Bidirectional optical data packet switching interconection network

• US 9,031,407 B2
• Filed: 12/26/2012
• Issued: 05/12/2015
• Est. Priority Date: 12/27/2011
• Status: Active Grant

• Current Assignee: Indian Institute of Technology Delhi
• Original Assignee: Indian Institute of Technology Delhi
• Inventors: Chandra, Vinod, Chadha, Devi, Sangeetha, R. G.
• Primary Examiner(s): TRAN, DZUNG D
• Application Number:
  US13/727,002
• Publication Number:
  US 20130209102A1
• Time in Patent Office: 867 Days
• Field of Search: 398 45- 48, 398/51, 398/54
• US Class Current: 398/51
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0265 Multiplex arrangements in bidirectional systems, e.g. interleaved allocation of wavelengths or allocation of wavelength groups
• CPC Class Codes: H04J 14/0267 Optical signaling or routing
• CPC Class Codes: H04J 14/0273 using optical overhead, e.g. overhead processing
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 11/0066 Provisions for optical burst or packet networks
• CPC Class Codes: H04Q 2011/0073 Provisions for forwarding or routing, e.g. lookup tables
• CPC Class Codes: H04Q 2011/009 Topology aspects

Abstract

The present disclosure discloses data vortex architecture with bidirectional links in which the packets are routed both in forward as well as in reverse directions through a single node. The disclosed arrangement avoids any packet congestion in the network and improves the BER characteristics.

Claims

1. A bidirectional optical packet switching interconnection network, said network comprising:

one or more optical switching nodes with bidirectional links, each of which comprises forward input and reverse output optical data packet flow ports and reverse input and forward output optical data packet flow ports;

a switching unit operatively coupled to said optical switching nodes to route said optical data packet flow both in forward and reverse direction; and

an electronic processing unit operatively coupled to said optical switching nodes and said switching unit to execute the routing of the optical data packets both in forward and reverse directions based on extracted control signals, wherein, when a node of said optical switching nodes is sent two of said optical data packets in the same time slot, the node is configured to delay one of said optical data packets by one time slot.

2. The network as claimed in claim 1, wherein said switching unit comprises:

a plurality of optical switches;

one or more couplers; and

one or more semiconductor optical amplifiers (SOAs) that execute the routing and compensate for coupling losses.

3. The network as claimed in claim 1, wherein said electronic processing unit comprises:

a detection unit that detects the isolated control wavelengths; and

a signal extraction unit that controls and process the signals switching based on the extracted wavelength of frame and header information of the data.

4. The network as claimed in claim 3, wherein said switching prioritizes the optical packets moving on the same cylinder over the packets moving to the adjacent cylinder.

5. The network as claimed in claim 3, wherein said extracted wavelength of the frame bit indicates the desired data flow direction.

6. The network as claimed in claim 1, wherein said bidirectional link comprises two optical fibers connecting nodes to carry the packets both in the forward and in the reverse directions.

7. The network as claimed in claim 6, wherein said optical fibers comprise one cylinder to the adjacent cylinder to reach its destination.

8. The network as claimed in claim 1, wherein said optical data packets are sent through the node only in one direction, in one time slot.

9. The network as claimed in claim 1, wherein said optical data packets are allowed on all ports, on detection of said frame bit only in one direction.

10. The network as claimed in claim 1, wherein said optical data packets comprising header bits are allowed in one direction and the packet is delayed for one time slot in another direction, on detection of said frame bit in both the directions.

11. The network as claimed in claim 1, wherein said packets from both the forward and reverse directions are not allowed to enter simultaneously at a particular time slot.

12. A method for bidirectional optical packet switching, said method comprising:

providing one or more optical switching nodes with bidirectional links, each of which comprises forward input and reverse output optical data packet flow ports and reverse input and forward output optical data packet flow ports;

selecting the switching direction to route said optical data packet flow both in forward and reverse direction; and

executing the routing of the optical data packets both in forward and reverse directions based on extracted control signals, wherein, when a node of said optical switching nodes is sent two of said optical data packets in the same time slot, the node is configured to delay one of said optical data packets by one time slot.

13. The method as claimed in claim 12, wherein said bidirectional links comprises two optical fibers connecting nodes to carry the packets both in the forward and in the reverse directions.

14. The method as claimed in claim 13, wherein said optical fibers comprise one cylinder to the adjacent cylinder to reach its destination.

15. The method as claimed in claim 12, wherein said optical data packets are sent through the node only in one direction, in one time slot.

16. The network as claimed in claim 12, wherein said switching prioritizes the optical packets moving on the same cylinder over the packets moving to the adjacent cylinder.

17. The method as claimed in claim 12, wherein said switching is based on the extracted wavelength of frame and header information of the data.

18. The method as claimed in claim 17, wherein said extracted wavelength of the frame bit indicates the desired data flow direction.

19. The method as claimed in claim 12, wherein said optical data packets are allowed on all ports, on detection of said frame bit only in one direction.

20. The method as claimed in claim 12, wherein said optical data packets comprising header bits are allowed in one direction and the packet is delayed for one time slot in another direction, on detection of said frame bit in both the directions.

21. The method as claimed in claim 12, wherein said packets from both the forward and reverse directions are not allowed to enter simultaneously at a particular time slot.