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1. 发明专利

JP2001203757A COMMUNICATION SYSTEM 失效
公开(公告)号：JP2001203757A
公开(公告)日：2001-07-27
申请号：JP2000017786
申请日：2000-01-21
申请人： FURUKAWA ELECTRIC CO LTD
发明人： UEKI TAKESHI
IPC分类号： H04J3/14 , H04L12/707 , H04L29/14 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To provide a communication system which can appropriately cope with a trouble when the trouble occurs in an arbitrary external connection unit when a signal is transmitted by relaying external connection units connected to plural stations. SOLUTION: Paths being logical communication paths are formed among stations ST1 to ST4 and communication is conducted among the stations ST1 to ST4 by using the pertinent paths. The stations ST1 to ST4 transmit source information specifying a communication source to the other stations which are adjacently connected and detect the presence or absence of the change in communication destination based on source information received from the other station. When the communication destination is changed, the change is informed to routers R1 to R4 connected to the stations.

2. 发明专利

JPH07202800A OPTICAL COUPLING/BRANCHING MODULE 失效
公开(公告)号：JPH07202800A
公开(公告)日：1995-08-04
申请号：JP35419793
申请日：1993-12-28
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YANAGAWA HISAHARU , SHIMIZU TAKEO , UEKI TAKESHI , TOMITA NOBUO
IPC分类号： H04B10/29 , H04B10/07 , H04B10/071 , H04B10/077 , H04B10/2507 , H04B10/27 , H04B10/02 , H04B10/08
摘要： PURPOSE:To provide an optical multiplex/demultiplex module suitable for the optical fiber communication system forming a large circuit network. CONSTITUTION:An optical multiplex/demultiplex module 8 is interposed between an optical transmitter-receiver 1 and an optical connector 6 connecting to an optical line of a telephone subscriber, telephone communication is made via the optical multiplex/demultiplex module 8 and an optical monitor 20 connecting to the optical multiplex/demultiplex module 8 monitors mainly the presence of a fault of the optical line of the telephone subscriber to build up the optical monitor system, then the optical multiplex/demultiplex module 8 is connected to two optical connectors 6 or over, and a guide path chip 10 in which a pattern of optical branching coupling guide paths 7 whose number is the same as the total number of optical fibers 9f arranged in the optical connector 6 is formed is provided to the optical multiplex/demultiplex module 8.

3. 发明专利

JPH06281827A PRODUCTION OF QUARTZ WAVEGUIDE TYPE OPTICAL PARTS 失效
公开(公告)号：JPH06281827A
公开(公告)日：1994-10-07
申请号：JP6793293
申请日：1993-03-26
申请人： FURUKAWA ELECTRIC CO LTD
发明人： UEKI TAKESHI , YANAGAWA HISAHARU , MAINO GURIIN , RICHIYAADO RODONII ANSONII SHI , ANDORIYUU SHIIN HORUMUZU
IPC分类号： G02B6/122 , G02B6/12 , G02B6/13
摘要： PURPOSE:To provide the process for production of the quartz waveguide type optical parts which are small in propagation loss of the waveguides. CONSTITUTION:This process for production of the quartz waveguide type optical parts consists of once subjecting a waveguide core to a heat treatment at a temp. above its softening point prior to the formation of an upper clad at the time of producing the quartz waveguide type optical parts by embedding a waveguide core formed constituting a level difference on the lower clad into the upper clad. This process is particularly effective at the time of being adopted for forming the flash type waveguide by applying a sol-gel method.

4. 发明专利

JPH06102425A PLANE WAVEGUIDE CHIP FOR OPTICAL MULTIPLEXER/ DEMULTIPLEXER MODULE 失效
公开(公告)号：JPH06102425A
公开(公告)日：1994-04-15
申请号：JP25432792
申请日：1992-09-24
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YANAGAWA HISAHARU , SHIMIZU TAKEO , NAKAMURA SHIRO , UEKI TAKESHI , TOMITA NOBUO
IPC分类号： G02B6/122 , G02B6/12 , G02B6/28 , G02B6/30
摘要： PURPOSE:To provide a plane waveguide chip for an optical multiplxer/de- multiplexer module capable of reducing the number of parts required for assembling the optical multiplexer/demultiplexer module, reducing the cost and miniaturizing the module. CONSTITUTION:A multiplexer/demultiplexer part A consisting of plural sets of optical multiplexer/demultiplexer waveguide patterns a1, a2 and wiring parts B1, B2 consisting of plural sets of input/output waveguide patterns b1, b2, b3, b4 connected to the optical multiplexer/demultiplexer waveguide patterns a1, a2 respectively are formed on a flat substrate, and pin inserting guide holes or pin guide grooves 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h connecting other optical parts with a pin are formed on respective input/output terminal parts D1, D2, D3, D4 in the wiring parts B1, B2.

