REDUNDANT RING RESONATORS OF VARYING DIMENSIONS TO REDUCE RING RESONATOR TUNING REQUIREMENTS

• US 20120057866A1
• Filed: 01/27/2009
• Published: 03/08/2012
• Est. Priority Date: 01/27/2009
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: McLaren, Moray, Jouppi, Norman Paul
• Granted Patent: US 8,660,390 B2
• Time in Patent Office: Days
• US Class Current: 398/25
• CPC Class Codes: G02B 6/12007 forming wavelength selective elements, e.g. multiplexer, demultiplexer
• CPC Class Codes: G02B 6/29343 Cascade of loop resonators
• CPC Class Codes: G02B 6/29395 configurable, e.g. tunable or reconfigurable switching G02B6/35

Abstract

Various embodiments of the present invention relate to systems for reducing the amount of power consumed in temperature tuning resonator-based transmitters and receivers. In one aspect, a system comprises an array of resonators (801-806) disposed adjacent to a waveguide (646) and a heating element (808). The heating element is operated to thermally tune the array of resonators so that each resonator in a subset of the array of resonators is in resonance with a wavelength of light traveling in the waveguide.

Claims

1. A system comprising:

an array of resonators (801-806) disposed adjacent to a waveguide (646), each resonator having a different resonance wavelength, and the array of resonators including at least one redundant resonator; and

a heating element (808) disposed adjacent to the array of resonators and operated to control the temperature of the resonators so that each resonator in a subset of the array of resonators is in resonance with a different wavelength of light traveling in the waveguide.

2. The system of claim 1 further comprising:

at least one temperature detector (811,812) disposed in proximity to the array of resonators; and

a temperature control (810) in electronic communication with the heating element and the at least one temperature detector, wherein the temperature control monitors the temperature of the array of resonators via the at least one temperature detector and operates the heating element to control the temperature of the resonators.

3. The system of claim 2 wherein the temperature control operates the heating element to control the temperature of the array of resonators further comprises application of an amount of heat that shifts the resonance wavelength of the resonators so that a second subset of the array of resonators is in resonance with the wavelengths of light traveling in the waveguide when a resonance temperature cannot be maintained.

4. The system of claim 2 wherein the temperature control operates the heating element to control the temperature of the array of resonators further comprises application of an amount of heat to maintain the resonance wavelengths of the array of resonators when a resonance temperature can be maintained.

5. The system of claim 1 wherein each resonator in the array of resonators further comprises a p-i-n junction that can be electronically tuned to modulate the amplitude of a resonant wavelength of light traveling in the waveguide.

6. The system of claim 1 wherein each resonator in the array of resonators further comprises a detector region that converts an optical signal circulating in a resonator into an electrical signal.

7. The system of claim 1 wherein the array of resonators further comprises ring resonators (102) configured so that each resonator has a different path length.

8. The system of claim 1 wherein the array of resonators further comprise resonance wavelength spacing approximately matching the wavelength spacing of the wavelengths of light traveling in the waveguide or is a fraction of the wavelength spacing of the wavelengths of light traveling in the waveguide.

9. The system of claim 1 wherein heating element further comprises an electronically resistive layer configured to deliver about the same amount of heat to each of the resonators in the array of resonators.

10. The system of claim 1 wherein at least one temperature detector further comprises a semiconductor diode-based thermometer or a semiconductor transistor-based thermometer.

11. A transmitter (602) comprising a system configured in accordance with claim 1 to encode information generated by an electronic device in modulated wavelengths of light traveling a waveguide.

12. A receiver (604) comprising a system configured in accordance with claim 1 to convert optical signals traveling in a waveguide into electrical signals.

13. A method for thermally tuning an array of resonators comprising:

monitoring the temperature (1301) of the array of resonators, each resonator having a different resonance wavelength;

applying a first amount of heat (1303) to the array of resonators so that each resonator in a first subset of the array of resonators is in resonance with a wavelength of light travelling in a waveguide adjacent to the array of resonators, when a resonance temperature can be maintained within a first tunable temperature range; and

applying a second amount of heat (1307) that shifts the resonance wavelengths of the array of resonators so that each resonator in a second subset of the array of resonators is in resonance with the wavelengths of light traveling in the waveguide, when the resonance temperature can be maintained within a second tunable temperature range.

14. The method of claim 13 further comprising pausing communication (1304) with the array of resonators while applying the second amount of heat.

15. The method of claim 13 further comprises:

adjusting multiplexers to receive data using the second subset of the array of resonators (1306) when the array of resonators are employed in a detector array (604);

or

adjusting multiplexers to transmit data using the second subset of the array of resonators (1306) when the array of resonators are employed in a transmitter array (602).