IP Library › Granted Patent US 6,870,977
Granted Patent B2
US 6,870,977 · App. 10/074,023 · Granted Mar 22, 2005

Monolithic integrated optical component including a modulator and a heterojunction bipolar transistor

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Quick Facts
Patent No.
US 6,870,977
App. No.
10/074,023
Filed
Feb 14, 2002
Granted
Mar 22, 2005
Kind
B2
Art Unit
2874
USPC
385/14
Abstract

A monolithic integrated optical component includes a control transistor connected to an electro-optical component including an active waveguide and at least one input waveguide and one output waveguide. The transistor is a heterojunction bipolar transistor including at least one sub-collector layer that is common to a confinement layer of the electro-optical component. The active waveguide of the electro-optical component includes a widened structure under a contact area of the heterojunction bipolar transistor and having substantially the same surface area as the transistor.

Claims (8)

1. A monolithic integrated optical component including a control transistor connected to an electro-optical component including an active waveguide and at least one input waveguide and one output waveguide, in which component said transistor is a heterojunction bipolar transistor including at least one sub-collector layer that is common to a confinement layer of said electro-optical component, and said active waveguide of said electro-optical component includes a widened structure under a contact area of said heterojunction bipolar transistor and having substantially the same surface area as said transistor.

2. The optical component claimed in claim 1 wherein said widened structure of said active waveguide is lengthened in such a manner as to constitute a multimode interference coupler.

3. The optical component claimed in claim 2 wherein said multimode interference coupler has one input waveguide and one output waveguide.

4. The optical component claimed in claim 2 wherein said multimode interference coupler has N input waveguides and N output waveguides.

5. The optical component claimed in claim 1 wherein said electro-optical component is a modulator.

6. The optical component claimed in claim 1 wherein said electro-optical component is a laser source.

7. The optical component claimed in claim 1 wherein said electro-optical component is a photodiode.

8. The optical component claimed in claim 1 wherein said electro-optical component is a semiconductor optical amplifier.