5. 发明专利

JPH05333231A 失效
公开(公告)号：JPH05333231A
公开(公告)日：1993-12-17
申请号：JP13878992
申请日：1992-05-29
申请人： FURUKAWA ELECTRIC CO LTD
发明人： YANAGAWA HISAHARU , SHIMIZU TAKEO , NAKAMURA SHIRO , UEKI TAKESHI
IPC分类号： G02B6/30 , G02B6/42
摘要： PURPOSE:To align and easily connect the optical fiber and optical waveguide to each other. CONSTITUTION:For the method for connecting the optical waveguide formed on a waveguide substrate B2 with optical fibers 9 and 9, and 9 and 9 arrayed on optical fiber array tools b1 and b3 by making end surfaces of the waveguide substrate B2 and end surfaces of the optical fiber array tools b1 and b2 on each other, markers 2 and 2 which extend coaxially in the direction of optical axes when the waveguide substrate B2 and optical fiber array tools b1 and b3 are made to abut on each other and pin guide grooves 6 and 6 cut based on the markers 2 and 2 are formed in the waveguide B2 and optical fiber array tools b1 and b3; and optical fiber guide grooves 7 and 7 cut bared on the markers 2 and 2 are formed in the optical fiber array tools b1 and b3 and when the waveguide substrate B2 and optical fiber array tools b1 and b3 are made to abut on each other, common guide pins 8 and 8 are put in the pin guide grooves 6 and 6 to align the optical waveguide with the optical fibers 9 and 9, and 9 and 9.

6. 发明专利

JPH05224054A MANUFACTURE OF QUARTZ GROUP MIRROR WAVEGUIDE 失效
公开(公告)号：JPH05224054A
公开(公告)日：1993-09-03
申请号：JP2800992
申请日：1992-02-14
申请人： FURUKAWA ELECTRIC CO LTD
发明人： OYAMA ISAO , UEKI TAKESHI , NAKAMURA SHIRO , SHIMIZU TAKEO , YANAGAWA HISAHARU
IPC分类号： G02B6/13 , G02B6/12
摘要： PURPOSE:To provide a manufacturing method of a quartz group mirror waveguide with high arrangement accuracy for the mirror. CONSTITUTION:When the mirror is formed at a folding back part 4a of a quartz group folding back waveguide 4 which is embedded in a quartz group clad on which a mask layer 10 is formed with aligning patterns 6 for formation of the mirror as reference, only the parts 14, 14' just above the aligning patterns in the mask layer 10 are carried out with an etching treatment in a state of without forming mask to form a slit for mirror. Subsequently a material for mirror is applied on the slit for mirror to form the mirror. Consequently since the mask layer 10 of a high reflective material is not present just above the aligning pattern, visual recognition of the aligning pattern is easily performed from that place and the positioning is carried out with high accuracy.

7. 发明专利

JPH0527132A PRODUCTION OF WAVEGUIDE TYPE OPTICAL PARTS 失效
公开(公告)号：JPH0527132A
公开(公告)日：1993-02-05
申请号：JP18465891
申请日：1991-07-24
申请人： FURUKAWA ELECTRIC CO LTD
发明人： UEKI TAKESHI , YANAGAWA HISAHARU
IPC分类号： G02B6/13
摘要： PURPOSE:To provide the waveguide type optical parts having small propagation losses. CONSTITUTION:A lower clad layer 2 consisting of quartz glass is formed on a substrate 1. An antistatic layer and a mask layer having desired patterns are formed in this order on the surface of a lower clad part 2 and are irradiated with an electron beam from above the mask layer to form core parts 6 of desired patterns within the lower clad layer 2. The mask layer and the antistatic layer are removed to expose the surface of the lower clad layer 2. Further, an upper clad part 7 having the refractive index lower than the refractive index of the core parts 6 is formed on the exposed surface of the lower clad part 2. The surface of the entire part and the core parts 6 are parted in this way and, therefore, the scattering losses based on the microruggedness on the surface are decreased and the waveguide type optical parts having the small propagation losses are produced inexpensively.

