Margin-based optimization systems and methods in optical networks for capacity boosting

• US 9,438,369 B2
• Filed: 11/10/2014
• Issued: 09/06/2016
• Est. Priority Date: 05/19/2014
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Swinkels, Gerard L., Boertjes, David W., Miedema, David, Roberts, Kim B.
• Primary Examiner(s): Wolf, Darren E
• Application Number:
  US14/536,792
• Publication Number:
  US 20150333824A1
• Time in Patent Office: 666 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 10/00 Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
• CPC Class Codes: H04B 10/0795 Performance monitoring; Measurement of transmission parameters
• CPC Class Codes: H04B 10/25 Arrangements specific to fibre transmission
• CPC Class Codes: H04B 10/2589 Bidirectional transmission
• CPC Class Codes: H04B 10/40 Transceivers
• CPC Class Codes: H04B 10/50 Transmitters
• CPC Class Codes: H04B 10/572 Wavelength control
• CPC Class Codes: H04B 10/58 Compensation for non-linear transmitter output
• CPC Class Codes: H04B 10/60 Receivers
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0241 Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
• CPC Class Codes: H04J 14/0257 Wavelength assignment algorithms
• CPC Class Codes: H04J 14/0271 Impairment aware routing
• CPC Class Codes: H04L 1/0023 characterised by the signalling

Abstract

Systems and methods of optimizing capacity of an optical network include identifying a first wavelength with an associated target capacity; determining that the first wavelength has insufficient capability to operate at the associated target capacity; and adjusting one or more wavelengths to increase capability of the first wavelength such that the first wavelength can operate at the associated target capacity.

Claims

1. A method of optimizing capacity of an optical network, the method comprising:

identifying a first wavelength with an associated target capacity;

determining that the first wavelength has insufficient capability to operate at the associated target capacity by comparing one or more parameters associated with the first wavelength to one or more predetermined thresholds;

performing a nonlinear optimization of excess margin in the optical network, the performing comprising modeling bit rate, Optical Signal to Noise Ratio (OSNR), and whether or not a wavelength can support additional capacity as real functions; and

adjusting one or more wavelengths in the optical network separate from the first wavelength to increase capability of the first wavelength to operate at the associated target capacity, wherein the adjusting is in response to a result of the nonlinear optimization.

2. The method of claim 1, wherein the adjusting utilizes any one of modifying average power, changing wavelength, changing modulation, and changing precompensation.

3. The method of claim 1, wherein the one or more parameters are any of additive noise, Cross-Phase Modulation, Cross-Polarization Modulation, and spectral width.

4. The method of claim 1, wherein the one or more parameters are measured by a modem associated with the first wavelength.

5. The method of claim 1, wherein the insufficient capability is based on any of noise margin and spectral width.

6. The method of claim 1, wherein the insufficient capability is not enough to either presently meet a performance for the associated target capacity or to meet a performance for the associated target capacity at a future time.

7. The method of claim 1, wherein the adjusting utilizes changing modulation to achieve any one of reduced nonlinear aggression, reduced spectral width, and changed spectral shape.

8. The method of claim 1, wherein the adjusting is simulated in an application prior to operation on nodes in the optical network.

9. A controller for optimizing capacity of an optical network, the controller comprising:

a processor communicatively coupled to a network interface; and

memory storing instructions that, when executed, cause the processor to identify a first wavelength with an associated target capacity,

determine that the first wavelength has insufficient capability to operate at the associated target capacity by a comparison of one or more parameters associated with the first wavelength to one or more predetermined thresholds,

perform a nonlinear optimization of excess margin in the optical network, wherein the nonlinear optimization models bit rate, Optical Signal to Noise Ratio (OSNR), and whether or not a wavelength can support additional capacity as real functions; and

cause or simulate adjustment of one or more wavelengths in the optical network separate from the first wavelength to increase capability of the first wavelength to operate at the associated target capacity, wherein the adjustment is in response to a result of the nonlinear optimization.

10. The controller of claim 9, wherein the adjustment utilizes any of modifying average power, changing wavelength, changing modulation, and changing precompensation.

11. The controller of claim 9, wherein the one or more parameters are any of additive noise, Cross-Phase Modulation, Cross-Polarization Modulation, and spectral width.

12. The controller of claim 9, wherein the one or more parameters are measured by a modem associated with the first wavelength.

13. The controller of claim 9, wherein the insufficient capability is based on any of noise margin and spectral width.

14. The controller of claim 9, wherein the insufficient capability is not enough to either presently meet a performance for the associated target capacity or to meet a performance for the associated target capacity at a future time.

15. The controller of claim 9, wherein the adjustment utilizes changing modulation to any of reduce nonlinear aggression, reduce spectral width, and change spectral shape.

16. An optical network, comprising:

a plurality of nodes interconnected by a plurality of links; and

a controller communicatively coupled to one or more of the plurality of nodes, wherein the controller is configured to

identify a first wavelength, between two of the plurality of nodes, with an associated target capacity,

determine that the first wavelength has insufficient capability to operate at the associated target capacity by a comparison of one or more parameters associated with the first wavelength to one or more predetermined thresholds,

perform a nonlinear optimization of excess margin in the optical network, wherein the nonlinear optimization models bit rate, Optical Signal to Noise Ratio (OSNR), and whether or not a wavelength can support additional capacity as real functions; and

cause or simulate adjustment of one or more wavelengths separate from the first wavelength, on some or all links associated with the first wavelength, to increase capability of the first wavelength to operate at the associated target capacity, wherein the adjustment is in response to a result of the nonlinear optimization.