Virtualized sections for sectional control of optical links

1. A non-transitory computer-readable storage medium having computer readable code stored thereon for programming a device to perform steps of:

obtaining and storing a first power spectral density snapshot of an optical link, from an optical spectrum monitor and when the optical link is in a non-fault condition;

responsive to detection of a fault on at least one channel traversing the optical link based on a received notification, obtaining a second power spectral density snapshot at a receiving end of the optical link;

analyzing the first power spectral density snapshot and the second power spectral density snapshot via cross-correlation: and

determining the fault is on the optical link based on the analyzing;

wherein the optical link is a foreign-controlled link.

2. The non-transitory computer-readable storage medium of claim 1 , wherein the computer readable code further programs the device to perform steps of

causing an alarm to be raised based on the determined fault.

3. The non-transitory computer-readable storage medium of claim 1 , wherein the analyzing measures a power difference between the first power spectral density snapshot and the second power spectral density snapshot, and the determining is based on the power difference being above a threshold.

4. The non-transitory computer-readable storage medium of claim 1 , wherein the first power spectral density snapshot is obtained from each edge node of the optical link.

5. The non-transitory computer-readable storage medium of claim 1 , wherein the received notification is from a shelf processor that has detected any of a Loss of Frame (LOF), a Loss of Signal (LOS), and a Loss of Clock (LOC) on the at least one channel.

6. The non-transitory computer-readable storage medium of claim 1 , wherein photonic components associated with the optical link have no in-band or out-of-band supervisory communication between the photonic components and edge nodes forming the optical link.

7. The non-transitory computer-readable storage medium of claim 1 , wherein the optical link is a submarine link.

8. An apparatus comprising:

a processor communicatively coupled to an optical spectrum monitor, wherein memory storing instructions that, when executed, cause the processor to

obtain and store a first power spectral density snapshot of an optical link, from the optical spectrum monitor and when the optical link is in a non-fault condition,

responsive to detection of a fault on at least one channel traversing the optical link based on a received notification, obtain a second power spectral density snapshot at a receiving end of the optical link,

analyze the first power spectral density snapshot and the second power spectral density snapshot via cross-correlation, and

determine the fault is on the optical link based on the analyze;

wherein the optical link is a foreign-controlled link.

9. The apparatus of claim 8 , wherein the instructions that, when executed, further cause the processor to

cause an alarm to be raised based on the determined fault.

10. The apparatus of claim 8 , wherein the first power spectral density snapshot and the second power spectral density snapshot are analyzed by a power difference measurement between the first power spectral density snapshot and the second power spectral density snapshot, and the fault is determined based on the power difference being above a threshold.

11. The apparatus of claim 8 , wherein the first power spectral density snapshot is obtained from each edge node of the optical link.

12. The apparatus of claim 8 , wherein the received notification is from a shelf processor that has detected any of a Loss of Frame (LOF), a Loss of Signal (LOS), and a Loss of Clock (LOC) detected on the at least one channel.

13. The apparatus of claim 8 , wherein photonic components associated with the optical link have no in-band or out-of-band supervisory communication between the photonic components and edge nodes forming the optical link.

14. The apparatus of claim 8 , wherein the optical link is a submarine link.

15. A method comprising:

obtaining and storing a first power spectral density snapshot of an optical link, from an optical spectrum monitor and when the optical link is in a non-fault condition;

responsive to detection of a fault on at least one channel traversing the optical link based on a received notification, obtaining a second power spectral density snapshot at a receiving end of the optical link;

analyzing the first power spectral density snapshot and the second power spectral density snapshot cross-correlation; and

determining the fault is on the optical link based on the analyzing;

wherein the optical link is a foreign-controlled link.

16. The method of claim 15 , further comprising

causing an alarm to be raised based on the determined fault.

17. The method of claim 15 , wherein the analyzing measures a power difference between the first power spectral density snapshot and the second power spectral density snapshot, and the determining is based on the power difference being above a threshold.

18. The method of claim 15 , wherein the first power spectral density snapshot is obtained from each edge node of the optical link.

19. The method of claim 15 , wherein the received notification is from a shelf processor that has detected any of a Loss of Frame (LOF), a Loss of Signal (LOS), and a Loss of Clock (LOC) detected on the at least one channel.

20. The method of claim 15 , wherein photonic components associated with the optical link have no in-band or out-of-band supervisory communication between the photonic components and edge nodes forming the optical link.