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125 records (took 0.026 seconds)

    31.
    发明专利
    未知

    公开(公告)号：BR9707059A

    公开(公告)日：1999-07-20

    申请号：BR9707059

    申请日：1997-01-21

    Applicant: CORNING INC

    Inventor： HENSERSON DANNY LEE ,  LI MING-JUN ,  NOLAN DANIEL A ,  WASHBURN GLENDEA R

    IPC: G02B6/00 ,  C03B37/027 ,  C03B37/03 ,  G02B6/02 ,  G02B6/024

    Abstract: The invention provides improved methods for reducing polarization mode dispersion (PMD) in single mode fiber by spinning the fiber during the drawing process in accordance with a spin function having sufficient harmonic content to achieve low levels of PMD for commercial fibers for which the beat lengths of the fibers, including the beat lengths of different portions of the fibers, are variable and thus not readily known in advance. The spin functions of the invention take advantage of certain resonances in energy transfer between polarization modes to achieve substantial reductions in PMD for a wide range of beat lengths. Examples of suitable spin functions include frequency-modulated and amplitude-modulated sine waves.

    TWO-CORE OPTICAL FIBERS FOR DISTRIBUTED FIBER SENSORS AND SYSTEMS
    32.
    发明专利
    TWO-CORE OPTICAL FIBERS FOR DISTRIBUTED FIBER SENSORS AND SYSTEMS 未知

    公开(公告)号：CA2920157C

    公开(公告)日：2020-08-18

    申请号：CA2920157

    申请日：2013-08-01

    Applicant: CORNING INC

    Inventor： HOOVER BRETT JASON ,  LI MING-JUN ,  LI SHENPING

    IPC: G01J5/08 ,  G01D5/353 ,  G01K11/32 ,  G02B6/02

    Abstract: A two-core optical fiber is provided for use in Brillouin distributed fiber sensor applications and systems. The two-core fiber includes a first and second core. Each core is configured to exhibit a Brillouin frequency shift greater than 30 Mhz relative to the other core. Further, each core possesses temperature and strain coefficients that differ from the other core. The cores can be configured to produce Brillouin frequency shift levels of at least 30 Mhz relative to one another. These differences in shift levels may be effected by adjustment of the material compositions, doping concentrations and/or refractive index profiles of each of the cores. These optical fibers may also be used in BOTDR- and BOTDA based sensor systems and arrangements.

    MULTICORE FIBER CROSSTALK SENSOR
    33.
    发明专利
    MULTICORE FIBER CROSSTALK SENSOR 未知

    公开(公告)号：CA3065175A1

    公开(公告)日：2020-07-11

    申请号：CA3065175

    申请日：2019-12-16

    Applicant: CORNING INC

    Inventor： LI MING-JUN

    IPC: G01B11/16 ,  G01D5/32 ,  G01K11/32 ,  G02B6/036

    Abstract: An optical fiber sensor with high sensitivity and high spatial resolution is described. The optical fiber sensor includes a multicore fiber having cores configured to permit crosstalk between cores. Crosstalk corresponds to transfer of an optical signal from a core to another core and is used as a mechanism for sensing the external environment surrounding the multicore optical fiber. The degree of crosstalk depends on the relative refractive index profile of the cores and surrounding cladding, as well as on the spacing between cores. The external environment surrounding the multicore optical fiber and changes therein influence crosstalk between cores to permit sensing. The relative refractive index profiles of the cores are also configured to provide a group delay difference for optical signals propagating in different cores. The group delay difference facilitates the position of an external perturbation along the length of the multicore optical fiber.

