Partial activation of a media channel on channel holder-based optical links
An Optical Add/Drop Multiplexing (OADM) device forming a degree in an optical network includes one or more traffic switch ports configured to interface with occupied traffic signals; and a channel holder port configured to interface with one or more channel holder sources for unoccupied spectrum or traffic signals; wherein the OADM device is configured to receive a bandwidth intent for a media channel on the degree and the media channel includes any of the occupied traffic signals and the unoccupied spectrum or traffic signals, and to switch the one or more traffic switch ports and the channel holder port for spectrum in the bandwidth intent accordingly.
1 . An Optical Add/Drop Multiplexing (OADM) device forming a degree in an optical network, the OADM device comprising:
one or more traffic switch ports configured to interface with occupied traffic signals; and
a channel holder port configured to interface with one or more channel holder sources for unoccupied spectrum or traffic signals;
wherein the OADM device is configured to receive a bandwidth intent for a media channel on the degree and the media channel is a contiguous portion of optical spectrum that includes any of the occupied traffic signals, one or more spectral deadbands adjacent to the occupied traffic signals to avoid filter roll-off penalties, and the unoccupied spectrum or traffic signals, and to switch the one or more traffic switch ports and the channel holder port for spectrum in the bandwidth intent accordingly, wherein the OADM device opens optical filter bandwidth to the traffic switch ports only for the occupied traffic signals and adjacent deadbands, and switches remaining spectrum within the bandwidth intent to the channel holder port, such that, when the media channel is partially activated by including the unoccupied spectrum or traffic signals, the media channel is at full-fill spectrum power.
2 . The OADM device of claim 1 , wherein
when the bandwidth intent is filled with the occupied traffic signals, the OADM device is configured to switch the occupied traffic signals to the degree via the one or more traffic switch ports,
when the bandwidth intent is filled with the unoccupied spectrum or traffic signals, the OADM device is configured to switch the channel holder port to the degree for the spectrum via the channel holder port, and
when there is a mixture of the occupied traffic signals or unoccupied spectrum or traffic signals in the bandwidth intent, the OADM device is configured to switch both the one or more traffic switch ports and the channel holder port to the degree accordingly.
3 . The OADM device of claim 1 , wherein, when the occupied traffic signals occupy less than the spectrum of the bandwidth intent, the OADM device is configured to switch both the one or more traffic switch ports and the channel holder port to the degree accordingly.
4 . The OADM device of claim 1 , wherein the contiguous portion of the optical spectrum for the media channel includes (i) the occupied traffic signals, (ii) the unoccupied spectrum or traffic signals, and (iii) one or more deadbands to avoid filter roll-off penalties.
5 . The OADM device of claim 1 , wherein, when the occupied traffic signals include one or more traffic signals, the OADM device is configured to, responsive to a fault of a traffic signal of the one or more traffic signals, switch the one or more traffic switch ports for the faulted traffic signal to the channel holder port to the degree.
6 . The OADM device of claim 1 , wherein the OADM device is a Wavelength Selective Switch (WSS).
7 . The OADM device of claim 6 , wherein the WSS includes pixels configured to open to either the channel holder port or the one or more traffic switch ports based on the occupied traffic signals or unoccupied spectrum or traffic signals, such that pixels corresponding to the occupied traffic signals and adjacent deadbands are opened to the one or more traffic switch ports and pixels corresponding to remaining spectrum within the bandwidth intent are opened to the channel holder port.
8 . The OADM device of claim 1 , wherein the OADM device is configured to switch the one or more traffic switch ports and the channel holder port via opening associated optical filters therein.
9 . The OADM device of claim 8 , wherein the associated optical filters are configured to create a cumulative filter transfer function for each of the occupied traffic signals.
10 . The OADM device of claim 8 , wherein each optical filter of the associated optical filters has a spectral width that is greater than or equal to a minimum width of a channel plan in the optical network.
11 . The OADM device of claim 1 , wherein the OADM device is configured to add or remove the occupied traffic signals from the media channel by configuring the switch of the one or more traffic switch ports and the channel holder port to the degree.
12 . The OADM device of claim 1 , wherein the occupied traffic signals are network media channels in the media channel.
13 . A method in an Optical Add/Drop Multiplexing (OADM) forming a degree in an optical network, the method comprising steps of:
receiving a bandwidth intent for a media channel on the degree and the media channel is a contiguous portion of optical spectrum that includes any of occupied traffic signals, one or more spectral deadbands adjacent to the occupied traffic signals to avoid filter roll-off penalties, and unoccupied spectrum or traffic signals; and
switching spectrum in the bandwidth intent between (i) one or more traffic switch ports configured to interface with occupied traffic signals and (ii) a channel holder port configured to interface with one or more channel holder sources for the unoccupied spectrum or traffic signals, based on a fill of the media channel, wherein the OADM device opens optical filter bandwidth to the traffic switch ports only for the occupied traffic signals and adjacent deadbands, and switches remaining spectrum within the bandwidth intent to the channel holder port, such that, when the media channel is partially activated by including the unoccupied spectrum or traffic signals, the media channel is at full-fill spectrum power.
14 . The method of claim 13 , wherein
when the bandwidth intent is filled with the occupied traffic signals, the switching includes switching the occupied traffic signals to the degree via the one or more traffic switch ports,
when the bandwidth intent is filled with the unoccupied spectrum or traffic signals, the switching includes switching the channel holder port to the degree for the spectrum via the channel holder port, and
when there is a mixture of the occupied traffic signals or unoccupied spectrum or traffic signals in the bandwidth intent, the switching includes switching both the one or more traffic switch ports and the channel holder port to the degree accordingly.
15 . The method of claim 13 , wherein the occupied traffic signals occupy less than the spectrum of the bandwidth intent, and wherein the steps further include
including one or more deadbands in the spectrum which are not switched to either the one or more traffic switch ports or the channel holder port.
16 . The method of claim 13 , wherein the occupied traffic signals include one or more traffic signals, and wherein the steps further include
responsive to a fault of a traffic signal of the one or more traffic signals, switching the one or more traffic switch ports for the faulted traffic signal to the channel holder port to the degree.
17 . The method of claim 13 , wherein the OADM includes a Wavelength Selective Switch (WSS).
18 . The method of claim 13 , wherein the switching is via opening associated optical filters therein.
19 . The method of claim 18 , wherein the associated optical filters are configured to create a cumulative filter transfer function for each of the occupied traffic signals.
20 . The method of claim 13 , wherein the steps further include
adding or removing the occupied traffic signals from the media channel by switching between the one or more traffic switch ports and the channel holder port to the degree accordingly.