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1. 发明专利

JPH09222527A OPTICAL BRANCH UNIT, AND EXTRA-LENGTH STORAGE BOX AND LINER USED FOR SAME 失效
公开(公告)号：JPH09222527A
公开(公告)日：1997-08-26
申请号：JP2946596
申请日：1996-02-16
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OTA IKUO , FURUKAWA KOICHI , WATANABE KAZUKI , KUROIWA MASATO , NAKAO NAOKI , EBIHARA TAKASHI , MIMA TAKASHI
IPC分类号： G02B6/24
摘要： PROBLEM TO BE SOLVED: To suppress the entanglement of many optical fibers, facilitate switching operation, and exert adverse influence on communication light in an in-service state by providing a coupler storage box and a 1st and a 2nd mount part where an extra- length storage box is mounted so that it can freely be extracted. SOLUTION: The optical branch unit 10 is equipped with the coupler storage box part 10a, and 1st and 2nd mount parts 10b and 10c and guide rails 10d... are formed at an upper part. Respective optical fibers 14 have specific length secured between the coupler storage part 10a and 1st and 2nd mount parts 10b and 10c in consideration of the outward leading of the extra-length storage boxes 17 and 18. This 1st mount part 10b is a part where the extra-length storage box 17 which stores the extra length of a test fiber 15 is mounted in a free extraction state, and formed on a right-side upper half part as the lead-out side of the optical branch unit 10. Further, the 2nd mount part 10c is a part where the extra storage box 18 which contains the extra length of a terminated fiber 16 is mounted in a free extraction state and formed at a right-side lower half part as the leading-out side of the optical branch unit 10.

2. 发明专利

JPH09197142A LIGHT BRANCHING UNIT 失效
公开(公告)号：JPH09197142A
公开(公告)日：1997-07-31
申请号：JP673296
申请日：1996-01-18
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OTA IKUO , NARAOKA SEIICHI , KUROIWA MASATO , NAKAO NAOKI , EBIHARA TAKASHI
IPC分类号： G02B6/44 , G02B6/00
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive light branching unit capable of being simply replaced without exerting influence upon optical communication. SOLUTION: This light branching unit 10 is used for an optical line access device for leading test light into an optical line and many units 10 are arrayed on a wiring frame at a prescribed pitch so as to be optionally attached/detached to connect a terminated out-of-station cable to an intra-station cable. Each unit 10 is provided with a coupler 11 for connecting at least one of an optical fiber 13 for the out-of-station cable and a test fiber 14 for leading test light into the unit 10 to one end of an intra-station side fiber 15 and an adaptor 12 fixed to the other end of the fiber 15 and connected to the intra-station cable so as to be optionally attached/detached.

3. 发明专利

JPH0943450A OPTICAL BRANCHING UNIT 失效
公开(公告)号：JPH0943450A
公开(公告)日：1997-02-14
申请号：JP19146195
申请日：1995-07-27
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OTA IKUO , FURUKAWA KOICHI , SHIMIZU TAKEO , TOMITA NOBUO , ATOBE NAOYUKI
IPC分类号： G01M11/00 , G02B6/00 , G02B6/122 , G02B6/28
摘要： PROBLEM TO BE SOLVED: To obtain an optical branching unit made higher in density to 2N fibers (N is >=4) from 4 fibers without changing sizes by specifying the number of coated fiber ribbons to be connected to both sides of a waveguide type optical coupler module having 2N pieces of coupler functions to N pieces per side. SOLUTION: The waveguide type optical coupler module 63 having eight pieces of coupler functions is used for the optical branching unit 61 the four-fiber coated fiber ribbons 25A, 25B are connected to the one side of this module and the four coated fiber ribbons 31A, 31B are connected to the opposite side thereof, thereby constituting communication ports on an extra-office side an intra-office side together with optical connectors. The four-fiber coated fiber ribbons 39A, 39B, 35A, 35B connected to the one side and the opposite side of the module 63 constitute their respective one-side test ports and the other-side test ports. The coated fiber ribbons connected to the module 63 are all the four-fiber coated fiber ribbons if the optical branching unit is constituted in such a manner and therefore, the space for housing the extra lengths thereof and the space for housing the optical connectors at their front ends is eventually necessitated to be the same as heretofore.

