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    • 15. 发明公开
    • Saturable absorption type optical switch and controlling method therefor
    • Optischer Schalter vomsättigbarenAbsorptionstyp und Steuerungsverfahrendafür
    • EP0942319A2
    • 1999-09-15
    • EP99301924.9
    • 1999-03-12
    • NEC CORPORATION
    • Watanabe, SeijiYamaguchi, Shohei
    • G02F1/35
    • G02F1/3515G02F1/3523
    • An optical switch includes a saturable absorption type optical element provided with a saturable absorption region, and a band-block optical filter to which signal light composed of at least one wavelength light having an optical power in the absorption region of the saturable absorption type optical element and control light whose optical power is set such that a total power of the signal light and the control light comes within a transmission region of the saturable absorption type optical element and which is composed of either one of two wavelength lights different from that of the signal light are inputted and which transmits therethrough the signal light and the control light which is composed only of one of the wavelength lights and outputs the transmitted signal light and control light to the saturable absorption type optical element. ON/OFF of the signal light is controlled by varying the wavelength of the control light.
    • 光开关包括设置有可饱和吸收区域的可饱和吸收型光学元件,以及带状滤光器,其中由可饱和吸收型光学元件的吸收区域中具有光焦度的至少一种波长光组成的信号光 以及控制光,其光功率被设定为使得信号光和控制光的总功率进入可饱和吸收型光学元件的透射区域内,并且由与信号不同的两个波长光中的任一个组成 光被输入并且通过其中的信号光和仅由波长光之一组成的控制光,并将透射信号光输出到可饱和吸收型光学元件。 通过改变控制光的波长来控制信号光的ON / OFF。