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    • 8. 发明授权
    • Article comprising an optional waveguide tap
    • 该产品包括一个可选的波导管
    • US06002822A
    • 1999-12-14
    • US88512
    • 1998-06-01
    • Thomas A. StrasserJefferson Lynn Wagener
    • Thomas A. StrasserJefferson Lynn Wagener
    • G02B6/02G02B6/34G02B6/42
    • G02B6/29323G01J3/1895G02B6/02085G02B6/29358G02B6/29359G02B6/34G02B6/4215G02B6/4291G02B6/02138G02B6/4274
    • A dispersive optical waveguide tap comprises a blazed refractive index grating in the core of the waveguide, coupling means, focusing means and utilization means. 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 co-operation 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 .ltoreq.15.degree.. The focusing means serve 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. Any optical element that can bring the tapped radiation to a focus on the utilization means can serve as a focusing element. Exemplary focusing elements are optical lenses (cylindrical or non-cylindrical), diffraction gratings, volume gratings (holograms), and combinations thereof.
    • 分散光波导抽头包括波导芯体中的闪耀折射率光栅,耦合装置,聚焦装置和利用装置。 选择光栅使得在没有耦合装置的情况下,预定波长的导模光将被引导到波导的一个或多个包层模式。 耦合装置在与波导的光学协作中的存在改变了引导条件,使得包层模式基本上从包括包层的波导的一部分消除,由此光栅将引导模式的光引导到一个或 更多的辐射模式。 火焰角通常为