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1. 发明专利

JP2003240984A MASK FOR PHASE ADJUSTMENT OF ARRAY WAVEGUIDE GRATING AND MANUFACTURING METHOD FOR ARRAY WAVEGUIDE GRATING USING THE SAME 审中-公开
公开(公告)号：JP2003240984A
公开(公告)日：2003-08-27
申请号：JP2002037670
申请日：2002-02-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , ABE ATSUSHI
IPC分类号： G02B6/12 , G02B6/13
摘要： PROBLEM TO BE SOLVED: To adjust the phase of an array waveguide even when there is no space to arrange a mask for phase adjustment at an array waveguide part. SOLUTION: In the case that a phase error is present at the array waveguide 4, through the mask 9 for the phase adjustment provided with windows 10, 11 and 12 in a length corresponding to the phase error, ultraviolet ray beams are emitted and a refractive index is changed. Since the mask 9 for the phase adjustment is arranged not at the part of the array waveguide 4 but at the part of a slab waveguide 3, the space is not required at the array waveguide part. Also, since a plurality of the windows 10, 11 and 12 are provided, only the part of uniform power beams of the ultraviolet ray beams is emitted through the windows 10, 11 and 12 and the phase error is adjusted with excellent reliability. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2002250675A LOW-COHERENCE REFLECTOMETER 失效
公开(公告)号：JP2002250675A
公开(公告)日：2002-09-06
申请号：JP2001050421
申请日：2001-02-26
申请人： ANDO ELECTRIC , NIPPON TELEGRAPH & TELEPHONE
发明人： AKIKUNI FUMIO , AOKI SHOICHI , YANO TETSUO , MORI TORU , TAKADA KAZUMASA
IPC分类号： G01N21/49 , G01M11/00 , G01M11/02 , G01N21/17
摘要： PROBLEM TO BE SOLVED: To provide a low-coherence reflectometer, facilitating the length adjustment of an optical path by shortening the length of the optical path, realizing cost reduction through simplifying of a device, and capable of accurately measuring the distribution of reflectivity and the power of reflected light. SOLUTION: This reflectometer is equipped with an optical coupler 3 for branching light from a low-coherence light source 1 as a measured light DL and a local oscillation light KL; an optical coupler 5 for inputting the measured light DL into a measured light circuit 7, while branching reflected light RL obtained by inputting the measured light into the light circuit 7; a polarization controller 9 for conrolling the polarized state of the reflected light RL branched by the optical coupler f5; an optical coupler 13 for causing the oscillation light KL to come into a reflector 16, while branching the oscillation light KL reflected by the reflector 16; and an optical coupler 11 for combining the reflected light RL, whose polarized state is controlled by the polarization controller 9 with the oscillation light KL branched by the optical coupler 13.

3. 发明专利

JPH02140638A BACKSCATTERING LIGHT MEASURING INSTRUMENT 失效
公开(公告)号：JPH02140638A
公开(公告)日：1990-05-30
申请号：JP29413488
申请日：1988-11-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , NODA JUICHI , KOBAYASHI MASARU , UCHIDA NAOYA
IPC分类号： G01N21/49 , G01M11/00
摘要： PURPOSE:To attain measurement of the backscattering light generated in an optical waveguide to be measured in a signal-to-noise ratio by providing a fiber type photocoupler, a total reflection mirror and the optical waveguide. CONSTITUTION:An emitted light from a light source 1 is divided into two by a fiber type photocoupler 2, and one of them is utilized as a reference light. This reference light becomes parallel beams by an objective lens 17, reflected by a total reflection mirror 3 and made incident on the coupler 2 through the lens 17 again. Subsequently, the reflection mirror 3 moves in the beam direction, and by giving successively a delay time, the optical frequency of the reference light is deviated a little. The other light which is divided into two passes through a fiber type phase modulator 4 and made incident on the optical waveguide 5. Also, a backscattering light generated in the optical waveguide 5 passes through the modulator 4 again and made incident on the coupler 2, and multiplexed with the reference light. This multiplexed light becomes parallel beams by an objective lens 7 and made incident on a photodetector 28. The output of the detector 28 passes through a mixer circuit 36 and stored in a waveform memory 29.

