,  C03C2201/10 ,  C03C2201/11 ,  C03C2201/12 ,  C03C2201/28 ,  C03C2201/31 ,  G02B6/02214 ,  G02B6/03627 ,  G02B6/0365

Abstract: The present invention relates to an MMF with a structure for relaxing wavelength dependence of transmission bandwidth. In the MMF, a doping amount of a dopant for control of refractive index is adjusted, so as to make each of an OFL bandwidth at a wavelength of 850 nm and an OFL bandwidth at a wavelength of at least one of 980 nm, 1060 nm, and 1300 nm become not less than 1500 MHz·km, make the OFL bandwidth at the wavelength of at least one of 980 nm, 1060 nm, and 1300 nm become wider than the OFL bandwidth at the wavelength of 850 nm, and effectively suppress increase in transmission loss.

公开(公告)号：US20250034024A1

公开(公告)日：2025-01-30

申请号：US18780966

申请日：2024-07-23

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Takahito ENDO ,  Manabu SHIOZAKI ,  Shuhei TOYOKAWA ,  Kazuhiro YONEZAWA ,  Yuuji IZUMI ,  Maoto NOZEKI

IPC: C03B37/014

Abstract: An embodiment of the present disclosure provides a method for manufacturing an optical fiber in which an optical fiber is manufactured using a drawing furnace including a carbon furnace tube. The method includes drawing the optical fiber while supplying gas having an oxygen concentration of 3 ppm or more and 20 ppm or less as a major component of inert gas into the furnace tube.

公开(公告)号：US20160291246A1

公开(公告)日：2016-10-06

申请号：US14609689

申请日：2015-01-30

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Manabu SHIOZAKI ,  Kazuhiro YONEZAWA ,  Tadashi ENOMOTO

IPC: G02B6/028 ,  C03C13/04 ,  G02B6/036

CPC classification number: G02B6/0288 ,  C03C13/046 ,  C03C25/1061 ,  C03C2201/28 ,  C03C2201/31 ,  G02B6/03627 ,  G02B6/0365

Abstract: An embodiment of the invention relates to a GI-MMF with a structure for achieving widening of bandwidth in a wider wavelength range and improving manufacturing easiness of a refractive index profile in a core. In an example of the GI-MMF, a whole region of the core is doped with Ge and a part of the core is doped with P. Namely, the Ge-doped region coincides with the whole region of the core and the Ge-doped region is comprised of a partially P-doped region doped with Ge and P; and a P-undoped region doped with Ge but not intentionally doped with P.

Abstract translation: 本发明的实施例涉及具有用于在更宽波长范围内实现带宽扩大并提高芯体中的折射率分布的制造容易度的结构的GI-MMF。 在GI-MMF的示例中，芯的整个区域掺杂有Ge，并且一部分核掺杂有P.即，Ge掺杂区域与芯的整个区域重合，并且Ge掺杂 区域由掺杂有Ge和P的部分P掺杂区域组成; 和掺杂有Ge但未有意掺杂的P的未掺杂区域。

公开(公告)号：US20140140673A1

公开(公告)日：2014-05-22

申请号：US14065599

申请日：2013-10-29

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Kazuhiro YONEZAWA ,  Tadashi ENOMOTO

IPC: C03B37/014 ,  G02B6/028 ,  G02B6/02

CPC classification number: C03B37/01446 ,  C03B37/0146 ,  C03B2201/07 ,  C03B2201/20 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2203/24 ,  C03B2203/26 ,  G02B6/02 ,  G02B6/0288 ,  Y02P40/57

Abstract: The present invention relates to a preform manufacturing method and others for effectively reducing variation in refractive index due to chlorine used in manufacture of an optical fiber preform. The manufacturing method includes a dechlorination step carried out between a point of an end time of a dehydration step and a point of a start time of a sintering step, the dechlorination step being a step of heating a porous preform after dehydrated, in an atmosphere containing no chlorine-based dehydrating agent, for a given length of time while maintaining a temperature lower than a sintering temperature, thereby removing chlorine from the porous preform after dehydrated.

Abstract translation: 本发明涉及一种用于有效地减少由于在制造光纤预制件时使用的氯引起的折射率变化的预制件制造方法。 制造方法包括在脱水步骤的结束时间点和烧结步骤的开始时间点之间进行的脱氯工序，脱氯工序是在脱水后的多孔预成型体的加热步骤中，在含有 在保持低于烧结温度的温度的同一时间段内，不脱氯脱水剂，从而在脱水后从多孔预型体中除去氯。

公开(公告)号：US20250051216A1

公开(公告)日：2025-02-13

申请号：US18798059

申请日：2024-08-08

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Kazuhiro YONEZAWA

IPC: C03B37/027 ,  C03B37/012

Abstract: An optical fiber manufacturing apparatus includes: a drawing furnace configured to heat and fuse an optical fiber preform and draw the optical fiber preform to obtain a glass fiber; a cooling device configured to cool the glass fiber; and at least one preliminary chamber provided at an upper end of the cooling device. The optical fiber manufacturing apparatus further includes: a hydrogen gas supply device configured to supply hydrogen gas into the cooling device; and an inert gas supply device configured to supply inert gas into the at least one preliminary chamber.

