Optical Network Evaluation Systems and Methods

• US 20080240711A1
• Filed: 03/30/2007
• Published: 10/02/2008
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• 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
• Granted Patent: US 7,903,970 B2
• Time in Patent Office: Days
• US Class Current: 398/9
• 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 method, 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;

for a network model, modeling a status of each network route in the optical network based on the disturbance; 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.

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

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, wherein modeling the status comprises determining a probability distribution of active connections in the optical network and the number of affected wavelength channels.

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

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

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

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

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

11. The method of claim 10, 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,S_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.

12. A system, comprising:

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.

13. The system of claim 12, wherein the processor is further configured with the logic to provide a physical layer model, wherein the physical layer model comprises the following equation:

14. The system of claim 13, wherein the processor is further configured with the logic to provide a network layer model, the network layer model comprising the following equation:

15. The system of claim 14, wherein the processor is further configured with the logic to 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,S_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.

16. The system of claim 12, wherein the processor is further configured with the logic to determine resilience of the optical network based on the cross layer model.

17. The system of claim 12, wherein the processor is further configured with the logic to represent the cross layer model graphically as a factor graph representation.

18. The system of claim 12, wherein the disturbance comprises crosstalk.

19. The system of claim 12, wherein the optical network is an all optical network.

20. A computer readable medium having a program stored thereon to model network layer and physical layer interactions and dependencies in an optical network, the program for performing the steps of:

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;

for a network model, modeling a status of each network route in the optical network based on the disturbance; 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.