Virtual optical network service with guaranteed availability

• US 10,355,779 B2
• Filed: 09/25/2017
• Issued: 07/16/2019
• Est. Priority Date: 09/25/2017
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kim, Inwoong, Wang, Xi, Bouda, Martin, Vassilieva, Olga, Zhang, Qiong, Palacharla, Paparao, Ikeuchi, Tadashi
• Primary Examiner(s): Cors, Nathan M
• Application Number:
  US15/714,420
• Publication Number:
  US 20190097720A1
• Time in Patent Office: 659 Days
• CPC Class Codes: H04B 10/0775 Performance monitoring and measurement of transmission parameters
• CPC Class Codes: H04B 10/0793 Network aspects, e.g. central monitoring of transmission parameters
• CPC Class Codes: H04B 10/07953 Monitoring or measuring OSNR, BER or Q
• 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 14/0257 Wavelength assignment algorithms
• CPC Class Codes: H04J 14/0271 Impairment aware routing
• CPC Class Codes: H04Q 11/0066 Provisions for optical burst or packet networks
• CPC Class Codes: H04Q 11/0067 Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• CPC Class Codes: H04Q 2011/0073 Provisions for forwarding or routing, e.g. lookup tables
• CPC Class Codes: H04Q 2011/0084 Quality of service aspects

Abstract

A method for VON service with guaranteed availability may use probability density functions (PDF) of Q-factor to determine availability of physical links assigned to a virtual link in the VON. Then, a VON mapping may be performed based on the determined availabilities, among other factors.

Claims

1. A method, comprising:

identifying an optical path that is used to represent a virtual link in a virtual optical network (VON), including identifying physical nodes and physical links for the optical path;

determining a minimum availability associated with the virtual link;

identifying a plurality of wavelength configurations for the optical path, the wavelength configurations comprising a modulation format, a forward error correction (FEC) ratio, a baud rate, and a launch optical power of an optical signal transmitted over the optical path;

determining a probability density function (PDF) for an optical signal-to-noise ratio (OSNR) for the optical path;

based on the PDF for the OSNR, respectively determining a PDF for a Q-factor for each of the wavelength configurations;

from the PDFs for the Q-factor, respectively determining a calculated availability for each of the wavelength configurations using an integral of the PDF over the Q-factor;

selecting a first wavelength configuration from the wavelength configurations using the calculated availability; and

sending instructions to a transmitter and a receiver for the optical path to implement the wavelength configuration for the optical signal.

2. The method of claim 1, wherein determining the PDF for the OSNR further comprises:

measuring optical performance of network traffic transmitted over the optical path to calculate a second PDF for a Q-factor corresponding to a second wavelength configuration for the optical path; and

using the second PDF for the Q-factor for determining the PDF for the OSNR.

3. The method of claim 1, wherein determining the PDF for the OSNR further comprises:

using an analytical model of the optical path to estimate a second PDF for a Q-factor corresponding to a second wavelength configuration for the optical path; and

using the second PDF for the Q-factor for determining the PDF for the OSNR.

4. The method of claim 3, further comprising:

measuring optical performance of network traffic transmitted over the optical path to calculate a third PDF for a Q-factor corresponding to the first wavelength configuration for the optical path; and

using the third PDF for the Q-factor for updating the PDF for the OSNR.

5. The method of claim 1, wherein respectively determining the calculated availability for each of the wavelength configurations using an integral of the PDF over the Q-factor further comprises:

determining the calculated availability from a threshold Q-factor, wherein the calculated availability is given by the integral from the threshold Q to infinity.

6. The method of claim 1, wherein selecting the first wavelength configuration further comprises selecting the first wavelength according to the calculated availability.

7. The method of claim 1, wherein selecting the first wavelength configuration further comprises selecting the first wavelength according to a cost function based on a metric for each of the wavelength configurations.

8. The method of claim 7, wherein the metric is selected from at least one of:

a data rate, a spectral efficiency, a time averaged aggregate data rate, and a time averaged spectral efficiency.

