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公开(公告)号：US20170123162A1
公开(公告)日：2017-05-04
申请号：US15300494
申请日：2015-03-31
Applicant: FUJIKURA LTD. , NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Takaharu MATSUDA , Hung Huu LUONG , Tatsuya OTA , Kazuhiro TAKIZAWA , Hiroichi KATAYOSE , Koji ISHIZUKA , Makoto SHINPO , Kunihiro TOGE
CPC classification number: G02B6/382 , G02B6/3806 , G02B6/3821 , G02B6/3846 , G02B6/3881 , G02B6/443 , G02B6/4471
Abstract: An optical fiber splicer includes a fiber fixing portion, a first optical fiber fixed to the fiber fixing portion, a clamp portion which is capable of holding and fixing an extending portion extended from the fiber fixing portion of the first optical fiber and a tip portion of a second optical fiber optically connected to the extending portion of the first optical fiber between a base member and a pressing member being openable and closable with respect to the base member, and a solid index matching material which is attached to a tip surface of the extending portion of the first optical fiber and is interposed between the first optical fiber and the second optical fiber.
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公开(公告)号：US20240061188A1
公开(公告)日：2024-02-22
申请号：US18270911
申请日：2021-01-20
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Chisato FUKAI , Yoshiteru ABE , Kunihiro TOGE , Kazunori KATAYAMA
CPC classification number: G02B6/3885 , G02B6/403
Abstract: An object of the present disclosure is to enable a plurality of single-core fibers to be easily and collectively connected. The present disclosure relates to a cylindrical multi-core ferrule having a cylindrical shape and having through holes formed therein for holding a plurality of optical fibers on the same circle centered on a central axis of the cylindrical shape and an optical connector in which the cylindrical multi-core ferrule are disposed opposite to each other and a gap is formed between end surfaces of an optical fiber held by the cylindrical multi-core ferrule.
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公开(公告)号：US20210223095A1
公开(公告)日：2021-07-22
申请号：US15734211
申请日：2019-05-29
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yoshifumi WAKISAKA , Daisuke IIDA , Kunihiro TOGE , Tetsuya MANABE
Abstract: An object is to provide an optical fiber path search method, an optical fiber path search system, a signal processor, and a program that can be operated free of the effects of walls, supporting members, and the like so that only a signal generated by an acoustic wave propagating through the air can be extracted. An optical fiber path search system according to the present invention utilizes DAS and includes: a vibration source 304 configured to provide an acoustic wave to a predetermined region; a light reflection measurement device 305 configured to be connected to one end of an optical fiber 302 and configured to measure vibration of a change in an optical path length from the other end of the optical fiber 302 to a point in the optical fiber 302 due to the acoustic wave provided by the vibration source 304; and a signal processor 313 configured to extract a signal component in a high frequency region higher than a preset cutoff frequency from a signal of the vibration of the change in the optical path length measured by the light reflection measurement device 305 and calculate a distance between the vibration source 304 and the point in the optical fiber 302 using the signal component.
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公开(公告)号：US20240134127A1
公开(公告)日：2024-04-25
申请号：US18273177
申请日：2021-02-03
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Chisato FUKAI , Kunihiro TOGE , Yoshiteru ABE , Kazunori KATAYAMA
CPC classification number: G02B6/354 , G02B6/02042 , G02B6/381
Abstract: An object of the present disclosure is to provide a simple, compact optical switch with low power consumption. The present disclosure is an optical switch that includes: a first multi-core optical fiber having a plurality of cores on the same circumference from a central axis in a cross section perpendicular to a long axis direction; a first ferrule incorporating the first multi-core optical fiber; a second multi-core optical fiber in which cores are arranged at respective positions corresponding to the plurality of cores of the first multi-core optical fiber in a cross section perpendicular to the long axis direction; a second ferrule incorporating the second multi-core optical fiber and having an outer diameter equal to that of the first ferrule; a split sleeve for accommodating the first ferrule and the second ferrule in such a manner that the first ferrule and the second ferrule are opposed to each other on a central axis; a slit space adjustment jig for adjusting a space of a slit of the split sleeve; and a rotation mechanism for rotating one of the first ferrule and the second ferrule around the central axis.
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公开(公告)号：US20240085632A1
公开(公告)日：2024-03-14
申请号：US18271982
申请日：2021-01-20
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Chisato FUKAI , Kunihiro TOGE , Tomohiro KAWANO
IPC: G02B6/35
CPC classification number: G02B6/3504 , G02B6/3546
Abstract: An object of the present disclosure is to enable monitoring of signal light transmitted through an optical cross-connect apparatus to be achieved with low loss and economically, in the optical cross-connect apparatus using a plurality of optical switches connected thereto.
