Managing data flow in VCSEL-based optical communications system

Patent metadata

Field	Value
Publication number	US-10447389-B2
Application number	US-201715686304-A
Country	US
Kind code	B2
Filing date	Aug 25, 2017
Priority date	Aug 25, 2017
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

Methods according to the disclosure include methods for managing data flow in an optical communications system having a plurality of vertical cavity surface emitting lasers (VCSELs). The method generally includes determining whether operation of the system exceeds a thermal threshold for a thermal parameter of the system, and switching from a first data bandwidth to a second data bandwidth when the thermal threshold is exceeded. Operation at the second data bandwidth further includes determining whether further operation of the system demands the first data bandwidth, and resuming operation of the system at the first data bandwidth only when the thermal parameter during operation at the second data bandwidth does not exceed the thermal threshold.

First claim

What is claimed is:

1. A method for managing data flow in an optical communications system having a plurality of vertical cavity surface emitting lasers (VCSELs), the method comprising: determining, during operation of the optical communications system at a first data bandwidth, whether a thermal parameter of the optical communications system violates a thermal threshold; and in response to the thermal parameter of the optical communications system violating the thermal threshold, operating the optical communications system at a second data bandwidth, wherein the operating of the optical communications system at the second data bandwidth further includes: determining whether the second data bandwidth meets a bandwidth demand on the optical communications system, in response to the second data bandwidth meeting the bandwidth demand, continuing the operating of the optical communications system at the second data bandwidth, in response to the second data bandwidth not meeting the bandwidth demand, determining, during operation of the optical communications system at the second data bandwidth, whether the thermal parameter of the optical communications system violates the thermal threshold, and resuming the operating of the optical communications system at the first data bandwidth if the thermal parameter of the optical communications system does not violate the thermal threshold, in response to the thermal parameter of the optical communications system violating the thermal threshold, determining whether the second data bandwidth violates a minimum bandwidth for the optical communications system, in response to the second data bandwidth exceeding the minimum bandwidth for the optical communications system, reducing the second data bandwidth before continuing the operating of the optical communications system at the second data bandwidth, and in response to the second data bandwidth not exceeding the minimum bandwidth for the optical communications system, issuing a warning responsive to the minimum bandwidth of the optical communications system is not exceeded.

2. The method of claim 1 , wherein operating the optical communications system at the first data bandwidth further includes: in response to the thermal parameter of the optical communications system not violating the thermal threshold during operation at the first data bandwidth, determining whether operation at the second data bandwidth meets the bandwidth demand on the optical communications system; in response to determining that the second data bandwidth does not meet the bandwidth demand on the optical communications system, continuing the operating of the optical communications system at the first data bandwidth; and in response to determining that the second data bandwidth meets the bandwidth demand on the optical communications system, operating of the optical communications system at the second data bandwidth.

3. The method of claim 1 , wherein operating the optical communications system at the first data bandwidth further includes: in response to the thermal parameter of the optical communications system violating the thermal threshold, reducing the second data bandwidth before continuing the operating of the optical communications system at the second data bandwidth.

4. The method of claim 1 , wherein determining whether the thermal parameter of the optical communications system violates the thermal threshold includes comparing at least one measured temperature of the optical communications system with the thermal threshold.

5. The method of claim 1 , wherein determining whether the thermal parameter of the optical communications system violates the thermal threshold includes comparing a representative temperature from a model of the optical communications system with the thermal threshold.

6. The method of claim 1 , wherein the optical communications system includes at least one transmitter VCSEL and at least one receiver, and wherein operating the optical communications system at the first data bandwidth and the second data bandwidth simultaneously affects a data flow rate of the at least one transmitter VCSEL and a data flow rate of the at least one receiver.

7. The method of claim 1 , further comprising, in response to the thermal parameter of the optical communications system violating the thermal threshold during operation at the second data bandwidth, performing actions including issuing a warning if the thermal threshold of the optical communications system is violated, wherein issuing the warning to indicate the thermal threshold of the optical communications system is violated includes shutting down the optical communications system.

8. A computer program product stored on a non-transitory computer readable medium, the computer program product comprising program code, which, when being executed by at least one computing device, causes the at least one computing device to: determine, during operation of the optical communications system at a first data bandwidth, whether a thermal parameter of the optical communications system violates a thermal threshold; and in response to the thermal parameter of the optical communications system violating the thermal threshold, operate the optical communications system at a second data bandwidth, wherein the operation of the optical communications system at the second data bandwidth further includes: determining whether the second data bandwidth meets a bandwidth demand on the optical communications system, in response to the second data bandwidth meeting the bandwidth demand, continuing the operating of the optical communications system at the second data bandwidth, in response to the second data bandwidth not meeting the bandwidth demand, determining, during operation of the optical communications system at the second data bandwidth, whether the thermal parameter of the optical communications system violates the thermal threshold, and resuming the operating of the optical communications system at the first data bandwidth if the thermal parameter of the optical communications system does not violate the thermal threshold, in response to the thermal parameter of the optical communications system violating the thermal threshold, determining whether the second data bandwidth exceeds a minimum bandwidth for the optical communications system, in response to the second data bandwidth exceeding the minimum bandwidth for the optical communications system, reducing the second data bandwidth before continuing the operating of the optical communications system at the second data bandwidth, and in response to the second data bandwidth not exceeding the minimum bandwidth for the optical communications system, issuing a warning to indicate the minimum bandwidth of the optical communications system is not exceeded.

9. The computer program product of claim 8 , wherein operating the optical communications system at the first data bandwidth further causes the at least one computing device to: in response to the thermal parameter of the optical communications system not violating the thermal threshold during operation at the second data bandwidth, determine whether operation at the second data bandwidth meets the bandwidth demand on the optical communications system; in response to determining that the second data bandwidth does not meet the bandwidth demand on the optical communications system, continue the operating of the optical communications system at the first data bandwidth; and in response to determining that the second data bandwidth meets the bandwidth demand on the optical communications system, operate the optical communications system at the second data bandwidth.

10. The computer program product of claim 8 , wherein operating the optical com

Assignees

• Globalfoundries Inc
• IBM

Inventors

• Cranford Jr Hayden C
• Proesel Jonathan E
• Bindu Rashmi R

Classifications

• H04B10/0795

  Performance monitoring; Measurement of transmission parameters · CPC title

• H04L47/24 Primary

  Traffic characterised by specific attributes, e.g. priority or QoS · CPC title

• H04L47/29

  using a combination of thresholds · CPC title

• H04Q2011/0084

  Quality of service aspects · CPC title

• H04B10/503 Primary

  Laser transmitters · CPC title