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1. 发明专利

JPH01147410A FLUSH TYPE OPTICAL WAVEGUIDE 失效
公开(公告)号：JPH01147410A
公开(公告)日：1989-06-09
申请号：JP30535587
申请日：1987-12-02
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YANAGAWA HISAHARU , KAMATA YOSHIYUKI , UEKI TAKESHI , MIYAZAWA HIDEHISA , TANIFUJI TADATOSHI , MATSUURA MASAAKI , NAKAMOTO HIROSHI
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To suppress the scattering loss of both corner parts of the upper part of a core and to improve the transmission characteristic by forming a buffer layer between the core and the upper clad. CONSTITUTION:On a substrate 11, the lower buffer layer 12, the lower clad 13, a core 14 and a buffer layer 15 are formed in this order, and also, both side faces of the core 14 and the upper face of the buffer layer 15 are covered with the upper clad 16. Also, a relation of a refractive index n1 of the core 14, a refractive index n2 of the lower clad 13, a refractive index n3 of the upper clad 16 and a refractive index n4 of the buffer layer 15 is set to n1>n2, n1>n3, and n1>n4. In such a way, since the buffer layer 15 is formed between the core 14 and the upper clad 16, no scattering loss is generated in both corner parts 14a, 14b of the upper part of the core 14, and the transmission characteristic is improved.

2. 发明专利

JPH01198706A EMBEDDED TYPE OPTICAL WAVEGUIDE 失效
公开(公告)号：JPH01198706A
公开(公告)日：1989-08-10
申请号：JP30535487
申请日：1987-12-02
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YANAGAWA HISAHARU , KAMATA YOSHIYUKI , UEKI TAKESHI , MIYAZAWA HIDEHISA , TANIFUJI TADATOSHI , MATSUURA MASAAKI , NAKAMOTO HIROSHI
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To suppress or eliminate an increase of the loss of waveguide light caused by the roughness of a core corner part by forming the border surface part between a lower clad and a core above the top surface of the lower clad or forming a buffer layer between the core and upper clad. CONSTITUTION:This embedded type optical waveguide has the waveguide light propagated in its core 13. At this time, the border surface part 15 between the lower clad 12 and core 13 is formed above the top surface of the lower clad 12, so neither of both lower corner parts 13c and 13d of the core 13 have scatter loss and the transmission characteristics of the optical waveguide is improved by as much as the scatter loss is suppressed. Further, the scatter loss of not only both lower corner parts 13c and 13d of the core 13, but also both upper corner parts 13a and 13b of the core is also suppressed. Consequently, the transmission characteristics of the optical waveguide are improved more.

3. 发明专利

JP2002140942A OPTICAL COMPOSITE LEAD-IN WIRE AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002140942A
公开(公告)日：2002-05-17
申请号：JP2000337958
申请日：2000-11-06
申请人： CHUBU ELECTRIC POWER , HITACHI CABLE , FURUKAWA ELECTRIC CO LTD , FUJIKURA LTD
发明人： KONDO TAIKICHI , NIWA AKIHIRO , KAWASHIMA JUNICHI , TAKAHASHI YOSHIHIRO , WATANABE AKIRA , ISHIBASHI YOSHIO , FURUSAWA KENICHI , FUKAZAWA MASAKATA , KAMATA YOSHIYUKI , KIJIMA TAKASHI , KOBAYASHI KAZUNAGA , KUSAKARI MASAHIRO
IPC分类号： G02B6/46 , F16L9/18 , H01B7/00 , H01B11/22 , H01B13/00 , H02G1/06 , H02G7/00 , H02G9/06
摘要： PROBLEM TO BE SOLVED: To provide an optical composite lead-in wire allowing optical fiber units to be easily laid in only necessary places at a low cost and to provide its manufacturing method. SOLUTION: This optical composite lead-in wire 10 is composed by longitudinally attaching pipes 4 for inserting the optical fiber units 3 composed of coated optical fibers along the lengthwise direction of a low-voltage lead-in wire 2 for electric power composed by intertwining plural insulated cores 1, and by bundling the pipes 4 and the low-voltage lead-in wire 2 for electric power by the use of a bundling means 5. In this manufacturing method for the optical composite lead-in wire 10, the pipes 4 for inserting the optical fiber units 3 composed of the coated optical fibers are longitudinally attached along the lengthwise direction of the low-voltage lead-in wire 2 for electric power composed by intertwining the plural insulated cores 1, and the pipes 4 are bundled with the low-voltage lead-in wire 2 for electric power by winding at least one binding wire 5 along the lengthwise direction of the low-voltage lead-in wire 2 for electric power and the pipes 4.

