Methods and apparatus for pre-programming layer-0 service turn up speeds for photonic service provisioning or restoration

• US 10,050,737 B1
• Filed: 05/04/2017
• Issued: 08/14/2018
• Est. Priority Date: 05/04/2017
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Al Sayeed, Choudhury A., Bownass, Dave C., Boertjes, David W., Atkinson, Dave, Richens, Dominic
• Primary Examiner(s): Bello, Agustin
• Application Number:
  US15/586,911
• Time in Patent Office: 467 Days
• Field of Search: 398 1- 9
• CPC Class Codes: H04B 10/03 Arrangements for fault recovery
• CPC Class Codes: H04B 10/032 using working and protection systems H04J14/0287 takes precedence
• CPC Class Codes: H04B 10/0793 Network aspects, e.g. central monitoring of transmission parameters
• CPC Class Codes: H04B 10/27 Arrangements for networking
• CPC Class Codes: H04J 14/021 Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/02218 Centralized control

Abstract

Pre-programming Layer-0 optical protection path restoration speeds is provided based on available path margin. Higher layer routers and switches can be made aware of the expected Layer-0 restoration time, and their switch time can be programmed accordingly. The proposed method can provide users an option to program a restoration speed for a specific photonic service on a per restoration path basis. The method can highlight which services will potentially be impacted by the selected restoration speed on that path. The user can proceed with the selected speed for restoring high priority layer-0 services even if that means the fast restoring event can potentially impact other low priority services already in-service on the restoration path.

Claims

1. A method of changing photonic service capacity along an optical transport path in an optical network, the method comprising:

determining first available margins of all existing first services actively provisioned along the optical transport path according to a then present optical loading condition along the optical transport path;

readjusting each first available margin by a first additional margin penalty each first active service would incur when the photonic service capacity would be changed along the optical transport path;

obtaining a path margin from the readjusted first available margins;

determining a maximum path allowable power offset from the path margin; and

obtaining photonic controller settings which would generate less than the maximum path allowable power offset for all first active services along the transport path during the photonic service capacity change.

2. A method as claimed in claim 1 wherein determining the first available margins of all first services actively provisioned along the transport path the method further comprises one of:

querying one of;

a photonic service provisioning database, a control plane, and an optical add drop multiplexer node controller along the transport path; and

determining first available margins from performance metrics from a first transponder associated with each first service.

3. A method as claimed in claim 1 wherein readjusting each first available margin the method further comprises one of:

performing a table lookup based on the first available margins to obtain the first additional penalty;

determining the first additional penalty from functional dependency of calibration data;

computing the first additional penalty based on an optical power perturbation model; and

obtaining the first additional penalty from a neural network executing coded logic instructions of a machine learning algorithm to train the neural network on the optical network as the optical network undergoes changes in spectral loading on an ongoing basis.

4. A method as claimed in claim 1 wherein obtaining the path margin comprises selecting a minimum readjusted first available margin from all readjusted first available margins of all existing first services actively provisioned along the transport path.

5. A method as claimed in claim 1 wherein determining a maximum path allowable power offset the method comprises obtaining the maximum allowable power offset from one of:

planned data points from SNR variations due to channel power changes and current system operating conditions.

6. A method as claimed in claim 1 further comprising saving at least one photonic service capacity change controller setting for adding capacity along the transport path for one of:

a new photonic service to be provisioned along the transport path,

a faulted photonic service that would use the transport path as a protection path,

a group of second photonic services that would use the transport path as a protection path as triggered by the faulted photonic service and

a group of third co-routed photonic services that would use the transport path as a protection path as triggered by the faulted photonic service.

7. A method as claimed in claim 6 further comprising prior steps of:

detecting at least one of an optical network fault and the faulted photonic service; and

obtaining a faulted photonic service path.

8. A method as claimed in claim 7, wherein using the transport path to restore the faulted photonic service provisioned along the faulted photonic service path having remaining operational optical sections, for each optical section remaining in-service the method further comprising:

determining second available margins of all existing second services actively provisioned along the optical section according to a then present optical loading condition along the faulted optical transport path;

readjusting each second available margin by a second additional margin penalty each second active service would incur when the faulted photonic service would be removed from the optical section;

obtaining an optical section margin from the readjusted second available margins;

determining a maximum optical section allowable power offset from the optical section margin; and

obtaining photonic controller settings which would generate less than the maximum optical section allowable power offset for all second active services on the optical section.

