RECONFIGURABLE OPTICAL ADD/DROP MULTIPLEXOR AND OPTICAL SWITCHING NODE
First Claim
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1. A ROADM comprising:
- at least one input wavelength-selective switch (WSS) having an input port for inputting a plurality of input wavelength channels, and a plurality of intermediate ports, wherein the input WSS is configured for independently redirecting the input wavelength channels to the intermediate ports for output as through or DROP wavelength channels;
at least one ADD switch, each comprising;
a plurality of ingress ports for launching ADD wavelength channels,a plurality of egress ports for outputting the ADD wavelength channels,a first array of directors for redirecting the ADD wavelength channels impinging thereon to a selected egress port, anda first wavelength-selective coupler for coupling the ingress ports to the array of directors, and the array of directors to the egress ports,at least one DROP switch, each comprising;
a plurality of ingress ports, one of which coupled to one of the intermediate ports of the input WSS for receiving the DROP wavelength channels,a plurality of egress ports for outputting the DROP wavelength channels,a second array of directors for redirecting the DROP wavelength channels impinging thereon to a selected one of the egress ports, anda second wave length-selective coupler the ingress ports to the second array of directors, and the second array of directors to the egress ports.wherein each director of the first and second arrays corresponds to a unique center wavelength, and each director is disposed with respect to the respective wavelength-selective coupler for receiving any and all wavelength channels at the corresponding center wavelength at a single location from any one of the ingress ports, wherein each director has a plurality of independently controllable states, wherein each of the states defines a single coupling relationship between the ingress ports and the egress ports, whereby different wavelength channels are independently switchable by different directors of the array between the ingress and the egress ports; and
at least one output WSS having a plurality of entrance ports, each of the entrance ports coupled to a respective one of the intermediate ports of each input WSS or a respective one of the egress ports of each ADD switch for inputting the through and ADD wavelength channels to be combined into an output WDM signal, and an exit port for outputting the output WDM signal.
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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.
8 Citations
20 Claims
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1. A ROADM comprising:
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at least one input wavelength-selective switch (WSS) having an input port for inputting a plurality of input wavelength channels, and a plurality of intermediate ports, wherein the input WSS is configured for independently redirecting the input wavelength channels to the intermediate ports for output as through or DROP wavelength channels; at least one ADD switch, each comprising; a plurality of ingress ports for launching ADD wavelength channels, a plurality of egress ports for outputting the ADD wavelength channels, a first array of directors for redirecting the ADD wavelength channels impinging thereon to a selected egress port, and a first wavelength-selective coupler for coupling the ingress ports to the array of directors, and the array of directors to the egress ports, at least one DROP switch, each comprising; a plurality of ingress ports, one of which coupled to one of the intermediate ports of the input WSS for receiving the DROP wavelength channels, a plurality of egress ports for outputting the DROP wavelength channels, a second array of directors for redirecting the DROP wavelength channels impinging thereon to a selected one of the egress ports, and a second wave length-selective coupler the ingress ports to the second array of directors, and the second array of directors to the egress ports. wherein each director of the first and second arrays corresponds to a unique center wavelength, and each director is disposed with respect to the respective wavelength-selective coupler for receiving any and all wavelength channels at the corresponding center wavelength at a single location from any one of the ingress ports, wherein each director has a plurality of independently controllable states, wherein each of the states defines a single coupling relationship between the ingress ports and the egress ports, whereby different wavelength channels are independently switchable by different directors of the array between the ingress and the egress ports; and at least one output WSS having a plurality of entrance ports, each of the entrance ports coupled to a respective one of the intermediate ports of each input WSS or a respective one of the egress ports of each ADD switch for inputting the through and ADD wavelength channels to be combined into an output WDM signal, and an exit port for outputting the output WDM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20)
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15. A wavelength-selective switch (WSS) comprising a plurality of ingress ports, a plurality of egress ports, a LCoS array for redirecting wavelength channels impinging thereon, and wavelength-selective coupler for coupling the ingress ports to the LCoS array, and the LCoS array to the egress ports,
wherein the LCoS array comprises a plurality of directors each comprising a plurality of pixels, wherein each director corresponds to a unique center wavelength, and each director is disposed with respect to the wavelength-selective coupler for receiving any wavelength channel at the corresponding center wavelength at a single location from any one of the ingress ports, for imparting a phase retardation profile to an impinging wavelength channel, thereby redirecting the impinging wavelength channel; wherein each director of the array has a plurality of independently controllable states, wherein each of the states defines a single coupling relationship between the ingress ports and the egress ports, whereby different wavelength channels are independently switchable by the directors of the array between the ingress and the egress ports. - View Dependent Claims (16)
Specification