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US 2009/0290831 A1Published application
Junction Field Effect Transistor Geometry for Optical Modulators
AssigneeInternational Business Machines Corporation
InventorsWilliam Michael John Green, Yurii A. Vlasov
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Abstract
An optoelectronic apparatus for controlling a signal includes an optical waveguide having a variable refractive index; an active device formed within the waveguide, the device having three electrodes, a drain, a source and a gate; and wherein the device is located within the waveguide so that current flowing from the drain to the source changes the refractive index.
Claims17
An optoelectronic apparatus comprising:
- an optical waveguide having a variable refractive index;
- an active device formed within the waveguide, the device having three electrodes, a drain, a source and a gate;
- and
- wherein the device is located within the waveguide so that current flowing from the drain to the source changes the refractive index.
1 more element
A method of phase shifting a light signal, the method comprising:
- receiving a light signal;
- dividing the light signal into first and second signals through waveguide branches using an optical power splitter;
- the first signal traveling through a passive waveguide and the second signal traveling through an active phase shifter waveguide which incorporates an active device comprising a gate, a drain, and a source;
- controlling a relative phase between the active and passive branches by applying a voltage at the gate of the active device to phase shift the light signal.
1 more element
Dependencies are inferred from the claim text.