9. A method as claimed in claim 8 wherein determining the second available margins of all second services actively provisioned along each remaining optical section the method further comprises one of:

querying one of;

a photonic service provisioning database, a control plane and an optical add drop multiplexer node controller along the faulted photonic service path; and

determining second available margins from performance metrics from a second transponder associated with each second service.

10. A method as claimed in claim 8 wherein readjusting each second available margin the method further comprises one of:

performing a table lookup based on the second available margins to obtain the second additional penalty;

determining the second additional penalty from functional dependency of calibration data;

computing the second additional penalty based on an optical power perturbation model; and

obtaining the second additional penalty from a neural network executing coded logic instructions of a machine learning algorithm to train the neural network on the optical network as the optical network undergoes changes in spectral loading on an ongoing basis.

11. A method as claimed in claim 8 wherein obtaining the optical section margin comprises selecting a minimum readjusted second available margin from all readjusted second available margins of all existing second services actively provisioned along the faulted photonic service path.

12. A method as claimed in claim 8 wherein determining a maximum path allowable power offset the method comprises obtaining the maximum allowable power offset from one of:

planed data points from SNR variations due to channel power changes and current system operating conditions.

13. A method as claimed in claim 8 further comprising saving at least one photonic service capacity delete controller setting for each optical section along the faulted photonic service path.

21. The method as claimed in claim 1, wherein changing the photonic service capacity along the optical transport path comprises changes one of a modulation format, a Baud rate, a line rate, a Forward Error Correction offset and launch power.

23. The method as claimed in claim 1, wherein obtaining photonic controller settings the method further comprises selecting photonic controller settings corresponding to one of a capacity change speed along the optical transport path and bandwidth capacity change along the optical transport path.

24. The method as claimed in claim 8, wherein obtaining photonic controller settings the method further comprises selecting photonic controller settings corresponding to one of a capacity change speed along the optical section remaining in-service and bandwidth capacity change along the optical section remaining in-service.

14. A control plane server for one of provisioning and monitoring photonic services in an optical network, for each photonic service capacity change the control plane server being configured to:

determine available margins of all existing services actively provisioned along an optical transport path according to a then present optical loading condition along the optical transport path;

readjust each available margin by an additional margin penalty each active service would incur when the photonic service capacity would be changed along the optical transport path;

obtain a path margin from the readjusted available margins;

determine a maximum path allowable power offset from the path margin; and

obtain photonic controller settings which would generate less than the maximum path allowable power offset for all active services along the transport path during the photonic service capacity change.

15. A control plane server as claimed in claim 14 wherein the optical network is one of an optical mesh network and an optical ring network.

16. A control plane server as claimed in claim 14 wherein being configured to determine the available margins of all services actively provisioned along the transport path the control server is further configured perform one of:

query one of;

a photonic service provisioning database, a control plane, and an optical add drop multiplexer node controller along the transport path; and

determine first available margins from performance metrics from a transponder associated with each service.

17. A control plane server as claimed in claim 14 wherein being configured to readjust each available margin the control server further comprises a processor configured to:

perform a table lookup based on the available margins to obtain the additional penalty;

determine the additional penalty from functional dependency of calibration data;

compute the additional penalty based on an optical power perturbation model; and

obtaining the additional penalty from a neural network executing coded logic instructions of a machine learning algorithm to train the neural network on the optical network as the optical network undergoes changes in spectral loading on an ongoing basis.

18. A control plane server as claimed in claim 14 wherein being configured to obtain the path margin from the readjusted available margins the control server further comprises a selector configured to select a minimum readjusted available margin from all readjusted available margins of all existing services actively provisioned along the transport path.

19. A control plane server as claimed in claim 14 wherein determining a maximum path allowable power offset the server being further configured to obtain the maximum allowable power offset from one of:

planed data points from SNR variations due to channel power changes and current system operating conditions.

20. A control plane server as claimed in claim 14 further being configured to save at least one photonic service capacity change controller setting for one of:

the transport path providing one of;

a new photonic service to be provisioned along the transport path,

a faulted photonic service to be restored along the transport path,

a group of second photonic services that would use the transport path as a protection path and

a group of third co-routed photonic services that would use the transport path as a protection path; and

each optical section along a faulted photonic service path following detection of a photonic service fault along the faulted photonic service path.

22. The control plane server as claimed in claim 14, wherein changing the photonic service capacity the control plane server is further configured to change one of a modulation format, a Baud rate, a line rate, a Forward Error Correction offset and launch power.

25. The control plane server as claimed in claim 14, wherein obtaining photonic controller settings the control plane server is further configured to selecting photonic controller settings corresponding to one of a capacity change speed and bandwidth capacity change.