Reconfigurable optical add/drop multiplexor and optical switching node
First Claim
Patent Images
1. A reconfigurable optical add/drop multiplexor (ROADM) comprising:
- at least one input wavelength-selective switch (WSS) including an input port for inputting a plurality of input wavelength channels and a plurality of intermediate ports,the at least one input WSS being configured for independently redirecting the plurality of input wavelength channels to the plurality of intermediate ports for output as through wavelength channels or DROP wavelength channels;
at least one ADD switch, each at least one ADD switch comprising;
a plurality of first ingress ports for launching ADD wavelength channels, anda plurality of first egress ports for outputting the ADD wavelength channels,at least one DROP switch, each at least one DROP switch comprising;
a plurality of second ingress ports, one of which coupled to one of the plurality of intermediate ports of the at least one input WSS for receiving the DROP wavelength channels,a plurality of second egress ports for outputting the DROP wavelength channels,an array of directors for redirecting the DROP wavelength channels to a selected second egress port of the plurality of second egress ports, anda wavelength-selective coupler for coupling the plurality of second ingress ports to the array of directors and coupling the array of directors to the plurality of second egress ports,each director, of the array of directors, corresponding to a wavelength and is disposed, with respect to the wavelength-selective coupler, for receiving wavelength channels at the corresponding wavelength at a single location from any one of the plurality of second ingress ports, andat least one of;
the input port and the plurality of intermediate ports are arranged in a single row,the plurality of first ingress ports and the plurality of first egress ports are arranged in a single row, orthe plurality of second ingress ports and the plurality of second egress ports are arranged in a single row; and
a controller for controlling wavelength channel routing between the input WS S, the at least one ADD switch, and the at least one DROP switch.
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Abstract
A colorless, directionless ROADM includes a pair of contentioned add and drop wavelength-selective optical switches, an input wavelength-selective optical switch having one input port, and an output wavelength-selective optical switch having one output port. Unintended input-to-output port couplings, which appear in the “contentioned” add and drop switches, can be mitigated by the input and output wavelength-selective optical switches carrying the through traffic.
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Citations
20 Claims
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1. A reconfigurable optical add/drop multiplexor (ROADM) comprising:
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at least one input wavelength-selective switch (WSS) including an input port for inputting a plurality of input wavelength channels and a plurality of intermediate ports, the at least one input WSS being configured for independently redirecting the plurality of input wavelength channels to the plurality of intermediate ports for output as through wavelength channels or DROP wavelength channels; at least one ADD switch, each at least one ADD switch comprising; a plurality of first ingress ports for launching ADD wavelength channels, and a plurality of first egress ports for outputting the ADD wavelength channels, at least one DROP switch, each at least one DROP switch comprising; a plurality of second ingress ports, one of which coupled to one of the plurality of intermediate ports of the at least one input WSS for receiving the DROP wavelength channels, a plurality of second egress ports for outputting the DROP wavelength channels, an array of directors for redirecting the DROP wavelength channels to a selected second egress port of the plurality of second egress ports, and a wavelength-selective coupler for coupling the plurality of second ingress ports to the array of directors and coupling the array of directors to the plurality of second egress ports, each director, of the array of directors, corresponding to a wavelength and is disposed, with respect to the wavelength-selective coupler, for receiving wavelength channels at the corresponding wavelength at a single location from any one of the plurality of second ingress ports, and at least one of; the input port and the plurality of intermediate ports are arranged in a single row, the plurality of first ingress ports and the plurality of first egress ports are arranged in a single row, or the plurality of second ingress ports and the plurality of second egress ports are arranged in a single row; and a controller for controlling wavelength channel routing between the input WS S, the at least one ADD switch, and the at least one DROP switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A reconfigurable optical add/drop multiplexor (ROADM) comprising:
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at least one input wavelength-selective switch (WSS) including an input port for inputting a plurality of input wavelength channels and a plurality of intermediate ports, the at least one input WSS being configured for independently redirecting the plurality of input wavelength channels to the plurality of intermediate ports for output as through wavelength channels or DROP wavelength channels; at least one DROP switch, each at least one DROP switch comprising; a plurality of ingress ports, one of which coupled to one of the plurality of intermediate ports of the input WSS for receiving the DROP wavelength channels, a plurality of egress ports for outputting the DROP wavelength channels, an array of directors for redirecting the DROP wavelength channels to a selected egress port of the plurality of egress ports, and a wavelength-selective coupler for coupling the plurality of ingress ports to the array of directors and coupling the array of directors to the plurality of egress ports, each director, of the array of directors, corresponding to a wavelength and being disposed, with respect to the wavelength-selective coupler, for receiving wavelength channels at the corresponding wavelength at a single location from any one of the plurality of ingress ports, and at least one of; the input port and the plurality of intermediate ports are arranged in a single row, or the plurality of ingress ports and the plurality of egress ports are arranged in a single row; and a controller for controlling wavelength channel routing between the input WSS and the at least one DROP switch. - View Dependent Claims (11, 12, 13, 14)
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15. A reconfigurable optical add/drop multiplexor (ROADM) comprising:
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at least one ADD switch, each at least one ADD switch comprising; a plurality of ingress ports for launching ADD wavelength channels, and a plurality of egress ports for outputting the ADD wavelength channels, an output wavelength-selective switch (WSS), the output WSS including; a plurality of entrance ports, each entrance port, of plurality of entrance ports, being coupled to a respective one of the plurality of egress ports for inputting the ADD wavelength channels to be combined into an output signal, and an exit port for outputting the output signal,. at least one of; the plurality of ingress ports and the plurality of egress ports are arranged in a single row, or the plurality of entrance ports and the exit port are arranged in a single row; and a controller for controlling wavelength channel routing between the at least one ADD switch and the output WSS. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification