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1. 发明专利

JP2002350697A OPTICAL FIBER RIBBON AND METHOD OF SEPARATING GLASS FIBER THEREOF 失效
公开(公告)号：JP2002350697A
公开(公告)日：2002-12-04
申请号：JP2001159804
申请日：2001-05-29
申请人： JSR CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： SUGIMOTO MASANOBU , TAKAHASHI MASANOBU , SUGIMOTO HIDEKI , MIYAZAWA HIROSHI , HOKARI KAZUO
IPC分类号： G02B6/44 , G02B6/00 , H01B7/00 , H01B11/00
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber ribbon which has sufficient strength, can be easily cut over the entire width thereof in branching and connecting and permits taking out of necessary optical fibers. SOLUTION: The optical fiber ribbon formed by taping and coating a plurality of optical fibers respectively coated with fiber coatings, in which the tape layers have a notch sensitivity (S) of (1 to 20) MPa.mm [where the notch sensitivity (S) is the value measured and calculated by the following method. Namely, a notch is formed on one side of the central part on the long side of a cured film with a long side 25 mm and width 10 mm, and the tensile breaking strength in the longitudinal direction thereof is measured and a breaking stress (H) is calculated from the resultant breaking strength and initial sectional area. The notch sensitivity is the value determined by S=(H1 -H2 )/((1/a1 )-(1/ a2 )) (1) when the breaking stresses are H1 and H2 when the notch lengths are a1 and a2 ], and the Young's modulus of 800 to 1,500 MPa, and a method of separating glass fibers therefrom is given.

2. 发明专利

JP2000028979A OPTICAL CONTROL ELEMENT INDEPENDENT OF POLARIZATION 失效
公开(公告)号：JP2000028979A
公开(公告)日：2000-01-28
申请号：JP19783498
申请日：1998-07-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIYAZAWA HIROSHI , MITOMI OSAMU , NOGUCHI KAZUTO
IPC分类号： G02B6/12 , G02F1/035
摘要： PROBLEM TO BE SOLVED: To provide an optical control element which has a low driving voltage and is independent of the polarization state of input light. SOLUTION: In this optical control element, plural optical waveguides 2 formed in the vicinity of the surface of an optical substrate 1 having an electrooptic effect and plural electrodes 3 arranged on the optical substrate surface where plural optical waveguides are formed are provided, and mutual action areas between optical waveguides 2 and plural electrodes 3 are formed by a voltage induced by applying a microwave to plural electrodes 3, and a polarization conversion part which practically rotates the plane of polarization of light at about 90 deg. is provided in at least one of plural optical waveguides 2. This optical control element is provided with at least a pair of electrodes for phase difference adjustment other than plural electrodes 3, to which the microwave is applied, on plural optical waveguides 2.

3. 发明专利

JPH11167032A CURVED OPTICAL WAVEGUIDE CIRCUIT 失效
公开(公告)号：JPH11167032A
公开(公告)日：1999-06-22
申请号：JP33258897
申请日：1997-12-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MITOMI OSAMU , MIYAZAWA HIROSHI , NOGUCHI KAZUTO
IPC分类号： G02B6/122
摘要： PROBLEM TO BE SOLVED: To provide a curved optical waveguide circuit small in size and low in loss. SOLUTION: The light emitted from a light guide part 103 is reflected by a reflecting groove 105 and recoupled with the light guide part 103 by arranging the reflecting groove 105 which has a reflecting function across a gap (g) at the outer peripheral part of the curved light guide part 103 continued through both end parts of an input/output waveguide 102 to/from which an input/output light entering/outgoing.

