High speed thermo-optic phase shifter and devices comprising...

Details High speed thermo-optic phase shifter and devices comprising... High speed thermo-optic phase shifter and devices comprising...

2005-08-02

2005-08-02

Font, Frank G. (Department: 2883)

Optical waveguides

With optical coupler

Particular coupling structure

C385S129000

Reexamination Certificate

active

06925232

ABSTRACT:
In accordance with the invention, a high speed thermo-optic phase shifter comprises a length of optical waveguide including a waveguiding core of a first material having an index of refraction n1and a first order temperature dependence |dn1/dT| and, optically coupled to the core, a length of a second material having an index n2preferably greater than the core (n2>n1) and a first order temperature dependence |dn2/dT| than the core (|dn2/dT|>|dn1/dT|). Advantageously, the length of second material is adiabatically tapered at both ends. Upon heating, as by a resistance heater, the second material changes the optical pathlength by an amount predominantly determined by |dn2/dT| providing faster switching speed. In a preferred embodiment, the core comprises silica, and the second material comprises silicon to produce switching speeds up to a few hundred MHz.

REFERENCES:
patent: 6122416 (2000-09-01), Ooba et al.
patent: 6310999 (2001-10-01), Marcuse et al.
patent: 6535672 (2003-03-01), Paiam
patent: 6643419 (2003-11-01), Chang et al.
patent: 6704487 (2004-03-01), Parhami et al.
patent: 6751396 (2004-06-01), Erben
patent: 2002/0146226 (2002-10-01), Davis et al.

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