Dual-use electro-optic and thermo-optic modulator

Patent metadata

Field	Value
Publication number	US-10088697-B2
Application number	US-201514645568-A
Country	US
Kind code	B2
Filing date	Mar 12, 2015
Priority date	Mar 12, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A dual-use thermal and electro-optic modulator. A thermal adjustment hardware set and an electric-field adjustment hardware set adjust the thermal and electrostatic properties of a common waveguide area. The hardware sets are electrically coupled. Signals for each type of modulation are conducted to the waveguide through a shared portion of a communication medium.

First claim

What is claimed is:

1. A device comprising:
a waveguide, the waveguide being configured to communicate light;
a first heater and a second heater, the first heater and the second heater being configured to heat at least a first portion of the waveguide in a controlled manner, wherein the heating of at least the first portion of the waveguide results in thermo-optic phase shifting;
a radio frequency (RF) phase shifter incorporated into a ring modulator structure, wherein a first plurality of heater contact vertical interconnect accesses (VIAs) of the first heater are laterally positioned in parallel to a first plurality of RF contact VIAs of the RF phase shifter on a first wing and a second plurality of heater contact vertical interconnect accesses (VIAs) of the second heater are laterally positioned in parallel to a second plurality of RF contact VIAs of the RF phase shifter on a second wing surrounding the waveguide, and wherein the first and the second plurality of heater contact VIAs laterally positioned in parallel to the first and the second plurality of RF contact VIAs form a single structure that includes the first and the second heater and the RF phase shifter; and
thermal/electric-field communication medium material, wherein the thermal/electric-field communication medium material includes the first heater positioned below a first portion of the RF phase shifter on the first wing of the ring modulator structure and the second heater positioned below a second portion of the RF phase shifter on the second wing of the ring modulator structure, the thermal/electric-field communication medium material being configured to:
thermally communicate heating from the first heater to the first portion of the waveguide on the first wing and the second wing surrounding the first portion of the waveguide, through the plurality of heater contact VIAs on a shared portion of the thermal/electric-field communication medium material, and
communicate electric field adjustments from the RF phase shifter to the first portion of the waveguide on the first wing and the second wing surrounding the first portion of the waveguide, through the plurality of RF contact VIAs on the shared portion of the thermal/electric-field communication medium material;
wherein:
the first heater is electrically coupled to the RF phase shifter and the first heater and the RF phase shifter are independently controlled.

2. The device of claim 1 wherein the first portion of the waveguide and the thermal/electric-field communication medium material are formed as a physically integrated and unitary piece of a single material.

3. The device of claim 2 wherein the single material forming the first portion of the waveguide and the thermal/electric-field communication material is doped silicon.

4. The device of claim 1 wherein:
the first portion of the waveguide defines a central axis, an axial direction and a 360 degree range of radial directions; and
the thermal/electric-field communication medium extends from the first portion of the waveguide in at least a first radial direction.

5. The device of claim 4 wherein the thermal/electric-field communication medium extends from the first portion of the waveguide in at least a second radial direction.

6. The device of claim 5 wherein the first radial direction and the second radial direction are opposed about the central axis.

7. The device of claim 1 wherein:
the first portion of the waveguide defines a central axis, an axial direction and a 360 degree range of radial directions;
the first electric-field adjustment hardware set is spaced apart from the central axis in one, or more radial direction(s); and
the first heater is spaced apart from the central axis in one, or more, radial direction(s).

8. The device of claim 7 wherein:
the first heater is elongated in an elongation direction; and
the elongation direction is at least substantially parallel to the central axis.

9. The device of claim 1 wherein:
the first portion of the waveguide defines a central axis, an axial direction and a 360 degree range of radial directions; and
the central axis is at least substantially shaped as an arc of a circle.

10. The device of claim 1 , wherein the plurality of heater contact VIAs and the plurality of RF contact VIAs extend from a first end of the thermal/electric-field communication medium material to a second end of the thermal/electric-field communication medium material.

11. The device of claim 1 , wherein the plurality of heater contact VIAs and the plurality of RF contact VIAs extend in parallel to the waveguide from a first end of the thermal/electric-field communication medium material to a second end of the thermal/electric-field communication medium material.

12. A device comprising:
a waveguide, the waveguide being configured to communicate light;
a first heater and a second heater, the first heater and the second heater being configured to heat at least a first portion of the waveguide in a controlled manner; and
a radio frequency (RF) phase shifter incorporated into a ring modulator structure, wherein a plurality of heater contact vertical interconnect accesses (VIAs) of the first heater are positioned at a first end of thermal/electric-field communication medium material on a first wing, a plurality of heater contact vertical interconnect accesses (VIAs) of the second heater are positioned at the first end of thermal/electric-field communication medium material on a second wing, and a plurality of RF contact VIAs of the RF phase shifter at a second end of the of thermal/electric-field communication medium material, and wherein the plurality of heater contact VIAs, the plurality of RF contact VIAs, and the thermal/electric-field communication medium material form a single structure, and
wherein:
the thermal/electric-field communication medium material includes the first heater positioned above a first portion of the RF phase shifter on the first wing of the ring modulator structure and the second heater positioned above a second portion of the RF phase shifter on the second wing of the ring modulator structure, the thermal/electric-field communication medium material being configured to:
thermally communicate heating from the first heater to the first portion of the waveguide, through the plurality of heater contact VIAs on a shared portion of the thermal/electric-field communication medium material, and
communicate electric field adjustments from the RF phase shifter to the first portion of the waveguide, through the plurality of RF contact VIAs on the shared portion of the thermal/electric-field communication medium material.

13. The device of claim 12 , wherein the first heater is electrically coupled to the RF phase shifter and the first heater and the RF phase shifter are independently controlled.

14. The device of claim 13 , wherein the plurality of heater contact VIAs and the plurality of RF contact VIAs extend in parallel to the first portion of the waveguide.

Assignees

• IBM

Inventors

• Gill Douglas M
• Proesel Jonathan E
• Rosenberg Jessie C

Classifications

• G02F1/2257

  the optical waveguides being made of semiconducting material · CPC title

• G02F1/065

  in an optical waveguide structure · CPC title

• G02F1/025

  in an optical waveguide structure (G02F1/017, {G02F1/2257} take precedence) · CPC title

• G02F1/0147

  based on thermo-optic effects (G02F1/132 takes precedence) · CPC title

• G02F1/011 Primary

  in optical waveguides, not otherwise provided for in this subclass · CPC title