公开(公告)号：US20190169064A1

公开(公告)日：2019-06-06

申请号：US16322182

申请日：2017-08-01

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Tadashi ENOMOTO ,  Kazuhiro YONEZAWA

IPC: C03B37/018 ,  G02B6/028 ,  C03B19/06

Abstract: The present embodiment relates to a production method for matching a shape of a refractive index profile of a core preform with an ideal curve with high precision and in a short time. Prior to a glass synthesis step of stacking a plurality of glass layers including a refractive index adjusting agent of a predetermined amount on an inner peripheral surface or on an outer peripheral surface of a glass deposition substrate, glass synthesis actual-result data is created from production condition data of a glass preform produced in the past and refractive index profile data of a core preform obtained from the glass preform. In each glass synthesis section where the glass synthesis step is executed, a doping amount of the refractive index adjusting agent is adjusted on the basis of the glass synthesis actual-result data.

公开(公告)号：US20170059773A1

公开(公告)日：2017-03-02

申请号：US14837206

申请日：2015-08-27

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Kazuhiro YONEZAWA ,  Tadashi ENOMOTO

IPC: G02B6/028 ,  G02B6/02 ,  G02B6/036

CPC classification number: G02B6/0288 ,  G02B6/02214 ,  G02B6/03627 ,  G02B6/03694

Abstract: An embodiment of the invention relates to a MMF with a structure for enabling stable manufacture of the MMF suitable for wide-band multimode optical transmission, for realizing faster short-haul information transmission than before. In the MMF, when an input position of a DMD measurement pulse on an input end face is represented by a distance r from a center of a core with a radius a, a power of the DMD measurement pulse on an output end face with the input position r of the DMD measurement pulse being 0.8a is not more than 70% of a power of the DMD measurement pulse on the output end face with the input position r of the DMD measurement pulse being 0.

Abstract translation: 本发明的实施例涉及具有用于能够稳定地制造适用于宽带多模光传输的MMF的结构的MMF，用于实现比以前更快的短程信息传输。 在MMF中，当输入端面上的DMD测量脉冲的输入位置由距离为半径a的芯的中心的距离r表示时，输出端的DMD测量脉冲的功率与输入端面对 DMD测量脉冲为0.8a的位置r不超过DMD测量脉冲的输入位置r为0的输出端面上的DMD测量脉冲的功率的70％。

公开(公告)号：US20170057864A1

公开(公告)日：2017-03-02

申请号：US15252901

申请日：2016-08-31

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Saori KUBARA ,  Tomohiro ISHIHARA ,  Kazuhiro YONEZAWA

IPC: C03B37/025 ,  C03B37/018 ,  G02B6/028

CPC classification number: G02B6/0288 ,  C03B37/01413 ,  C03B37/01815 ,  C03B2203/26 ,  C03B2207/70

Abstract: A method of manufacturing multi-mode optical fiber is disclosed. The method of manufacturing includes: a step of forming a first glass base material while controlling a supply rate of an additive for adjusting a refractive index to achieve a desired refractive index distribution; a step of drawing the first glass base material; a step of measuring a residual stress distribution in a radial direction of the multi-mode optical fiber after being drawn; a step of readjusting the supply rate of the additive in accordance with deviation of a refractive index, acquired from the residual stress distribution measured, from the desired refractive index distribution; a step of forming a second glass base material while supplying the additive at the supply rate after being readjusted; and a step of drawing the second glass base material.

Abstract translation: 公开了一种制造多模光纤的方法。 制造方法包括：在控制用于调节折射率的添加剂的供给速率以实现期望的折射率分布的同时形成第一玻璃基材的步骤; 拉制第一玻璃基材的步骤; 在拉伸后测量多模光纤的径向残余应力分布的步骤; 根据所需折射率分布，根据所测量的残余应力分布获得的折射率的偏差，重新调整添加剂的供给速度的步骤; 在重新调整之后，以供给速度供给添加剂的同时形成第二玻璃基材的工序; 以及拉拔第二玻璃基材的工序。

公开(公告)号：US20160216439A1

公开(公告)日：2016-07-28

申请号：US14306604

申请日：2014-06-17

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Kazuhiro YONEZAWA ,  Sotaro IDA ,  Tadashi ENOMOTO

IPC: G02B6/028 ,  G02B6/036

CPC classification number: G02B6/0288 ,  G02B6/0281 ,  G02B6/03627 ,  G02B6/0365

Abstract: An embodiment of the present invention relates to an MMF with a structure for reducing length dependence of optical characteristics while maintaining bend-insensitivity. The MMF has a trench portion provided between a core portion and a cladding portion and having a refractive index lower than that of the cladding portion. In a cross section of the MMF, the trench portion in at least a partial section of the MMF has a non-circularly symmetric shape with respect to an intersection between the optical axis and the cross section.

Abstract translation: 本发明的实施例涉及一种具有减少光学特性的长度依赖性同时保持弯曲不敏感性的结构的MMF。 MMF具有设置在芯部和包层部之间的折射率低于包层部的折射率的沟槽部。 在MMF的横截面中，MMF的至少部分部分中的沟槽部分相对于光轴和横截面之间的交点具有非圆形对称的形状。