Methods for Expanding Cross-Connect Capacity in a ROADM Optical Network
First Claim
1. A system for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network comprising a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to at least one of a plurality of optical fan-in devices, each optical fan-in device arranged to output a signal to a network degree, the optical fan-out devices comprising at least one wavelength selective switch and the optical fan-in devices comprising at least one wavelength selective switch, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of the plurality of network degrees to be switched to another network degree of the plurality of network degrees, wherein the improvement comprises:
- a first plurality and a second plurality of demultiplexers for locally dropping selected wavelengths; and
a first plurality and a second plurality of multiplexers for locally adding selected wavelengths,the first and second plurality disposed in a cascaded relationship.
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Abstract
A reconfigurable optical add-drop multiplexer (ROADM) transport network comprising a plurality of optical fan-out devices and a first plurality and a second plurality of demultiplexers for locally dropping selected wavelengths; and first plurality and a second plurality of multiplexers for locally adding selected wavelengths, the first and second plurality disposed in a cascaded relationship to enable selective coupling between network degrees.
30 Citations
11 Claims
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1. A system for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network comprising a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to at least one of a plurality of optical fan-in devices, each optical fan-in device arranged to output a signal to a network degree, the optical fan-out devices comprising at least one wavelength selective switch and the optical fan-in devices comprising at least one wavelength selective switch, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of the plurality of network degrees to be switched to another network degree of the plurality of network degrees, wherein the improvement comprises:
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a first plurality and a second plurality of demultiplexers for locally dropping selected wavelengths; and a first plurality and a second plurality of multiplexers for locally adding selected wavelengths, the first and second plurality disposed in a cascaded relationship. - View Dependent Claims (2, 3, 4, 5)
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6. A system for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network comprising a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to at least one of a plurality of optical fan-in devices, each optical fan-in device arranged to output a signal to a network degree, the optical fan-out devices comprising at least one wavelength selective switch and the optical fan-in devices comprising at least one wavelength selective switch, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of the plurality of network degrees to be switched to another network degree of the plurality of network degrees, wherein the improvement comprises:
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a first and second plurality of demultiplexers for locally dropping selected wavelengths, each demultiplexer comprising at least one wavelength selective switch (WSS) or splitter; and a first and second plurality of multiplexers for locally adding selected wavelengths, each multiplexer comprising at least one wavelength selective switch (WSS) or combiner; the first and second plurality disposed in a cascaded relationship. - View Dependent Claims (7, 8, 9, 10)
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11. A method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network comprising a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to at least one of a plurality of optical fan-in devices, each optical fan-in device arranged to output a signal to a network degree, the optical fan-out devices comprising at least one wavelength selective switch and the optical fan-in devices comprising at least one wavelength selective switch, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of the plurality of network degrees to be switched to another network degree of the plurality of network degrees, comprising the steps of:
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directing signals from the network degrees to a first and second plurality of demultiplexers for locally dropping selected wavelengths; and directing signals to a first and second plurality of multiplexers for locally adding selected wavelengths, wherein the first and second plurality of demultiplexers and multiplexers are disposed in a cascaded relationship.
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Specification