Scalable ROADM architecture with multi-plane switching
A node configured to operate in an optical network includes P switching planes interconnected by an S×S cross-plane switch, P>1; and N i degrees per switching plane P i where i=1 to P, each degree formed by corresponding degree components having R ports, wherein a first set of ports of the R ports is for intra-plane switching, a second set of ports of the R ports is for inter-plane switching, and a third set of ports of the R ports is for in-plane add/drop. S is greater than or equal to a sum of a number of degrees across all of the P switching planes. R is greater than or equal to a sum of the first set of ports, the second set of ports, and the third set of ports.
1. A Reconfigurable Optical Add/Drop Multiplexer (ROADM) node comprising:
P switching planes interconnected by an S×S cross-plane optical switch, P>1;
N i degrees per switching plane P i where i=1 to P, each degree formed by corresponding degree components having R ports for multiplexing or demultiplexing channels optically, wherein a first set of ports of the R ports is for intra-plane switching, a second set of ports of the R ports is for inter-plane switching, and a third set of ports of the R ports is for in-plane add/drop; and
one or more fiber shufflers configured to interconnect the P switching planes and the N i degrees.
2. The node of claim 1 , wherein S is greater than or equal to a sum of a number of degrees across all of the P switching planes.
3. The node of claim 1 , wherein R is greater than or equal to a sum of the first set of ports, the second set of ports, and the third set of ports.
4. The node of claim 1 , further comprising
D directions, wherein at least one direction has multiple degrees, and D≤N i .
5. The node of claim 1 , wherein the degree components include a route and select configuration with a first 1×R Wavelength Selective Switch (WSS) and a second R×1 WSS.
6. The node of claim 1 , wherein the degree components include a broadcast and select configuration with an R-way splitter and a R×1 Wavelength Selective Switch (WSS).
7. The node of claim 1 , wherein the degree components include a route and combine configuration with a 1×R Wavelength Selective Switch (WSS) and an R-way combiner.
8. The node of claim 1 , wherein the corresponding degree components include at least one open port for addition of a cross-plane switch for one or more of redundancy and additional inter-plane connectivity.
9. The node of claim 8 , wherein the addition is performable in-service.
10. A Reconfigurable Optical Add/Drop Multiplexer (ROADM) node configured to operate in an optical network with Space Division Multiplexing, the node comprising: P switching planes interconnected by an S×S cross-plane optical switch, P>1; D directions, wherein at least one direction has multiple degrees, and D s Ni; and Ni degrees per switching plane Pi where i=1 to P, each degree formed by corresponding degree components having R ports for multiplexing or demultiplexing channels optically, wherein a first set of ports of the R ports is for intra-plane switching, a second set of ports of the R ports is for inter-plane switching, and a third set of ports of the R ports is for in-plane add/drop; one or more fiber shufflers configured to interconnect the P switching planes and the N i degrees.
11. The node of claim 10 , wherein S is greater than or equal to a sum of a number of degrees across all of the P switching planes.
12. The node of claim 10 , wherein R is greater than or equal to a sum of the first set of ports, the second set of ports, and the third set of ports.
13. The node of claim 10 , wherein the degree components include a route and select configuration with a first 1×R Wavelength Selective Switch (WSS) and a second R×1 WSS.
14. The node of claim 10 , wherein the degree components include a broadcast and select configuration with an R-way splitter and a R×1 Wavelength Selective Switch (WSS).
15. The node of claim 10 , wherein the degree components include a route and combine configuration with a 1×R Wavelength Selective Switch (WSS) and an R-way combiner.
16. A Reconfigurable Optical Add/Drop Multiplexer (ROADM) node comprising:
P switching planes interconnected by an S×S cross-plane optical switch, P>1; and
N i degrees per switching plane P i where i=1 to P, each degree formed by corresponding degree components having R ports for multiplexing or demultiplexing channels optically, wherein a first set of ports of the R ports is for intra-plane switching, a second set of ports of the R ports is for inter-plane switching, and a third set of ports of the R ports is for in-plane add/drop,
wherein S is greater than or equal to a sum of a number of degrees across all of the P switching planes.
17. The node of claim 16 , wherein R is greater than or equal to a sum of the first set of ports, the second set of ports, and the third set of ports.
18. The node of claim 16 , further comprising
D directions, wherein at least one direction has multiple degrees, and D≤N i .
19. The node of claim 16 , wherein the corresponding degree components include at least one open port for addition of a cross-plane switch for one or more of redundancy and additional inter-plane connectivity.
20. The node of claim 16 , further comprising
one or more fiber shufflers configured to interconnect the P switching planes and the N i degrees.