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    • 8. 发明申请
    • Optical switch device
    • 光开关器件
    • US20050128585A1
    • 2005-06-16
    • US11047743
    • 2005-02-02
    • Takashi YamaneToshiya KishidaManabu Komiyama
    • Takashi YamaneToshiya KishidaManabu Komiyama
    • G02B6/34G02B5/30
    • G02F1/31G02B6/272G02F1/1347G02F2001/13355G02F2203/06
    • Light incident on an input optical fiber is separated into p-polarized light and s-polarized light by a birefringent crystal. A voltage to be applied to a liquid crystal element having electrodes associated with the ray axes of the polarized light waves is controlled in order to convert the p-polarized light into s-polarized so that both the polarized light waves will be s-polarized light. Otherwise, the s-polarized light is converted into p-polarized light so that both the polarized light waves will be p-polarized light. A polarized-wave separation film located behind the liquid crystal element transmits p-polarized light and reflects s-polarized light. When both the polarized light waves propagated through the liquid crystal element are s-polarized light, the light reflected from the polarized-wave separation film is reflected from a total-reflection film, and reflected again from the polarized-wave separation film. The resultant light falls on the birefringent crystal again via the liquid crystal element, and is restored to non-polarized light by the birefringent crystal. The non-polarized light then falls on a first output optical fiber. In contrast, when both the polarized light waves propagated through the liquid crystal element are p-polarized light, the p-polarized light is transmitted by the polarized-wave separation film, and then restored to non-polarized light after falling on the birefringent crystal via another liquid crystal element. The resultant light then falls on a second output optical fiber.
    • 入射到输入光纤的光被双折射晶体分离成p偏振光和s偏振光。 控制施加到具有与偏振光的射线轴相关联的电极的液晶元件的电压,以便将p偏振光转换成s偏振光,使得两个偏振光将是s偏振光 。 否则,s偏振光被转换成p偏振光,使得两个偏振光都将是p偏振光。 位于液晶元件后面的偏振波分离膜透过p偏振光并反射s偏振光。 当通过液晶元件传播的两个偏振光都是s偏振光时,从偏振波分离膜反射的光从全反射膜反射,并从偏振波分离膜再次反射。 所得到的光通过液晶元件再次落在双折射晶体上,并通过双折射晶体恢复为非偏振光。 然后,非偏振光落在第一输出光纤上。 相反,当通过液晶元件传播的两个偏振光都是p偏振光时,p偏振光被偏振波分离膜透射,然后在落在双折射晶体上后恢复为非偏振光 通过另一液晶元件。 所得到的光然后落在第二输出光纤上。