Optical-electrical device using hybrid automated testing equipment

Patent metadata

Field	Value
Publication number	US-11243550-B2
Application number	US-202016887668-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	May 29, 2020
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

An optical-electrical device can implement a feedback-based control loop for temperature of the device during component calibration. The optical-electrical device can implement compressed air to vary the device temperature during calibration. Additionally, non-active components of the device can be provided current to vary the temperature of the device in concert with the provided compressed air. Additional calibration temperatures can be implemented by activating and deactivating additional non-active components in the device, such as light sources, optical amplifiers, and modulators.

First claim

What is claimed is:

1. A method for calibrating optical components in a photonic integrated circuit (PIC), the method comprising:
activating one or more active optical components in the PIC of an optical-electrical circuit structure, the optical-electrical circuit structure comprising the PIC and one or more electrical circuits external to the PIC, the one or more electrical circuits including a processor circuit configured to generate a temperature control signal that adjusts an electrically controlled pressured air source that is configured to direct a high pressure airflow towards the PIC;
generating an initial temperature value using an integrated temperature sensor that is integrated in the optical-electrical circuit structure, the integrated temperature sensor being positioned proximate to the active optical components such that the integrated temperature sensor receives heat generated by the active optical components in the PIC, the initial temperature value indicating that the PIC is at an initial temperature after activation of the one or more active optical components in the PIC, the initial temperature corresponding to a preconfigured calibration temperature utilized to calibrate the PIC;
receiving calibration adjustments to the one or more active optical components of the PIC while the initial temperature value generated by the integrated temperature sensor indicates the PIC is at the initial temperature;
detecting, by the processor circuit, varying temperature values generated by the integrated temperature sensor; and
in response to the varying temperature values, adjusting, using the processor circuit, the temperature control signal to cause the electrically controlled pressured air source to vary a strength of the high pressure airflow directed towards the PIC such that a temperature of the PIC is adjusted closer to the initial temperature due to the high pressure airflow passing over the PIC while the one or more active optical components are calibrated.

2. The method of claim 1 , wherein the temperature control signal is continually adjusted to cause the electrically controlled pressured air source to vary a strength of the high pressure airflow, and wherein the high pressure airflow is directed to the PIC using a directional channel that is near the PIC.

3. The method of claim 2 , wherein the directional channel does not touch the PIC while directing the high pressure airflow towards the PIC.

4. The method of claim 1 , wherein the electrically controlled pressured air source is an air compressor with an electrically controllable valve.

5. The method of claim 1 , wherein the processor circuit is electrically connected to the PIC to receive temperature vales from the integrated temperature sensor.

6. The method of claim 1 , wherein the one or more electrical circuits external to the PIC are connected to the PIC using one or more electrical contacts.

7. The method of claim 6 , wherein the one or more electrical contacts comprise metal contacts on the PIC.

8. The method of claim 1 , wherein the PIC comprises additional active optical components that operate independently of the one or more active optical components.

9. The method of claim 8 , wherein the PIC is an optical transceiver comprising an optical transmitter and an optical receiver, wherein the one or more active optical components are optical transmitter components of the optical transmitter, and wherein the additional active optical components are optical receiver components of the optical receiver.

10. The method of claim 8 , wherein the PIC is a multi-lane optical transmitter, wherein the one or more active optical components are components of one lane of the multi-lane optical transmitter, and wherein the additional active optical components are other optical components in other lanes of the multi-lane optical transmitter.

11. The method of claim 8 , wherein the PIC is a multi-lane optical receiver, wherein the one or more active optical components are components of one lane of the multi-lane optical receiver, and wherein the additional active optical components are other optical components in other lanes of the multi-lane optical receiver.

12. The method of claim 8 , wherein the one or more active optical components are components for calibration at the initial temperature corresponding to a preconfigured calibration temperature, wherein the additional active optical components are current-receiving components of the PIC not receiving calibration adjustments at the initial temperature that corresponds to the preconfigured calibration temperature.

13. The method of claim 8 , further comprising:
activating the additional active optical components to increase heat in the PIC;
generating an elevated temperature value using the integrated temperature sensor, the elevated temperature value corresponding to an elevated preconfigured calibration temperature that is higher than the preconfigured calibration temperature;
receiving calibration adjustments while the PIC is at the elevated preconfigured calibration temperature;
detecting, by the processor circuit, additional varying temperature values generated by the integrated temperature sensor; and
in response to the additional varying temperature values, continually adjusting the temperature control signal to cause the electrically controlled pressured air source to vary the strength of the high pressure airflow directed toward the PIC such that the temperature of the PIC is adjusted close to the elevated preconfigured calibration temperature.

14. The method of claim 1 , wherein the one or more active optical components are activated at least in part by supplying electrical current to the one or more active optical components.

15. The method of claim 14 , wherein the one or more active optical components include one or more of: a light source, an optical amplifier, an electro-absorption modulator (EAM), a phase-based coupler, a photodetector.

16. An optical-electrical structure comprising:
a photonic integrated circuit (PIC) comprising one or more active optical components that receive current to set the PIC at an initial temperature, the one or more active optical components receiving calibration adjustments while the PIC is set to the initial temperature;
an integrated temperature sensor that is positioned proximate to the active optical components such that the integrated temperature sensor receives heat generated by the active optical components in the PIC, the integrated temperature sensor to generate an initial temperature value in response to the one or more active optical components receiving current; and
one or more electrical circuits external to the PIC, the one or more electrical circuits including a processor circuit configured to generate a temperature control signal that adjusts an electrically controlled pressured air source that is configured to direct a high pressure airflow towards the PIC, the processor circuit configured to, in response detecting varying temperature values generated by the integrated temperature sensor, adjust the temperature control signal to cause the electrically controlled pressured air source to vary a strength of the high pressure airflow directed towards the PIC such that a temperature of the PIC is adjusted closer to the initial temperature due to the high pressure airflow on the PIC while the one or more active optical components receive calibration adjustments.

17. The optical-electrical structure of claim 16 , wherein the temperature control signal is continually adjusted to cause the electrically controlled

Assignees

• Juniper Networks Inc

Inventors

• Barnard Chris
• Keck Steven William
• Mapagay Crispin Cruz
• Sosnowski George R
• Stenholm Mark

Classifications

• G02B6/4266 Primary

  Thermal aspects, temperature control or temperature monitoring (thermal aspect of electrical circuits H05K7/20, H05K5/0213, temperature control in general G05D23/19) · CPC title

• G01K13/00

  Thermometers specially adapted for specific purposes · CPC title

• H04B10/0799 Primary

  Monitoring line transmitter or line receiver equipment · CPC title

• G02B6/02176

  due to temperature fluctuations · CPC title

• H04B10/40

  Transceivers · CPC title