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1. 发明专利

JPS57112722A OPTICAL MODULATOR 失效
公开(公告)号：JPS57112722A
公开(公告)日：1982-07-13
申请号：JP18788880
申请日：1980-12-29
申请人： FUJITSU LTD
发明人： MASUDA SHIGEFUMI , IWAMA TAKEO , NAKASHIMA HIROKI
IPC分类号： G02B6/12 , G02B6/28 , G02F1/29 , G02F1/295
摘要： PURPOSE:To modulate the light in a high speed without requiring the dependency upon the plane of light polarization, by providing an electrode in an electrooptic optical deflecting element to irradiate the light from an optical fiber to an optical modulating element directly through a lens. CONSTITUTION:Two lenses 6 and 6' are installed under an optimum optical coupling condition between a pair of optical fibers, at least, which have end faces are shaped into a recess or projection, for example, between optical fiber bundles 7 and 7' consisting of fiber cores (a) and (b) and fiber cores (c) and (d), respectively, and an electrooptical optical deflecting crystal substrate 5 is installed on the light path between lenses 6 and 6'. When voltages are applied to electrodes 8 and 8' buried in this crystal substrate 5, a refractive index inclination is generated by the density distribution of lines of electric force to deflect the incident light, and thus, the light from the fiber core (a) is made incident to the fiber core (d) or the fiber core (c) to be modulated.

2. 发明专利

JPS57105701A PRODUCTION OF OPTICAL PARTS 失效
公开(公告)号：JPS57105701A
公开(公告)日：1982-07-01
申请号：JP18342180
申请日：1980-12-24
申请人： FUJITSU LTD
发明人： KIYONO MINORU , NAKASHIMA HIROKI , SAWAKI ITSUPEI
IPC分类号： G02B1/10 , C30B33/00 , C30B33/02 , G02B1/14
摘要： PURPOSE:To prevent the change of properties of an optical crystal and to make the manufacture of optical devices of high performance possible by bringing the working surface of an optical crystal body in tight contact with a flat plate which hampers the percolation of the external diffusion material in the optical crystal and applying a heat treatment thereto. CONSTITUTION:Ti for formation of waveguides is deposited by a lift-off method on a thin plate 4 of LiNbO3 disposed on a quartz holder 3 in a diffusion furnace consisting of a quartz tube 1 heated to 1,000 deg.C by an electric furnace 2. An external diffusion material (Li2O) is beforehand vapor-deposited on the holder 3 and when it is heated in tight contact with the surface of a sample 4, the external diffusion material evaporated from the holder 3 side fills the microclearances and this expedites the external diffusion stop of the sample 4. Thereby, the change in the properties of an optical crystal 4 is prevented and the manufacture of the high-performance optical devices is made possible.

3. 发明专利

JPS5788411A FORMING METHOD OF OPTICAL WAVEGUIDE 失效
公开(公告)号：JPS5788411A
公开(公告)日：1982-06-02
申请号：JP16409380
申请日：1980-11-21
申请人： FUJITSU LTD
发明人： KIYONO MINORU , NAKASHIMA HIROKI , SAWAKI ITSUPEI
IPC分类号： G02B6/13 , G02B6/122 , G02B6/134
摘要： PURPOSE:To obtain a waveguide having an optional optical distribution structure, by forming a diffusion substance to a multistage in accordance with a refractive index distribution of a desired waveguide and performing its thermal diffusion, when forming an optical waveguide. CONSTITUTION:A Ti layer 2 of the first stage is obtained by forming the Ti layer on an LiNbO3 substrate 1 by means of vapor-deposition or sputtering, and patterning the Ti layer in accordance with a waveguide. Width of the waveguide is decided by width of the Ti layer 2. Subsequently, a Ti layer 12 of the second stage is formed in the same way by applying a resist on the whole surface and patterning the resist layer. Thereafter, when the substrate 1 is treated by heating for 4-11 hours at 950-1,050 deg.C, a single diffusion part 2' whose refractive index is varied slightly and a double diffusion part 12' whose refractive index is varied remarkably are obtained. In the same way, a multistage diffusion part is formed. In this way, a waveguide having an optional optical distribution structure is obtained.

