Reachability determination in wavelength division multiplexing network based upon fiber loss measurements

Patent metadata

Field	Value
Publication number	US-10554301-B2
Application number	US-201916267229-A
Country	US
Kind code	B2
Filing date	Feb 4, 2019
Priority date	Jun 14, 2017
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

Devices, computer-readable media and methods are disclosed for determining reachability for a wavelength connection in a telecommunication network. For example, a processor deployed in a telecommunication network may calculate a fiber loss on a link in the telecommunication network using optical power measurements and determine that a destination node of a wavelength connection is not reachable via a path that includes the link based upon the fiber loss of the link that is calculated. In one example, the determining is based upon a number of links in the path, an effective fiber loss for each link in the path, a penalty for nodes in the path, and an acceptable loss value. The processor may further perform a remedial action in response to determining that the destination node of the wavelength connection is not reachable via the path.

First claim

What is claimed is:

1. A device comprising:
a processor deployed in a telecommunication network; and
a computer-readable medium storing instructions which, when executed by the processor, cause the processor to perform operations, the operations comprising:
receiving a request to establish a wavelength connection between a first node and a second node in the telecommunication network, the request including information on an expected duration of the wavelength connection;
determining whether the second node is reachable from the first node using an acceptable loss value, wherein the acceptable loss value is based upon the expected duration of the wavelength connection; and
configuring the telecommunication network based upon whether the second node is determined to be reachable from the first node.

2. The device of claim 1 , wherein a reduced acceptable loss value is utilized when the request is for a persistent wavelength connection as compared to an acceptable loss value that is utilized when the request is for a non-persistent wavelength connection.

3. The device of claim 1 , wherein the determining is based upon:
a number of links in the path;
an effective fiber loss for each link in the path;
a penalty for nodes in the path; and
the acceptable loss value.

4. The device of claim 3 , wherein the determining is based upon:
∥10×[log 10 {Σ i=1 n (1/ l i )}]∥+( n− 1) h≤∥R∥

where n is the number of links in the path, l i is the effective fiber loss for each link i, h is the penalty for nodes in the path, and R is the acceptable loss value.

5. The device of claim 3 , wherein the determining is based upon:
∥10×[log 10 {Σ i=1 n (1/ l i )}]∥+ mh AMP +( n− 1) h ROADM ≤∥R∥

where n is the number of links in the path, l i is the effective fiber loss for each link i, m is a number of amplifiers in the path, h AMP is a loss for optical amplifiers in the path, h ROADM is a loss for reconfigurable optical add-drop multiplexers in the path, and R is the acceptable loss value.

6. The device of claim 3 , wherein the effective fiber loss for each link is specific to a wavelength of the wavelength connection.

7. The device of claim 1 , wherein the acceptable loss value is based on an end of life acceptable loss for a single link and a margin.

8. A method comprising:
receiving, by a processor deployed in a telecommunication network, a request to establish a wavelength connection between a first node and a second node in the telecommunication network, the request including information on an expected duration of the wavelength connection;
determining, by the processor, whether the second node is reachable from the first node using an acceptable loss value, wherein the acceptable loss value is based upon the expected duration of the wavelength connection; and
configuring, by the processor, the telecommunication network based upon whether the second node is determined to be reachable from the first node.

9. The method of claim 8 , wherein a reduced acceptable loss value is utilized when the request is for a persistent wavelength connection as compared to an acceptable loss value that is utilized when the request is for a non-persistent wavelength connection.

10. The method of claim 8 , wherein the determining is based upon:
a number of links in the path;
an effective fiber loss for each link in the path;
a penalty for nodes in the path; and
the acceptable loss value.

11. The method of claim 10 , wherein the determining is based upon:
∥10×[log 10 {Σ i=1 n (1/ l i )}]∥+( n− 1) h≤∥R∥

where n is the number of links in the path, l i is the effective fiber loss for each link i, h is the penalty for nodes in the path, and R is the acceptable loss value.

12. The method of claim 10 , wherein the determining is based upon:
∥10×[log 10 {Σ i=1 n (1/ l i )}]∥+ mh AMP +( n− 1) h ROADM ≤∥R∥

where n is the number of links in the path, l i is the effective fiber loss for each link i, m is a number of amplifiers in the path, h AMP is a loss for optical amplifiers in the path, h ROADM is a loss for reconfigurable optical add-drop multiplexers in the path, and R is the acceptable loss value.

13. The method of claim 10 , wherein the effective fiber loss for each link is specific to a wavelength of the wavelength connection.

14. The method of claim 8 , wherein the acceptable loss value is based on an end of life acceptable loss for a single link and a margin.

15. A non-transitory computer-readable medium storing instructions which, when executed by a processor deployed in a telecommunication network, cause the processor to perform operations, the operations comprising:
receiving a request to establish a wavelength connection between a first node and a second node in the telecommunication network, the request including information on an expected duration of the wavelength connection;
determining whether the second node is reachable from the first node using an acceptable loss value, wherein the acceptable loss value is based upon the expected duration of the wavelength connection; and
configuring the telecommunication network based upon whether the second node is determined to be reachable from the first node.

16. The non-transitory computer-readable medium of claim 15 , wherein a reduced acceptable loss value is utilized when the request is for a persistent wavelength connection as compared to an acceptable loss value that is utilized when the request is for a non-persistent wavelength connection.

17. The non-transitory computer-readable medium of claim 15 , wherein the determining is based upon:
a number of links in the path;
an effective fiber loss for each link in the path;
a penalty for nodes in the path; and
the acceptable loss value.

18. The non-transitory computer-readable medium of claim 17 , wherein the determining is based upon:
∥10×[log 10 {Σ i=1 n (1/ l i )}]∥+( n− 1) h≤∥R∥

where n is the number of links in the path, l i is the effective fiber loss for each link i, h is the penalty for nodes in the path, and R is the acceptable loss value.

19. The non-transitory computer-readable medium of claim 17 , wherein the determining is based upon:
∥10×[log 10 {Σ i=1 n (1/ l i )}]∥+ mh AMP +( n− 1) h ROADM ≤∥R∥

where n is the number of links in the path, l i is the effective fiber loss for each link i, m is a number of amplifiers in the path, h AMP is a loss for optical amplifiers in the path, h ROADM is a loss for reconfigurable optical add-drop multiplexers in the path, and R is the acceptable loss value.

20. The non-transitory computer-readable medium of claim 17 , wherein the effective fiber loss for each link is specific to a wavelength of the wavelength connection.

Assignees

• At & T Ip I Lp

Inventors

• Woodward Sheryl
• Tse Kathleen
• Birk Martin
• Chiu Angela
• Bathula Balagangadhar

Classifications

• H04Q11/0066

  Provisions for optical burst or packet networks · CPC title

• H04B10/07953 Primary

  Monitoring or measuring OSNR, BER or Q · CPC title

• H04Q2011/0083

  Testing; Monitoring · CPC title

• H04Q2011/0073

  Provisions for forwarding or routing, e.g. lookup tables · CPC title

• H04Q11/00

  Selecting arrangements for multiplex systems (multiplex systems H04J) · CPC title