Variable optical attenuator

Details Variable optical attenuator Variable optical attenuator

2007-05-29

2007-05-29

Wood, Kevin S. (Department: 2874)

Optical waveguides

Accessories

Attenuator

C385S040000

Reexamination Certificate

active

11141880

ABSTRACT:
An apparatus for attenuating a light signal is disclosed. The apparatus causes optical attenuation in a waveguide, where the waveguide has an input port for receiving a light signal and an output port for output of an attenuated light signal. First, an electric field is generated in at least a portion of the waveguide, such that a first refractive index in that portion of the waveguide is changed to a second refractive index. Next, the light signal in the waveguide is directed from the input port to the output port through the electric field. And lastly, the light signal is attenuated as a function of the electric field. The light signal may be attenuated, for example, by changing the deflection angle, changing the beam collimation width or from emitting part of the light signal from the waveguide before the light signal reaches the output port.

REFERENCES:
patent: 5966493 (1999-10-01), Wagoner et al.
patent: 6507681 (2003-01-01), Kowalczyk et al.
patent: 2001/0046363 (2001-11-01), Purchase et al.

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