4. 发明专利

JPH1188299A TIME MULTIPLEXED OPTICAL CIRCUIT 失效
公开(公告)号：JPH1188299A
公开(公告)日：1999-03-30
申请号：JP24508397
申请日：1997-09-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIYAZAWA HIROSHI , NOGUCHI KAZUTO , MITOMI OSAMU
IPC分类号： H04J14/08 , H04J3/00
摘要： PROBLEM TO BE SOLVED: To obtain a time multiplexed optical circuit of a small loss and a small size by inserting a TM/TE mode conversion circuit into at least one route among routes from a branch circuit to a wave synthesizing circuit so as to constitute a time delay circuit. SOLUTION: For example, a light input pulse train 31 is incident by a TM mode, divided into first and second routes 18 and 19 at the Y branching part of a Y branch circuit 13 and the light pulse trains are modulated by the modulation part of each. A pulse train 33 is transformed from a TM mode to a TE mode at the first route 18. A pulse train 34 is wave-synthesized by keeping the TM mode at the second route 19 on the other hand. At each mode propagating a delay circuit 15, time delay at the time of emitting varies depending on the propagating constant difference between them. At the time of properly setting the length of the waveguide of the circuit 15 between the pulse trains including a time delay difference at a Y branch wave synthesizing circuit 16 so as to overlap the other pulse train, the light pulse train 35 (TM&TE coexisting) of a light output 20 provided with a double transmission rate is made.

5. 发明专利

JPH09297289A OPTICAL CONTROL DEVICE AND OPERATING METHOD THEREFOR 失效
公开(公告)号：JPH09297289A
公开(公告)日：1997-11-18
申请号：JP11377896
申请日：1996-05-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MITOMI OSAMU , MIYAZAWA HIROSHI , NOGUCHI KAZUTO
IPC分类号： G02F1/03 , G02F1/035
摘要： PROBLEM TO BE SOLVED: To obtain an optical control bias structure capable of a high-peed operation with a low driving voltage by constituting at least one side of the center conductor or the grounding conductor of an electrode with a plurality of conductor layers of two layers or more layers by interposing the insulated layer of at least one layer. SOLUTION: Modulation electrodes are constituted of conductors of two layers or more layers by interposing insulated layers 110 like polyimide, epoxy, etc., made sufficiently thin. The insulated layers 110 are interposingly mounted in between the lower center conductor 104 and the lower grounding conductor 105 and in between the upper center conductor 111 and the upper grounding conductor 112 of an LiNbO3 substrate 101 side and electric insulations are attained by these insulated layers 110 in a DC and electric couplings are attained in a microwave via the capacitance between lower and upper electrodes to be formed by the insulated layers 110. Moreover, a material whose dielectric constant and refractive index are small with respect to the LN like SiO2 or polymide, etc., is selected as a buffer layer 103.

6. 发明专利

JPH08224212A ENDOSCOPE 失效
公开(公告)号：JPH08224212A
公开(公告)日：1996-09-03
申请号：JP3501595
申请日：1995-02-23
申请人： NIPPON TELEGRAPH & TELEPHONE , JAPAN BROADCASTING CORP
发明人： HARADA YASUHIRO , MIYAUCHI MITSURU , MIYAZAWA HIROSHI
IPC分类号： G02B23/24 , A61B1/00 , A61B1/04 , G02B23/26
摘要： PURPOSE: To easily distinguish the rugged part of a lesion from other parts in the observation of the wall of the stomach, etc., by employing such constitution that a video for stereoscopic vision is displayed based on every piece of video information from a first video input part and a second video input part arranged by separating from each other. CONSTITUTION: A flexible cable 2 inserted from the mouth to the stomach of a patient 1 is composed in such a way that its tip on a stomach side is formed as a video input part 3, and it comprises the first video input part 3A and the second video input part 3B separated from each other. Light outputted via each optical fiber in the cable 2 is inputted to an optic/electric signal converter 7, and converted to an electrical signal (video signal) in accordance with the intensity of the light, and inputted to a display device 8. The video from the first video input part 3A and the one from the second video input part 3B are recognized by both eyes 13A, 13B of an observer 12 at nearly same time via a lenticular lens on a display surface 8A. In this way, the observer 12 obtains the stereoscopic vision of an image-picked up video via the display device 8.

