Dynamic wavelength service over a ROADM optical network
A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network to form a wave division multiplexing virtual private network is disclosed. The system includes at least one optical transponder, 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; a plurality of demultiplexers for locally dropping selected wavelengths; a plurality of multiplexers for locally adding selected wavelengths; and at least one customer-dedicated fiber switch interposed between the at least one optical transponder and the plurality of demultiplexers and multiplexers. The fiber switch is coupled to wavelengths and degrees that are allocated for a bandwidth-on-demand application. Other configurations include additional fan-in and fan-out devices interposed between a mux/demux assembly and the optical transponders to support wavelength redistribution applications.
1. A system for creating a wave division multiplexing virtual private network by 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 wavelength selective switch and the optical fan-in devices comprising a wavelength selective switch, 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 demultiplexers for locally dropping selected wavelengths;
a plurality of multiplexers for locally adding selected wavelengths; and
a customer-dedicated fiber switch interposed between the plurality of optical transponders and the plurality of demultiplexers and the plurality of multiplexers, the customer-dedicated fiber switch being coupled to wavelengths and degrees to reserve wavelengths for the customer, wherein the customer-dedicated fiber switch comprises first and second fiber switches interposed between a plurality of optical transponders and the plurality of multiplexers and the plurality of demultiplexers to provide a plurality of redundant paths through the reconfigurable optical add-drop multiplexer;
a pair of the plurality of optical transponders respectively coupled to the first fiber switch and the second fiber switch; and
a Y-splitter coupled to the pair of optical transponders.
2. The system of claim 1 , wherein the plurality of multiplexers and the plurality of demultiplexers have fixed-wavelength ports, and the plurality of optical transponders is tunable to any wavelength supported by the reconfigurable optical add-drop multiplexer.
3. The system of claim 1 , wherein the customer-dedicated fiber switch is a 2N×2N fiber switch.
4. The system of claim 1 , further comprising an optical transponder having a protection port, the optical transponder with the protection port being coupled to the first fiber switch and the second fiber switch.
5. A method for creating a wave division multiplexing virtual private network by 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 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 wavelength selective switch and the optical fan-in devices comprising a wavelength selective switch, 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 demultiplexers for locally dropping selected wavelengths; and a plurality of multiplexers for locally adding selected wavelengths, comprising:
connecting a customer-dedicated fiber switch between a plurality of optical transponders and the plurality of demultiplexers and the plurality of multiplexers, the customer-dedicated fiber switch being coupled to wavelengths and degrees to reserve wavelengths for the customer; wherein the customer-dedicated fiber switch comprises first and second fiber switches interposed between a plurality of optical transponders and the plurality of multiplexers and the plurality of demultiplexers to provide a plurality of redundant paths through the reconfigurable optical add-drop multiplexer, a pair of the plurality of optical transponders respectively coupled to the first fiber switch and the second fiber switch, and a Y-splitter coupling the pair of optical transponders.
6. The method of claim 5 , wherein the customer-dedicated fiber switch is a 2N×2N fiber switch.