Optical transmission systems, devices, and methods
View Patent ↗An optical system with a first and second network tiers. The first network tier includes a plurality of major nodes optically interconnected by at least one transmission path. The second network tier includes a plurality of minor nodes disposed along the transmission path and the minor nodes are connected to at least one of the major nodes. The minor node is configured to transmit all traffic to an adjacent major node, and the major nodes are configured to transmit to and receive information from other major nodes and minor nodes on transmission paths connected to the major node.
1. An optical communications network comprising:
a first plurality of nodes optically interconnected by an optical communications path;
a second plurality of nodes disposed along the optical communications path, wherein:
each of the second plurality of nodes is connected to at least one of the first plurality of nodes via the optical communications path;
traffic between the first plurality of nodes travels through at least one of the second plurality of nodes without undergoing an optical-electrical-optical conversion;
each of the second plurality of nodes has a working path for traffic that includes at least one of the first plurality of nodes; and
the first plurality of nodes transmits to and receives information from nodes in both the first plurality of nodes and the second plurality of nodes; and
a third plurality of nodes optically interconnected by an optical communications path, wherein the first and third plurality of nodes have different hierarchical attributes, and wherein:
the second plurality of nodes are connected to at least one of the first plurality of nodes via the optical communications paths interconnecting the first and third plurality of nodes,
at least some traffic between the first and third plurality of nodes travels through the optical communications path and through at least one of the second plurality of nodes without undergoing an optical-electrical-optical conversion,
the second plurality of nodes are configured to transmit all traffic to an adjacent node in one of the first and third plurality of nodes via the optical communications path interconnecting the first and third plurality of nodes, wherein the adjacent node in the first and third plurality of nodes is part of a working path for the traffic from the second plurality of nodes, and
the first and third plurality of nodes are configured to transmit traffic to and receive traffic from other nodes in the first and third plurality of nodes and the second plurality of nodes on the optical communications path interconnecting the nodes in the first and third plurality of nodes.
2. The optical system of claim 1 , wherein the first and third plurality of nodes have different capacities.
3. The optical system of claim 1 , wherein the first and third plurality of nodes have different line rates.
4. The system of claim 1 , wherein the optical communications path is an optical fiber.
5. An optical communications network comprising:
a first plurality of nodes optically interconnected by an optical communications path;
a second plurality of nodes disposed along the optical communications path, wherein:
each of the second plurality of nodes is connected to at least one of the first plurality of nodes via the optical communications path;
traffic between the first plurality of nodes travels through at least one of the second plurality of nodes without undergoing an optical-electrical-optical conversion;
each of the second plurality of nodes has a working path for traffic that includes at least one of the first plurality of nodes; and
the first plurality of nodes transmits to and receives information from nodes in both the first plurality of nodes and the second plurality of nodes; and
a third plurality of nodes disposed along the optical communications paths, wherein the second plurality of nodes and third plurality of nodes have different hierarchical attributes, and wherein:
the second and third plurality of nodes are connected to at least one of the first plurality of nodes via the optical communications path interconnecting the first plurality of nodes,
at least some traffic between the first plurality of nodes travels through the optical communications path and through at least one of the second and third plurality of nodes without undergoing an optical-electrical-optical conversion,
the second and third plurality of nodes are configured to transmit all traffic to an adjacent node in the first plurality of nodes via the optical communications path interconnecting the first plurality of nodes, wherein the adjacent node in the first plurality of nodes is part of a working path for the traffic from the second and third plurality of nodes, and
the first plurality of nodes are configured to transmit traffic to and receive traffic from other nodes in the first plurality of nodes and the second and third plurality of nodes on the optical communications path interconnecting the first plurality of nodes.
6. The optical system of claim 5 , further comprising wavelengths transmitted along the optical communications paths between the nodes, wherein the second plurality of nodes reuses wavelengths and the third plurality of nodes does not reuse wavelengths.
7. A method for optically communicating in an optical network having a first plurality of nodes and a second plurality of nodes interconnected by an optical communications path, comprising:
receiving at one of the first plurality of nodes all traffic from one of the second plurality of nodes, wherein the traffic received at one of the first plurality of nodes from one of the second plurality of nodes traveled through the optical communications path interconnecting the first plurality of nodes, and wherein at least one of the first plurality of nodes is part of a working path for the traffic from the second plurality of nodes;
aggregating traffic received at one of the first plurality of nodes from one of the second plurality of nodes;
transmitting traffic from one of the first plurality of nodes to another of the first plurality of nodes, wherein at least some traffic transmitted between the node in the first plurality of nodes travels through the optical communications path and through at least one of the nodes in the second plurality of nodes without undergoing an optical-electrical-optical conversion;
providing a working path between a node in the second plurality of nodes and a first adjacent node in the first plurality of nodes; and
providing a protection path between a node in the second plurality of nodes and a second adjacent node in the first plurality of nodes.
8. The method of claim 7 , wherein the node in the first plurality of nodes and the node in the second plurality of nodes are adjacent to each other.
9. The method of claim 7 , wherein aggregating includes aggregating traffic into a plurality of signal channels based on traffic destination.
10. The method of claim 7 , wherein receiving includes receiving at the node in the first plurality of nodes traffic from a plurality of nodes in the second plurality of nodes.
11. The method of claim 10 , wherein aggregating includes aggregating traffic received at the node in the first plurality of nodes from a plurality of nodes in the second plurality of nodes.
12. The method of claim 7 , wherein transmitting includes transmitting at least one signal channel to another node in the first plurality of nodes.
13. The method of claim 7 , wherein transmitting includes transmitting at least one signal channel to a different node in the second plurality of nodes.
14. The method of claim 7 , further comprising:
receiving traffic at a node in the first plurality of nodes, wherein less than all of the traffic is destined for a node in the second plurality of nodes;
separating at the node in the first plurality of nodes the traffic destined for the node in the second plurality of nodes;
transmitting to the node in the second plurality of nodes the traffic destined for the node in the second plurality of nodes.
15. The method of claim 14 , wherein receiving includes receiving traffic from a node in the first plurality of nodes.
16. The method of claim 14 , wherein receiving includes receiving traffic from a node in the second plurality of nodes.
17. The method of claim 14 wherein:
separating includes separating traffic destined for a plurality of nodes in the second plurality of nodes; and
transmitting includes transmitting traffic to the plurality of nodes in the second plurality of nodes.
18. The system of claim 7 wherein the optical communications path is an optical fiber.