Control systems and methods for spectrally overlapped flexible grid spectrum using a control bandwidth

Patent metadata

Field	Value
Publication number	US-9768902-B2
Application number	US-201514920120-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Oct 22, 2015
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

Systems and methods to control optical signals in a spectrally overlapped, flexible grid spectrum system include receiving measured power within a control bandwidth for an optical signal, wherein the control bandwidth is less than a spectral occupancy of the optical signal and equal to or greater than a resolution bandwidth of a measurement device configured to measure the measured power; and controlling the optical signal based on the measured power and a target power within the control bandwidth. The optical signals can include Nyquist spaced or super Nyquist spaced signals in a media-channel.

First claim

What is claimed is:

1. A method to control optical signals in a spectrally overlapped, flexible grid spectrum system, the method comprising:
receiving measured power within a control bandwidth for an optical signal, wherein the control bandwidth is less than a spectral occupancy of the optical signal and equal to or greater than a resolution bandwidth of a measurement device configured to measure the measured power, and wherein signal bandwidth of the optical signal minus overlapped bandwidth is greater than or equal to the control bandwidth, such that the measured power is not affected by power contributions associated with neighboring signals; and
controlling the optical signal based on the measured power and a target power within the control bandwidth.

2. The method of claim 1 , wherein the control bandwidth is close to a center frequency of the optical signal.

3. The method of claim 2 , wherein the control bandwidth is shifted responsive to a peak power measurement being offset from the center frequency.

4. The method of claim 1 , wherein the measurement device is a low-resolution Optical Channel Monitor (OCM) at an Optical Add/Drop Multiplex (OADM) node.

5. The method of claim 1 , wherein the optical signals comprise one of Nyquist spaced and super Nyquist spaced signals in a media-channel.

6. The method of claim 1 , wherein the controlling comprises applying new adjustment values to actuators in the control bandwidth based on a control process between the measured power and the target power and applying new adjustment values to actuators outside the control bandwidth based on the control process and a relative bias based on a target spectral shape.

7. An apparatus configured to control optical signals in a spectrally overlapped, flexible grid spectrum system, the apparatus comprising:
a network interface and a processor coupled to one another; and
memory storing instructions that, when executed, cause the processor to
receive, via the network interface, measured power within a control bandwidth for an optical signal, wherein the control bandwidth is less than a spectral occupancy of the optical signal and equal to or greater than a resolution bandwidth of a measurement device configured to measure the measured power, wherein signal bandwidth of the optical signal minus overlapped bandwidth is greater than or equal to the control bandwidth, such that the measured power is not affected by power contributions associated with neighboring signals, and
cause control of the optical signal based on the measured power and a target power within the control bandwidth.

8. The apparatus of claim 7 , wherein the control bandwidth is close to a center frequency of the optical signal.

9. The apparatus of claim 8 , wherein the control bandwidth is shifted responsive to a peak power measurement being offset from the center frequency.

10. The apparatus of claim 7 , wherein the measurement device is a low-resolution Optical Channel Monitor (OCM) at an Optical Add/Drop Multiplex (OADM) node.

11. The apparatus of claim 7 , wherein the optical signals comprise one of Nyquist spaced and super Nyquist spaced signals in a media-channel.

12. The apparatus of claim 7 , wherein the control comprises application of new adjustment values to actuators in the control bandwidth based on a control process between the measured power and the target power and application of new adjustment values to actuators outside the control bandwidth based on the control process and a relative bias.

13. A method to control optical signals in a spectrally overlapped, flexible grid spectrum system, the method comprising:
receiving measured power within a control bandwidth for an optical signal, wherein the control bandwidth is less than a spectral occupancy of the optical signal and equal to or greater than a resolution bandwidth of a measurement device configured to measure the measured power, wherein the control bandwidth is close to a center frequency of the optical signal, and wherein the control bandwidth is shifted responsive to a peak power measurement being offset from the center frequency; and
controlling the optical signal based on the measured power and a target power within the control bandwidth.

14. The method of claim 13 , wherein the measurement device is a low-resolution Optical Channel Monitor (OCM) at an Optical Add/Drop Multiplex (OADM) node.

15. The method of claim 13 , wherein the optical signals comprise one of Nyquist spaced and super Nyquist spaced signals in a media-channel.

16. The method of claim 13 , wherein the spectral occupancy is greater than the control bandwidth and the control bandwidth is equal to or greater than a resolution bandwidth; and
wherein signal bandwidth of the optical signal minus overlapped bandwidth is greater than or equal to the control bandwidth, such that the measured power is not affected by power contributions associated with neighboring signals.

17. The method of claim 13 , wherein the controlling comprises applying new adjustment values to actuators in the control bandwidth based on a control process between the measured power and the target power and applying new adjustment values to actuators outside the control bandwidth based on the control process and a relative bias based on a target spectral shape.

Assignees

• Ciena Corp

Inventors

• Al Sayeed Choudhury A
• Chen Edward
• Chedore Paul
• Kohlert Scott

Classifications

• H04J14/0221 Primary

  Power control, e.g. to keep the total optical power constant · CPC title

• H04J14/0201

  Add-and-drop multiplexing · CPC title

• H04B10/07955 Primary

  Monitoring or measuring power · CPC title

• H04J14/02216

  by gain equalization · CPC title