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51. 发明专利

JPH05157920A WAVEGUIDE DIFFRACTION GRATING 失效
公开(公告)号：JPH05157920A
公开(公告)日：1993-06-25
申请号：JP31927791
申请日：1991-12-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI HIROSHI , KAWACHI MASAO , NISHI NORIO
IPC分类号： G02B5/18 , G02B6/12 , G02B6/28 , G02B6/34
摘要： PURPOSE:To eliminate the polarization dependency of an array waveguide diffraction grating by loading a film (stress imparting film) which has residual stress and varies the birefringence value of a waveguide on the waveguide. CONSTITUTION:On a silicon substrate 3, an input waveguide 4, an output waveguide 6, input- and output-side slab waveguides 51 and 52, the array waveguide diffraction grating 2, and stress inducing film 11 are arranged. On the array waveguide diffraction grating 2 consisting of channel waveguides 21-2i which have the birefringence value B and optical wavelengths Li (i=1, 2, 3...), the stress imparting film 11 which varies the birefringence value of the channel waveguide to B' is loaded. Namely, when the length for which the stress imparting film 11 converts the channel waveguide is Li (i=1, 2, 3...), an equation is satisfied. Namely, the difference in birefringence value generated between the part where the stress imparting film 11 is loaded and other parts is utilized to eliminate the polarization dependency totally.

52. 发明专利

JPH04220602A WAVEGUIDE TYPE OPTICAL WAVE SYNTHESIZING AND BRANCHING FILTER 失效
公开(公告)号：JPH04220602A
公开(公告)日：1992-08-11
申请号：JP40528090
申请日：1990-12-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI HIROSHI , NISHI NORIO , KAWACHI MASAO
IPC分类号： G02B6/12 , G02B6/34
摘要： PURPOSE:To provide a waveguide type optical wave synthesizing and branching filter having high diffraction efficiency and narrow intervals of multiple wavelengths (i.e., a large number of wavelengths are stacked). CONSTITUTION:A waveguide type optical wave synthesizing and branching filter comprises a substrate 1, and an input waveguide line 2, an input side slab waveguide line 3, an array waveguide line 4, an output side slab waveguide line 6 and a plurality of output waveguide lines 7, all of which are disposed on the substrate 1 and sequentially connected together, and at a portion where the output side slab waveguide line 6 is connected to the array waveguide line 4 the space between channeled waveguide lines 5 for constituting the array waveguide line 4 is narrowed to such an extent that the channeled waveguide lines 5 can be coupled together.

53. 发明专利

JPH04213407A BRANCHING/MULTIPLEXING OPTICAL WAVEGUIDE CIRCUIT 失效
公开(公告)号：JPH04213407A
公开(公告)日：1992-08-04
申请号：JP40714590
申请日：1990-12-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KITO TSUTOMU , KAWACHI MASAO , SUZUKI SENTA , TAKAHASHI HIROSHI
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To obtain the branching/multiplexing optical waveguide which is low in loss and small in fluctuation in branching ratio by providing axial misalignments at the connecting point between the inflection point of the branching optical waveguides and an output waveguide and providing a spacing between the branching waveguides. CONSTITUTION:The peak of the field distribution of the curved waveguides moves to an outer side as the radius of curvature decreases. Then, the axial misalignments d2, d1 are provided at the connecting point b between the inflection point a of the branching waveguides 5, 6 and the output waveguide C of the branching waveguides 5, 6 to match the peaks of the field distribution, by which the increase of the loss and the fluctuation in the branching ratio by the field distribution mismatching are suppressed. The loss is smaller than in the case of a zero spacing and, therefore, the loss is minimized if the spacing d1 is provided between the branching waveguides 5 and 6 at a branching point 7. For example, the spacing of about 1mum is provided. The waveguide/ demultiplexing optical waveguide is lowered in the loss by these means and the fluctuation in the branching ratio is decreased.

