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    PRODUCTION OF ARTICLE HAVING OPTICAL FIBER REFRACTIVE INDEX GRATING
    1.
    发明专利
    PRODUCTION OF ARTICLE HAVING OPTICAL FIBER REFRACTIVE INDEX GRATING 失效

    公开(公告)号：JPH10123338A

    公开(公告)日：1998-05-15

    申请号：JP26596097

    申请日：1997-09-30

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ATKINS ROBERT MICHAEL ,  ESPINDOLA ROLANDO PATRICIO ,  SIMOFF DEBRA ANN

    IPC: G02B6/02 ,  G02B6/10 ,  G02B6/34

    Abstract: PROBLEM TO BE SOLVED: To make it possible to write refractive index gratings into an optical fiber which is as coated by preparing the specific silica-base optical fiber having a Ge-doped core exposed to a photosensitive agent and exposing this optical fiber to chemical rays in such a manner that the refractive index gratings are formed in the core. SOLUTION: The silica-base optical fiber 55 (having the core doped with the Ge) exposed to the photosensitive agent is prepd. This optical fiber 55 is exposed to the chemical rays 52 in such a manner that the gratings are formed in the core. The optical fiber 55 has a sufficient concn. of germanium oxide defect centers. This concn. is the concn. at which the fiber having the photosensitivity of at least 2 times and more preferably >=10 times the photosensitivity of the other optical fibers having the same performance may be provided. The photosensitivity is defined by Δn/(dosing quantity of the chemical rays) and Δn indicates the refractive index change by exposure of the optical fiber 55 to the prescribed quantity of the chemical rays 52.

    METHOD FOR DECIDING PERMEABILITY OF SHEET MATERIAL USING THERMOGRAVIMETRIC ANALYZER
    2.
    发明专利
    METHOD FOR DECIDING PERMEABILITY OF SHEET MATERIAL USING THERMOGRAVIMETRIC ANALYZER 失效

    公开(公告)号：JP2000314694A

    公开(公告)日：2000-11-14

    申请号：JP2000111049

    申请日：2000-04-12

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BAIR HARVEY EDWARD ,  POPIELARSKI STEPHEN REID ,  SIMOFF DEBRA ANN

    IPC: G01N1/28 ,  G01N5/04 ,  G01N15/08

    Abstract: PROBLEM TO BE SOLVED: To accurately measure in a short time by disposing a container filled with liquid or the like, sealed at its opening with a sheet to be measured and set under predetermined conditions in a thermogravimetric analyzer, and measuring a weight of the container as a function of a time. SOLUTION: Permeability of a sheet-like material is measured by using, for example, a thermogravimetric analyzer 100. First, a predetermined liquid such as, for example, water is filled in a container 12 made of a stainless steel or the like and having no permeability, and an opening of the container 12 is sealed with a sheet material to be measured by using a cover having a predetermined opening and a deformable material such as, for example, an O-ring or the like. The sealed container 12 is disposed in a container holder 114 in a chamber 110 under predetermined temperature and humidity or the like by supplying, for example, nitrogen. Thereafter, a weighing instrument 112 is used to continuously measure a weight of the container 12, for example, in order of several hours. Permeability is calculated by using obtained weight change per hour, a thickness of the material to be measured, an area of the opening of the cover, and vapor pressures in and out of the container 12.

    4.
    发明专利
    未知

    公开(公告)号：DE69728729D1

    公开(公告)日：2004-05-27

    申请号：DE69728729

    申请日：1997-09-30

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ATKINS ROBERT MICHAEL ,  SIMOFF DEBRA ANN ,  ESPINDOLA ROLANDO PATRICIO

    IPC: G02B6/02 ,  G02B6/10 ,  G02B6/34 ,  G02B6/16

    Abstract: The method of making an optical fiber refractive index grating comprises writing the grating through the fiber coating. The method involves providing optical fiber of significantly higher photosensitivity than conventional fiber, such that the grating can be written before unacceptable darkening of the coating occurs. Such fiber is H2 and/or D2-loaded silica-based fiber having a Ge-doped core, the fiber selected to have a germanium-oxygen deficiency center content that provides the fiber with a photosensitivity that is at least twice as large as that of an otherwise identical, conventionally prepared, optical fiber. The fiber typically is drawn from a preform, at least a portion of which was exposed to a reducing atmosphere at an elevated temperature.

    6.
    发明专利
    未知

    公开(公告)号：DE69728729T2

    公开(公告)日：2005-04-28

    申请号：DE69728729

    申请日：1997-09-30

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ATKINS ROBERT MICHAEL ,  SIMOFF DEBRA ANN ,  ESPINDOLA ROLANDO PATRICIO

    IPC: G02B6/02 ,  G02B6/10 ,  G02B6/34 ,  G02B6/16

    Abstract: The method of making an optical fiber refractive index grating comprises writing the grating through the fiber coating. The method involves providing optical fiber of significantly higher photosensitivity than conventional fiber, such that the grating can be written before unacceptable darkening of the coating occurs. Such fiber is H2 and/or D2-loaded silica-based fiber having a Ge-doped core, the fiber selected to have a germanium-oxygen deficiency center content that provides the fiber with a photosensitivity that is at least twice as large as that of an otherwise identical, conventionally prepared, optical fiber. The fiber typically is drawn from a preform, at least a portion of which was exposed to a reducing atmosphere at an elevated temperature.

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