Thermoopic type variable optical attenuator and array type...

Details Thermoopic type variable optical attenuator and array type... Thermoopic type variable optical attenuator and array type...

2007-04-10

2007-04-10

Sanghavi, Hemang (Department: 2874)

Optical waveguides

Accessories

Attenuator

C385S028000, C385S029000, C385S043000

Reexamination Certificate

active

10568062

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 attenuator100using optical material having negative optical effect provides a multimode optical propagating part3disposed via a tapered part2and a tapered part7between single mode optical waveguides1and8. A thin-film heater4is disposed above the multimode optical propagating part3at an angle of inclination β in relation to the direction of light propagation along a first optical waveguide50. Moreover, a second optical waveguide9optically coupled with a side face3S1of the multimode optical propagating part3is provided at an angle of inclination2β in relation to the direction of light propagation along the first optical waveguide50.

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Noh, Y.O., et al., “PLC-Type Variable Optical Attenuator Operated at Low Electrical Power,” Electronics Letters, vol. 36, No. 24 (Nov. 2000) p. 2032-2033.
International Search Report, Nov. 22, 2004.
Noh, Y. O., et al., “PLC-Type Variable Optical Attenuator Operated at Low Electrical Power,” Electronics Letters vol. 36, No. 24 pp. 2032-2033.
Yang, M. S., et al., “Very Low Crosstalk 1×2 Digitial Optical Switch Integrated with Variable Attentuators,” Electronic Letters vol. 37, No. 9, pp. 587-588.

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