4. 发明专利

JPS5788410A CROSS WAVEGUIDE AND OPTICAL SWITCH 失效
公开(公告)号：JPS5788410A
公开(公告)日：1982-06-02
申请号：JP16409180
申请日：1980-11-21
申请人： FUJITSU LTD
发明人： KIYONO MINORU , SAWAKI ITSUPEI , NAKASHIMA HIROKI , MIYAUCHI EIZOU
IPC分类号： G02B6/122 , G02F1/313
摘要： PURPOSE:To obtain an optical switch which is operated by low voltage, by providing 1 group or 2 groups of a pair of electrodes on a cross area of a cross waveguide by which an incident light beam formed on an electric optical crystal is wave-directed to the branch side. CONSTITUTION:Cross waveguides 1, 2 having 10mum width, 4mum depth and 2 deg. cross angle are formed by vapor-depositing Ti on an LiNbO3 substrate and executing its thermal diffusion, and Al electrodes 8, 8' and 9, 9' are provided along a main line 1. A distance between the electrodes is set to 4mum, and when voltage of several V - several tens of V is applied, the wave direction to the side of a branch line 2 is obstructed and the wave direction is executed to the main line 1, due to a variation of the refractive index. In this way, an optical switch which is operated by low voltage is obtained.

5. 发明专利

JPS56137317A INTERFERENCE POLARIZER OF MULTIREFLECTION LIGHT 失效
公开(公告)号：JPS56137317A
公开(公告)日：1981-10-27
申请号：JP4077580
申请日：1980-03-28
申请人： FUJITSU LTD
发明人： NAKASHIMA HIROKI , KIYONO MINORU
IPC分类号： G02B5/30 , G02B27/28
摘要： PURPOSE:To enhance separation accuracy by opposedly disposing interference filters in such a manner as to prevent undesired total reflection. CONSTITUTION:Two light polarization filters 1A, 1B used as an interference filter are opposed so as to interpose a material (glass) 5 of a refractive index lower than that of a material of a low refractive index constituting light polarization filters and the back surfaces of these filters 1A, 1B are constituted of materials (glass of a suitable refractive index) 6A, 6B of a suitably high refractive index preventing undesired total reflection, whereby a multiple light interferance polarizer is made. Incident light 7 is entered to this at a suitable angle, and is separated to P wave components (10-1-10-6) and S wave components (8-1-8-5) by multireflection interference polarization, whereby the S wave component output light 9 hardly containing the P wave components is obtained.

6. 发明专利

JPS57200559A APPARATUS AND METHOD FOR FORMING OPTICAL THIN FILM 失效
公开(公告)号：JPS57200559A
公开(公告)日：1982-12-08
申请号：JP8398181
申请日：1981-06-01
申请人： FUJITSU LTD
发明人： MISHIRO EIJI , NAKASHIMA HIROKI
IPC分类号： C23C14/04 , C23C14/54 , G01B11/06 , G02B1/10 , G02B1/11 , G02B1/113
摘要： PURPOSE:To monitor highly precisely the thickness of a dielectric thin film, by providing independently a plurality of shutters so that vapor deposition particles fly independently to a monitor base plate and to a sample base plate. CONSTITUTION:The shutters 12, 13 are positioned such that the deposition stream from a deposition source 5 would reach the transparent monitor base plate 2, but would not reach the sample base plate 4. The transmittance and the reflected light from the transparent monitor base plate 2 are measured by light detectors 9, 10 so that the formation of an optical thin film on the transparent monitor plate 2 is monitored. When their values reach prescribed values, the shutters 12, 13 are moved to positions so that the deposition stream can reach the sample base plate 4.

7. 发明专利

JPS57198836A WAVEGUIDE-TYPE SPECTROSCOPE 失效
公开(公告)号：JPS57198836A
公开(公告)日：1982-12-06
申请号：JP8400881
申请日：1981-06-01
申请人： FUJITSU LTD
发明人： NAKASHIMA HIROKI
IPC分类号： G01J3/12
摘要： PURPOSE:To simplify and minaturize the constitution of a waveguide-type spectroscope by separating a light spectrally into specific wavelength regions by means of waveguide-type optical circuits of intersecding, branching and light directional-property coupling types. CONSTITUTION:Waveguide-type optical circuits of intersecting, branching and light-coupling types are formed of branched waveguide paths 3-3', 4-4'... intersecting a main waveguide path 2-2' formed on a waveguide path base board 1, conducting light coupling at intersecting points, thus forming branches waveguide paths, and having widths different sequentially from each other. By an optical filter function corresponding to wavelength regions lambda1, lambda2... according to the widths of these waveguide paths 3-3', 4-4'..., an incident light from a point 2 of the waveguide path 2-2' is separated spectrally to points 3', 4'... of the branched paths 3-3', 4-4'... and each of the separated light is detected by a corresponding light-receiving element. Thus, a waveguide-type spectroscope having simple and small-sized constitution is obtained.

