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    • 7. 发明公开
    • Optical bandpass filter using long period gratings
    • 使用长周期光栅的光学带通滤波器
    • EP1271194A2
    • 2003-01-02
    • EP02014330.1
    • 2002-06-27
    • FITEL USA CORPORATION (a Delaware Corporation)
    • Ramachandran, Siddarth
    • G02B6/124G02B6/293H01S5/10H01S3/067
    • G02B6/02095G02B6/12007G02B6/14G02B6/255G02B6/29319G02B6/29389G02B6/4215G02B2006/12107H01S3/0675H01S3/08027H01S3/139
    • The specification describes an optical filter wherein long period gratings (LPGs) (12,14) are used in a new configuration to provide in-line bandpass filtering of optical signals. In the basic embodiment, two dissimilar LPGs are installed in the optical fiber transmission line. The first LPG (12) converts light, over a broad wavelength range, being transmitted in the fundamental, or LP 01 , mode of the optical fiber transmission line into light in a higher order mode (HOM) of the optical fiber. The mode-converted signal, with mode LP m , n . is then coupled to a second waveguide (13), the second waveguide having transmission characteristics different from those of the first. The second waveguide supports propagation of light in a LP m,n mode. The mode-converted signal is then transmitted through a second LPG where the signal over a selected narrow band of wavelengths that is accepted by the second LPG is converted back to a LP 01 mode. The selected narrow band in the LP 01 mode propagates efficiently over the remainder of the optical fiber transmission path.
    • 该说明书描述了一种光学滤波器,其中长周期光栅(LPG)(12,14)被用于新配置以提供光信号的在线带通滤波。 在基本实施例中,两个不同的LPG安装在光纤传输线中。 第一LPG(12)将在宽波长范围内的光在光纤传输线的基本模式或LP01模式中转换为光纤的高阶模式(HOM)中的光。 模式转换信号,模式为LPm,n。 然后耦合到第二波导(13),第二波导具有与第一波导不同的透射特性。 第二个波导支持LPm,n模式的光传播。 模式转换的信号然后通过第二LPG传输,其中在第二LPG接受的选定窄波段上的信号被转换回LP01模式。 LP01模式中的选定窄带在光纤传输路径的其余部分高效传播。