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    • 4. 发明授权
    • Tunable optical filter
    • 可调滤光片
    • US06529326B2
    • 2003-03-04
    • US09879033
    • 2001-06-13
    • Bo Cai
    • Bo Cai
    • G02B2728
    • G02B6/29302G02B6/266G02B6/272G02B6/2766G02B6/2773G02B6/29395G02B27/28H04B10/2941Y10S359/90
    • The invention provides an optical filter having first wave retarding element for receiving an optical signal including a plurality of wavelengths, said first wave retarding element having a first periodic output response of a first phase versus wavelength for the optical signal. The optical signal is polarized when being launched into the first wave retarding element. A second wave retarding element receives the optical signal from the first wave retarding element. The second wave retarding element has a second periodic output response of a second phase versus wavelength for the optical signal. The first periodic output response and the second periodic output response are different from each other and non-integer multiples of each other. Advantageously, the gain flattening filter is tunable, cost effective, and compact in size. It is capable of producing any desired spectral curve without PDL by simply adjusting the angle of each wave retarding means. PMD and broadening is eliminated by orthogonal two-stage configuration.
    • 本发明提供了一种滤光器,其具有用于接收包括多个波长的光信号的第一波阻容元件,所述第一波延迟元件具有第一相位相对于光信号的波长的第一周期性输出响应。 当发射到第一阻波元件时,光信号被极化。 第二阻波元件从第一阻波元件接收光信号。 第二波延迟元件具有针对光信号的第二相位对波长的第二周期性输出响应。 第一周期性输出响应和第二周期性输出响应彼此不同,并且彼此的非整数倍。 有利地,增益平坦化滤波器是可调谐的,成本有效的并且尺寸紧凑。 通过简单地调整每个阻波装置的角度,能够产生没有PDL的任何期望的光谱曲线。 通过正交两级配置消除了PMD和拓宽。