| 摘要 |
A switchable coupler ( 10 ) has a first waveguide ( 15 ) defining an inlet port ( 31 ) for a first unpolarized light input (A) and a first outlet port ( 32 ), and also a second waveguide ( 16 ) defining an inlet port ( 41 ) for a second unpolarized light input ( 13 ) and a second outlet port ( 42 ). Polarization splitter devices ( 11, 12 ) and two electro-optical switches ( 13,14 ) are sandwiched between the waveguides ( 15, 16 ). The polarization splitter devices ( 11, 12 ) are positioned to split the light inputs (A and B) into respective refracted and reflected polarized components (A<SUB>L </SUB>and A<SUB>F</SUB>; B<SUB>L </SUB>and B<SUB>F</SUB>), and the electro-optical switch ( 13 ) is operable by the application across it of a potential difference (+V) to recombine the polarized components (B<SUB>L</SUB>, B<SUB>F</SUB>) and to couple them with the light output A<SUB>T </SUB>through the first outlet port ( 32 ). As shown in FIG. ( 7 ), the electro-optical switch ( 14 ) is alternatively operable by the application across it of the potential difference (+V) to recombine the polarized components (A<SUB>L</SUB>, A<SUB>F</SUB>) and to couple them with the light output B<SUB>T </SUB>through the second outlet port ( 42 ).
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