Methods and apparatus for communicating dynamic optical wavebands (DOWBs)

• US 8,086,103 B2
• Filed: 04/29/2004
• Issued: 12/27/2011
• Est. Priority Date: 04/29/2004
• Status: Active Grant

• Current Assignee: LGS Innovations LLC (CACI International Incorporated)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Beacken, Marc J., Imbesi, Dominick J.
• Primary Examiner(s): Leung, Danny
• Application Number:
  US10/835,086
• Publication Number:
  US 20050244157A1
• Time in Patent Office: 2,798 Days
• Field of Search: 398 45- 57, 398/75, 398 69- 73, 398/95, 398/66
• US Class Current: 398/69
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 2011/0064 Arbitration, scheduling or medium access control aspects
• CPC Class Codes: H04Q 2011/0075 Wavelength grouping or hierarchical aspects

Abstract

Dynamic optical wavebands are disclosed that allow a plurality of user streams having a common destination node to be positioned in a substantially adjacent non-overlapping manner on a spectrum for treatment as a routable entity. Each waveband has an associated center wavelength and spectral extent. The plurality of user streams can optionally be encrypted using a corresponding cipher. Wavebands that are received by a network node are filtered so that individual wavebands can be isolated, if necessary. For example, individual wavebands can be switched to an appropriate output node for forwarding in the optical network. In addition, the center wavelength and spectral extent of a waveband can be converted, if necessary, to position the waveband substantially spectrally adjacent to another waveband sharing a common path portion. In this manner, the substantially spectrally adjacent wavebands can be treated as an aggregated waveband for the common portion of a path. The disclosed wavebands can be processed only as an optical signal. The center wavelength, spectral extent and routing information associated with each waveband can optionally be processed as out-of-band signals.

Claims

1. A method performed by a node in an optical network, comprising:

receiving a plurality of user streams having a common destination node, wherein said plurality of user streams have respective spectral extents that are independently variable, wherein said destination node is distinct from said node; and

positioning said plurality of user streams in a substantially adjacent non-overlapping manner on a spectrum to form a waveband, wherein said waveband has an associated variable center wavelength and variable spectral extent and can be routed as an entity to a next node in said optical network, wherein said variable center wavelength and said variable spectral extent are not based on fixed wavelength grid intervals.

2. The method of claim 1, further comprising the step of modifying said associated center wavelength based on routing information for said waveband.

3. The method of claim 1, wherein said waveband is processed only as an optical signal.

4. The method of claim 1, wherein routing information associated with said waveband is processed as an out-of-band signal.

5. The method of claim 1, wherein said center wavelength and spectral extent associated with said waveband are processed as an out-of-band signal.

6. The method of claim 1, further comprising the step of switching said waveband to an appropriate output port based on associated routing information.

7. The method of claim 1, further comprising the step of encrypting each of said plurality of user streams using a corresponding cipher.

27. The method of claim 1, further comprising the step of filtering a received signal to select one or more of said wavebands based on a tuning of at least one of said associated variable center wavelength and variable spectral extent.

8. A node in an optical network, comprising:

a plurality of input ports for receiving a plurality of user streams having a common destination node, wherein said plurality of user streams have respective spectral extents that are independently variable, wherein said destination node is distinct from said node; and

one or more wavelength converters for positioning said plurality of user streams in a substantially adjacent non-overlapping manner on a spectrum to form a waveband, wherein said waveband has an associated variable center wavelength and variable spectral extent and can be routed as an entity to a next node in said optical network, wherein said variable center wavelength and said variable spectral extent are not based on fixed wavelength grid intervals.

9. The node of claim 8, wherein said one or more wavelength converters is further configured to modify said associated center wavelength based on routing information for said waveband.

10. The node of claim 8, wherein said waveband is processed only as an optical signal.

11. The node of claim 8, wherein routing information associated with said waveband is processed as an out-of-band signal.

12. The node of claim 8, wherein said center wavelength and spectral extent associated with said waveband are processed as an out-of-band signal.

13. The node of claim 8, further comprising a steering stage to switch said waveband to an appropriate output port based on associated routing information.

14. The node of claim 8, further comprising an encryption stage to encrypt each of said plurality of user streams using a corresponding cipher.

28. The node of claim 8, further comprising one or more filters for filtering a received signal to select one or more of said wavebands based on a tuning of at least one of said associated variable center wavelength and variable spectral extent.

15. A method performed by a node in an optical network, comprising:

filtering one or more received wavebands, each of said one or more received wavebands having a variable center wavelength and variable spectral extent and wherein said one or more received wavebands are comprised of a plurality of user streams having a common destination node and respective spectral extents that are independently variable, wherein said variable center wavelength and said variable spectral extent are not based on fixed wavelength grid intervals, wherein said destination node is distinct from said node;

switching each of said one or more received wavebands to an appropriate output node for forwarding in said optical network.

16. The method of claim 15, further comprising the step of converting said center wavelength and spectral extent of at least one received waveband to position said at least one received waveband substantially spectrally adjacent to another waveband sharing a common path portion.

17. The method of claim 15, wherein said one or more received wavebands is processed only as an optical signal.

18. The method of claim 15, wherein routing information associated with each of said one or more received wavebands is processed as an out-of-band signal.

19. The method of claim 15, wherein said center wavelength and spectral extent associated with each of said one or more received wavebands are processed as an out-of-band signal.

20. The method of claim 15, wherein at least one of said one or more received wavebands is an aggregation of wavebands sharing a common path portion.

29. The method of claim 15, further comprising the step of filtering a received signal to select one or more of said wavebands based on a tuning of at least one of said associated variable center wavelength and variable spectral extent.

21. A node in an optical network, comprising:

one or more filters for separating a plurality of wavebands received on the same port, each of said wavebands having a variable center wavelength and variable spectral extent and wherein said one or more received wavebands are comprised of a plurality of user streams having a common destination node and respective spectral extents that are independently variable, wherein said variable center wavelength and said variable spectral extent are not based on fixed wavelength grid intervals, wherein said destination node is distinct from said node;

a steering section to provide said wavebands to an appropriate output node for forwarding in said optical network.

22. The node of claim 21, further comprising a wavelength converter for converting said center wavelength and spectral extent of at least one waveband to position said at least one waveband substantially spectrally adjacent to another waveband sharing a common path portion.

23. The node of claim 21, wherein said waveband is an aggregation of wavebands sharing a common path portion.

24. The node of claim 21, wherein each of said plurality of wavebands is processed only as an optical signal.

25. The node of claim 21, wherein routing information associated with each of said plurality of wavebands is processed as an out-of-band signal.

26. The node of claim 21, wherein said center wavelength and spectral extent associated with each of said plurality of wavebands is processed as an out-of-band signal.