| 摘要 |
An optical waveguide device for multiplexing and demultiplexing transverse magnetic (TM) and transverse electric (TE) polarization modes. The device has two waveguides, having first and second coupler segments in close proximity to each other, but with the second coupler segment capable of supporting only one polarization mode. When both TE and TM modes are introduced into the first coupler segment, one mode is coupled completely across to the second coupler segment, but the mode not supported in that segment remains in the first segment and is transmitted to an output port. In the illustrative embodiment of the invention, this selective coupling of the polarization modes is achieved by choosing a narrow width for the second coupling segment, such that the TE polarization mode is not supported but the TM polarization mode is. The interaction length of the coupling segments is selected to produce complete coupling of the TM energy to the second coupling segment.
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