Optical switch router
View Patent ↗An optical switch router performs both optical switching and traditional routing. The optical switch router includes optical interfaces for coupling to one or more incoming optical fibers and to one or more outgoing optical fibers, and also includes a number of traditional router ports. Individual incoming optical data streams received over the incoming optical fiber(s) can be selectively passed through to one or more of the outgoing optical fibers or “dropped” from the optical communication path for traditional routing. Routed traffic, which can be received over the router ports or from the “dropped” optical data streams, can be forwarded over optical data streams that are “added” to the outgoing optical fiber(s). The “added” optical data streams may be added to the outgoing optical fiber(s) at any unused wavelengths, including, but not limited to, the wavelengths of the “dropped” optical data streams.
1. A network device comprising:
optical switching logic coupled between a plurality of input optical interfaces and a plurality of output optical interfaces, for selectively forwarding an optical data stream having a given wavelength to either one of the optical interfaces for output on at least one optical fiber or to routing logic, the optical data stream comprising a plurality of packets; and
wherein the routing logic is operably coupled to the switching logic to selectively receive the optical data stream from the optical switching logic and retrieve routing information from the optical data stream, wherein the routing information is used to dynamically control the forwarding of subsequent optical data streams transmitted at the given wavelength through the optical switch logic to one of the output optical interfaces on the at least one optical fiber for performing open shortest path first (OSPF) forwarding.
2. The networking device of claim 1 , wherein the optical switching logic is operably coupled to receive an incoming optical data stream from an incoming optical fiber over an incoming optical interface and selectively pass the incoming optical data stream through to an outgoing optical fiber over an outgoing optical interface or divert the incoming optical data stream for processing by the routing logic.
3. The networking device of claim 2 , wherein the optical switching logic comprises a demultiplexer operably coupled to demultiplex the incoming optical data stream from a number of incoming optical data streams received from the incoming optical fiber over the incoming optical interface.
4. The networking device of claim 3 , wherein the optical switching logic further comprises an optical switch operably coupled to receive the incoming optical data stream from the demultiplexer and to selectively pass the incoming optical data stream through to the outgoing optical fiber over the outgoing optical interface or divert the incoming optical data stream for processing by the routing logic.
5. The networking device of claim 4 , wherein the optical switching logic further comprises an optical receiver operably coupled to receive the diverted incoming optical data stream from the optical switch and convert the diverted incoming optical data stream into incoming digitally formatted information for processing by the routing logic.
6. The networking device of claim 5 , wherein the routing logic is operably coupled to receive the incoming digitally formatted information from the optical receiver and route the incoming digitally formatted information based upon a routing mechanism.
7. The networking device of claim 3 , wherein the optical switch comprises an optical add/drop fabric.
8. The networking device of claim 3 , wherein the optical switch comprises an optical drop-only fabric.
9. The networking device of claim 1 , wherein the routing logic is operably coupled to forward outgoing digitally formatted information to the optical switching logic for forwarding to an outgoing optical fiber over an outgoing optical interface.
10. The networking device of claim 9 , wherein the optical switching logic is operably coupled to receive the outgoing digitally formatted information from the routing logic and output an outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
11. The networking device of claim 10 , wherein the optical switching logic comprises an optical transmitter operably coupled to receive the outgoing digitally formatted information from the routing logic and produce the outgoing optical data stream from the digitally formatted information at a predetermined wavelength.
12. The networking device of claim 11 , wherein the optical transmitter comprises a fixed wavelength laser for producing the outgoing optical data stream at the predetermined wavelength.
13. The networking device of claim 11 , wherein the optical transmitter comprises a tunable laser tuned to produce the outgoing optical data stream at the predetermined wavelength.
14. The networking device of claim 11 , wherein the optical switching logic further comprises:
an optical switch operably coupled to receive the outgoing optical data stream from the optical transmitter; and
a multiplexer operably coupled to receive the outgoing optical data stream from the optical switch and add the outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
15. The networking device of claim 14 , wherein the optical switch comprises an optical add/drop fabric.
16. The networking device of claim 11 , wherein the optical switching logic further comprises a combiner operably coupled to receive the outgoing optical data stream from the optical transmitter and add the outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
17. The networking device of claim 1 , wherein the networking device is an optical switch router.
18. A system comprising at least two network devices, each network device including:
optical switching logic coupled between a plurality of input optical interfaces and a plurality of output optical interfaces, for selectively forwarding an optical data stream having a given wavelength to either one of the optical interfaces for output on at least one optical fiber or to routing logic, the optical data stream comprising a plurality of packets; and
whereby the routing logic is operably coupled to the switching logic to selectively receive the optical data stream having the given wavelength from the optical switching logic and retrieve routing information from the optical data stream, wherein the routing information is used to dynamically control the forwarding of subsequent optical data streams transmitted at the given wavelength through the optical switch logic to one of the output optical interfaces on the at least one optical fiber for performing Open Shortest Path First (OSPF forwarding.
19. The system of claim 18 , wherein the optical switching logic is operably coupled to receive an incoming optical data stream from an incoming optical fiber over an incoming optical interface and selectively pass the incoming optical data stream through to an outgoing optical fiber over an outgoing optical interface or diver the incoming optical data stream for processing by the routing logic.
20. The system of claim 19 , wherein the optical switching logic comprises a demultiplexer operably coupled to demultiplex the incoming optical data stream from a number of incoming optical data streams received from the incoming optical fiber over the incoming optical interface.