8. 发明专利

JPS57157209A MODE FILTER FOR OPTICAL WAVEGUIDE 失效
公开(公告)号：JPS57157209A
公开(公告)日：1982-09-28
申请号：JP4222181
申请日：1981-03-23
申请人： FUJITSU LTD
发明人： KIYONO MINORU , NAKASHIMA HIROKI , SAWAKI ITSUPEI
IPC分类号： G02B6/126 , G02B6/134 , G02B6/28 , G02B6/34
摘要： PURPOSE:To obtain a mode filter which separates lights of the fundamental mode and lights of the higher mode from each other, by forming a crossing or a branch structure halfway on a main wave-guide. CONSTITUTION:A resist film 2 is applied onto a lithium niobate substrate 1 and is patterned, and Ti is diffused through parts 3' and 4', where the resist film is removed by patterning, to form a main waveguide 3 and a branch waveguide 4, and the crossing angle between them is set to 1-3 deg.. When a multimode light 8 is incident to the main waveguide 3, a higher mode light 10 is branched to the branch waveguide 4, and a fundamental mode light 9 goes straightly and is inputted to a function element 11. Thus, the branch waveguide 4 is operated as a crossing filter which separates rhe fundamental mode light and the higher mode light from each other.

9. 发明专利

JPS57155519A WAVEGUIDE TYPE OPTICAL SWITCH ELEMENT 失效
公开(公告)号：JPS57155519A
公开(公告)日：1982-09-25
申请号：JP4134281
申请日：1981-03-20
申请人： FUJITSU LTD
发明人： MIYAUCHI EIZOU , HORIMATSU TETSUO , NAKASHIMA HIROKI , KIYONO MINORU
IPC分类号： G02B6/12 , G02F1/03 , G02F1/05 , G02F1/313
摘要： PURPOSE:To achieve optical switching efficiently by applying a low voltage, by providing a refractive index distirbution type intervening layer in the center of the intersection part of optical waveguide. CONSTITUTION:On an electrooptical crystal substrate 1 made of LiNbO3, etc., optical waveguide 2 and 3 having a greater refractive index than the substrate 1 are arranged crossing each other at a relatively small angle, and in the center of their intersection part, an intervening layer 21 having the refractive index distribution that the refractive index increases gradually above that of the optical waveguides 2 and 3 from both the end parts A to the center part B. Further, a couple of electrodes 4 and 5 are provided on both the sides of the layer 21. Consequently, an optical signal incident to the optical waveguide 2 while its propagation track is curved gently by the inverting layer 21 controlled by applying a low voltage between electrodes 4 and 5, incidents at a small angle to the total reflection surface of the center part of the intervening layer 21, where the electric field intensity converges, so that the signal propagates to the optical waveguide 3.

10. 发明专利

JPS5797516A OPTICAL SWITCH 失效
公开(公告)号：JPS5797516A
公开(公告)日：1982-06-17
申请号：JP17307880
申请日：1980-12-10
申请人： FUJITSU LTD
发明人： HORIMATSU TETSUO , MIYAUCHI EIZOU , NAKASHIMA HIROKI , KIYONO MINORU
IPC分类号： G02B6/12 , G02F1/035 , G02F1/313
摘要： PURPOSE:To perform optical path switching securely with low power consumption by forming two crossing waveguides on a substrate of an optical crystal body, etc., by diffusing metal in belts and by providing electrodes for the waveguide switching outside of them. CONSTITUTION:On an about 1mm. thickness substrate 8 made of an optical crystal body or semiconductor, metal such as titanium is vapor-deposited in belts and then diffused by a heat treatment to form two crossing waveguides of parts 2 and 3, and 1 and 4. The intersection angle of the intersection part 5 of those two waveguides, and the width, thickness, etc., of each waveguide are set properly to guide light to a prescribed waveguide by bending the light. Switching electrodes 6 and 7 are provided outside of and in contact with the intersection part 5. The shape of the electrodes are determined adequately to switch light from the waveguide 1 to the waveguide 3 over to the waveguide 4 or light from the waveguide 2 to the waveguide 4 over to the waveguide 3. Thus, a mechanical drive part is eliminated to achieve secure optical path switching with low power consumption.

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