8. 发明专利

JPH03186821A OPTICAL SWITCH 失效
公开(公告)号：JPH03186821A
公开(公告)日：1991-08-14
申请号：JP32695689
申请日：1989-12-15
申请人： FURUKAWA ELECTRIC CO LTD
发明人： UEKI TAKESHI , YANAGAWA HISAHARU
IPC分类号： G02B6/122 , G02B6/12 , G02F1/313
摘要： PURPOSE:To obtain the optical switch having respectively two pieces of optical waveguides on input and output sides by forming the switch of two pieces of the semiconductor optical waveguides intersecting at a specified intersecting angle and providing refractive index control parts respectively in the semiconductor optical waveguides near the intersected part. CONSTITUTION:This switch is formed of two pieces of the semiconductor optical waveguide parts D1 to D4 intersecting with each other at the intersection angle theta deg.(where theta

9. 发明专利

JPH0381706A DELTABETA TYPE OPTICAL DIRECTIONAL COUPLER 失效
公开(公告)号：JPH0381706A
公开(公告)日：1991-04-08
申请号：JP21740089
申请日：1989-08-25
申请人： FURUKAWA ELECTRIC CO LTD
发明人： OYAMA ISAO , NAKAMURA SHIRO , UEKI TAKESHI , YANAGAWA HISAHARU
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To decrease the light losses in junctures at the time of imparting a propagation constant difference to waveguides by connecting the waveguide parts which are the same in the height of the waveguides and vary in width from each other in such a manner that the optical axes thereof align to each other. CONSTITUTION:The waveguide 11 has the prescribed width and height. The waveguide 12 is constituted by connecting the waveguide part 12a which has the width and height equal to the width and height of the waveguide 11, the waveguide 12b which has the height equal to the height of the waveguide 11 and has a broader width, and the waveguide 12c which is the same in shape as the shape of the part 12a. The optical axes of the respective waveguide parts are aligned to each other in the junctures 12e, 12f of the respective wavegyuide parts in this waveguide 12. The light losses in them junctures are decreased at the time of imparting the propagation constant difference to the waveguide. The same holds true of the coupler having the constitution which is the same in the width and varies in the height.

10. 发明专利

JPH0233134A OPTICAL SWITCH 失效
公开(公告)号：JPH0233134A
公开(公告)日：1990-02-02
申请号：JP18385388
申请日：1988-07-22
申请人： FURUKAWA ELECTRIC CO LTD
发明人： UEKI TAKESHI , KAMATA YOSHIYUKI , YANAGAWA HISAHARU
IPC分类号： G02F1/313 , H04B10/00 , H04B10/27
摘要： PURPOSE:To form a p-n junction between a core layer and a semiconductor layer as a continuous growth surface and to suppress a diffusion to the core layer side of n type impurities by forming a p type semiconductor layer positioned on the upper face of an n type semiconductor core layer by epitaxial growth. CONSTITUTION:On an n type semiconductor substrate 1 on which the lower electrode 11 has been formed, an n type semiconductor lower clad layer 13 and an n type semiconductor core layer 14 are laminated successively. On this core layer 14, a p type semiconductor thin layer 15 is formed, and also, the upper clad layer 16 and a p type semiconductor cap layer 17 whose refractive index is the same as that of the thin layer 15 are brought to continuous growth. Subsequently, by executing photolithography and a wet etching processing, a ridge corresponding to waveguides A-D is formed, and thereafter, an insulating thin film 18 is formed and covered thereon. In the end, a window 18a is pierced in a prescribed part of the insulating thin film 18, and by diffusing Zn from this window 18a by a vapor phase diffusing method, a p type impurity area 10 is formed in a part of the clad layer 16 and the cap layer 17, and the continuity of a p-n junction surface is secured.

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