Methods and apparatuses for maximizing output modulation amplitude for optical wavelength division multiplexed micro-ring modulators

Patent metadata

Field	Value
Publication number	US-12425107-B2
Application number	US-202318202512-A
Country	US
Kind code	B2
Filing date	May 26, 2023
Priority date	May 26, 2023
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

Some examples described herein provide for controlling output modulation amplitude for optoelectronic devices. In an example, a method includes transmitting a first data pattern to an optical modulator device. The method also includes determining, while transmitting the first data pattern and for each heater control value of a plurality of heater control values for a heater, a photodiode current value associated with the optical modulator device to generate a plurality of photodiode current values corresponding to the plurality of heater control values. The method also includes determining a maximum optical modulation amplitude for the optical modulator device based at least in part on the plurality of photodiode current values corresponding to the plurality of heater control values. The method also includes controlling the heater for the optical modulator device based on the maximum optical modulation amplitude.

First claim

What is claimed is:

1. A method of operating an optoelectronic device, comprising:
transmitting a first data pattern to an optical modulator device of the optoelectronic device;
determining, while transmitting the first data pattern and for each heater control value of a plurality of heater control values for a heater for the optical modulator device, a photodiode current value associated with the optical modulator device to generate a plurality of photodiode current values corresponding to the plurality of heater control values;
determining a maximum optical modulation amplitude for the optical modulator device based at least in part on the plurality of photodiode current values corresponding to the plurality of heater control values;
controlling the heater for the optical modulator device based at least in part on the maximum optical modulation amplitude determined for the optical modulator device; and
transmitting at least a second data pattern to the optical modulator device.

2. The method of claim 1 , wherein the maximum optical modulation amplitude is determined based at least in part on the first data pattern and at least the second data pattern.

3. The method of claim 1 , wherein the first data pattern comprises a series of consecutive “0” bits, a series of consecutive “1” bits, or a series of alternating “0” bits and “1” bits.

4. The method of claim 1 , further comprising:
identifying that a first heater control value associated with a first photodiode current value in a range of heater control values exceeds a threshold value; and
adjusting the range to determine the plurality of heater control values based at least in part on the range of the heater control values exceeding the threshold value.

5. The method of claim 1 , further comprising:
determining, for each optical modulator device of a plurality of optical modulator devices, a maximum optical modulation amplitude for the optical modulator device, each optical modulator device of the plurality of optical modulator devices associated with a corresponding heater of a plurality of heaters; and
controlling each heater of the plurality of heaters according to the maximum optical modulation amplitude determined for the optical modulator device corresponding to the heater.

6. The method of claim 1 , wherein controlling the heater for the optical modulator device based at least in part on the maximum optical modulation amplitude determined for the optical modulator device comprises:
tracking an output value for a photodiode associated with the optical modulator device; and
transmitting one or more heater control values to adjust a temperature of the heater, the one or more heater control values based at least in part on the tracked output value and the maximum optical modulation amplitude.

7. The method of claim 1 , wherein the optical modulator device comprises a silicon micro-ring modulator.

8. The method of claim 1 , wherein the heater is controlled by a digital signal processor.

9. A method of operating an optoelectronic device, comprising:
transmitting a plurality of data patterns to an optical modulator device of a plurality of optical modulator devices of the optoelectronic device;
determining a plurality of optical power values for the plurality of data patterns, each transmitter data pattern of the plurality of data patterns corresponding to one of the plurality of optical power values;
determining a maximum optical modulation amplitude for the optical modulator device based at least in part on the plurality of optical power values and based at least in part on the plurality of data patterns; and
controlling a heater for the optical modulator device based at least in part on the maximum optical modulation amplitude determined for the optical modulator device.

10. The method of claim 9 , further comprising:
determining, while transmitting a first data pattern of the plurality of data patterns, and for each heater control value of a plurality of heater control values for the heater, a photodiode current value associated with the optical modulator device to generate a plurality of photodiode current values corresponding to the plurality of heater control values,
wherein the optical power value for the first data pattern is determined based at least in part on the plurality of photodiode current values and the plurality of heater control values corresponding to the plurality of photodiode current values.

11. The method of claim 9 , wherein at least one of the plurality of data patterns comprises a series of consecutive “0” bits, a series of consecutive “1” bits, or a series of alternating “0” bits and “1” bits.

12. The method of claim 9 , further comprising:
identifying that a first heater control value associated with a first photodiode current value in a range of heater control values exceeds a threshold value; and
adjusting the range to determine the heater control values based at least in part on the range of the heater control values exceeding the threshold value.

13. The method of claim 9 , wherein controlling the heater for the optical modulator device based at least in part on the maximum optical modulation amplitude determined for the optical modulator device comprises:
tracking an output value for a photodiode associated with the optical modulator device; and
transmitting a heater control value to adjust a temperature of the heater, the heater control value based at least in part on the tracked output value and the maximum optical modulation amplitude.

14. The method of claim 9 , wherein the optical modulator device comprises a silicon micro-ring modulator.

15. The method of claim 9 , wherein the plurality of optical power values are determined by a digital signal processor.

16. An optoelectronic device, comprising:
an optical modulator device;
a heater thermally coupled with the optical modulator device;
a photodiode associated with the optical modulator device; and
control circuitry coupled with the heater and the photodiode, the control circuitry to:
transmit a first data pattern to the optical modulator device;
determine, while transmitting the first data pattern and for each heater control value of a plurality of heater control values for the heater, a photodiode current value for the photodiode to generate a plurality of photodiode current values corresponding to the plurality of heater control values;
determine a maximum optical modulation amplitude for the optical modulator device based at least in part on the plurality of photodiode current values corresponding to the plurality of heater control values;
control the heater based at least in part on the maximum optical modulation amplitude determined for the optical modulator device; and
transmit at least a second data pattern to the optical modulator device.

17. The optoelectronic device of claim 16 , further comprising:
a plurality of optical modulator devices coupled with the control circuitry; and
a plurality of heaters, each optical modulator device of the plurality of optical modulator devices associated with a corresponding heater of the plurality of heaters,
wherein the control circuitry is further to:
determine, for each optical modulator device of the plurality of optical modulator devices, a maximum optical modulation amplitude for the optical modulator device; and
control each heater of the plurality of heaters according to the maximum optical modulation amplitude determined for the optical modulator device corresponding to the heater.

18. The optoelectronic device

Assignees

• Xilinx Inc

Inventors

• Bekele Adebabay M
• Raj Mayank
• Xie Chuan
• Kumar Sandeep
• Wang Zhaowen
• Pattanagiri Giriyappa Sukruth
• Upadhyaya Parag
• Frans Yohan

Classifications

• H04B10/505

  using external modulation · CPC title

• H04B10/508

  Pulse generation, e.g. generation of solitons · CPC title

• H04B10/506

  Multiwavelength transmitters · CPC title

• H04B10/5051

  using a series, i.e. cascade, combination of modulators · CPC title

• H04B10/541 Primary

  Digital intensity or amplitude modulation · CPC title