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71. 发明专利

JPH04212109A WAVEGUIDE TYPE LIGHT BRANCHING ELEMENT 失效
公开(公告)号：JPH04212109A
公开(公告)日：1992-08-03
申请号：JP6180891
申请日：1991-03-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAGI AKIHIRO , KAWACHI MASAO , JINGUJI KANAME
IPC分类号： G02B6/122 , G02B6/125 , G02B6/28 , G02B6/34
摘要： PURPOSE:To offer a waveguide type light branching element relaxing wavelength dependency of a power coupling rate. CONSTITUTION:Two optical waveguide paths 1a and 1b are arranged on a substrate 1, and some parts of them are made adjacent to each other, and a tapered directional coupler 2 which is symmetrical to a center line and to a point, or which is not symmetrical to the center line and to the point is installed so as to relax the wavelength dependency of the power coupling rate.

72. 发明专利

JPH04116607A OPTICAL DEMULTIPLEXER 失效
公开(公告)号：JPH04116607A
公开(公告)日：1992-04-17
申请号：JP23836390
申请日：1990-09-07
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOGA MASABUMI , MATSUMOTO TAKAO , TAKAHASHI HIROSHI , KAWACHI MASAO
IPC分类号： G02B6/12 , G02B6/293 , G02B6/34 , H04B10/00 , H04B10/27 , H04Q3/52
摘要： PURPOSE:To eliminate the need of a bulk type lens, to facilitate optical coupling and to accomplish high resolution in a short focal distance by using an array waveguide type diffraction grating as an optical conversion device. CONSTITUTION:When a wavelength multiple signal light is demultiplexed by an optical demultiplexer in which the optical conversion device and a neural network 9 are used, the array waveguide type diffraction grating 11 is used as the optical conversion device. After the wavelength multiple signal light 2 propagated through an optical fiber 1 is radiated to a sectional slab waveguide 13, it is propagated through an array waveguide 12 and converged on the end 15 of a slab waveguide 14 on an output side. The converged signal light is converted into an electrical signal 8 by a photodetector array 7 such as a photodiode array, and then it is discriminated by the neural network 9 whose internal state is previously set and demultiplexed. Thus, the bulk type lens is not necessitated, the high resolution is accomplished, as a result, wavelength multiple number is increased.

73. 发明专利

JPH0430107A WAVEGUIDE TYPE OPTICAL STAR COUPLER 失效
公开(公告)号：JPH0430107A
公开(公告)日：1992-02-03
申请号：JP13548290
申请日：1990-05-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI HIROSHI , KAWACHI MASAO , SUGITA AKIO
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To obtain a small-sized waveguide type optical star coupler which has a large distribution number and has the high uniformity of branch ratio by making an optical waveguide to constitute a pitch conversion optical waveguide group into a pseudo single mode optical waveguide a little wider than a single mode waveguide in its width, and an addition, setting its munimum radius of curvature smaller than the minimum radius of curvature of the single mode optical waveguide in a Y-type optical branch waveguide group. CONSTITUTION:An input wavguide 2, the Y-type branch waveguide group 3, a width conversion waveguide group 4, a pitch converison waveguide group 5, and plural output waveguide arrays 6 are arranged on a silicon substrate 1, and are connected in order. The input waveguide 2 and the y-type branch waveguide group 3 are constitut ed of quartz type single mode optical waveguides, and the pitch conversion waveguide group 5 and the output waveguide array 6 are constituted of quartz type pseudo single mode optical waveguides a little wider in their widths. Since plural modes can exist in the pseudo single mode waveguide, an unnecessary mode is excited at the time of propagation at a curved part. Then, a tapered shaped width conversion waveguide is arranged between the single mode waveguide and the pseudo single node waveguide different form each other in their widths, and a connection loss is suppressed.

