公开(公告)号：US20230296828A1

公开(公告)日：2023-09-21

申请号：US18013113

申请日：2020-07-06

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hidenobu HIROTA ,  Takui UEMATSU ,  Hiroyuki IIDA ,  Takashi EBINE

IPC: G02B6/02 ,  G02B6/245

CPC classification number: G02B6/02395 ,  G02B6/245

Abstract: An object of the present disclosure is to enable an optical signal propagating through a core of an optical fiber to enter and exit without bending the optical fiber.
The optical fiber of the present disclosure includes: a core; a cladding layer having a refractive index lower than a refractive index of the core; and a coating layer that coats an outer periphery of the cladding layer, in which the cladding layer includes: a first cladding portion of which main component is the same as that of the core; and a second cladding portion of which main component is different from the main component of the first cladding portion, and is softer than the first cladding portion, and an interface between the first cladding portion and the second cladding portion is in contact with the core.

公开(公告)号：US20230081743A1

公开(公告)日：2023-03-16

申请号：US17794776

申请日：2020-02-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takui UEMATSU ,  Hidenobu HIROTA ,  Hiroyuki IIDA

IPC: G02B6/28

Abstract: An optical multiplexing and demultiplexing method of the present disclosure includes arranging, face to face, a polished surface of a coated optical fiber whose side surface is polished to a core or a vicinity of the core and a polished surface of a plurality of optical waveguides that are arranged in parallel in a longitudinal plane and that each have different propagation constants and whose side surfaces are polished to cores corresponding one to one therewith or vicinities of the cores; and aligning the polished surface of the coated optical fiber and the polished surface of the plurality of optical waveguides so that desired branching ratio is obtained from one end of the coated optical fiber to the end, distal to the former end, of one optical waveguide of the plurality of optical waveguides by relatively moving the polished surface of the coated optical fiber and the polished surface of the plurality of optical waveguides.

公开(公告)号：US20220166502A1

公开(公告)日：2022-05-26

申请号：US17600537

申请日：2020-03-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hidenobu HIROTA ,  Hiroyuki IIDA ,  Takui UEMATSU ,  Naotsugu AMBE

IPC: H04B10/079 ,  G02B6/28

Abstract: There are provided an optical fiber display system and an optical fiber changeover method each enabling an efficient optical fiber changeover work. The optical fiber display system according to the present invention includes a plurality of core wire identification terminals 101. Each of the core wire identification terminals 101 includes: bent part formation units 11 configured to form a bent part at an optional position of an optical fiber 50 and to leak optical signals propagating through the optical fiber 50 from the bent part; analysis units 12 configured to acquire identification numbers of communication apparatuses (51 and 52) included in the leaked optical signals, the communication apparatuses (51 and 52) being connected to respective ends of the optical fiber 50; a communication unit 13 configured to inquire of a database 201 storing relationship between the optical fiber and the communication apparatuses about the acquired identification numbers of the communication apparatuses, and to receive an identification number of the optical fiber 50 corresponding to the acquired identification numbers of the communication apparatuses, from the database 201; and a display unit 14 configured to display the acquired identification numbers of the communication

公开(公告)号：US20210195303A1

公开(公告)日：2021-06-24

申请号：US17271390

申请日：2019-08-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takui UEMATSU ,  Tetsuya MANABE ,  Hidenobu HIROTA ,  Hiroyuki IIDA

IPC: H04Q11/00 ,  H04L12/46 ,  H04B10/079

Abstract: The present disclosure intends to provide an optical signal from an ONU according to a desired service usage state without using the ONU and an OLT. A simulated signal light generation apparatus 10 according to the present disclosure is a simulated signal light generation apparatus 10 for simulating an uplink signal light generated in an optical network unit (ONU) in a passive optical network (PON), and the apparatus includes a usage state control unit 11 that sets a service usage state of the ONU, a signal generation unit 12 that generates an uplink signal frame according to the usage state set by the usage state control unit 11, and an electrical/optical conversion unit 13 that converts an electrical signal from the signal generation unit 12 into an optical signal, and the optical signal from the electrical/optical conversion unit 13 is repeatedly transmitted to an optical fiber core 22.

公开(公告)号：US20210191043A1

公开(公告)日：2021-06-24

申请号：US17053048

申请日：2019-04-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takui UEMATSU ,  Hidenobu HIROTA ,  Hiroyuki IIDA ,  Tetsuya MANABE

IPC: G02B6/28

Abstract: An object of the present invention is to provide a probe optical fiber and a local-light coupling apparatus for an optical fiber that can input light with high efficiency without performing input efficiency measurement or probe alignment. The present invention is a probe optical fiber of which a tip is close to a bent part of a coated optical fiber disposed in a local-light coupling apparatus for an optical fiber, and which inputs and outputs light to and from the bent part of the coated optical fiber, wherein light emitted from the tip has a light intensity profile in which in the bent part of the coated optical fiber, relative to a light intensity in a center of an optical axis, a decrease in light intensity at a position separated by 20 μm from the optical axis is less than 17.6 dB.

公开(公告)号：US20210124121A1

公开(公告)日：2021-04-29

申请号：US17254954

申请日：2019-06-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takui UEMATSU ,  Hidenobu HIROTA ,  Hiroyuki IIDA ,  Tetsuya MANABE

IPC: G02B6/28

Abstract: An object is to provide a highly versatile optical fiber local-light detection apparatus capable of supporting various types of coated optical fibers. An optical fiber local-light detection apparatus according to the present invention includes: a first jig 11 including a recess portion 22 curved along a longitudinal direction with respect to a coated optical fiber 100 and a light input/output unit 14 configured to emit light to the coated optical fiber 100 that is bent and to receive light leaking from the coated optical fiber 100; a second jig 12 including at least one protrusion portion 23 that is curved along the longitudinal direction with respect to the coated optical fiber 100, the second jig configured to clamp the coated optical fiber 100 with the recess portion 22 of the first jig 11, in accordance with a type of the coated optical fiber 100; a pressing portion configured to apply pressing force in a direction in which the recess portion 22 of the first jig 11 and the at least one protrusion portion 23 of the second jig 12 mutually approach, to bend the coated optical fiber 100; and a switching mechanism configured to switch the at least one protrusion portion 23 to a protrusion portion corresponding to the type of the coated optical fiber 100.