    ОПТИЧЕСКОЕ ВОЛОКНО С НИЗКИМ ЗАТУХАНИЕМ
    34.
    发明专利
    ОПТИЧЕСКОЕ ВОЛОКНО С НИЗКИМ ЗАТУХАНИЕМ 未知

    公开(公告)号：RU2723407C2

    公开(公告)日：2020-06-11

    申请号：RU2017123207

    申请日：2015-11-30

    Applicant: CORNING INC

    Inventor： TANDON PUSHKAR ,  REDING BRUCE WARREN ,  LI MING-JUN ,  BOOKBINDER DANA CRAIG

    IPC: C03B37/027

    Abstract: Группаизобретенийотноситсяк способусниженияфиктивнойтемпературыоптическоговолокна, оптическомуволокну, устройствамдляобработкиоптическоговолокна. Техническимрезультатомявляетсяснижениефиктивнойтемпературы. Способсниженияфиктивнойтемпературыоптическоговолокнавключаетэтап, накоторомтемпературуоптическоговолокнаподдерживаютмежду 1000°C и 1700°C втечениепериодавремени, составляющегопоменьшеймере 0,5 с. Приэтомскоростьвытяжениясоставляетболее 30 м/с. Устройстводляобработкиоптическоговолокнасодержитнагреваемуюобластьобработки, выполненнуюс возможностьюприемаоптическоговолокна, перемещаемогов первомнаправленииперемещения. Областьобработкивключаетв себяпервуюзону, выполненнуюс возможностьюподдержанияоптическоговолокнаприпервойтемпературемежду 1000°C и 1700°C. Попервомувариантуперваязонавключаетв себяпервыйпневмогидравлическийподшипник, выполненныйс возможностьюперенаправленияоптическоговолокнас первогонаправленияперемещениянавтороенаправлениеперемещения. Первыйпневмогидравлическийподшипникосуществляетперенаправлениес первогонаправленияперемещениянавтороенаправлениеперемещениябезнепосредственногоконтактас оптическимволокном. Повторомувариантуустройствосодержитобластьобработки, котораявключаетв себяодинилиболеенагреваемыхпневмогидравлическихподшипников, которыевыполненыс возможностьюприемаи перемещенияоптическоговолокна. Потретьемувариантунагреваемыйпневмогидравлическийподшипникимееттемпературумежду 500°C и 1500°C. Такжегруппаизобретенийвключаетоптическоеволокно, выполненноепоспособусниженияфиктивнойтемпературыоптическоговолокна. 5 н. и 22 з.п. ф-лы, 9 ил.

    fibra óptica com baixa perda por curvatura.
    37.
    发明专利
    fibra óptica com baixa perda por curvatura. 未知

    公开(公告)号：BR112012020042A2

    公开(公告)日：2016-05-10

    申请号：BR112012020042

    申请日：2011-02-22

    Applicant: CORNING INC

    Inventor： BOOKBINDER DANA C ,  LI MING-JUN ,  TANDON PUSHKAR

    IPC: G02B6/036

    Abstract: fibra óptica com baixa perda por curvatura. trata-se de uma fibra óptica com baixa perda por macro e microcurvatura. a fibra possui uma primeira região de revestimento interna, com raio externo r~2~ > 8 1 m e índice de refração ~2~, e uma segunda região de revestimento externa que circunda a região de revestimento interna, com índice de refração. ~3~, onde ~1~ > ~3~ > ~2~. a diferença entre ~3~ e ~2~ é maior que 0,01. a fibra apresenta um corte de cabo 22 m menor ou igual a 1.260 nm e r~1~/r~2 maior ou igual a 0,25.

    39.
    发明专利
    未知

    公开(公告)号：DE69730945D1

    公开(公告)日：2004-11-04

    申请号：DE69730945

    申请日：1997-01-21

    Applicant: CORNING INC

    Inventor： HENDERSON L ,  LI MING-JUN ,  WASHBURN R ,  NOLAN A

    IPC: G02B6/00 ,  C03B37/027 ,  C03B37/03 ,  G02B6/02 ,  G02B6/024 ,  G02B6/16

    Abstract: The invention provides improved methods for reducing polarization mode dispersion (PMD) in single mode fiber by spinning the fiber during the drawing process in accordance with a spin function having sufficient harmonic content to achieve low levels of PMD for commercial fibers for which the beat lengths of the fibers, including the beat lengths of different portions of the fibers, are variable and thus not readily known in advance. The spin functions of the invention take advantage of certain resonances in energy transfer between polarization modes to achieve substantial reductions in PMD for a wide range of beat lengths. Examples of suitable spin functions include frequency-modulated and amplitude-modulated sine waves.

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