Flexible interconnection of scalable systems integrated using optical networks for datacenters

• US 9,742,518 B2
• Filed: 10/01/2013
• Issued: 08/22/2017
• Est. Priority Date: 06/10/2013
• Status: Active Grant

• Current Assignee: Indian Institute of Technology Bombay
• Original Assignee: Indian Institute of Technology Bombay
• Inventors: Gumaste, Ashwin, Bheri, Bala Murali Krishna
• Primary Examiner(s): Vanderpuye, Ken N
• Assistant Examiner(s): SANCHEZ, DIBSON J
• Application Number:
  US14/043,844
• Publication Number:
  US 20140363160A1
• Time in Patent Office: 1,421 Days
• Field of Search: 398 48, 398 58- 59, 398 79, 398 82- 88
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0213 Groups of channels or wave bands arrangements
• CPC Class Codes: H04J 14/0269 using tables for routing
• CPC Class Codes: H04J 14/0283 WDM ring architectures
• CPC Class Codes: H04J 14/029 Dedicated protection at the optical multiplex section (1+1)
• CPC Class Codes: H04J 14/0298 with sub-carrier multiplexing [SCM]
• CPC Class Codes: H04L 45/48 Routing tree calculation

Abstract

A network capable of being used in a datacenter is described. In some embodiments, the network can comprise a set of optical fiber rings, wherein each optical fiber ring carries data traffic on one or more wavelengths, and wherein each optical fiber ring is partitioned into multiple sectors. A reconfigurable optical add-drop multiplexer (ROADM) can be coupled to at least one optical fiber in each of at least two sectors. An electro-optical-switch can be coupled to each ROADM in each of the at least two sectors. A set of switches can be coupled to each electro-optical-switch in each of the at least two sectors. The set of switches can comprise a first layer of aggregation switches that is coupled to a second layer of edge switches, wherein the edge switches can be coupled to servers in a datacenter.

Claims

1. A network, comprising:

a set of optical fiber rings, wherein each optical fiber ring carries data traffic on one or more wavelengths, and wherein each optical fiber ring is partitioned into multiple sectors; and

wherein each sector in the multiple sectors comprises;

a single add-wavelength-selectable-switch (add-WSS) to transmit data traffic to other sectors, wherein the single add-WSS is coupled via a passive optical coupler to a single optical fiber ring in the set of optical fiber rings, thereby combining an optical signal in the single optical fiber ring with an optical signal from the add-WSS, wherein the single add-WSS is coupled to an electro-optical switch (EOS), and wherein the EOS is coupled to an electrical switch; and

a set of drop-wavelength-selectable switches (drop-WSSs) to receive data from other sectors, wherein each drop-WSSs in the set of drop-WSSs is coupled via a passive optical coupler to a corresponding optical fiber ring in the set of optical fiber rings, thereby splitting an optical signal in the corresponding optical fiber ring into two parts and providing one of the two parts to the drop-WSS, wherein each drop-WSS is coupled to a corresponding EOS in a set of electro-optical switches (EOSs), and the set of EOSs is coupled to a set of electrical switches.

2. The network of claim 1, wherein the set of electrical switches comprises a first layer of aggregation switches that is coupled to a second layer of edge switches.

3. The network of claim 2, wherein the edge switches are coupled to servers.

4. The network of claim 1, wherein the set of optical fiber rings comprises clockwise optical fiber rings and counter-clockwise optical fiber rings, wherein the set of optical fiber rings are configured to perform protection switching upon detecting a failure.

5. The network of claim 1, wherein packets are routed within the network based on a binary tree, wherein the binary tree includes a virtual root node, a set of dummy nodes, and a set of physical nodes, wherein each switch in the set of switches corresponds to a physical node in the binary tree.

6. The network of claim 1, wherein at least one sector includes one or more gateway switches that are coupled to an external network.

7. The network of claim 1, wherein the network is capable of being incrementally scaled by adding more sectors.

8. A datacenter, comprising:

a set of servers;

a network to enable communication between the set of servers, the network comprising;

a set of optical fiber rings, wherein each optical fiber ring carries data traffic on one or more wavelengths, and wherein each optical fiber ring is partitioned into multiple sectors; and

wherein each sector in the multiple sectors comprises;

a single add-wavelength-selectable-switch (add-WSS) to transmit data traffic to other sectors, wherein the single add-WSS is coupled via a passive optical coupler to a single optical fiber ring in the set of optical fiber rings, thereby combining an optical signal in the single optical fiber ring with an optical signal from the add-WSS, wherein the single add-WSS is coupled to an electro-optical switch (EOS), and wherein the EOS is coupled to an electrical switch; and

a set of drop-wavelength-selectable-switches (drop-WSSs) to receive data from other sectors, wherein each drop-WSSs in the set of drop-WSSs is coupled via a passive optical coupler to a corresponding optical fiber ring in the set of optical fiber rings, thereby splitting an optical signal in the corresponding optical fiber ring into two parts and providing one of the two parts to the drop-WSS, wherein each drop-WSS is coupled to a corresponding EOS in a set of electro-optical switches (EOSs), and the set of EOSs is coupled to a set of electrical switches.

9. The datacenter of claim 8, wherein the set of optical fiber rings comprises clockwise optical fiber rings and counter-clockwise optical fiber rings, wherein the set of optical fiber rings are configured to perform protection switching upon detecting a failure.

10. The datacenter of claim 8, wherein packets are routed within the network based on a binary tree, wherein the binary tree includes a virtual root node, a set of dummy nodes, and a set of physical nodes, wherein each switch in the set of switches corresponds to a physical node in the binary tree.

11. The datacenter of claim 8, wherein at least one sector includes one or more gateway switches that are coupled to an external network.

12. The datacenter of claim 8, wherein the network is capable of being incrementally scaled by adding more sectors.

13. An optical network that communicatively interconnects a set of servers, the optical network comprising:

a set of optical fiber rings, wherein each optical fiber ring carries data traffic on one or more wavelengths, wherein the set of optical fiber rings comprises clockwise optical fiber rings and counter-clockwise optical fiber rings, wherein the set of optical fiber rings are configured to perform protection switching upon detecting a failure, and wherein each optical fiber ring is partitioned into multiple sectors;

wherein each sector in the multiple sectors comprises;

a single add-wavelength-selectable-switch (add-WSS) to transmit data traffic to other sectors, wherein the single add-WSS is coupled via a passive optical coupler to a single optical fiber ring in the set of optical fiber rings, thereby combining an optical signal in the single optical fiber ring with an optical signal from the add-WSS, wherein the single add-WSS is coupled to an electro-optical switch (EOS), and wherein the EOS is coupled to an electrical switch; and

a set of drop-wavelength-selectable-switches (drop-WSSs) to receive data from other sectors, wherein each drop-WSSs in the set of drop-WSSs is coupled via a passive optical coupler to a corresponding optical fiber ring in the set of optical fiber rings, thereby splitting an optical signal in the corresponding optical fiber ring into two parts and providing one of the two parts to the drop-WSS, wherein each drop-WSS is coupled to a corresponding EOS in a set of electro-optical switches (EOSs), and the set of EOSs is coupled to a set of electrical switches; and

wherein packets are routed within the optical network based on a binary tree, wherein the binary tree includes a virtual root node, a set of dummy nodes, and a set of physical nodes, and wherein each electrical switch corresponds to a physical node in the binary tree.

14. The optical network of claim 13, wherein at least one sector includes one or more gateway switches that are coupled to an external network.

15. The optical network of claim 13, wherein the optical network is capable of being incrementally scaled by adding more sectors.