7. 发明专利

JPH05289032A 失效
公开(公告)号：JPH05289032A
公开(公告)日：1993-11-05
申请号：JP9314492
申请日：1992-04-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIYAZAWA HIROSHI , MITOMI OSAMU
IPC分类号： G02F1/035 , G02F1/025
摘要： PURPOSE:To suppress the fluctuation of an operating point due to DC drift phenomenon in a short term and to stabilize a following operating point by controlling the operating point of an optical device by making bias control light incident on the optical waveguide of the optical device. CONSTITUTION:The operating point of the optical device can be controlled by making the bias control light 111 incident on at least one of the optical waveguides 101, 102 formed on or in the neighborhood of a substrate plane provided with an electro-optical effect and a photoconductive effect, and the optical waveguides 101, 102 of the optical device provided with electrodes 103, 104 arranged in the neighborhood of the optical waveguides. Voltages induced on the optical waveguides 101, 102 can be shifted from initial values to a voltage value equivalent to the voltage value when a long term elapses in a short time, and the fluctuation quantity of a bias voltage after initial fluctuation can be suppressed to nearly zero. Therefore, since it is possible to reduce a control range In the locking control of the operating point, an operation can be stabilized.

8. 发明专利

JPH04355714A OPTICAL CONTROL ELEMENT 失效
公开(公告)号：JPH04355714A
公开(公告)日：1992-12-09
申请号：JP13132491
申请日：1991-06-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIYAZAWA HIROSHI , MITOMI OSAMU
IPC分类号： G02B6/12 , G02F1/035 , G02F1/225
摘要： PURPOSE:To offer the optical control element which operates at a high speed with a low driving voltage. CONSTITUTION:Optical waveguides 102, 104, 104', 104'', 104''', and 102' are arranged nearby the surface of an LN substrate 101 and progressive wave electrodes 106 and 107 are arranged on the surface of the substrate 101; and those optical waveguides and progressive wave electrodes are increased in mutual operation length by further providing a mutual operation area R-S by returning light waves and microwaves propagated in them behind a mutual operation area P-Q. Consequently, the driving voltage is made low and the phase speed differences between the light waves and microwaves are compensated to realize the high-speed operation.

9. 发明专利

JPH04304416A FORMATION OF OPTICAL CONTROL ELEMENT 失效
公开(公告)号：JPH04304416A
公开(公告)日：1992-10-27
申请号：JP6860191
申请日：1991-04-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIYAZAWA HIROSHI , MITOMI OSAMU , SUZUKI TOSHIO , NOGUCHI KAZUTO
IPC分类号： G02B6/12 , G02F1/05 , G02F1/313
摘要： PURPOSE:To machine a buffer layer with good controllability and to improve not only characteristics, but also the mass-productivity. CONSTITUTION:The optical control element is equipped with a substrate 101 which has at least one optical waveguide and provides electrooptic effect, the buffer layer 103 arranged on the substrate 101, and an electrode 104 arranged on the buffer layer 103. The electrode 104 is formed on the buffer layer 103, which is etched principally by physical reaction and then etched principally by chemical reaction to shape the buffer layer 103.

10. 发明专利

JPH04288531A OPTICAL SWITCH 失效
公开(公告)号：JPH04288531A
公开(公告)日：1992-10-13
申请号：JP5285291
申请日：1991-03-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KONO KENJI , MIYAZAWA HIROSHI , NOGUCHI KAZUTO
IPC分类号： G02B6/12 , G02F1/035 , G02F1/313
摘要： PURPOSE:To realize a low driving voltage and a wide band without spoiling the coupling between two optical waveguides of a directional coupler, etc., by etching only one side between the two optical waveguides. CONSTITUTION:Only one side between the two optical waveguides 12 is etched to form a single projection part 12A on a nearby substrate 1 between a center electrode 14 and an earth conductor 15. The two directional coupler type optical waveguides 12 are arranged on the one projection part 12A, one of the optical waveguides 12 is arranged right below the center electrode 14 across a buffer layer 13, and the other optical waveguide 12 is arranged right below the earth conductor 15. Thus, no gap is formed between the two optical waveguides 12 by etching only one side between the optical waveguides 12 of the directional coupler, etc., so the coupling between the two optical waveguides 12 is not spoiled and the low driving voltage and wide band are, therefore, obtained.

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