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21. 发明专利

JPS57190922A POLARIZATION ELIMINATING CIRCUIT 失效
公开(公告)号：JPS57190922A
公开(公告)日：1982-11-24
申请号：JP7490981
申请日：1981-05-20
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SARUWATARI MASATOSHI , FUJII YOUJI , MINOWA JIYUNICHIROU
IPC分类号： G02B27/28
摘要： PURPOSE:To obtain a polarization eliminating circuit that eliminates the polarization of incident light, by making the linear polarized light incident vertically to a uniaxial crystal which is set so that the axis (z) is included in the surface vertical to the optical acis and then separating the normal beam from the abnormal beam with the equal optical power. CONSTITUTION:A beam is made incident so that the vibrating direction of linear polarized light is set to X-X', i.e., in the direction where a 45 deg. inclination is caused to the axes (y) and (z) of a uniaxial crystal block. In this case, the optical electric power is equal between the normal beams shown by solid lines and the abnormal beams shown by dotted lines, and both the normal and abnormal beams are transmitted in the same direction and at different speeds. When the difference of the optical path between both beams is larger than the interferable length, thes beams behave independently of each other. Thus the synthesization of electric fileds is not obtained, and the electric power synthesization is possible. The non-polarized light is equivalently obtained although both beams produce the orthogonal component and are turned into the oval polarized light while they are propagating in a sigle mode fiber or the polarized face is turned. The reason is the both beams receive the same degree of the effect of the above-mentioned phenomena.

22. 发明专利

JPS57161721A POLARIZATION ELIMINATING CIRCUIT 失效
公开(公告)号：JPS57161721A
公开(公告)日：1982-10-05
申请号：JP4542981
申请日：1981-03-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SARUWATARI MASATOSHI , FUJII YOUJI , MINOWA JIYUNICHIROU
IPC分类号： G02B27/28
摘要： PURPOSE:To obtain equivalent polarization-free emitted light by separating a linearly polarized parallel light beam by a polarizing splitter into linearly polarized light beams, whose planes of polarization are at right angles to each other, with equal photoelectric power, and mixing the linear polarized light beam and the 2nd linearly polarized light beam through the 2nd polarizing splitter. CONSTITUTION:The figure shows savart plates as polarized-wave separating elements and a glass rod as a delay circuit. A light source 8, a lens 9, savart plates 10 and 11, a glass rod 12, a lens 13, and a single mode fiber 14 are provided. The savart plates 10 and 11 are so set that their planes of intrinsic polarization are coincident with each other. When linearly polarized light having a plane of polarization slanting at 45 deg. to the plane of intrinsic polarization of the savert plate 10 is incident to the plate 10, two linearly polarized light beams crossing at right angles are emitted with equal photoelectric power while shifting in position. For this purpose, the glass bar 12 placed on the optical path of one linearly polarized light beam gives the other light beam a difference in optical path length which exceeds coherence length, and the savart plate 11 synthesizes those two linearly polarized light beams to obtain equivalent polarization-free light.

23. 发明专利

JPS55155306A BANDDPASS PASSING TYPE OPTICAL FILTER 失效
公开(公告)号：JPS55155306A
公开(公告)日：1980-12-03
申请号：JP6361979
申请日：1979-05-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NOSU KIYOSHI , MINOWA JIYUNICHIROU
IPC分类号： G02B5/28
摘要： PURPOSE:To provide the characteristic of a narrow band and steep tail by subsequently laminating and integrating a plurality of the band-pass passing type filters having coherent multilayer films by means of adhesive agent layers. CONSTITUTION:A laminate 7 has band-pass passing type optical filters 4a, 4b, 4c. These are subsequently laminated by way of adhesive agent layers 6 in the direction where the light-transmittable plate 1 of the band-pass passing type optical filter 4b is disposed on the coherent multilayer films 3 of the band-pass passing type optical filter 4a and the light-transmittable plate 1 of the band-pass passing type optical filter 4c on the coherent multilayer films 3 of the band-pass passing type optical filter 4b. Further, the light-transmittable substrate 5 is laminated by way of adhesive agent layer 6 on the coherent multilayer films 3 of the band-pass passing type optical filter 4c. Since the coherent multilayer films 3 of the band-pass passing type optical filters 4a, 4b and 4c exist in this way, the band-pass passing type filter characteristics may be made of a narrow band and the steep tail.

24. 发明专利

JPS5595907A PHOTO BRANCHING FILTER 失效
公开(公告)号：JPS5595907A
公开(公告)日：1980-07-21
申请号：JP356779
申请日：1979-01-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AOYAMA KOUICHI , MINOWA JIYUNICHIROU , KOBAYASHI IKUTAROU , MIKI TETSUYA
IPC分类号： G02B6/293 , G02B6/34
摘要： PURPOSE:To miniaturize the optical system by providing the function of combining and dispersing the light signal comprising multiplexing the plural light signals of different wavelengths to an optical means as well as to reduce the losses of the light signal by densely arraying the end parts of plural optical fibers in series within the common plane. CONSTITUTION:The filter is provided with an optical fiber F0 which transmits the light signal L0 comprising multiplexing plural N-light signals L1-LN of different wavelengths, N-optical fibers F1-FN which separately transmit the light signal, a light dispersing element D which angularly disperses the light signals L1...LN at angles when the light signal L0 enters and the common optical means which enters the light signal L0 emitted from the end face f0 of the optical fiber F0 to the light dispersing element D, lets the light signals L1...LN emit from the light dispersing element D and enters these respectively into the optical fibers F1...FN. The end parts of the optical fibers F0, F1...FN are densely arrayed in series within the common plane. Hence, the optical system may be miniaturized and the losses of the light signal are reduced through decreasing the angle theta' of the light signal L0 and L1...LN.