21. The system of claim 20 , wherein the optical switching logic further comprises an optical switch operably coupled to receive the incoming optical data stream from the demultiplexer and to selectively pass the incoming optical data stream through to the outgoing optical fiber over the outgoing optical interface or divert the incoming optical data stream for processing by the routing logic.
22. The system of claim 21 , wherein the optical switching logic further comprises an optical receiver operably coupled to receive the diverted incoming optical data stream from the optical switch and convert the diverted incoming optical data stream into incoming digitally formatted information for processing by the routing logic.
23. The system of claim 22 , wherein the routing logic is operably coupled to receive the incoming digitally formatted information from the optical receiver and route the incoming digitally formatted information based upon a routing mechanism.
24. The system of claim 20 , wherein the optical switch comprises an optical add/drop fabric.
25. The system of claim 20 , wherein the optical switch comprises an optical drop-only fabric.
26. The system of claim 18 , wherein the routing logic is operably coupled to forward outgoing digitally formatted information to the optical switching logic for forwarding to an outgoing optical fiber over an outgoing optical interface.
27. The system of claim 26 , wherein the optical switching logic is operably coupled to receive the outgoing digitally formatted information from the routing logic and output an outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
28. The system of claim 27 , wherein the optical switching logic comprises an optical transmitter operably coupled to receive the outgoing digitally formatted information from the routing logic and produce the outgoing optical data stream from the digitally formatted information at a predetermined wavelength.
29. The system of claim 28 , wherein the optical transmitter comprises a fixed wavelength laser for producing the outgoing optical data stream at the predetermined wavelength.
30. The system of claim 28 , wherein the optical transmitter comprises a tunable laser tuned to produce the outgoing optical data stream at the predetermined wavelength.
31. The system of claim 28 , wherein the optical switching logic further comprises:
an optical switch operably coupled to receive the outgoing optical data stream from the optical transmitter; and
a multiplexer operably coupled to receiver the outgoing optical data stream from the optical switch and add the outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
32. The system of claim 31 , wherein the optical switch comprises an optical add/drop fabric.
33. The system of claim 28 , wherein the optical switching logic further comprises a combiner operably coupled to receive the outgoing optical data stream from the optical transmitter and add the outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
34. The system of claim 18 , wherein the system is an optical switching/routing system.
35. An optical line card for use in a networking device, the optical line card comprising:
a router interface; and
optical switching logic operably coupled to receive an incoming optical data stream having a given wavelength from an incoming optical fiber over an incoming optical interface and selectively pass the incoming optical data stream either through to an outgoing optical fiber over an outgoing optical interface or to the router interface for processing by routing logic, wherein the routing logic is operably coupled to the switching logic to selectively receive the optical data stream from the optical switching logic and retrieve routing information from the optical data stream, wherein the routing information is used to dynamically control the forwarding of subsequent incoming optical data streams transmitted at the given wavelength through the optical switch logic to the outgoing optical fiber for performing Open Shortest Path First (OSPF) forwarding.
36. The optical line card of claim 35 , wherein the optical switching logic comprises a demultiplexer operably coupled to demultiplex the incoming optical data stream from a number of incoming optical data streams received from the incoming optical fiber over the incoming optical interface.
37. The optical line card of claim 36 , wherein the optical switching logic further comprises an optical switch operably coupled to receive the incoming optical data stream from the demultiplexer and to selectively pass the incoming optical data stream through to the outgoing optical fiber over the outgoing optical interface or divert the incoming optical data stream over the router interface for processing by the routing logic.
38. The optical line card of claim 37 , wherein the optical switching logic further comprises an optical receiver operably coupled to receive the diverted incoming optical data stream from the optical switch and convert the diverted incoming optical data stream into incoming digitally formatted information for processing by the routing logic.
39. The optical line card of claim 38 , wherein the routing logic is operably coupled to receive the incoming digitally formatted information from the optical receiver and route the incoming digitally formatted information based upon a routing mechanism.
40. The optical line card of claim 36 , wherein the optical switch comprises an optical add/drop fabric.
41. The optical line card of claim 36 , wherein the optical switch comprises an optical drop-only fabric.
42. The optical line card of claim 35 , wherein the optical switching logic is operably coupled to receive outgoing digitally formatted information from the routing logic over the router interface and output an outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
43. The optical line card of claim 42 , wherein the optical switching logic comprises an optical transmitter operably coupled to receive the outgoing digitally formatted information from the routing logic over the router interface and produce the outgoing optical data stream from the digitally formatted information at a predetermined wavelength.
44. The optical line card of claim 43 , wherein the optical transmitter comprises a fixed wavelength laser for producing the outgoing optical data stream at the predetermined wavelength.
45. The optical line card of claim 43 , wherein the optical transmitter comprises a tunable laser tuned to produce the outgoing optical data stream at the predetermined wavelength.
46. The optical line card of claim 43 , wherein the optical switching logic further comprises:
an optical switch operably coupled to receive the outgoing optical data stream from the optical transmitter; and
a multiplexer operably coupled to receive the outgoing optical data stream from the optical switch and add the outgoing optical data stream to the outgoing optical fiber over the outgoing optical fiber over the outgoing optical interface.
47. The optical line card of claim 46 , wherein the optical switch comprises an optical add/drop fabric.
48. The optical line card of claim 43 , wherein the optical switching logic further comprises a combiner operably coupled to receive the outgoing optical data stream from the optical transmitter and add the outgoing optical data stream to the outgoing optical fiber over the outgoing optical interface.
49. The optical line card of claim 35 , wherein the incoming optical interface and the outgoing optical interface are on an optical physical card, and wherein the optical line card further comprises a physical card interface for coupling the optical switching logic to the incoming optical interface and the outgoing optical interface.