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公开(公告)号：JPH09197179A
公开(公告)日：1997-07-31
申请号：JP2576996
申请日：1996-01-19
Applicant: NEC CORP
Inventor： SHIMODA TAKESHI , NISHIMOTO YUTAKA
Abstract: PROBLEM TO BE SOLVED: To considerably increase the degree of freedom in the design of an optical device by curvedly forming a reflecting surface with a quartz material by reflowing. SOLUTION: An inclined surface 6 is formed by the anisotropic etching of an Si substrate 1, a quartz film 7 of several μm thickness is curvedly formed by reflowing on the inclined surface 6 of the substrate 1 so that the angle of inclination is made smaller than that of the surface 6 and the quartz film 7 is coated with Au, Al, etc., as a reflecting member 10 for reflecting light emergent from an optical waveguide 2 to obtain a reflecting mirror 12. The angle of inclination of the reflecting surface 13 of the mirror 12 depends on the reflowing of the quartz film 7, and when the angle of inclination is regulated to 45 deg., reflected light 8 can be obtd. in a direction perpendicular to the substrate. Since the reflecting surface 13 is curvedly formed, reflected light 8 is converged in accordance with the curvature.
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公开(公告)号：JPH09197178A
公开(公告)日：1997-07-31
申请号：JP2177296
申请日：1996-01-12
Applicant: NEC CORP
Inventor： MIZUTA SATOSHI , NISHIMOTO YUTAKA
Abstract: PROBLEM TO BE SOLVED: To surely form grooves in a substrate on which an optical waveguide is formed, regardless of the methods of optical waveguide forming process and to execute packaging of optical fibers and packaging of positioning guide pins, etc., of the grooved substrate by using these grooves. SOLUTION: A first layer 3 consisting of a material having the durability to dry etching is patterned and formed into the form of the mask 8 for the groove forming etching of a substrate 1. A second layer 2 consisting of a material having the durability to the groove forming etchant of the substrate 1 is patterned and formed into the form of the mask by the etching using the first layer 3 as the mask. This layer is used as the mask for groove forming etching to form the grooves 9 on the substrate 1.
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公开(公告)号：JPH08166565A
公开(公告)日：1996-06-25
申请号：JP31169594
申请日：1994-12-15
Applicant: NEC CORP
Inventor： NISHIMOTO YUTAKA
Abstract: PURPOSE: To obtain an optical control device constituted so that DC drift is suppressed, a low driving voltage is obtained, a high-speed action is executed and temperature drift is suppressed besides. CONSTITUTION: An optical circuit 5 consisting of two optical waveguides 2a and 2b and buffer layers 3a and 3b are formed on the surface of a substrate 1. Then, electrodes 4a, 4b and 4c are formed between the waveguides 2a and 2b and on the outside thereof at positions where the waveguides 2a and 2b are interposed. The buffer layer 3a is formed under the electrode 4a formed between two waveguides 2a and 2b and the buffer layer 3b is formed under the electrode 4b formed on the outside of two waveguides 2a and 2b except one part thereof.
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公开(公告)号：JPH07110410A
公开(公告)日：1995-04-25
申请号：JP25621493
申请日：1993-10-14
Applicant: NEC CORP
Inventor： KITAMURA NAOKI , NISHIMOTO YUTAKA
Abstract: PURPOSE:To simplify production processes and to enable mass production by executing the optical path conversion in an optical waveguide by the reflection of a reflection film which is butted against the waveguide end face of the optical waveguide and is disposed at the front end face of a reflector by the direction of guides. CONSTITUTION:The reflector 5 is produced by matching the sizes of the guides 4a and 4b and the reflection film 6 which reflects the light is previously formed on the front end face 5a thereof. The reflector 5 is directed toward the waveguide end face 3a along the guides 4a and 4b and the reflection film 6 of the reflector 5 is butted against the core layer 3 of the waveguide end face 3a. Then, the incident light from the core layer 3 to the waveguide end face 3a is subjected to the optical path conversion by reflection of the reflection film 6 and is again emitted as the light after the optical path conversion from the waveguide end face 3a again to the core layer 3. The metallic film of the reflection film 6 formed on the reflector 5 is integrally formed by a sputtering method, etc., and is, therefore, suitable for mass production.
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公开(公告)号：JPH0727947A
公开(公告)日：1995-01-31
申请号：JP17425593
申请日：1993-07-14
Applicant: NEC CORP
Inventor： NISHIMOTO YUTAKA
Abstract: PURPOSE:To obtain such an optical circuit that realizes high efficiency of optical coupling between an optical waveguide and various optical parts, low cost of the optical circuit, and high reliability against temp. change and vibrational impact. CONSTITUTION:This circuit consists of a Si substrate 1, optical waveguide 2 comprising quartz, semiconductor light source 4 optically coupled with the waveguide 2. In this circuit, a spherical lens 8 is formed on the Si substrate between the optical waveguide 2 and the semiconductor light source 4 by using the same material as the optical waveguide 2. The lens 8 is a solid-state component having a function to change the spot size.