9. A network management system, comprising:

a processor enabled to access a memory media storing instructions executable by the processor for;

identifying an optical path that is used to represent a virtual link in a virtual optical network (VON), including identifying physical nodes and physical links for the optical path;

determining a minimum availability associated with the virtual link;

identifying a plurality of wavelength configurations for the optical path, the wavelength configurations comprising a modulation format, a forward error correction (FEC) ratio, a baud rate, and a launch optical power of an optical signal transmitted over the optical path;

determining a probability density function (PDF) for an optical signal-to-noise ratio (OSNR) for the optical path;

based on the PDF for the OSNR, respectively determining a PDF for a Q-factor for each of the wavelength configurations;

from the PDFs for the Q-factor, respectively determining a calculated availability for each of the wavelength configurations using an integral of the PDF over the Q-factor;

selecting a first wavelength configuration from the wavelength configurations using the calculated availability; and

sending instructions to a transmitter and a receiver for the optical path to implement the wavelength configuration for the optical signal.

10. The network management system of claim 9, wherein determining the PDF for the OSNR further comprises:

measuring optical performance of network traffic transmitted over the optical path to calculate a second PDF for a Q-factor corresponding to a second wavelength configuration for the optical path; and

using the second PDF for the Q-factor for determining the PDF for the OSNR.

11. The network management system of claim 9, wherein determining the PDF for the OSNR further comprises:

using an analytical model of the optical path to estimate a second PDF for a Q-factor corresponding to a second wavelength configuration for the optical path; and

using the second PDF for the Q-factor for determining the PDF for the OSNR.

12. The network management system of claim 11, further comprising instructions for:

measuring optical performance of network traffic transmitted over the optical path to calculate a third PDF for a Q-factor corresponding to the first wavelength configuration for the optical path; and

using the third PDF for the Q-factor for updating the PDF for the OSNR.

13. The network management system of claim 9, wherein respectively determining the calculated availability for each of the wavelength configurations using an integral of the PDF over the Q-factor further comprises:

determining the calculated availability from a threshold Q-factor, wherein the calculated availability is given by the integral from the threshold Q-factor to infinity.

14. The network management system of claim 9, wherein selecting the first wavelength configuration further comprises selecting the first wavelength according to a cost function based on a metric for each of the wavelength configurations.

15. The network management system of claim 14, wherein the metric is selected from at least one of:

a data rate, a spectral efficiency, a time averaged aggregate data rate, and a time averaged spectral efficiency.

16. An optical network comprising:

a network management system, further comprising a processor enabled to access a memory media storing instructions executable by the processor for;

identifying an optical path that is used to represent a virtual link in a virtual optical network (VON), including identifying physical nodes and physical links in the optical network for the optical path;

determining a minimum availability associated with the virtual link;

identifying a plurality of wavelength configurations for the optical path, the wavelength configurations comprising a modulation format, a forward error correction (FEC) ratio, a baud rate, and a launch optical power of an optical signal transmitted over the optical path;

determining a probability density function (PDF) for an optical signal-to-noise ratio (OSNR) for the optical path;

based on the PDF for the OSNR, respectively determining a PDF for a Q-factor for each of the wavelength configurations;

from the PDFs for the Q-factor, respectively determining a calculated availability for each of the wavelength configurations using an integral of the PDF over the Q-factor;

selecting a first wavelength configuration from the wavelength configurations the calculated availability; and

sending instructions to a transmitter and a receiver for the optical path to implement the wavelength configuration for the optical signal.

17. The optical network of claim 16, wherein determining the PDF for the OSNR further comprises:

measuring optical performance of network traffic transmitted over the optical path to calculate a second PDF for a Q-factor corresponding to a second wavelength configuration for the optical path; and

using the second PDF for the Q-factor for determining the PDF for the OSNR.

18. The optical network of claim 16, wherein determining the PDF for the OSNR further comprises:

using an analytical model of the optical path to estimate a second PDF for a Q-factor corresponding to a second wavelength configuration for the optical path; and

using the second PDF for the Q-factor for determining the PDF for the OSNR.

19. The optical network of claim 18, further comprising instructions for:

measuring optical performance of network traffic transmitted over the optical path to calculate a third PDF for a Q-factor corresponding to the first wavelength configuration for the optical path; and

using the third PDF for the Q-factor for updating the PDF for the OSNR.

20. The optical network of claim 16, wherein respectively determining the calculated availability for each of the wavelength configurations using an integral of the PDF over the Q-factor further comprises:

determining the calculated availability from a threshold Q-factor, wherein the calculated availability is given by the integral from the threshold Q-factor to infinity.

21. The optical network of claim 16, wherein selecting the first wavelength configuration further comprises selecting the first wavelength according to a cost function based on a metric for each of the wavelength configurations.

22. The optical network of claim 21, wherein the metric is selected from at least one of:

a data rate, a spectral efficiency, a time averaged aggregate data rate, and a time averaged spectral efficiency.