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    24.
    发明专利
    未知

    公开(公告)号：DE69714378T2

    公开(公告)日：2002-11-14

    申请号：DE69714378

    申请日：1997-10-21

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： STRASSER THOMAS A ,  WAGENER JEFFERSON LYNN

    IPC: G02B6/02 ,  G02B6/34 ,  G02B6/42 ,  G02B6/12 ,  G02B6/16

    Abstract: A dispersive optical wave guide tap comprises a blazed and chirped refractive index grating (14) in the core of the waveguide (12), coupling means (15) and utilization means (19). The grating is selected such that guided mode light of predetermined wavelength will, in the absence of the coupling means, be directed into one or more cladding modes of the waveguide. The presence of the coupling means in optical cooperation with the waveguide, changes the guiding conditions such that the cladding modes are substantially eliminated from a portion of the waveguide that includes the cladding, whereby the grating directs the guided mode light into one or more radiation modes. The blaze angle typically is ≤15 DEG . The chirp serves to bring the radiation mode light substantially to a focus in at least one dimension, the focal point (or line) depending on the wavelength of the light. The utilization means exemplarily comprise an array of photodetectors, and the coupling means exemplarily comprise an appropriately shaped glass member and index matching means. Dispersive waveguide taps are advantageously used in WDM optical communication systems, e.g., to provide status information (e.g., channel wavelength, channel power, including presence or absence of a channel) to, e.g., a system maintenance unit. The status information facilitates maintenance of operating conditions by conventional feedback control.

    25.
    发明专利
    未知

    公开(公告)号：DE69801632T2

    公开(公告)日：2002-06-27

    申请号：DE69801632

    申请日：1998-11-03

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ABRAMOV ANATOLI A ,  HALE ARTURO ,  MOCK JOEL LESLIE ,  STRASSER THOMAS A ,  VENGSARKAR ASHISH MADHUKAR

    IPC: G02B26/00 ,  G02F1/313 ,  H04B10/02 ,  H04B10/152 ,  H04J14/00 ,  H04J14/02 ,  H04B10/08

    Abstract: Apparatus for monitoring multi-wavelength optical systems includes an optical fiber system (44) and apparatus (42) for separating the different wavelengths of transmitted light transmitted therethrough and for monitoring the respective optical power in the separated spectral components. More specifically, embodiments of the invention scan or modify the physical parameters of in-fiber gratings (46) that couple light between spatially different modes of light within a wavelength-division-multiplexed optical fiber system, separate the spatial modes using a mode-discriminating device (47) and monitor or detect the separated spectral components using a conventional or other suitable detector (48). By scanning the in-fiber gratings, the peak wavelength of coupling between two dissimilar modes is modified, thus allowing control of the coupling within the fiber optic system. Scanning the grating is performed, for example, by changing the temperature or modifying the physical dimensions of the grating. In one embodiment, the system employs a long-period grating that couples light between two co-propagating, spatially different modes. In an alternative embodiment, the system uses a short-period grating that couples light between a forward propagating mode and a spatially dissimilar, backward propagating mode.

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