FLEXIBLE INTERCONNECTION OF SCALABLE SYSTEMS INTEGRATED USING OPTICAL NETWORKS FOR DATACENTERS

• US 20140363160A1
• Filed: 10/01/2013
• Published: 12/11/2014
• Est. Priority Date: 06/10/2013
• Status: Active Grant

• Current Assignee: Indian Institute of Technology Bombay
• Original Assignee: Indian Institute of Technology Delhi
• Inventors: Gumaste, Ashwin, Bheri, Bala Murali Krishna
• Granted Patent: US 9,742,518 B2
• Time in Patent Office: Days
• US Class Current: 398/48
• 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;

a reconfigurable optical add-drop multiplexer (ROADM) coupled to at least one optical fiber in each of at least two sectors;

an electro-optical-switch coupled to each ROADM in each of the at least two sectors; and

a set of switches coupled to each electro-optical-switch in each of the at least two sectors.

2. The network of claim 1, wherein the set of 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. 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;

a reconfigurable optical add-drop multiplexer (ROADM) coupled to at least one optical fiber in each of at least two sectors;

an electro-optical-switch coupled to each ROADM in each of the at least two sectors; and

a set of switches coupled to each electro-optical-switch in each of the at least two sectors, wherein at least a subset of the set of switches is coupled to the set of servers.

8. The datacenter of claim 7, 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.

9. The datacenter of claim 7, 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.

10. The datacenter of claim 7, wherein at least one sector includes one or more gateway switches that are coupled to an external network.

11. A method for switching packets in a datacenter network having an optical backplane, the method comprising:

a first switch receiving a packet, wherein the first switch is in a first sector of the optical backplane;

routing the packet from the first switch to a second switch in the first sector of the optical backplane;

the second switch inserting a wavelength tag into the packet;

routing the packet from the second switch to a third switch over the optical backplane, wherein the third switch is in a second sector of the optical backplane;

the third switch inserting a source-address tag, an aggregation switch tag, and a destination edge tag into the packet; and

routing the packet from the third switch to a fourth switch in the second sector of the optical backplane.