Systems and methods for the integration of framing, OAM&P, and forward error correction in pluggable optical transceiver devices

• US 20080089693A1
• Filed: 10/13/2006
• Published: 04/17/2008
• Est. Priority Date: 10/13/2006
• Status: Active Grant

• Current Assignee: Lumentum Operations, LLC (Lumentum Holdings Inc.)
• Original Assignee: Menara Networks Incorporated (Lumentum Holdings Inc.)
• Inventors: Cardona, Gabriel E., Hotchkiss, Adam R., El-Ahmadi, Salam, El-Ahmadi, Siraj Nour
• Granted Patent: US 7,580,637 B2
• Time in Patent Office: Days
• US Class Current: 398/135
• CPC Class Codes: H04J 2203/006 Fault tolerance and recovery
• CPC Class Codes: H04J 2203/0085 Support of Ethernet
• CPC Class Codes: H04J 3/047 Distributors with transistors or integrated circuits
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence

Abstract

The present invention provides integrated framing in pluggable optical transceivers to extend the OTN framework into metro, regional, and core applications. Additionally, the present invention provides integrated FEC and optical layer OAM&P features into pluggable optical transceivers. This integration is done with existing pluggable transceivers defined by MSAs such as, but not limited to, XFP, XPAK, XENPAK, X2, XFP-E, and SFP+. Further, the present invention can be extended to new, emerging pluggable transceiver standards and specifications. The integration of framing, FEC, and optical layer OAM&P is done so that the pluggable transceiver preserves the specifications in the MSAs. This allows systems designed for existing pluggable transceivers to realize carrier-grade, robust performance without needed additional equipment such as transponders and without redesigning host equipment such as the line card to support new specifications.

Claims

1. A pluggable optical transceiver defined by a multi-source agreement, the pluggable optical transceiver comprising

integrated circuitry configured to frame a signal with overhead for operations, administration, maintenance, &

provisioning (OAM&

P) functions necessary for optical transport networks (OTN) applications;

wherein the pluggable optical transceiver with the integrated circuitry preserves the specifications for the multi-source agreement defining the pluggable optical transceiver.

2. The pluggable optical transceiver of claim 1, wherein the integrated circuitry is configured to frame the signal with a G.709 frame and the overhead comprises G.709 management data.

3. The pluggable optical transceiver of claim 2, wherein the G.709 management data is either passed entirely to a host system or a subset of the G.709 management overhead is accessible and terminated on the pluggable optical transceiver;

and

wherein the G.709 management data is communicated through mechanisms fully supported by the multi-source agreement without requiring hardware re-design in the host system.

4. The pluggable optical transceiver of claim 3, wherein the pluggable optical transceiver is utilized in any of Internet Protocol over wavelength division multiplexing, asynchronous transfer mode over wavelength division multiplexing, Ethernet over wavelength division multiplexing, frame relay over wavelength division multiplexing, and fiber channel over wavelength division multiplexing applications.

5. The pluggable optical transceiver of claim 3, wherein the pluggable optical transceiver is utilized in high-density, input-output applications.

6. The pluggable optical transceiver of claim 3, wherein the pluggable optical transceiver is utilized in G.709 interconnection applications.

7. The pluggable optical transceiver of claim 3, wherein the pluggable optical transceiver is utilized in applications requiring comprehensive operations, administration, maintenance, &

provisioning support.

8. The pluggable optical transceiver of claim 1, wherein the overhead in the overhead comprises forward error correction overhead for performance enhancement and reach extension and the integrated circuitry is configured to correct errors in an optical signal utilizing the forward error correction overhead.

9. The pluggable optical transceiver of claim 8, wherein the integrated circuitry is configured to provide real-time monitoring of an optical link and historical bit-error rate data based on the correction of errors with the forward error correction overhead.

10. The pluggable optical transceiver of claim 1, wherein the multi-source agreement comprises any of XFP, XPAK, XENPAK, X2, XFP-E, and SFP+.

11. A pluggable optical transceiver defined by a multi-source agreement, the pluggable optical transceiver comprising:

integrated forward error correction circuitry, the circuitry is configured to add forward error correction overhead to a transmitted signal and to process forward error correction overhead on a received signal to correct errors;

wherein the pluggable optical transceiver with the integrated forward error correction circuitry preserves the specifications for the multi-source agreement defining the pluggable optical transceiver.

12. The pluggable optical transceiver of claim 11, wherein the forward error correction circuitry is configured to frame the optical signal with a G.709 frame, the G.709 frame comprises overhead for operations, administration, maintenance, &

provisioning overhead and the forward error correction overhead.

13. The pluggable optical transceiver of claim 12, wherein the pluggable optical transceiver is utilized in any of Internet Protocol over wavelength division multiplexing, asynchronous transfer mode over wavelength division multiplexing, Ethernet over wavelength division multiplexing, frame relay over wavelength division multiplexing, and fiber channel over wavelength division multiplexing applications.

14. The pluggable optical transceiver of claim 12, wherein the pluggable optical transceiver is utilized in high-density, input-output applications.

15. The pluggable optical transceiver of claim 12, wherein the pluggable optical transceiver is utilized in G.709 interconnection applications.