4. 发明专利

JPH01141305A MEASURING INSTRUMENT FOR DEPTH OF MINUTE GROOVE 失效
公开(公告)号：JPH01141305A
公开(公告)日：1989-06-02
申请号：JP29774987
申请日：1987-11-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , NODA JUICHI
IPC分类号： G01N21/88 , G01B11/22 , G01N21/93 , G01N21/956 , H01L21/66
摘要： PURPOSE:To improve the portability, and also, to raise the measurement accuracy by connecting a spectral part and a sample part by using a multi-mode optical fiber so that the sample part can be detached physically from other part, in an optical type measuring instrument. CONSTITUTION:White color light which has been generated by a white color light generating part 16 is made incident on a spectral part 19, and a light beam whose spectral width is narrow is extracted, while sweeping its wavelength. This light beam from the spectral part 19 is made incident on a sample part 23 through a connecting part 20 whose main element is a multi-mode optical fiber 22. In this sample part 23, the light beam is radiated to a sample 12 in which a minute groove has been formed. Subsequently, its reflected light is detected by photodetectors 13, 27 and by inputting its detecting signal to a signal processing 28, the depth of the minute groove of the sample 12 is measured. In such a way, the spectral part 19 and the sample part 23 can be detached physically, although they are coupled, therefore, a transfer of vibration, etc., can be prevented.

5. 发明专利

JPS63196829A METHOD AND APPARATUS FOR SEARCHING FAULT POINT OF LIGHT WAVEGUIDE 失效
公开(公告)号：JPS63196829A
公开(公告)日：1988-08-15
申请号：JP2734687
申请日：1987-02-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , SENDA KAZUNORI , NODA JUICHI , YOKOHAMA ITARU
IPC分类号： G01M11/00 , G02B6/00
摘要： PURPOSE:To achieve a higher searching accuracy, by making backward scattered beams from a fault point interfere with a reference beam as part of an emission light using a light source having a large spectrum range as given a delay time or an optical path difference to measure interference components with respect to respective delay times. CONSTITUTION:For example, light of a super luminescent diode 16 which emits light with the spectrum width of 200Angstrom is divided in two with a beam splitter 18; one beam is reflected with a total reflection mirror 19, while the other beam is propagated through a light waveguide 22. Then, beam backward scattered in the light waveguide 22 is reflected with the splitter 18 to be combined with a totally reflected light from the reflection mirror 19 and stored into a computer 26 through a current amplifier 24 and a selection level meter 25. Then, for example, the reflection mirror 19 is moved on a stage 20 at a fixed speed to measure amplitude of an interference fringe generated in the combination of waves, thereby detecting a power of the backward scattered light generated at a point within the light waveguide 22 as well as determining the position of the fault point.

6. 发明专利

JPS638706A POLARIZATION MAINTAINING OPTICAL FIBER 失效
公开(公告)号：JPS638706A
公开(公告)日：1988-01-14
申请号：JP15329886
申请日：1986-06-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SENDA KAZUNORI , NODA JUICHI , TAKADA KAZUMASA , YOKOHAMA ITARU
IPC分类号： G02B6/024 , C03C13/04 , G02B6/10
摘要： PURPOSE:To obtain a small crosstalk characteristic regardless of 1-2m short size by giving a double structure to a clad part and using materials, by which light is less absorbed, in the inside clad part and using materials, by which light is much absorbed, in the outside clad part. CONSTITUTION:The clad surrounding a core is formed with the double structure, and the inside clad consists of materials by which light is less absorbed, and the outside clad consists of materials by which light is much absorbed. For example, the clad of a polarization maintaining optical fiber has the double structure and consists of an inside clad 5 and an outside clad 6. A core 1 consists of an SiO2-GeO2 glass, and a stress applying part 2 consists of an SiO2- B2O3 glass. The inside clad 5 has 110mum outside diameter and consists of a quartz glass of 100% SiO2, and the outside clad 6 has 150mum outside diameter and consists of a quartz glass where 30ppm V (vanadium), and a primary coating layer 4 consists of a modified silicon resin. Addition of 1ppb V to the outside clad causes 2.5dB/km absorption loss, and addition of 30ppm V causes 75dB/m absorption loss.

7. 发明专利

JPS6219815A FIBER TYPE OPTICAL FREQUENCY DEMULTIPLEXER AND MULTIPLEXER 失效
公开(公告)号：JPS6219815A
公开(公告)日：1987-01-28
申请号：JP15954885
申请日：1985-07-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OKAMOTO KATSUNARI , YOKOHAMA ITARU , NODA JUICHI , TAKADA KAZUMASA
IPC分类号： G02B6/02 , G02B6/28 , G02B6/287 , G02B6/34
摘要： PURPOSE:To operate a fiber type optical frequency demultiplexer and multiplexer even stably against external temperature variation by connecting the 1st and the 2nd cores of the 1st dual-core fiber to corresponding cores of the 2nd and the 3rd dual-core fibers in a welded and drawn part. CONSTITUTION:One end of a dual-core fiber 5 is connected to one-terminal sides of dual-core fibers 6 and 7 by a connection part 18 and the other-terminal sides of the fibers 6 and 7 are connected to terminals of dual-core fibers 8 and 9, and 10 and 11 by connection parts 19 and 20. Photocoupling parts 12 and 13 are formed at both end parts of the fibers 5 by drawing the fiber and photocoupling parts 14 and 15, and 16 and 17 are formed at intermediate parts of the fibers 6 and 7 and the opposite end parts of the fiber 5. The coupling end part between the fibers 6 and 7, and fiber 5 is formed as the welded and drawn part 21 and one-terminal sides of the fibers 8 and 9 or 10 and 11 are formed as welded and drawn parts 22 and 23. Thus, light beams of four frequencies are demultiplexed or multiplexed stably even against external temperature variation.