4. 发明专利

JPH09222518A EXTRA-LENGTH STORAGE BOX 失效
公开(公告)号：JPH09222518A
公开(公告)日：1997-08-26
申请号：JP2946696
申请日：1996-02-16
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： FURUKAWA KOICHI , OTA IKUO , WATANABE KAZUKI , KUROIWA MASATO , NAKAO NAOKI , EBIHARA TAKASHI , MIMA TAKASHI
IPC分类号： G02B6/00
摘要： PROBLEM TO BE SOLVED: To performs extra-length processing and efficiently store many optical fiber tapes separated from a terminated cable without any waste by specifying the height and width of the extra-length storage box. SOLUTION: The extra-length storage box 5 having a guide part 5a which is mounted into a storage rack or optical branch unit in a free insertion/ extraction state and wound with a terminal of an optical fiber tape 2a and a storage part 5b which contains the wound optical fiber tape terminal 2a is constituted as to meet a condition expressed by a/2.(14-π)+6b+30(π-26)>L, where (a) is the height, (b) is the width, and L is the extra-length processing length of the terminal of the optical fiber tape 2a. Consequently, the extra-length storage box which can store many optical fiber tapes separated from the terminated cable efficiently is obtained without any waste by performing the extra- length processing.

5. 发明专利

JPH09197143A LIGHT BRANCHING UNIT 失效
公开(公告)号：JPH09197143A
公开(公告)日：1997-07-31
申请号：JP673396
申请日：1996-01-18
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OTA IKUO , KUROIWA MASATO , NAKAO NAOKI , EBIHARA TAKASHI
IPC分类号： G02B6/44 , G02B6/00
摘要： PROBLEM TO BE SOLVED: To provide a light branching unit capable of easily executing connecting work on an optical fiber connection part for connecting an out-of- station cable to an intra-station cable without extracting the whole light branching unit and exerting adverse influence on optical communication. SOLUTION: This light branching unit 1 is used for an optical line accessing device for leading test light into an optical line and many units 10 are arrayed on a wiring frame at a prescribed pitch so as to be optionally attached/detached to connect a terminated out-of-station cable to an intra-station cable. An optical fiber connection part 11 for connecting an out-of-station cable to an intra-station cable and a sub-unit 10 for storing the excess length of an optical fiber are arranged so as to be optionally detached. The sub-unit 10 can be optionally drawn out from the unit 1 by ejecting or rotating it.

6. 发明专利

JPH07198968A TERMINAL STRUCTURE OF PARALLEL COATED FIBERS OF MULTIPLE OPTICAL FIBER CABLE 失效
公开(公告)号：JPH07198968A
公开(公告)日：1995-08-01
申请号：JP35419693
申请日：1993-12-28
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HAYAKAWA KOICHI , OTA IKUO , HASEMI AKIO , SHIMIZU MASANOBU , TOMITA NOBUO , SENDA KAZUNORI
IPC分类号： G02B6/30 , G02B6/04
摘要： PURPOSE:To provide a terminal structure of parallel coated fibers of multiple optical fiber cable without making an operation to recombine optical fibers after connection of a directional coupler. CONSTITUTION:A parallel integrating part 5 where a first optical fiber paralleling part 3 arranged and fixed with the first optical fibers 1 and a second optical fiber paralleling part 4 arranged and fixed with the second optical fibers 2 are superposed on each other is provided with a converting part 6 on its one end side. The first and second optical fibers 1, 2 are separated and recombined by the converting part 6 and are converted in arrangement in such a manner that the first optical fibers 1 and the second optical fibers 2 are alternately arranged. The converting part 6 is provided with a cover 26 to protect the converting part 6.

7. 发明专利

JPH10307239A OPTICAL FIBER 失效
公开(公告)号：JPH10307239A
公开(公告)日：1998-11-17
申请号：JP11828897
申请日：1997-05-08
申请人： FURUKAWA ELECTRIC CO LTD
发明人： OTA IKUO , YODO SHIGETO , WATANABE KAZUKI
IPC分类号： G02B6/02 , G02B6/10 , G02B6/44
摘要： PROBLEM TO BE SOLVED: To eliminate a process for a heat treatment for discharging hydrogen to the outside after a high-pressure hydrogen process by removing part of a carbon layer from a carbon-coated fiber formed by coating a bare fiber with a carbon layer and forming a grating on the core of the exposed bare fiber. SOLUTION: The carbon-coated fiber formed by coating the surface of the bare fiber 1 with the fine carbon layer 2 is used and the optical fiber 1 having the carbon layer 2 removed within a specific range is put in a specific processing chamber and treated with hydrogen in a high-pressure hydrogen atmosphere. The specific part which has the carbon layer 2 removed is irradiated by an excimer laser to vary the refractive index, thereby forming a grating 1c. Therefore, hydrogen penetrates only the part of the bar fiber 1a which has the grating 1c formed by removing the carbon layer 2 and the part impregnated with the hydrogen can be made extremely small, so the process for the heat treatment can nearly be eliminated.

