Shared, colorless add/drop configuration for a ROADM network using M×N wavelength switches
First Claim
1. A system for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer transport network having a plurality of optical transponders comprising:
- a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to 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 a plurality of wavelength selective switches and the optical fan-in devices comprising a plurality of wavelength selective switches, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of a plurality of network degrees to be switched to another network degree of the plurality of network degrees;
a plurality of M×
N wavelength selective switches for locally dropping selected wavelengths, each M×
N wavelength selective switch for locally dropping selected wavelengths having M inputs connected to M network degrees;
a plurality of M×
N wavelength selective switches for locally adding selected wavelengths, each M×
N wavelength selective switch for locally adding selected wavelengths having M outputs connected to M network degrees; and
an optical coupler for adding an additional wavelength selective switch to each network degree.
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Accused Products
Abstract
A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network is disclosed. The system includes a plurality of M×N wavelength selective switches (WSS) for locally dropping selected wavelengths at a node, where each M×N WSS has M inputs connected to optical fan-out devices in each of M network degrees, and a plurality of M×N wavelength selective switches for locally adding selected wavelengths to a node, where each M×N WSS has M outputs connected to optical fan-in devices in each of M network degrees. Several expedients of M×N wavelength selective switches comprising M switching elements for use in the system are also disclosed.
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Citations
18 Claims
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1. A system for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer transport network having a plurality of optical transponders comprising:
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a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to 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 a plurality of wavelength selective switches and the optical fan-in devices comprising a plurality of wavelength selective switches, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of a plurality of network degrees to be switched to another network degree of the plurality of network degrees; a plurality of M×
N wavelength selective switches for locally dropping selected wavelengths, each M×
N wavelength selective switch for locally dropping selected wavelengths having M inputs connected to M network degrees;a plurality of M×
N wavelength selective switches for locally adding selected wavelengths, each M×
N wavelength selective switch for locally adding selected wavelengths having M outputs connected to M network degrees; andan optical coupler for adding an additional wavelength selective switch to each network degree. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. The A system for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer transport network having a plurality of optical transponders, comprising:
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a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to 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 a plurality of wavelength selective switches and the optical fan-in devices comprising a plurality of wavelength selective switches, the optical fan-out devices and optical fan-in devices being connected so as to enable signals input from each of a plurality of network degrees to be switched to another network degree of the plurality of network degrees; a plurality of M×
N wavelength selective switches for locally dropping selected wavelengths, each M×
N wavelength selective switch for locally dropping selected wavelengths having M inputs connected to an optical fan-out device in each of M network degrees;a plurality of M×
N wavelength selective switches for locally adding selected wavelengths, each M×
N wavelength selective switch for locally adding selected wavelengths having M outputs connected to an optical fan-in device in each of M network degrees;an optical coupler for adding an additional wavelength selective switch to each network degree; wherein each M×
N wavelength selective switch comprises M switching elements. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer transport network including a plurality of optical fan-out devices, each arranged to receive an input signal from a network degree and coupled to 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-out devices and optical fan-in devices being connected so as to enable signals input from each of a plurality of network degrees to be switched to another network degree of the plurality of network degrees, the method comprising:
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directing signals to a plurality of M×
N wavelength selective switches for locally dropping selected wavelengths, each M×
N wavelength selective switch for locally dropping selected wavelengths having M inputs connected to an optical fan-out device in each of M network degrees;directing signals to a plurality of M×
N wavelength selective switches for locally adding selected wavelengths, each M×
N wavelength selective switch for locally adding selected wavelengths having M outputs connected to an optical fan-in device in each of M network degrees; anddirecting signals to an additional wavelength selective switch coupled to each network degree using an optical coupler. - View Dependent Claims (17, 18)
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Specification