74. 发明专利

JPH0328119B2 失效
公开(公告)号：JPH0328119B2
公开(公告)日：1991-04-18
申请号：JP19627981
申请日：1981-12-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI MORIO , NODA JUICHI , KAWACHI MASAO , OKAMOTO KATSUNARI , TERUI HIROSHI
IPC分类号： H04Q3/52

75. 发明专利

JPH02232631A WAVEGUIDE TYPE OPTICAL SWITCH 失效
公开(公告)号：JPH02232631A
公开(公告)日：1990-09-14
申请号：JP5286689
申请日：1989-03-07
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KAWACHI MASAO , JINGUJI KANAME , TAKAGI AKIHIRO , TAKATO NORIO
IPC分类号： G02B6/122 , G02B6/12 , G02F1/313
摘要： PURPOSE:To obtain the waveguide type optical switch scarcely having wavelength dependency by using a Mach-Zehnder optical interferometer circuit type 3dB optical coupler, which is constituted by coupling two directional couplers by optical waveguides with slightly different length, as an element, and constituting a circuit type optical switch with phase shifters. CONSTITUTION:Two 3dB optical couplers as elements of the Mach-Zehnder type optical switch are constituted in the configuration of a Mach-Zehnder optical interferometer circuit and the optical path difference of the circuit is set a little bit shorter (nearly 1mum) than the short-wavelength end of an in-use wavelength range. Namely, the 3dB optical couplers 22 and 23 themselves are constituted by coupling the two directional couplers 22a and 22b, and 23a and 23b each by two optical waveguides 22c and 22d, and 23c and 23d each, and such a coupled waveguide is supplied with an optical path length difference of nearly 1mum; and those two 3dB optical couplers 22 and 23 are coupled by two optical waveguides 24 and 25 equipped with phase shifters to obtain desired optical switch constitution on the whole. Consequently, the waveguide type optical switch which operates while scarcely having wavelength dependency in a desired wavelength of, for example, 1.3 - 1.44mum.

76. 发明专利

JPH02211406A OPTICAL WAVEGUIDE WITH FIBER GUIDE GROOVE AND ITS MANUFACTURE 失效
公开(公告)号：JPH02211406A
公开(公告)日：1990-08-22
申请号：JP3222389
申请日：1989-02-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA YASUBUMI , KAWACHI MASAO , KOMINATO TOSHIMI
IPC分类号： G02B6/30 , G02B6/12 , G02B6/122 , G02B6/13
摘要： PURPOSE:To form the fiber guide groove in a buried type optical waveguide by using an Si substrate which has a recessed part and a projection part on the surface, and forming an optical waveguide in the recessed part and the fiber guide groove in the projection part. CONSTITUTION:The Si substrate 1 has the recessed part 1b and projection part 1a formed on the surface, a buffer layer 2b is formed on the recessed part 1b, and its top surface is the same in level with the top surface of the projection part 1a. On the buffer layer 2b, an optical waveguide core layer 2a and a clad layer 2c are formed and at the Si substrate projection part 1a nearby the end part of the optical waveguide core layer 2a, the fiber guide groove 4 for the positioning between an optical fiber and an optical waveguide 2 is formed so that the Si substrate surface is exposed. Thus, the fiber guide groove 4 is formed in the projection part 1a, so a fiber guide groove pattern and an optical waveguide pattern are formed at the same time by using one photomask and the fiber guide groove to the buried type optical waveguide can be formed.

77. 发明专利

JPH02199406A WAVEGUIDE TYPE OPTICAL ISOLATOR 失效
公开(公告)号：JPH02199406A
公开(公告)日：1990-08-07
申请号：JP2032689
申请日：1989-01-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI MORIO , KAWACHI MASAO
IPC分类号： G02B6/12 , G02B27/28
摘要： PURPOSE:To obtain the high-performance practical waveguide type optical isolator which requires no waveguide type nonreciprocal mode converting circuit by arranging a 1st TE-mode passing filter, a Faraday rotator, a reciprocal mode converting circuit, and a 2nd TE-mode passing filter in order from the incidence side of light. CONSTITUTION:Incident light S1 in a random polarized state is made incident on the core 20a of one quartz-based optical waveguide 20 and only propagated light in TE mode is passed through the 1st TE-mode passing filter 21 and made incident on the Faraday rotator 30. Here, the light has the plane of polarization rotated clockwise by 45 deg. and is made incident on the waveguide type reciprocal mode converting circuit 22, where the light has the plane of polarization rotated counterclockwise by 45 deg. to become the propagated light in TE mode in the same polarized state with the propagated light passed through the 1st filter 21; and the light is passed through the 2nd TE-mode passing filter 23 as it is and projected from the other end surface as projection light S0. Even if there is return light SR in a random polarized state from the opposite direction, this light is not projected from the optical isolator.

