Systems and methods for a preemptive controller for photonic line systems

• US 9,985,726 B1
• Filed: 11/29/2016
• Issued: 05/29/2018
• Est. Priority Date: 11/29/2016
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Al Sayeed, Choudhury A., Bownass, Dave C., Kohlert, Scott
• Primary Examiner(s): Tran, Dzung
• Application Number:
  US15/363,385
• Publication Number:
  US 20180152241A1
• Time in Patent Office: 546 Days
• CPC Class Codes: H04B 10/0791 Fault location on the transmission path
• CPC Class Codes: H04J 14/021 Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]

Abstract

Systems and methods for an optical controller in an optical network for photonic control include monitoring signal output of the optical controller for fluctuations on a signal, wherein the optical controller may operate with one or more upstream optical controllers in the optical network which may cause the fluctuations; and initiating a control loop by the optical controller on the signal based on the monitored fluctuations. The initiating is based on one or more thresholds used to differentiate actions of the one or more upstream optical controllers of the plurality of optical controllers from one or more of fiber faults, natural fluctuations in fiber plant, and natural fluctuations in hardware.

Claims

1. A method implemented by an optical controller in an optical network for photonic control, the method comprising:

monitoring signal output of the optical controller for fluctuations on a signal, wherein the optical controller may operate with one or more upstream optical controllers in the optical network which may cause the fluctuations; and

initiating a control loop by the optical controller on the signal based on the monitored fluctuations,

wherein the monitoring and the initiating are based on a plurality of thresholds comprising

a Monitor Start Threshold (MST) used to start the monitoring,

a Perturbation Acceptance Threshold (PAT) used to determine the initiating where the PAT is indicative of an ability to converge despite the fluctuations in the signal, and

a Controller Convergence Threshold (CCT) used to declare convergence of the control loop.

2. The method of claim 1, wherein the fluctuations are based on one or more of fiber faults, natural fluctuations in fiber plant, natural fluctuations in hardware, and due to actions of the one or more upstream optical controllers.

3. The method of claim 1, wherein the initiating is based on one or more thresholds used to differentiate actions of the one or more upstream optical controllers from one or more of fiber faults, natural fluctuations in fiber plant, and natural fluctuations in hardware.

4. The method of claim 1, wherein CCT≤

PAT and PAT≤

MST.

5. The method of claim 1, wherein the CCT is adjusted by the optical controller dynamically based on measurements when the fluctuations are less than or equal to the PAT but greater than the CCT.

6. The method of claim 1, wherein the initiating occurs when the fluctuations are less than the PAT, and wherein the control loop is stopped when the fluctuations exceed the PAT.

7. The method of claim 1, wherein the optical controller and the one or more upstream optical controllers operate independently of one another without messaging for coordination.

8. The method of claim 1, further comprising:

subsequent to the initiating, performing a subsequent monitoring of the fluctuations after a first control cycle of the control loop; and

one of continuing the control loop based on the subsequent check and delaying the control loop based on the fluctuations in the subsequent monitoring.

9. The method of claim 8, wherein the subsequent monitoring is performed for a random period of time determined by control cycles of the optical controller.

10. The method of claim 1, wherein the monitoring detects an increase of the fluctuations over time, and the initiating waits for a period of time while the fluctuations settle down.

11. An optical controller adapted to perform photonic control in an optical network, the optical controller comprising:

a processor;

a communications interface communicatively coupled to the processor; and

memory storing instructions that, when executed, cause the processor to

monitor signal output of the optical controller for fluctuations on a signal, wherein the optical controller operates with one or more upstream optical controllers in the optical network which may cause the fluctuations, and

initiate a control loop by the optical controller on the signal based on the monitored fluctuations,

wherein the signal output is monitored and the control loop is initiated based on a plurality of thresholds comprising

a Monitor Start Threshold (MST) used to start the monitor,

a Perturbation Acceptance Threshold (PAT) used to initiate the control loop where the PAT is indicative of an ability to converge despite the fluctuations in the signal, and

a Controller Convergence Threshold (CCT) used to declare convergence of the control loop.

12. The optical controller of claim 11, wherein the fluctuations are based on one or more of fiber faults, natural fluctuations in fiber plant, natural fluctuations in hardware, and due to actions of the one or more upstream optical controllers of the plurality of optical controllers.

13. The optical controller of claim 11, wherein the control loop is initiated based on one or more thresholds used to differentiate actions of the one or more upstream optical controllers from one or more of fiber faults, natural fluctuations in fiber plant, and natural fluctuations in hardware.

14. The optical controller of claim 11, wherein the CCT is adjusted by the optical controller dynamically based on measurements when the fluctuations are less than or equal to the PAT but greater than the CCT.

15. The optical controller of claim 11, wherein the control loop is initiated when the fluctuations are less than the PAT, and wherein the control loop is stopped when the fluctuations exceed the PAT.

16. The optical controller of claim 11, wherein the memory storing instructions that, when executed, further cause the processor to

subsequent to the control loop being initiated, perform a subsequent monitor of the fluctuations after a first control cycle of the control loop, and

one of continue the control loop based on the subsequent monitor and delay the control loop based on the fluctuations in the subsequent check.

17. An optical network, comprising:

a plurality of interconnected Optical Add/Drop Multiplexer (OADM) nodes;

a plurality of links interconnecting the OADM nodes; and

a plurality of optical controllers configured to perform photonic control, wherein each of the plurality of optical controllers are adapted to

monitor signal output of an associated optical controller for fluctuations on a signal, and

initiate a control loop by the associated optical controller on the signal based on the monitored fluctuations,

wherein the signal output is monitored and the control loop is initiated based on a plurality of thresholds comprising

a Monitor Start Threshold (MST) used to start the monitor,

a Perturbation Acceptance Threshold (PAT) used to initiate the control loop where the PAT is indicative of an ability to converge despite the fluctuations in the signal, and

a Controller Convergence Threshold (CCT) used to declare convergence of the control loop.

18. The optical network of claim 17, wherein the control loop is initiated, at the associated optical controller, based on one or more thresholds used to differentiate actions of one or more upstream optical controllers of the plurality of optical controllers from one or more of fiber faults, natural fluctuations in fiber plant, and natural fluctuations in hardware.