Optimized colorless, directionless, and contentionless ROADM in a module
A Reconfigurable Optical Add/Drop Multiplexer (ROADM) node with a Colorless, Directionless, and Contentionless (CDC) architecture, targeting smaller degree nodes, includes an integrated ROADM degree and add/drop module having M common input and output ports and N add/drop input and output ports, wherein the integrated ROADM degree and add/drop module is formed by an M×N demultiplexer Contentionless Wavelength Selective Switch (CWSS) and an M×N multiplexer CWSS; and X degree modules, each having an input and output port connected to common ports of the integrated ROADM degree and add/drop module, a first set of ports of the N add/drop input and output ports are connected for degree-to-degree connectivity and a second set of ports of the N add/drop input and output ports are utilized for local add/drop, such that the integrated module provides both the degree-to-degree connectivity and the local add/drop.
1. A Reconfigurable Optical Add/Drop Multiplexer (ROADM) node with a Colorless, Directionless, and Contentionless (CDC) architecture, the ROADM node comprising:
an integrated ROADM degree and add/drop module having M common input and output ports and N add/drop input and output ports, wherein the integrated ROADM degree and add/drop module is formed by an M×N demultiplexer Contentionless Wavelength Selective Switch (CWSS) and an M×N multiplexer CWSS, M and N are integers; and
X degree modules, X is an integer and represents a number of degrees of the ROADM node, each having an input and output port connected to associated common ports of the integrated ROADM degree and add/drop module,
wherein a first set of ports of the N add/drop input and output ports are connected between the demultiplexer CWSS and the multiplexer CWSS for degree-to-degree connectivity and a second set of ports of the N add/drop input and output ports are utilized for local add/drop of channels, such that the integrated ROADM degree and add/drop module provides both the degree-to-degree connectivity and the local add/drop of channels utilizing the demultiplexer CWSS and the multiplexer CWSS, and
wherein the first set of ports is X*(X−1) input and output ports and the second set of ports is N−X*(X−1) input and output ports.
2. The ROADM node of claim 1 , wherein X≤4.
3. The ROADM node of claim 1 , wherein M−X input and output ports of the M common input and output ports are unequipped.
4. The ROADM node of claim 1 , wherein the first set of ports comprise input and output ports for each degree to connect to every other degree.
5. The ROADM node of claim 1 , wherein the demultiplexer CWSS and the multiplexer CWSS each comprise:
M 1×N Wavelength Selective Switches (WSSs) each connected to one of M common ports; and
N M×1 selector switches each connected to each of the M 1×N WSSs and connected to N add/drop ports.
6. The ROADM node of claim 5 , wherein the M 1×N WSSs are each formed using Liquid Crystal On Silicon (LCOS) and the N M×1 selector switches are formed using Microelectromechanical systems (MEMS) mirrors or a Planar Lightwave Circuit (PLC).
7. The ROADM node of claim 1 , wherein the X degree modules each comprise a pre-amplifier, a post-amplifier, and an Optical Service Channel (OSC) module.
8. An integrated Reconfigurable Optical Add/Drop Multiplexer (ROADM) degree and add/drop module with a Colorless, Directionless, and Contentionless (CDC) architecture, comprising:
M common input and output ports; and
N add/drop input and output ports, an M×N demultiplexer Contentionless Wavelength Selective Switch (CWSS) and an M×N multiplexer CWSS, M and N are integers, configured to optically connect the M common input and output ports and the N add/drop input and output ports,
wherein the integrated ROADM degree and add/drop module is utilized in an X degree ROADM node, X is an integer,
wherein a first set of ports of the N add/drop input and output ports are connected between the demultiplexer CWSS and the multiplexer CWSS for degree-to-degree connectivity and a second set of ports of the N add/drop input and output ports are utilized for local add/drop of channels, such that the integrated ROADM degree and add/drop module provides both the degree-to-degree connectivity and the local add/drop of channels utilizing the demultiplexer CWSS and the multiplexer CWSS, and
wherein the first set of ports is X*(X−1) input and output ports and the second set of ports is N−X*(X−1) input and output ports.
9. The integrated ROADM degree and add/drop module of claim 8 , wherein X≤4.
10. The integrated ROADM degree and add/drop module of claim 8 , wherein M−X input and output ports of the M common input and output ports are unequipped.
11. The integrated ROADM degree and add/drop module of claim 8 , wherein
the first set of ports comprise input and output ports for each degree to connect to every other degree.
12. The integrated ROADM degree and add/drop module of claim 8 , wherein the demultiplexer CWSS and the multiplexer CWSS each comprise:
M 1×N Wavelength Selective Switches (WSSs) each connected to one of M common ports; and
N M×1 selector switches each connected to each of the M 1×N WSSs and connected to N add/drop ports.
13. The integrated ROADM degree and add/drop module of claim 12 , wherein the M 1×N WSSs are each formed using Liquid Crystal On Silicon (LCOS) and the N M×1 selector switches are formed using Microelectromechanical systems (MEMS) mirrors or a Planar Lightwave Circuit (PLC).
14. The integrated ROADM degree and add/drop module of claim 8 , wherein each of X of the M common input and output ports are each connected to an associated degree module each comprising a pre-amplifier, a post-amplifier, and an Optical Service Channel (OSC) module.
15. An integrated Reconfigurable Optical Add/Drop Multiplexer (ROADM) degree and add/drop module with a Colorless, Directionless, and Contentionless (CDC) architecture, comprising:
M common input and output ports; and
N add/drop input and output ports, an M×N demultiplexer Contentionless Wavelength Selective Switch (CWSS) and an M×N multiplexer CWSS, M and N are integers, configured to optically connect the M common input and output ports and the N add/drop input and output ports,
wherein the integrated ROADM degree and add/drop module is utilized in an X degree ROADM node, X is an integer,
wherein a first set of ports of the N add/drop input and output ports are connected between the demultiplexer CWSS and the multiplexer CWSS for degree-to-degree connectivity and a second set of ports of the N add/drop input and output ports are utilized for local add/drop of channels, such that the integrated ROADM degree and add/drop module provides both the degree-to-degree connectivity and the local add/drop of channels utilizing the demultiplexer CWSS and the multiplexer CWSS, and,
wherein the demultiplexer CWSS and the multiplexer CWSS each include M 1×N Wavelength Selective Switches (WSSs) each connected to one of M common ports, and N M×1 selector switches each connected to each of the M 1×N WSSs and connected to N add/drop ports.
16. The integrated ROADM degree and add/drop module of claim 15 , wherein X≤4.
17. The integrated ROADM degree and add/drop module of claim 15 , wherein M−X input and output ports of the M common input and output ports are unequipped.
18. The integrated ROADM degree and add/drop module of claim 15 , wherein the first set of ports comprise input and output ports for each degree to connect to every other degree.
19. The integrated ROADM degree and add/drop module of claim 15 , wherein the M 1×N WSSs are each formed using Liquid Crystal On Silicon (LCOS) and the N M×1 selector switches are formed using Microelectromechanical systems (MEMS) mirrors or a Planar Lightwave Circuit (PLC).
20. The integrated ROADM degree and add/drop module of claim 15 , wherein each of X of the M common input and output ports are each connected to an associated degree module each comprising a pre-amplifier, a post-amplifier, and an Optical Service Channel (OSC) module.