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    1.
    发明专利
    未知

    公开(公告)号：DE60206428D1

    公开(公告)日：2005-11-10

    申请号：DE60206428

    申请日：2002-02-19

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： ENOMOTO TADASHI ,  OHGA YUICHI ,  AKAIKE NOBUYA ,  AIKAWA HARUHIKO

    IPC: G02B6/00 ,  C03B8/04 ,  C03B37/012 ,  C03B37/014

    Abstract: A method of forming a silica soot preform comprising: forming a primary soot preform (102) on an outer periphery of a glass rod (101) by a primary burner (104); and forming a secondary soot preform by a secondary burner (103) on an outer periphery the primary soot preform, wherein a diameter of the primary soot preform is set to be ranged from twice to five times of a diameter of the glass rod, a thickness of the secondary soot preform is set to be range from 1.5 times to seven times of that of the primary soot preform. Consequently, the deposition rate with respect to the introduction of the raw material gas is considerably increased. Further, it is possible to maximize a performance of depositing the primary soot preform.

    Optical fiber grating element, production method thereof and optical fiber filter
    3.
    发明专利
    Optical fiber grating element, production method thereof and optical fiber filter 未知

    公开(公告)号：AU756788B2

    公开(公告)日：2003-01-23

    申请号：AU2003800

    申请日：2000-01-13

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： ENOMOTO TADASHI ,  ISHIKAWA SHINJI ,  SHIGEHARA MASAKAZU ,  HARUMOTO MICHIKO

    IPC: G02B6/14 ,  G02B6/26 ,  G02B6/34 ,  G02B6/16 ,  G02B6/10

    Abstract: The present invention relates to an optical fiber grating element having structure enabling more precise design and fabrication, a production method thereof, and an optical fiber filter including the same. The optical fiber grating element according to the present invention comprises a multi-mode optical fiber having a first core region of a refractive index n1, a second core of a refractive index n2 provided on a periphery of the first core region, and a cladding region of a refractive index n3 provided on a periphery of the second core region, and having a cutoff wavelength regarding to LP02-mode light on the longer wavelength side than a wavelength band in use. A long-period grating for selectively coupling the fundamental LP01-mode light of a predetermined wavelength in the wavelength band I use to LP0m (m>=2)-mode light is provided in a predetermined region of the first core region.

    5.
    发明专利
    未知

    公开(公告)号：DE69735566D1

    公开(公告)日：2006-05-18

    申请号：DE69735566

    申请日：1997-06-10

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： ITO MASUMI ,  IKEJI MAKI ,  ENOMOTO TADASHI

    IPC: G02B6/02 ,  G02B6/24

    Abstract: This invention relates to an optical fiber grating and a method of manufacturing the same. According to the method, a hydrogen doping process is performed before ultraviolet irradiation in order to obtain a sufficient photoinduced refractive index change. In particular, a target for the hydrogen doping process of the method is characterized by a coated fiber obtained by covering the outer surface of the bared fiber having a core region and a cladding region with the resin. After the coated fiber is exposed in a hydrogen atmosphere in a predetermined pressurized state for a predetermined period of time, the resin is partially removed. An ultraviolet ray is irradiated on the predetermined area of the bared fiber from which the resin is removed, thereby forming a reflection grating in the core region. The method is also characterized in that the pressure of the hydrogen atmosphere is reduced from the pressurized state while adjusting the pressure reducing rate. Degradation of the bared fiber surface can be prevented, and generation of bubbles or the like between the bared fiber and the resin coating can also be prevented, thereby obtaining an optical fiber grating with high reliability.

    OPTICAL FIBER GRATING DEVICE
    7.
    发明专利
    OPTICAL FIBER GRATING DEVICE 未知

    公开(公告)号：CA2390210A1

    公开(公告)日：2002-04-25

    申请号：CA2390210

    申请日：2001-08-31

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： ENOMOTO TADASHI ,  TAKUSHIMA MICHIKO ,  ISHIKAWA SHINJI ,  SHIGEHARA MASAKAZU

    IPC: G02B5/18 ,  G02B6/02 ,  G02B6/036 ,  G02B6/10 ,  G02B6/34 ,  G02B6/16

    Abstract: An optical fiber grating device (1) comprising an optical fiber (10) that ha s a core region (11) having an index of refraction n1 and an outside diameter 2a and having a long-period grating (14), a first clad region (12) surrounding the core region (11) and having an index of refraction n2 and an outside diameter 2b, and a second clad region (13) surrounding the first clad region (12) and having an index of refraction n3 and an outside diameter 2c. The relationship among the indexes of refraction n1, n2, n3 is n1>n2>n3. T he relative refractive-index difference .DELTA.n2 of the first clad region (12) with respect to the second clad region (13) is 0.5 % or more. The thickness (c- b) of the second clad region (13) with respect to the cutoff peak wavelength .lambda. ranges from .lambda. to 10.lambda..

    9.
    发明专利
    未知

    公开(公告)号：DE69603441T2

    公开(公告)日：1999-12-16

    申请号：DE69603441

    申请日：1996-10-22

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： OHGA YUICHI ,  ISHIKAWA SHINJI ,  ENOMOTO TADASHI

    IPC: G02B6/00 ,  C03B37/027 ,  C03C3/06 ,  C03C13/04 ,  G02B6/02

    Abstract: A glass body for optical fiber containing GeO2-SiO2 glass in a core portion thereof, in which the GeO2-SiO2 glass has an absorbance at 5.16 eV of at least 1/mm but not higher than 2.5/mm or in which concentration of Ge contained in the GeO2-SiO2 glass substantially lies within the range of 1.1 x 10 to 2.8 x 10 mol/mm as calculated by the following general equation: wherein A is absorbance which is expressed by A = -log T (T being transmittance) and normalized per 1 mm of optical path length, C(Ge2+) is Ge concentration, epsilon 5.16ev is absorption coefficient (l/mol/cm), and l is optical path length. This invention is also directed to the use of such a glass body, an optical fiber and a method of preparing it.

    Optical fiber grating and method of manufacturing the same
    10.
    发明专利
    Optical fiber grating and method of manufacturing the same 未知

    公开(公告)号：AU2479897A

    公开(公告)日：1997-12-18

    申请号：AU2479897

    申请日：1997-06-10

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： ITO MASUMI ,  IKEJI MAKI ,  ENOMOTO TADASHI

    IPC: G02B6/24 ,  G02B5/18 ,  G02B27/44 ,  C03C25/00

    Abstract: This invention relates to an optical fiber grating and a method of manufacturing the same. According to the method, a hydrogen doping process is performed before ultraviolet irradiation in order to obtain a sufficient photoinduced refractive index change. In particular, a target for the hydrogen doping process of the method is characterized by a coated fiber obtained by covering the outer surface of the bared fiber having a core region and a cladding region with the resin. After the coated fiber is exposed in a hydrogen atmosphere in a predetermined pressurized state for a predetermined period of time, the resin is partially removed. An ultraviolet ray is irradiated on the predetermined area of the bared fiber from which the resin is removed, thereby forming a reflection grating in the core region. The method is also characterized in that the pressure of the hydrogen atmosphere is reduced from the pressurized state while adjusting the pressure reducing rate. Degradation of the bared fiber surface can be prevented, and generation of bubbles or the like between the bared fiber and the resin coating can also be prevented, thereby obtaining an optical fiber grating with high reliability.

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