78. 发明专利

JPH0228852B2 失效
公开(公告)号：JPH0228852B2
公开(公告)日：1990-06-26
申请号：JP16791281
申请日：1981-10-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI MORIO , KAWACHI MASAO , TERUI HIROSHI , NODA JUICHI , EDAHIRO TAKAO
IPC分类号： G02B6/12 , G02F1/03 , G02F1/313 , G02F1/315

79. 发明专利

JPH02157805A OPTICAL WAVEGUIDE WITH GUIDE AND ITS MANUFACTURE 失效
公开(公告)号：JPH02157805A
公开(公告)日：1990-06-18
申请号：JP31190988
申请日：1988-12-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA YASUBUMI , KAWACHI MASAO , KOMINATO TOSHIMI , OMORI YASUJI
IPC分类号： G02B6/122 , G02B6/30 , G02B6/36
摘要： PURPOSE:To connect a self-alingment fiber to an optical waveguide in a embedded structure by dividing a fiber connecting guide into a first guide used for the positioning of the optical waveguide path and an optical fiber and a second guide for the fixation of the optical fiber. CONSTITUTION:A groove to house an optical fiber 4 is engraved on the surface layer part of a substrate 1, and guides 3 respectively consisting of a first guide 3a and a second guide 3b are attached on the walls positioned on the both sides of the groove, and the optical fiber 4 is fixed by the guides 3. That is, the height of a top face 31 of the first guide 3a is set at the same height as the top face of a core part 4a in the optical fiber 4, and a distance W, which the guide 3a faces, is set approximately the same as a diameter D of the optical fiber 4. Further, a height H from the guide surface to the center of a core part 2a positioned between the guides 3a and 3b is set approximately the same as a radius D/2 of the optical fiber 4. Thus, only by embedding the optical fiber 4 to the groove, the optical fiber 4 makes contact with the three points of the substrate 1 and the guides 3.

80. 发明专利

JPH02125208A OPTICAL WAVEGUIDE AND OPTICAL FIBER CONNECTING CONNECTOR 失效
公开(公告)号：JPH02125208A
公开(公告)日：1990-05-14
申请号：JP27743988
申请日：1988-11-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KAWACHI MASAO , TAKATO NORIO , KOBAYASHI SOICHI , NAKAHARA MOTOHIRO , SATAKE TOSHIAKI
IPC分类号： G02B6/30 , G02B6/42
摘要： PURPOSE:To attach and detach an optical fiber plug to and from an optical waveguide substrate repeatedly without being limited to a guide pin interval by providing two guide pin fixation grooves provided to the substrate directly, the guide pins fixed in the fixation grooves, and the optical fiber plug which has guide pin storage holes. CONSTITUTION:The guide pin fixation grooves 24 are formed directly in the optical waveguide substrate 21, so even when the width of the substrate 21 is large, the guide pins 23 are installed without increasing the interval between the guide pins 23. The optical fiber plug 26 has the two parallel storage holes 28 for receiving the guide pins by storing the terminal 27 of an input/output optical fiber in a holder 29. The guide pins 23 are inserted into the guide pin storage holes 28 to connect an optical waveguide terminal 22 to the optical fiber terminal 27 automatically detachably. Consequently, the input/output optical fiber can be fitted detachably to a large-size waveguide type optical component which can not be connected before.

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