Wavelength division multiplexing passive optical networks to transport access platforms

• US 20070019956A1
• Filed: 07/22/2005
• Published: 01/25/2007
• Est. Priority Date: 07/22/2005
• Status: Active Grant

• Current Assignee: Ericsson-Lg Company Limited (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Novera Optics, Inc. (Lg-Nortel Company Limited)
• Inventors: Hesse, Bernd, Sorin, Wayne
• Granted Patent: US 7,627,246 B2
• Time in Patent Office: Days
• US Class Current: 398/71
• CPC Class Codes: H04J 14/0226 Fixed carrier allocation, e.g. according to service
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0246 using one wavelength per ONU
• CPC Class Codes: H04J 14/0247 Sharing one wavelength for at least a group of ONUs
• CPC Class Codes: H04J 14/025 using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
• CPC Class Codes: H04J 14/0252 Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
• CPC Class Codes: H04J 14/0282 WDM tree architectures
• CPC Class Codes: H04J 2014/0253 Allocation of downstream wavelengths for upstream transmission

Abstract

Wavelength division multiplexing (“WDM”) passive optical networks (“PON”) to transport signals having various access platforms are described. For one embodiment, a WDM PON performs bi-directional communications, and includes an interface. The interface transfers one or more signals having a first platform to a WDM-PON data transmission platform at an access point of a network to propagate through a single transmission medium, to one or more remote distribution nodes in between a Central Office and an optical network unit. The single transmission medium carriers three or more optical channels traveling in both directions.

Claims

1. A wavelength division multiplexing passive optical network (WDM-PON) for performing bi-directional communication, the WDM-PON comprising:

a first interface to transfer one or more signals having a first platform to a WDM-PON data transmission platform at an access point and to propagate signals in the WDM-PON transmission platform through a transmission medium; and

one or more remote distribution nodes in between a Central Office and an optical network unit, wherein the transmission medium to carry three or more optical channels traveling in a first direction.

2. The WDM-PON of claim 1, wherein the first interface includes three or more wavelength locked optical transmitters.

3. The WDM-PON of claim 1, wherein the access point is the Central Office.

4. The WDM-PON of claim 1 further comprising:

a second interface coupled to the first interface, wherein the second interface transfers the WDM-PON data transmission platform at a distribution point back into the first platform of the set of one or more signals.

5. The WDM-PON of claim 1, wherein the first interface maintains a data sequence of the set of one or more signals by examining the data in a first signal of the set of one or more signals and data modulating that information onto a first wavelength transmitted in the WDM-PON.

25. The WDM-PON of claim 1, wherein the optical spacing between optical channels is less than 10 nm.

6. A WDM PON system, comprising:

a Central Office and a remote node;

a first interface coupled to the Central Office to input a first set of one or more signals having a first platform and to output a second set of one or more signals to propagate through an optical transmission medium using a WDM platform, wherein the first interface includes one or more wavelength locked transmitters; and

a second interface coupled to the remote node, the second interface to input the second set of one or more signals from the optical transmission medium and to output a third set of one or more signals, wherein the third set of one or more signals has the first platform.

7. The system of claim 6, wherein the second set of one or more signals preserves the sequence of the data in the first set of signals.

8. The system of claim 6, wherein the first platform is an access platform.

9. The system of claim 6, wherein the first interface is located at a Central Office and the second interface is located at the remote node.

10. The system of claim 6, wherein the optical spacing between signals of the second set is less than 10 nm.

11. The system of claim 6, wherein the second set of one or more signals has an adjustable data transmission rate.

12. The system of claim 6, wherein the first set of one or more signals is in an electrical format.

13. An apparatus, comprising:

a line terminal having an input to receive an access platform set of signals, and a converter to output a wavelength division multiplexing (“

WDM”

) set of signals to propagate through an optical transmission medium to a remote node, wherein the line terminal also contains one or more wavelength locked optical transmitters.

14. The apparatus of claim 13, further comprising

one or more optical network units coupled to the remote node, the one or more optical network units to input the WDM set of signals and to output the access platform set of signals.

15. The apparatus of claim 13, wherein the spacing between the WDM set of signals is less than 10 nm.

16. The apparatus of claim 13, wherein the line terminal further includes one or more monitors.

17. The apparatus of claim 13, further comprising:

an optical multiplexer/demultiplexer coupled to the one or more remote optical network units to multiplex/demultiplex WDM set of signals propagating through the optical transmission medium.

18. A WDM PON fiber plant, comprising:

one or more converters having an input to receive a first set of one or more signals having an access platform and an output to output a second set of one or more signals to propagate through an optical transmission medium in compliance with a WDM platform; and

an arrayed waveguide multiplexer/demultiplexer coupled to the one or more converters.

19. The WPON fiber plant of claim 18, wherein the second set of one or more signals preserves a sequence of data from the access platform of the first set of one or more signals.

20. The fiber plant of claim 18, wherein the one or more converters include a wavelength locked light source.

22. The method of claim 20, wherein the outputting the second set of one or more signals comprises maintaining a sequence of the data in the platform of the first set of signals.

23. The method of claim 20, wherein the first platform is an access platform.

24. The method of claim 20, wherein the outputting the second set of one or more signals comprises outputting a wavelength locked signal.

21. A method, comprising:

inputting a first set of one or more signals having a first platform;

outputting a second set of one or more signals to propagate through a single optical transmission medium using a WDM transmission platform;

inputting the second set of one or more signals from the single optical transmission medium; and

outputting a third set of one or more signals, wherein the third set of one or more signals has the platform of the first set of one or more signals.