Optical network evaluation systems and methods

• US 7,903,970 B2
• Filed: 03/30/2007
• Issued: 03/08/2011
• Est. Priority Date: 03/30/2007
• Status: Expired due to Fees

• Current Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Original Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Inventors: Ji, Chuanyi, Liu, Guanglei
• Primary Examiner(s): Li; Shi K
• Assistant Examiner(s): Leung; Danny W.
• Application Number:
  US11/694,039
• Publication Number:
  US 20080240711A1
• Time in Patent Office: 1,439 Days
• Field of Search: 398/25, 398/40, 398/57
• US Class Current: 398/57
• CPC Class Codes: H04B 10/0793 Network aspects, e.g. central monitoring of transmission parameters

Abstract

Embodiments of optical network evaluation systems and methods are disclosed. One system embodiment, among others, comprises a processor configured with logic to provide a cross layer model of disturbance propagation in an optical network based on a combination of a physical layer model and a network layer model, the physical layer mode based on the disturbance propagation having a threshold effect only on nodes along a route followed by the disturbance.

Claims

1. A computer-implemented method for optical network evaluation, comprising:

for a physical model, modeling propagation of a disturbance in an optical network under static network conditions based on the disturbance propagation having a threshold effect only on nodes along a route followed by the disturbance, the modeling implemented by a computer;

for a network model, modeling a status of each network route in the optical network based on the disturbance, the modeling implemented by the computer; and

combining the physical layer model and the network layer model to provide a cross layer model that characterizes the disturbance propagation based on network layer and physical layer dependencies and interactions in the optical network, the combining implemented by the computer, wherein modeling the status comprises determining a probability distribution of active connections in the optical network and the number of affected wavelength channels, the modeling implemented by the computer;

wherein all active wavelength channels in the switching plane of node V_i are affected if node V_i is affected by the disturbance, wherein

2. The method of claim 1, further comprising determining resilience of the optical network based on the cross layer model, the determining implemented by the computer.

3. The method of claim 1, wherein the physical model is represented by a directed graph.

4. The method of claim 1, wherein the network model is represented by an undirected probabilistic graph.

5. The method of claim 1, further comprising displaying the cross layer model as a factor graph representation.

6. The method of claim 1, wherein the disturbance comprises crosstalk.

7. The method of claim 1, wherein the optical network is an all optical network.

8. The method of claim 1, wherein the physical layer model comprises the following equation:

9. The method of claim 8, wherein the network layer model comprises the following equation:

10. The method of claim 9, wherein the cross layer model comprises the following equation:

P(X_fsd,S_fsd,N|R_f=f_sd)=P(S_fsd,X_fsd|N,R_f=f_sd)P(N|R_f=f_sd),

where X_fsd=(X_i;

V_i∈

V_fsd) and S_fsd=(S_i;

V_i∈

V_fsd), P(S_fsd,X_fsd|N,R_f=f_sd) corresponds to the physical layer model, which characterizes the probability distribution of the status and the number of affected channels at each node on the attacker'"'"'s route given the status of each route and the source of attack, P(N|R_f=f_sd) corresponds to the network layer model, which characterizes the probability distribution of the status of each network route given the source of attack.

11. A system, comprising:

a processor; and

memory including executable instructions that, when implemented by the processor;

provide a cross layer model of disturbance propagation of a disturbance in an optical network by combining a physical layer model of the optical network and a network layer model of the optical network, the physical layer model based on the disturbance propagation having a threshold effect only on nodes along a route followed by the disturbance;

provide the physical layer model of the optical network, wherein the physical layer model comprises the following equation;

12. The system of claim 11, wherein the executable instructions when implemented by the processor, provide the network layer model of the optical network, the network layer model comprising the following equation:

13. The system of claim 12, wherein the executable instructions, when implemented by the processor, provide a cross-layer model, wherein the cross layer model comprises the following equation:

P(X_fsd,S_fsd,N|R_f=f_sd)=P(S_fsd,X_fsd|N,R_f=f_sd)P(N|R_f=f_sd),

where X_fsd=(X_i;

V_i∈

V_fsd) and S_fsd=(S_i;

V_i∈

V_fsd), P(S_fsd,X_fsd|N,R_f=f_sd) corresponds to the physical layer model, which characterizes the probability distribution of the status and the number of affected channels at each node on the attacker'"'"'s route given the status of each route and the source of attack, P(N|R_f=f_sd) corresponds to the network layer model, which characterizes the probability distribution of the status of each network route given the source of attack.

14. The system of claim 11, wherein the resilience of the optical network includes an upper bound and a lower bound.

15. The system of claim 11, wherein the executable instructions, when implemented by the processor, represent the cross layer model graphically as a factor graph representation.

16. The system of claim 11, wherein the disturbance comprises crosstalk.

17. The system of claim 11, wherein the optical network is an all optical network.

18. A non-transitory, tangible computer readable medium having a program stored thereon for execution by an instruction execution system to model network layer and physical layer interactions and dependencies in an optical network, the program for performing the steps of:

for a physical layer model, modeling propagation of a disturbance in an optical network under static network conditions based on the disturbance propagation having a threshold effect only on nodes along a route followed by the disturbance, where the physical layer model comprises the following equation;

19. The non-transitory, tangible computer readable medium of claim 18, wherein the network layer model comprises the following equation: