Patent ID: 7046872
Filing Date: 2006-05-16
Classification: G02B,G02F

Abstract:
1. A two input two output type optical switch comprising four one input two output type optical switches which are arranged to oppose one another, each of said one input two output type optical switch comprising a Y branch portion in which one optical waveguide is branched into two optical waveguides, wherein: two refractive index adjustment means for switching over of an optical path by operating half of said refractive index adjustment means alternately said two refractive index adjustment means are provided in the vicinity of each said Y branch portion; and at least one of an input port or an output port has a light output intensity variable attenuation means which attenuates by any desired amount the intensity of the light which is being outputted is by operating at least one of said refractive index adjustment means which is not currently being used for switching over of said optical path.