25. 发明专利

JPS5565905A OPTICAL BRANCHING OR COMBINING DEVICE 失效
公开(公告)号：JPS5565905A
公开(公告)日：1980-05-17
申请号：JP13959778
申请日：1978-11-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AOYAMA KOUICHI , MINOWA JIYUNICHIROU
IPC分类号： G02B6/293 , G02B6/34
摘要： PURPOSE:To eliminate losses with fluctuations in wavelength and achieve the stabilization of branching function and combining function by differing the diameters of the respective core of a single-color light transmission optical fiber and multiplexed light transmission optical fibers. CONSTITUTION:The diameter of the cores of single-color light transmission optical fibers Ei is set larger than the diameter of the core of a multiplexed light transmission optical fiber A and the relative opsitions of the fiber A, optical lens systems D, B, branching element C and fibers Ei are so selected that, when the wavelength lambda1 of the single-color light Li in the wavelength multiplexed light (L1+L2+...) has a value lambdai0, the center of the light spot mi obtainable on the end face ei of the core of the fibers Ei aligns to the center of the end face ei. Hence, even if the wavelength lambdai slightly deviates from the value lambdai0, it is possible to let the spot mi exist on the end face ei. On the other hand, by setting the diameter of the cores of the fibers Ei smaller than the diameter of the core of the fiber A, the stability of the combining function may be improved.

26. 发明专利

JPS5515133A PRODUCTION OF PLANE DIFFRACTION GRATING 失效
公开(公告)号：JPS5515133A
公开(公告)日：1980-02-02
申请号：JP8734478
申请日：1978-07-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJII YOUJI , MINOWA JIYUNICHIROU
IPC分类号： G02B5/18
摘要： PURPOSE:To facilitate production of the plane diffraction grating of high accuracy by selectively etching a silicon single crystal through making use of the anisotropy of its etching speed with respect to crystal planes. CONSTITUTION:Regions other than the region 1' of a width a are masked 4 on the main plane 1 of a silicon single crystal 3 whose main plane 1 is (100) plane and side plane 2 is (110) plane. Next, it is etched by using such an etching solution as an aqueous solution of amine pyrocatechol. The (100) plane and (110) plane are etched faster than the (111) plane, whereby a groove streak 5 of an inverse isosceles triangle shape wherein the inner side faces 5L, 5R are the (111) plane and the width a is the length of the base is formed.

27. 发明专利

JPS5479059A LIGHT CHOPPER 失效
公开(公告)号：JPS5479059A
公开(公告)日：1979-06-23
申请号：JP14594477
申请日：1977-12-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI IKUTAROU , MIKI TETSUYA , MINOWA JIYUNICHIROU , SHIMOISHI MASASHI
IPC分类号： G01J1/04 , G01J1/02 , G02B26/04 , G02F1/01
摘要： PURPOSE:To achieve the improvement in chopper performance by cutting off between an optical fiber and a photo detector by a shield plate which vibrates stably. CONSTITUTION:Mechanical vibrating reeds 5, 5 which constitute a tuning fork vibrator provided with electro-mechanical converting elements 6 vibrate at stable frequencies by the electric signal being applied to the elements 6. The reception of the fine beam light emitted by an optical fiber 1 by a photoelectric transducer 3 is periodically and stably cut off by the edge portion of the shield plate 4 provided to the vibrating reed 5. Hence, light chopping of high performance is accomplished. If the vibrating frequencies of the vibrating reeds 5, 5 are controlled by detecting even order higher harmonics, etc. of the light receiving signal by the light having been chopped, the relative positions of the optical fiber and the vibrating reed may be readily adjusted so as to minimize the even order higher harmonic components.

28. 发明专利

JPS5434850A PHOTO SWITCH 失效
公开(公告)号：JPS5434850A
公开(公告)日：1979-03-14
申请号：JP10096577
申请日：1977-08-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AOYAMA KOUICHI , MINOWA JIYUNICHIROU
IPC分类号： G02B6/122 , G02B26/08 , G02F1/31
摘要： PURPOSE:To perform long-term stable and highly reliable switching by moving optical medium provided with plural optical wave guides thereby switching the propagation of light to optical fibers.

29. 发明专利

JPS549647A LOSS MEASURING METHOD OF OPTICAL FIBERS 失效
公开(公告)号：JPS549647A
公开(公告)日：1979-01-24
申请号：JP7474977
申请日：1977-06-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MINOWA JIYUNICHIROU , KOYAMA MASAKI
IPC分类号： G01M11/02 , G01M11/00 , G02B6/00
摘要： PURPOSE:To measure loss continuously in a length direction by providing two bend parts in a long-length state, entering light from the first bend part and drawing it out from the second bend part.

30. 发明专利

JPS5842002A MULTILAYERED DIELECTRIC FILTER DEVICE 失效
公开(公告)号：JPS5842002A
公开(公告)日：1983-03-11
申请号：JP14017681
申请日：1981-09-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MINOWA JIYUNICHIROU , FUJII YOUJI
IPC分类号： G02B5/28 , H01P1/213
摘要： PURPOSE:To prevent the influence of the reflected light between dielectric film surfaces and to obtain the good band stop characteristics, by arranging plural multilayered dielectric films so that they are inclined to planes orthogonal to the optical axis and adjacent films have specular symmetry. CONSTITUTION:In the filter device where multilayered dielectric films A1-An formed on light-transmissive supporting material Bij(i=1-n-1 and j=2-n) are fixed with an adhesive 6 by adhesion, these films are so arranged that their surfaces P1-Pn are inclined at an angle +theta and an angle -theta alternately to planes orthogonal to an optical axis O and adjacent surfaces have specular symmetry. Since the influence of the reflected light between adjacent dielectric film surfaces is prevented, the good band stop characteristics is obtained.

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