8. 发明专利

JPH07146419A LOW-LOSS OPTICAL CONNECTOR 失效
公开(公告)号：JPH07146419A
公开(公告)日：1995-06-06
申请号：JP17720593
申请日：1993-05-27
申请人： FURUKAWA ELECTRIC CO LTD
发明人： OCHIAI TOSHIHIRO , HAYAKAWA KOICHI , OTA IKUO , KOBAYASHI KOICHI
IPC分类号： G02B6/36 , G02B6/24 , G02B6/40
摘要： PURPOSE:To reduce connection loss between connectors by enlarging a core diameter of an optical fiber at an optical connector end surface by an ion radiation process. CONSTITUTION:An ion radiation process is applied to a core part 2 of an optical fiber exposed in an abutting surface 4 of an optical connector 3, dope material added to the core part 2 is scattered to a clad part 1, and a diameter of the core part 2 is enlarged. An optical fiber is thus manufactured by applying the ion radiation process to the core part 2 of the optical fiber after installing the connector 3 on the optical fiber, and the diameter of the core part 2 exposed in the abutting surface 4 of the optical connector 3 only is enlarged, compared to a type in which the optical fiber is preliminarily heated by a burner or the like to enlarge the diameter of the core part 2 where the connector is installed, so irregularity of light waves by the diameter enlargement can be restricted to the minimum. Because the diameter is enlarged after the fiber is installed on the connector 3, troublesomenesses such as failure of installation of the connector 3 and then re-heat treating the optical fiber can be eliminated.

9. 发明专利

JPH06148451A CONNECTION STRUCTURE OF OPTICAL FIBER AND ITS MANUFACTURE 失效
公开(公告)号：JPH06148451A
公开(公告)日：1994-05-27
申请号：JP16027893
申请日：1993-06-04
申请人： FURUKAWA ELECTRIC CO LTD , TOKYO ELECTRIC POWER CO
发明人： HASEMI AKIO , HAYAKAWA KOICHI , OTA IKUO , KOBAYASHI KOICHI , IZUTSUI SHINTARO , KINOSHITA KAZUTAKA , NUMANOI TAKEO
IPC分类号： G02B6/24 , C04B28/08 , G02B6/255
摘要： PURPOSE:To provide the connection structure of optical fibers which increases the performance of a connection between different mode optical fibers, i.e., a multi-mode optical fiber and a single-mode optical fiber. CONSTITUTION:When the multi-mode optical fiber 1 and single-mode optical fiber 2 are connected, the core 2a of the single-mode optical fiber 2 which has a smaller core diameter than the core 1a of the multi-mode optical fiber 1 is heated to thermally diffuse a core dopant and the mode field diameter of the single-mode optical fiber 2 is increased almost to the mode field diameter of the multi-mode optical fiber 1. Consequently, a light signal which is suppressed in power distribution variation of light intensity is made incident on the single-mode optical fiber 2 from the multi-mode optical fiber 1.

10. 发明专利

JP2001042138A DEVICE AND METHOD FOR MANUFACTURING GRATING TYPE OPTICAL PARTS 失效
公开(公告)号：JP2001042138A
公开(公告)日：2001-02-16
申请号：JP21161499
申请日：1999-07-27
申请人： FURUKAWA ELECTRIC CO LTD
发明人： SHIGEMATSU TAKASHI , YODO SHIGETO , OTA IKUO , IBUSUKI YASUHIRO
IPC分类号： G02B5/18 , G02B6/02 , G02B6/10
摘要： PROBLEM TO BE SOLVED: To form a fiber grating with improved reproducibility and accuracy without causing damage or stains in a phase mask. SOLUTION: A positioning device used in applying a grating for an optical fiber 2 by irradiating the grating forming area 6 of an optical fiber 2 with ultraviolet rays through a phase mask 8 while emitting ultraviolet rays from the upper side of the phase mask 8, is constituted by providing an optical fiber arraying member 3 in which V-grooves 9 for arraying an optical fiber and pin inserting grooves 4 are formed at interal on the front surface side, and positioning pins 1 for securing a gap between the upper face of the optical fiber 2 which is arrayed in the V-groove and the phase mask 8. The depth of the V-groove 9 and that of the pin inserting groove 4 are nearly equalized to each other; the diameter of the positioning pin 1 is made larger than that of the optical fiber 2, the positioning pins 1 are inserted into the pin inserting grooves 4; the phase mask 8 is mounted on the upper side of the positioning pins 1, so that a gap is provided between the upper face of the optical fiber 2 and the phase mask 8.

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