| 摘要 |
A coupler disposed between two sections of optical signal transmission line for extracting from one of the sections a fraction of the energy transmitted thereby. The coupler comprises first and second 45 DEG right prisms which are so disposed that the large area planar surfaces thereof are slightly spaced and are parallel. Disposed between the prisms is a sheet of transparent material having a refractive index lower than the refractive indices of the prisms. The transparent sheet is slidably disposed between the two prisms so that it can easily be replaced by another sheet having a different refractive index. Input light from one of the sections of transmission line is coupled to one of the prisms and impinges upon the prism-sheet interface at such an angle that a fraction of the input light reflects from the interface and is thus extracted from the optical signal transmission line. The remainder of the input light passes through the sheet of transparent material into the second prism, and after propagating therethrough, is coupled to the second section of optical signal transmission line.
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