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    ELLIPSOMETRE SPECTROSCOPIQUE A FAIBLE BRUIT
    35.
    发明授权
    ELLIPSOMETRE SPECTROSCOPIQUE A FAIBLE BRUIT 有权
    OUT CHARM分光椭率

    公开(公告)号：EP1290417B1

    公开(公告)日：2009-03-04

    申请号：EP01945381.0

    申请日：2001-06-08

    Applicant: Fahrenheit Thermoscope LLC

    Inventor： FERRIEU, Frédéric

    IPC: G01J4/00 ,  G01N21/21

    CPC classification number: G01J4/00 ,  G01N21/211

    Abstract: The invention concerns a spectroscopic ellipsometer comprising a light source (1) emitting an optical beam, a polarizer (2) arranged on the path of the optical beam emitted by the light source, a sample holder (9) receiving the optical beam from the polarizer output, a polarisation analyser (3) designed to be traversed by the beam reflected by the sample to be analysed, a detection set which receives the beam from the analyser output and which comprises a monochromator (5) and a photodetector (4), means (6) for processing the signal in said detection set output, which include an electronic counter (13). Cooling means (12) maintain the detection set at a temperature lower than room temperature, minimising the noise of the detector so as to be constantly in the condition of minimum photon noise. The optimal measuring condition of the ellipsometer is reached by minimising all the sources of noise (lamps, detection, ambient noise).

    METHOD OF EVALUATING FIBER PMD USING POTDR TRACE
    37.
    发明公开
    METHOD OF EVALUATING FIBER PMD USING POTDR TRACE 审中-公开
    方法进行评估光纤的PMD通过使用POTDR轨迹

    公开(公告)号：EP1929266A1

    公开(公告)日：2008-06-11

    申请号：EP06801292.1

    申请日：2006-08-14

    Applicant: Corning Incorporated

    Inventor： CHEN, Xin ,  HERON, Nicol A

    IPC: G01M11/02 ,  G01J4/00

    CPC classification number: G01M11/3181

    Abstract: A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer is disclosed. A pulse radiation is emitted into an end of the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain an OTDR trace. A pulse radiation is emitted into an opposite end of the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain another OTDR trace. Either one or both traces are analyzed to compare the variation of intensity of signals along the length of the fiber, the variation in signals relating to the PMD along the length of the fiber.

    DIFFERENTIAL OPTICAL TECHNIQUE FOR CHIRAL ANALYSIS
    38.
    发明公开
    DIFFERENTIAL OPTICAL TECHNIQUE FOR CHIRAL ANALYSIS 审中-公开
    光个别技术促进CHIRALANALYSE

    公开(公告)号：EP1676107A4

    公开(公告)日：2008-03-26

    申请号：EP04794678

    申请日：2004-10-12

    Applicant: STHENO CORP

    Inventor： GIBBS PHILLIP R

    IPC: G01J4/00 ,  G01N21/19 ,  G01N21/21 ,  G02B20060101

    CPC classification number: G01N21/21 ,  G01N21/19

    Abstract: A differential method has been developed which determines displacement from a defined point of optical transmission (e.g., ±45° from null, or null 90° and parallel 0°) and utilizes the coupled nature of the two signals for common mode noise rejection and signal enhancement. A beam of light (104) is modulated (130), applied to the chiral mixture (140), and then split into a first beam (146) and a related orthogonal beam (148) by a polarizer or prism (142). The first beam (146) and orthogonal beam (148) are converted into electrical signals (150) (152) before a differential comparison (170) of the signals is performed to detect a desired chiral species within the chiral mixture.

    MICHELSON INTERFEROMETER BASED DELAY LINE INTERFEROMETERS
    39.
    发明公开
    MICHELSON INTERFEROMETER BASED DELAY LINE INTERFEROMETERS 审中-公开
    迈克尔逊干涉仪为基础的延迟线干涉仪

    公开(公告)号：EP1853886A2

    公开(公告)日：2007-11-14

    申请号：EP06736094.1

    申请日：2006-02-23

    Applicant: Optoplex Corporation

    Inventor： HSIEH, Yung-Chieh ,  AI, Chiayu ,  CHIEN, Chih-Hung ,  HU, Guojiang ,  SONG, Daryuan

    IPC: G01J4/00

    CPC classification number: H04B10/677

    Abstract: An interferometer includes a means for splitting, at a splitting location, an input light beam into a first beam and a second beam; and means for recombining, at a recombination location, the first beam and the second beam. The interferometer is designed such that the first beam will travel a first optical path length (OPL) from the splitting location to the recombination location, and the second beam will travel a second OPL from the splitting location to the recombination location and such that when the input light beam has been modulated at a data rate comprising a time interval, then the difference in optical path lengths between the first OPL and the second OPL is about equal to the time interval multiplied by the speed of light.

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