8. 发明专利

JPS6217709A OPTICAL COUPLER 失效
公开(公告)号：JPS6217709A
公开(公告)日：1987-01-26
申请号：JP15605985
申请日：1985-07-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOKOHAMA ITARU , NODA JUICHI , OKAMOTO KATSUNARI , TAKADA KAZUMASA
IPC分类号： G02B6/02 , G02B6/28 , G02B6/287
摘要： PURPOSE:To easily execute an input and an output of light to the respective cores by placing in parallel the first core of a dual core fiber having two cores, and an optical fiber having a single core, welding and drawing both of them extending over a prescribed length and making them adjacent to an interval in which light beams for propagating the core of the optical fiber and the first core of the dual fiber are coupled to each other. CONSTITUTION:The titled optical coupler is provided with a dual core fiber 41, an optical fiber 42 having a single core, the first core 43, the second core 44, a core 45, and a welding and drawing part 46. The optical fiber 42 is made adjacent to the second core 44 of the dual core fiber 41, a part of which is welded and drawn, optical coupling is generated between the core 45 and the second core 44, and drawing is adjusted so that an optical power which has been made incident on the core 45 is migrated by 100% to the second core 44. In a sectional drawing shown in the figure, (a) and (b) denote a state before welding and a state after welding, respectively, and as for the second core 44 and the core 45, a value of a normalized frequency (v) is decreased by drawing, an electric field is expanded and optical coupling is generated.

9. 发明专利

JPS61259225A POLARIZATION PLANE ROTATING DEVICE 失效
公开(公告)号：JPS61259225A
公开(公告)日：1986-11-17
申请号：JP10235785
申请日：1985-05-14
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , OKAMOTO KATSUNARI , YOKOHAMA ITARU , NODA JUICHI
IPC分类号： G02B6/00 , G02B27/28 , G02F1/01
摘要： PURPOSE:To rotate the plane of polarization easily with simple constitution by twisting a loop-shaped optical fiber into the figure of 8 and fixing one end and fixing the other end to an expanding and contracting device. CONSTITUTION:A single mode fiber is coiled into a loop 6, and this loop 6 is twisted into the numeral of 8, and one end A is fixed to a holder 8 and the other end B is fixed to an oscillating surface of a speaker 7. A voltage is applied to the speaker 7 to oscillate vertically the oscillating surface, and the voltage is adjusted to select only a polarized wave in the fiber. This, the variance of the refractive index is increased by expansion and contraction of the twisted loop, and the plane of polarization is rotated easily with simple constitution using only the speaker, and the efficiency of coupling to another fiber is improved.

10. 发明专利

JPS60103317A FIBER TYPE POLARIZER AND ITS MANUFACTURE 失效
公开(公告)号：JPS60103317A
公开(公告)日：1985-06-07
申请号：JP21091583
申请日：1983-11-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KAWACHI MASAO , KOBAYASHI MORIO , TAKADA KAZUMASA
IPC分类号： G02B5/30 , G02B6/00 , G02B6/024 , G02B6/10
摘要： PURPOSE:To realize a fiber type polarizer by an easy method by drawing a desired part of a single-mode optical fiber into a biconical taper shape together with dummy fibers, and sticking a metallic film on the drawn part. CONSTITUTION:Dummy fibers 21 and 22 having no core are arranged is parallel at both sides of the single-mode optical fiber 1 to contact therewith and fixed temporarily on drawing tables 23 (23a and 23b). Then a part of the contact area is heated to fuse the fiber array, and one drawing table 23, e.g. 23b is moved in parallel in a Z direction to form a fused and drawn part 24 in the biconical taper shape. Then the fiber array is moved to a support plate 25 and fixed with an adhesive 26, and a metallic film 27 is vapor-deposited on the fused and drawn part 24 in a +y and a -y direction. Thus, the fiber type polarizer which has a high extinction ratio and small excessive loss is realized.

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