The present disclosure relates to an optical cross-connect apparatus including a plurality of optical path switching means on input/output sides, in which the optical path switching means includes two multi-core optical fibers having different core arrangements, optical coupling between cores of the two multi-core optical fibers is switchable by rotation of at least one of the two multi-core optical fibers, and a first multi-core optical fiber of the two multi-core optical fibers includes a first core that transmits signal light propagated by optical coupling between the cores of the two multi-core optical fibers, and a second core that propagates leakage light of the signal light.-
Patent Agency Ranking
公开(公告)号：US20230324621A1
公开(公告)日：2023-10-12
申请号：US18018705
申请日：2020-08-03
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Chisato FUKAI , Kunihiro TOGE , Tomohiro KAWANO
CPC classification number: G02B6/3512 , G02B6/02042 , G02B6/3504
Abstract: The present disclosure aims to provide an optical switch that has low power consumption, and can achieve stable optical characteristics to cope with external factors with a mechanism that does not require any complicated assembly process. An optical switch according to the present disclosure characteristically includes: an optical coupling portion including: a multi-core optical fiber that has a central core at the center of an optical fiber and a plurality of outer cores on the circumference of the identical circle centering around the optical fiber in a fiber cross-section; a mirror that is disposed in front of an end face of the multi-core optical fiber, and couples one of the outer cores with the central core to form one optical path; and a cylindrical member that has an end face to which the mirror is fixed; and a rotation mechanism that rotates the multi-core optical fiber or the cylindrical member in an axial direction of the multi-core optical fiber, and switches the optical path in the optical coupling portion.
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公开(公告)号：US20240151909A1
公开(公告)日：2024-05-09
申请号：US18272644
申请日：2021-01-29
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Chisato FUKAI , Kunihiro TOGE , Tomohiro KAWANO
IPC: G02B6/35
CPC classification number: G02B6/3504
Abstract: An object of the present disclosure is to reduce transmission loss deviation between ports in an optical cross-connect device using a rotary optical switch.
The present disclosure is an optical cross-connect device in which optical switches for switching a plurality of optical paths using optical fibers are connected to each other using optical paths, the optical switch collectively switches the plurality of optical paths using a rotating body, and the optical cross-connect device includes: a cross wiring part which connects an optical path having a large loss in one of the optical switches among the plurality of optical paths which are switched collectively and an optical path having a small loss in the other optical switch of the plurality of optical paths which are switched collectively to an optical path connecting the optical switches to each other.-
公开(公告)号：US20240094477A1
公开(公告)日：2024-03-21
申请号：US18271899
申请日：2021-01-27
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Chisato FUKAI , Yoshiteru ABE , Kunihiro TOGE , Kazunori KATAYAMA
CPC classification number: G02B6/3874 , G02B6/3871 , G02B6/403
Abstract: An objective of the present disclosure is to provide an optical coupler and an optical switch capable of achieving stable optical characteristics with low power consumption and more economical efficiency with respect to external factors. To achieve the objective, an optical coupler according to the present disclosure includes: a first ferrule in which core centers of one or a plurality of single core fibers are arranged on the same circumference from the center on a fiber cross-section;
a second ferrule in which core centers of a plurality of single core fibers are arranged on a circumference of the same diameter as the circumference of the first ferrule in which the core centers of the single core fibers are arranged from the center on the fiber cross-section; and
a cylindrical sleeve which has a hollow portion into which the first and second ferrules are inserted so that central axes of the first and second ferrules are aligned with each other with a predetermined gap between each of outer diameters of the first and second ferrules and an inner diameter of the hollow portion so that the first and second ferrules can rotate.-
公开(公告)号：US20240056708A1
公开(公告)日：2024-02-15
申请号：US18266766
申请日：2020-12-16
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Tomohiro KAWANO , Kunihiro TOGE , Chisato FUKAI , Kazunori KATAYAMA
CPC classification number: H04Q11/0062 , H04B10/807 , H02J50/30 , H04Q2213/08 , H04Q2011/0083
Abstract: The disclosure provides a monitoring control device and an optical power supply system in which a system capable of remotely controlling many optical power supply type optical nodes can be economically constructed. A monitoring control device according to the present disclosure includes control means for executing power supply and power supply time allocation for selecting a control target optical node based on the amount of stored energy of a plurality of optical nodes. According to the present disclosure, in a system that includes a monitoring control device installed in a power supply environment and one or a plurality of remotely arranged optical line switching nodes, optical power supply and control of a plurality of optical switches included in the nodes and management of an amount of stored power can be simultaneously implemented with a single laser. Thus, it is possible to provide an economical optical line switching node system.
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公开(公告)号：US20220155139A1
公开(公告)日：2022-05-19
申请号：US17440514
申请日：2020-03-19
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yoshifumi WAKISAKA , Daisuke IIDA , Kunihiro TOGE , Hiroyuki OSHIDA
Abstract: It is intended to provide a phase measurement method and a signal processing device that are capable of reducing influence of noise of a measuring device without increasing the peak intensity of an incident light pulse when measuring the phase of scattered light in DAS-P.
A phase measurement method according to the present invention causes wavelength-multiplexed pulse light to be incident on a measurement target optical fiber, produces a scattered light vector obtained by plotting scattered light from the measurement target optical fiber for each wavelength onto a two-dimensional plane having the in-phase component thereof on the horizontal axis and the orthogonal component thereof on the vertical axis, rotates the produced scattered light vector for each wavelength at each place in the measurement target optical fiber to align the directions of the vectors, generates a new vector by calculating the arithmetic average of the vectors having the aligned directions, and calculates the phase by using the values of the in-phase and orthogonal components of the generated new vector.
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