Thermoopic type variable optical attenuator and array type variable optical attentuator using this
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United States of America Patent
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Apr 10, 2007
Grant Date -
N/A
app pub date -
Aug 10, 2004
filing date -
Aug 13, 2003
priority date (Note) -
Expired
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Abstract
A thermo optical type variable optical attenuator suitable for application in an array type variable optical attenuator that realizes low crosstalk between neighboring waveguides in the array is provided. A thermo optical type variable optical attenuator 100 using optical material having negative optical effect provides a multimode optical propagating part 3 disposed via a tapered part 2 and a tapered part 7 between single mode optical waveguides 1 and 8. A thin-film heater 4 is disposed above the multimode optical propagating part 3 at an angle of inclination .beta. in relation to the direction of light propagation along a first optical waveguide 50. Moreover, a second optical waveguide 9 optically coupled with a side face 3S1 of the multimode optical propagating part 3 is provided at an angle of inclination 2.beta. in relation to the direction of light propagation along the first optical waveguide 50.
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