54. 发明专利

JPH02244105A WAVEGUIDE TYPE DIFFRACTION GRATING 失效
公开(公告)号：JPH02244105A
公开(公告)日：1990-09-28
申请号：JP6558889
申请日：1989-03-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI HIROSHI , NISHI NORIO , KATO KUNIHARU
IPC分类号： G02B6/12
摘要： PURPOSE:To attain a higher resolving power without being limited in shape by varying the phases of light between respective three-dimensional waveguides by the plural three-dimensional waveguides which vary in length. CONSTITUTION:The three-dimensional waveguide 9 for input, the 1st two-dimensional waveguide 2, a waveguide lens 7 for collimation, the three-dimensional waveguide 4, the 2nd two-dimensional waveguide 3, a waveguide lens 8 for condensing and the three-dimensional waveguide 10 for output are disposed on a waveguide substrate 1. The respective three-dimensional waveguides 4 consist of 4 pieces of the three-dimensional waveguides 5 having a 90 deg. arc shape and 5 pieces of the three-dimensional waveguides 6 having a straight line shape and are so designed that the travel lengths thereof vary by a prescribed length form the travel lengths of the adjacent waveguides. The radii of curvature of all the arc-shaped three-dimensional waveguides 5 are equal and the difference in the travel lengths between the adjacent waveguides are generated from the differences in the length of the straight line parts. The large differences in the travel lengths are generated between the three-dimensional waveguides 4 to 6 within the range where the size of the substrate 1 permits, without being limited in shape. The higher resolving power is thus obtd.

55. 发明专利

JPH01308118A CABLE CONNECTING CLOSURE 失效
公开(公告)号：JPH01308118A
公开(公告)日：1989-12-12
申请号：JP13745388
申请日：1988-06-06
申请人： FUJIKURA LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YOKOSUKA HIROSHI , NOMURA YOSHIKAZU , JINBO KUNIHIKO , OGATA KAZUYA , HINOHARA TSUNEHITO , HIRATA MASAHITO , KATSUSE MITSUYOSHI , TAKAHASHI HIROSHI , KOSUGI KENJI
IPC分类号： H02G15/10 , H02G15/113
摘要： PURPOSE:To enhance air-tightness by engaging a piece with a hook rotatably by means of a pin, and by contriving the prevention or the like of the deformation of a sleeve. CONSTITUTION:A groove 23 between the ribs 22 of a sleeve 10 for covering a cable connecting section 1 is wound up with a hand 6, and the pin 15 of a piece 13A is engaged with a hook 11A. After that, a piece 13B is brought near a large diameter section 18, and with the center of the pin 15 of the piece 13A, a bolt 14 is rotationally moved, and is set in the direction of the tangential line of the sleeve 10, and the piece 13B is set in front of a hook 11B. Then, the bolt 14 is rotated, and by moving the piece 13A fitted spirally on a male screw section 19, and the bolt 14 relatively, the pieces 13A and 13B are made to approach each other, and between both the hooks 11A, 11B, a fastening force is worked. Accordingly, on the overall length of the sleeve 10, a uniform pressing force is worked, and the sealed mechanism of high reliability is set, and the band 6 is fitted on the groove section 23, and the sleeves 10, 10 can be prevented from being deformed.

56. 发明专利

JPS60255646A OPTICAL FIBER OF QUARTZ 失效
公开(公告)号：JPS60255646A
公开(公告)日：1985-12-17
申请号：JP11543583
申请日：1983-06-27
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA KAZUAKI , TAKAHASHI HIROSHI , OOKUBO KATSUHIKO , INAGAKI NOBUO , NAKAHARA MOTOHIRO
IPC分类号： C03C13/04 , G02B6/00 , G02B6/02
摘要： PURPOSE:Quartz optical fiber that is composed of the quartz core containing fluorine and the quartz clad, thus showing reduced transmission loss. CONSTITUTION:In an optical fiber which is composed of a quartz core and a quartz clad, the core is allowed to include fluorine. The fluorine-doped quartz has a lower Rayleigh scattering factor than the quartz of high purity or quartz doped with GeO2O, P2O5 or Al2O3. Further, when hydroxyl groups remain, absorption loss takes place mainly in wavelengthes of 0.95, 1.24, and 1.39mu and the fluorine-doped quartz can more easily dehydroxylate than in the quartz doped with other substances and the content can be made almost zero. Thus, the quartz fiber having the core including fluorine shows reduced transmission loss, especially when it is doped so that difference in refraction index becomes 0.01%, the effect of low hydroxylation becomes remarkable, the transmission properties are further improved.