16. The pluggable optical transceiver of claim 12, wherein the pluggable optical transceiver is utilized in applications requiring comprehensive operations, administration, maintenance, &

provisioning support.

17. The pluggable optical transceiver of claim 11, wherein the multi-source agreement comprises any of XFP, XPAK, XENPAK, X2, XFP-E, and SFP+.

18. A pluggable optical transceiver defined by one of the XPAK, XENPAK, or X2 multi-source agreements, the pluggable optical transceiver comprising:

G.709 framing circuitry integrated into the pluggable optical transceiver, the G.709 framing circuitry is configured to;

frame an incoming signal with a G.709 frame comprising G.709 management overhead and forward error correction overhead and provide the signal in the G.709 frame to an optical transmitter;

un-frame an incoming G.709 signal from an optical receiver and provide the unframed signal to a XAUI-XFI transceiver; and

process G.709 management overhead and forward error correction overhead on the incoming G.709 signal;

wherein the pluggable optical transceiver integrated with the framing circuitry preserves one of the XPAK, XENPAK, or X2 specifications.

19. The pluggable optical transceiver of claim 18, wherein the G.709 framing circuitry is further configured to:

terminate a subset of the G.709 management overhead and pass the terminated overhead to a host system through mechanisms supported by one of the XPAK, XENPAK, or X2 specifications; and

correct errors responsive to the forward error correction overhead and pass corrected error statistics to the host system through mechanisms supported by one of the XPAK, XENPAK, or X2 specifications.

20. The pluggable optical transceiver of claim 19, wherein the subset of G.709 management overhead and the forward error correction overhead are passed to the host system through a management data input/output interface.

21. The pluggable optical transceiver of claim 20, wherein the management data input/output interface utilizes unused registers to pass the subset of G.709 management overhead and the forward error correction overhead to the host system.

22. The pluggable optical transceiver of claim 20, wherein a field programmable gate assembly bridges the management data input/output between the XAUI-XFI transceiver and the G.709 framing circuitry to provide a single, MSA-compliant management data input/output to the host system.

23. The pluggable optical transceiver of claim 18, wherein the G.709 framing circuitry is further configured to:

pass the entire G.709 management overhead to a host system through mechanisms supported by one of the XPAK, XENPAK, or X2 specifications; and

correct errors responsive to the forward error correction overhead and pass corrected error statistics to the host system through mechanisms supported by one of the XPAK, XENPAK, or X2 specifications.

24. The pluggable optical transceiver of claim 18, wherein the G.709 framing circuitry is integrated into the XAUI-XFI transceiver, the XAUI-XFI transceiver comprises an application specific integrated circuit.

25. A pluggable optical transceiver defined by one of the XFP, XFP-E, or SFP+ multi-source agreements, the pluggable optical transceiver comprising:

G.709 framing circuitry integrated into the pluggable optical transceiver, the G.709 framing circuitry is configured to;

frame an incoming signal with a G.709 frame comprising G.709 management overhead and forward error correction overhead and provide the signal in the G.709 frame to an optical transmitter;

un-frame an incoming G.709 signal from an optical receiver and provide the unframed signal to a host system; and

process G.709 management overhead and forward error correction overhead on the incoming G.709 signal;

wherein the pluggable optical transceiver integrated with the framing circuitry preserves the XFP, XFP-E, or SFP+ specifications.

26. A method for designing a multi-source agreement pluggable transceiver for optical transport network applications, the method comprising:

determining the mechanical characteristics, management interfaces, electrical characteristics, optical characteristics, and thermal requirements of the multi-source agreement; and

incorporating integrated framing within the multi-source agreement pluggable transceiver;

wherein the incorporating step preserves the mechanical characteristics, management interfaces, electrical characteristics, optical characteristics, and thermal requirements of the multi-source agreement.

27. The method of claim 26, further comprising the step of:

incorporating operations, administration, maintenance, &

provisioning (OAM&

P) functions necessary for metro, regional, and core applications within the multi-source agreement pluggable transceiver;

wherein the incorporating OAM&

P step preserves the mechanical characteristics, management interfaces, electrical characteristics, optical characteristics, and thermal requirements of the multi-source agreement.

28. The method of claim 26, further comprising the step of:

incorporating forward error correction for performance enhancement and reach extension within the multi-source agreement pluggable transceiver, the forward error correction is configured to correct errors in an optical signal;

wherein the incorporating forward error correction step preserves the mechanical characteristics, management interfaces, electrical characteristics, optical characteristics, and thermal requirements of the multi-source agreement.

29. The method of claim 26, further comprising the steps of:

incorporating operations, administration, maintenance, &

provisioning (OAM&

P) functions necessary for metro, regional, and core applications within the multi-source agreement pluggable transceiver;

incorporating forward error correction for performance enhancement and reach extension within the multi-source agreement pluggable transceiver, the forward error correction is configured to correct errors in an optical signal;

wherein the incorporating OAM&

P and forward error correction steps preserve the mechanical characteristics, management interfaces, electrical characteristics, optical characteristics, and thermal requirements of the multi-source agreement.