4. 发明专利

JP2000111770A SPACER FOR OPTICAL FIBER CABLE AND OPTICAL FIBER CABLE UTILIZING THIS SPACER 失效
公开(公告)号：JP2000111770A
公开(公告)日：2000-04-21
申请号：JP30044998
申请日：1998-10-07
申请人： FURUKAWA ELECTRIC CO LTD , CHUBU ELECTRIC POWER
发明人： TAKAHASHI SEIICHIRO , HIRAMATSU HIDEYO , HARA MASAMI , KAMATA YOSHIYUKI , OTOSU SOICHIRO , TANAKA SHINICHI
IPC分类号： G02B6/44
摘要： PROBLEM TO BE SOLVED: To relieve the elongation strain of coated optical fibers. SOLUTION: Grooves 2 for housing the coated optical fibers disposed at the spacer 1 constitute S-Z grooves alternately continuously formed with S-shaped groove parts which meander to an S-shape in the longitudinal direction of the spacer 1 and Z-shaped groove parts which meander to an approximately Z shape. Inter-groove filamentary bodies 12 are provided between S-Z grooves. Inter-groove filamentary bodies 12 are formed of materials having the coefficient of longitudinal elasticity higher than the coefficient of longitudinal elasticity in the forming regions of the S-Z grooves 2 and the forming regions of the S-Z grooves 2 are formed of materials having the coefficient of transverse elasticity smaller than the coefficient of transverse elasticity of the materials of the inter-groove filamentary bodies 12. When tension is applied on the spacer 1 and elongation occurs therein, the force in the direction where the meandering shape is deformed to a straight shape is acts on the inter-groove filamentary bodies 12, by which the S-Z grooves 2 are deformed to a direction advancing for the straight shape. The elongation rate of the S-Z grooves 2 is suppressed and the tension acting on the coated optical fibers is decreased, by which the elongation strain of the coated optical fibers is relieved.

5. 发明专利

JPH10206706A OPTICAL CABLE AND OPTICAL CABLE LINE USING THE SAME 失效
公开(公告)号：JPH10206706A
公开(公告)日：1998-08-07
申请号：JP733197
申请日：1997-01-20
申请人： FURUKAWA ELECTRIC CO LTD
发明人： ISHIKAWA AKIHIKO , KAMATA YOSHIYUKI , MIZOTA YOSHIAKI
IPC分类号： G02B6/44 , G02B6/00
摘要： PROBLEM TO BE SOLVED: To suppress the external diameter of the cable relatively small even when the cable contains more than one coated optical fiber and to enable postbranching from any coated optical fiber. SOLUTION: A cable core 1 is divided into a center part 1a and an outer peripheral part 1b. At the center part 1a, coated optical fibers 7 are gathered by unidirectional stranding for high density. At the outer peripheral part 1b, the coated optical fibers 17 are gathered by SZ stranding for postbranching. The optical cable line is constituted including this optical cable. A coated optical fiber 7 of the center part 1a 1s connected to a coated optical fiber 17 of the outer peripheral part 1b at some cable connection part in the line direction. Consequently, postbranching from any coated optical fiber is enabled.

6. 发明专利

JPH06324226A WAVEGUIDE DEVICE AND ITS PRODUCTION 失效
公开(公告)号：JPH06324226A
公开(公告)日：1994-11-25
申请号：JP10916693
申请日：1993-05-11
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KAMATA YOSHIYUKI , YANAGAWA HISAHARU
IPC分类号： G02B6/13 , G02B6/12
摘要： PURPOSE:To lessen connection loss by forming specific grooves by dry etching near the connecting surface of a first waveguide part. CONSTITUTION:Only the points 6a, 6b corresponding to connecting surfaces at the time of butt connection are exposed at a desired width and the other surface parts are coated with a resist 7. After the surface over the entire part is subjected to dry etching, the resist 7 is peeled away. Consequently, only the constituting material of the thin-film body existing right under the exposed surfaces 6a, 6b is etched away and the grooves 8 are so formed as to enclose the first waveguide part A to be formed. The grooves 8 are so formed as to have the depth at which the grooves penetrate the entire part of the core layer 4 and further arrive at the point lower than the front surface 2a of a common lower clad 2 existing thereunder. Then, the dry etching surfaces A1, A2 in the first waveguide part A are formed as perpendicular surfaces which are both flat from the surface of the gap layer 6 clown to the desired depth of the common clad 2.