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Patent Agency Ranking
公开(公告)号：JPH06347656A
公开(公告)日：1994-12-22
申请号：JP13635093
申请日：1993-06-08
Applicant: NEC CORP
Inventor： NISHIMOTO YUTAKA
Abstract: PURPOSE:To manufacture an optical circuit with a high yield and to make it short in size by cutting off one side optical waveguide between two pieces of optical waveguides forming the directional coupler for a guided light of a long wavelength. CONSTITUTION:A directional coupler optical waveguide 4a being one of directional coupler optical waveguides 4a, 4b is connected to introduced light waveguides 2a where two wavelengths are inputted/outputted. Another directional coupler optical waveguide 4b arranged adjacently to the directional coupler optical waveguide 4a is cut off for the waveguided light of the long wavelength. Then, the guided light of the long wavelength passes through the directional coupler without coupling with the other optical waveguide. On the other hand, the directional coupler is set so as to become a perfect connection length for the guided light of a short wavelength. Then, the guided light of the short wavelength is coupled with the other optical waveguide in the directional coupler, and power is perfect shifted. Thus, two wavelengths are multiplexed/ demultiplexed.
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公开(公告)号：JPH0591049A
公开(公告)日：1993-04-09
申请号：JP27331591
申请日：1991-09-25
Applicant: NEC CORP
Inventor： NISHIMOTO YUTAKA
IPC: H04B10/2507 , G02B6/122
Abstract: PURPOSE:To drastically improve the S/N in an output of a semiconductor photodetector receiving a signal when the optical circuit is provided to a 2-way optical communication transmitter-receiver. CONSTITUTION:A waveguide type wavelength filter 8 is installed to an optical guide path 2c connecting optically to a semiconductor detector 5. Thus, a reflection return optical wave outputted from the semiconductor light source 4 in a specific oscillation wavelength is interrupted and the quantity of the return light reaching the semiconductor photodetector 5 is much reduced in comparison with a conventional structure and the S/N of the output of the semiconductor detector 5 is drastically improved.
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公开(公告)号：JPH0434419A
公开(公告)日：1992-02-05
申请号：JP13960790
申请日：1990-05-31
Applicant: NEC CORP
Inventor： NISHIMOTO YUTAKA
Abstract: PURPOSE:To obtain the optical control device which operates with a low switching voltage and performs stable switching operation by forming transparent electrodes and a transparent conductive film and then making a buffer layer thin. CONSTITUTION:This device has a crystal substrate 12 which is provided with a directional coupler 1, the buffer layer 13 which is made thin, the transparent electrode, and the transparent conductive film 15. On the crystal substrate 12, the thin buffer layer 13 is mounted. The two transparent electrodes 14 are formed on two optical waveguides 16 across the thin film buffer layer 13 respectively. Then the transparent conductive film 15 is formed on the transparent electrodes 14 and thin film buffer layer 13. Consequently, the buffer layer can be made thin and the low voltage operation and stable operation of the light control device is made possible without increasing the loss of the light control device.
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公开(公告)号：JPH01223432A
公开(公告)日：1989-09-06
申请号：JP5106688
申请日：1988-03-03
Applicant: NEC CORP
Inventor： NISHIMOTO YUTAKA
Abstract: PURPOSE:To prevent the generation of an operation failure caused by an influence of an external environment and magnitude of an applied voltage, etc. by forming an area between two pieces of optical waveguides to a projecting state from the surface of its optical waveguides. CONSTITUTION:On a substrate 1 consisting of LiNbO3, etc., optical directional couplers 4 consisting of two pieces of optical waveguides being adjacent to each other and control electrodes 2 are formed. Subsequently, a groove is formed on the substrate 1 and the electrode 2 is formed in its groove, and other parts than the electrode formed area can also be formed to an LiNbO3 projecting part 3. Also, only the area between the electrodes 2 can be formed to the projecting part 3, as well. In this regard, the projecting part 3 and the electrode 2 can be formed out only by allowing them to come into contact with each other but also without allowing them to come into contact with each other. Moreover, it is also possible to laminate a layer on the substrate and to provide the optical waveguide on its layer.
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公开(公告)号：JPS6311868A
公开(公告)日：1988-01-19
申请号：JP15554586
申请日：1986-07-01
Applicant: NEC CORP
Inventor： NISHIMOTO YUTAKA
IPC: G01R23/17
Abstract: PURPOSE:To enhance frequency reading accuracy and to widen a measuring frequency band, by using a light deflector receiving only the application of a known frequency electric signal and diffracting the light from a light source in an acoustooptical spectrum analyser. CONSTITUTION:Light detectors 46a, 64b are sued in an acoustooptical spectrum analyser t enhance the measuring accuracy of the frequency of an electric signal fB to be measured. That is, known frequency signal fA, fC are preliminarily applied to a converter 33b and the positional shift of the spectra of the signals fA, fC on array 46b is always observed to control the frequency of a local oscillator 37 to enhance measuring accuracy. When a light diffracting direction due to respective elastic surface waves 34a, 34b generated from converters 33a, 33b is reversed around the propagation direction of 0-order diffracted light, diffracted light 44 due to the signal fB is not affected by the surface wave 34b due to the signals fA, fC at all. By this method, the increase in the erroneous detection of frequency and the deterioration of an intensity measured value caused by the cross modulation of a sonic wave due to the signals fA, fC and causing the increase in the intensity of the diffracted light of a high order mode can be prevented.
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