57. 发明专利

JPS56137457A BLOCK TRANSFER SYSTEM OF FILE 失效
公开(公告)号：JPS56137457A
公开(公告)日：1981-10-27
申请号：JP4016680
申请日：1980-03-31
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE , NIPPON ELECTRIC CO , HITACHI LTD , FUJITSU LTD
发明人： KAWAMURA KATSUHIKO , YAMADA YOSHIFUMI , MORIZAKI MASATO , HIRANO SHIGEKI , HASHIMOTO TADAO , TAKAHASHI HIROSHI
IPC分类号： G06F12/00 , G06F13/00 , G06F17/30
摘要： PURPOSE:To increase transfer efficiency with a simple constitution, by attaching bit map which represents that each record in the block is a real or vacant record at the head of transfer data, and transferring the real record only subsequently. CONSTITUTION:The block readout device BR reads out the data for one block's share from the file FA via the file input controller FI when the transfer request of data is present, to discriminate whether the real record or vacant record is present. To the bit map memory BM1, 0 is fed when real record and 1 is given with vacant record, and real record only is stored in the record memory RM1. When the processing of one block is finished, the format FM assembler FC adds the real record train read out from RM1 to the bit map at the head and feeds it to the reception side via the data communication network DCN. At the reception side, FM separator FD stores the bit map to BM2 and the real record to RM2 and writes in the real and vacant records to the file FB at the block write-in device according to the bit map.

58. 发明专利

JPS5596433A OBSERVATION OF CORE OF OPTICAL FIBER 失效
公开(公告)号：JPS5596433A
公开(公告)日：1980-07-22
申请号：JP436279
申请日：1979-01-17
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： TAKADA HISAO , TAKAHASHI HIROSHI , NAKAMURA KAZUNORI
IPC分类号： G01M11/00
摘要： PURPOSE:To observe the cores of optical fibers simply, speedily and accurately from the outside of the circumferential surface of the optical fibers, by applying X- rays to the optical fibers, and analyzing the distribution of strength of permeated X-rays which depends upon the mass absorption coefficients of components the optical fibers. CONSTITUTION:When optical fibers 1A, 1B are aligned with each other with respect to the cores 2a, 2b, X-rays are applied from an X-ray generator 3 to end portions of the optical fibers 1A, 1B, and the permeated rays are caught and displayed for observation by an optical system 4. In the permeated X-rays thus displayed, those portions of the cores 2a, 2b which have a high distribution density of Ge are seen in white color, and clad portions of the cores 2a, 2b which have a low distribution density of Ge are seen in black color. Namely, the displayed permeated X- rays show the condition of the condition of the cores 2a, 2b. Thus, the cores of optical fibers can be observed speedily and accurately from the outside of the circumferential surface of the optical fibers without accompanying technical difficulties.

59. 发明专利

JPS52154425A MECHANICAL AMPLIFYING MECHANISM 失效
公开(公告)号：JPS52154425A
公开(公告)日：1977-12-22
申请号：JP7141376
申请日：1976-06-17
申请人： NIPPON TELEGRAPH & TELEPHONE , YAMURA SHINKOSEISAKUSHO KK
发明人： TAKAHASHI TSUNEMATSU , KOBAYASHI MASATO , OOSHIDA ZENHACHI , TAKAHASHI HIROSHI
IPC分类号： B41J2/295 , B41J9/133 , B41J9/26 , F16H21/10

60. 发明专利

JPS52106223A QUESTION*ANSWER SYSTEM FOR TV LECTURE 失效
公开(公告)号：JPS52106223A
公开(公告)日：1977-09-06
申请号：JP2269376
申请日：1976-03-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： IGAWA SHIROU , TAKAHASHI HIROSHI , AIZAWA KIYOSHI
IPC分类号： G09B5/08 , G09B5/12 , H04N7/15 , H04N7/173
摘要： PURPOSE:The up-and down-signal lines are provided between lecture room and classroom, and questioning equipment is installed at the lecture room side. In this way, question and answer can be carried out between lecture and classroom through signal lines.

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