7. 发明专利

JPH06102544A OPTICAL CIRCUIT 失效
公开(公告)号：JPH06102544A
公开(公告)日：1994-04-15
申请号：JP25016992
申请日：1992-09-18
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KAMATA YOSHIYUKI , YANAGAWA HISAHARU
IPC分类号： G02B6/122 , G02B6/12 , G02F1/313 , H01S3/10
摘要： PURPOSE:To enable the changeover of optical paths without generating the light emission to act as a noise at the time of a switching operation by constituting the current implantation part of a waveguide of an indirect transition type compd. CONSTITUTION:A buffer layer 12, a lower clad layer 13, a core layer 14, an upper clad layer 15 and a cap layer 16 are successively formed on a substrate 11. Both of the core layer 14 and the clad layer 15 are constituted of the indirect transition type compd. Zn is diffused into the switch current implantation part 17. The upper clad layer 15 and the cap layer 16 are etched in such a manner that the waveguide remains. An insulating layer 18 consisting of SiO2 is deposited over the entire surface and an upper electrode 19 is formed. A lower electrode 20 is formed on the rear surface, by which the waveguide type optical switch is completed. Since the current implantation part 17 of the waveguide is constituted of the indirect transition type compd. in such a manner, the current implantation part doe not emit light at the time of the switching operation.

8. 发明专利

JPH0695175A 4-PORT OPTICAL SWITCH 失效
公开(公告)号：JPH0695175A
公开(公告)日：1994-04-08
申请号：JP24608092
申请日：1992-09-16
申请人： FURUKAWA ELECTRIC CO LTD
发明人： BAKU KANMEI , KAMATA YOSHIYUKI , YANAGAWA HISAHARU
IPC分类号： G02B6/12 , G02F1/313
摘要： PURPOSE:To provide a semiconductor 4-port optical switch capable of swishing a through state, a cross state and a loop back state, small in insersion loss and excellent in cross-talk characteristic as well. CONSTITUTION:This optical switch is the 4-port optical switch so that one side WG2d, WG3c of the output side blanch optical port of other optical switch elements SW2, SW3 are connected optically to one side WG1a, WG1b of the input side optical ports of an X cross type optical switch element AW1 respectively, and the other side WG2c, WG3d of the output side blanch optical port of the optical switch elements SW2, SW3 are connected optically to each other through optical path revision elements RM., RM2, and the input side optical port WG2a, WG3b of the optical switches SW2, SW3 and the output side optical ports WG1C, WG1D of the X cross type optical switch element are connected optically to total optical ports P1-P4 through semiconductor optical amplifier elements AM1-AM4 respectively.

9. 发明专利

JPH05210127A TOTAL REFLECTION TYPE OPTICAL WAVEGUIDE SWITCH 失效
公开(公告)号：JPH05210127A
公开(公告)日：1993-08-20
申请号：JP27151592
申请日：1992-10-09
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KAMATA YOSHIYUKI , YANAGAWA HISAHARU
IPC分类号： G02B6/12 , G02F1/313
摘要： PURPOSE:To provide the total reflection type semiconductor optical switch which is low in initial crosstalks. CONSTITUTION:The refractive index changing region 4 of the total reflection type optical waveguide switch which has optical waveguides 1, 2 intersecting with each other and is formed with the refractive index changing region 4 for producing a reflection surface 4b of light in the intersected part 3 thereof is formed to such a shape that the reflection surface 4b produced therein constitutes a curved surface recessed from the one side part of the intersected part 3. The incident light on the point corresponding to the reflection surface 4b is dull with a change in the refractive index in the refractive index changing region 4 when the refractive index changing region 4 is not operated. The initial crosstalks are, therefore, decreased.

10. 发明专利

JPH04362609A OPTICAL SWITCH 失效
公开(公告)号：JPH04362609A
公开(公告)日：1992-12-15
申请号：JP13919791
申请日：1991-06-11
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KAMATA YOSHIYUKI , YANAGAWA HISAHARU
IPC分类号： G02B6/26 , G02B26/08
摘要： PURPOSE:To provide the optical switch which can be manufactured efficiently to small size and is adaptive to various kinds of nXm switch. CONSTITUTION:The optical switch is equipped with an optical connector 1 formed by inserting plural optical fibers 10 at specific intervals so that their fiber end surfaces are exposed and an optical waveguide 2 which has a waveguide circuit 11 for connecting at least two of the optical fibers 10 of the optical connector 1 while a circuit end surface of the waveguide circuit 11 is exposed. Optical fibers 10 are connected through the waveguide circuit 11 by connecting a fiber end surface to the circuit end surfaces in 1st combination and the fiber end surface and the circuit end surface are connected in 2nd combination by moving at least one of the optical connector 1 and optical waveguide 2 to the other along the connection end surface to connect the optional optical fiber 10 selectively through the waveguide circuit 11.

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