Bundling capacity changes in channel holder based optical links
Systems and methods include, responsive to a request for capacity change of X channels, X is an integer >1, on an optical section ( 14 ) and at an Optical Add/Drop Multiplexer (OADM) node ( 12 ) in an optical network ( 10 ), dividing optical spectrum on the optical section into M slots, M is an integer >1, such that the capacity change of X channels takes a maximum of N steps, N is an integer >1; and performing the capacity change of X channels in up to the N steps in an interleaved manner that changes a subset of the X channels in each of the N steps. For each step, the performing can include a maximum of M/N slots of the M slots with spacing between each of the M/N slots not used for the capacity change in a corresponding step. The spacing can be f, (N+f), (2N+f), . . . , M over the optical spectrum, where f is each step, f=1, 2, . . . , N.
1. An Optical Add/Drop Multiplexer (OADM) node comprising
a Wavelength Selective Switch (WSS) connected to the optical section; and
a controller communicatively coupled to the WSS and configured to
receive a request for a capacity change for a plurality of channels on the optical section,
determine a grouping of the plurality of channels in N steps, N is an integer >1, based on an impact to existing traffic-carrying channels, wherein the grouping assigns each of the plurality of channels to a step of the N, steps, and
cause the N steps for the capacity change which includes switching between traffic-carrying channels and channel holders.
2. The OADM node of claim 1 , wherein each step of the N steps includes some of the plurality of channels placed throughout optical spectrum for the optical section.
3. The OADM node of claim 2 , wherein the placement includes interleaving between each of the N steps.
4. The OADM node of claim 1 , wherein the impact includes amplifier tilt, ripple, spectral hole burning effects, and changes in Stimulated Raman Scattering (SRS).
5. The OADM node of claim 1 , wherein a controller performs the capacity change without coordination with other controllers in other optical sections.
6. A method implemented in an Optical Add/Drop Multiplexer (OADM) node comprising:
receiving a request for a capacity change for a plurality of channels on an optical section,
determining a grouping of the plurality of channels in N steps, N is an integer >1, based on an impact to existing traffic-carrying channels, wherein the grouping assigns each of the plurality of channels to a step of the N steps; and
causing the N steps for the capacity change which includes switching between traffic-carrying channels and channel holders.
7. The method of claim 6 , wherein each step of the N steps includes some of the plurality of channels placed throughout optical spectrum for the optical section.
8. The method of claim 7 , wherein the placement includes interleaving between each of the N steps.
9. The method of claim 6 , wherein the impact includes amplifier tilt, ripple, spectral hole burning effects, and changes in Stimulated Raman Scattering (SRS).
10. The method of claim 6 , wherein a controller performs the capacity change without coordination with other controllers in other optical sections.
11. A non-transitory computer-readable medium comprising instructions that, when executed, cause a controller associated with an Optical Add/Drop Multiplexer (OADM) node to perform steps of:
receiving a request for a capacity change for a plurality of channels on an optical section,
determining a grouping of the plurality of channels in N steps, N is an integer >1, based on an impact to existing traffic-carrying channels, wherein the grouping assigns each of the plurality of channels to a step of the N steps; and
causing the N steps for the capacity change which includes switching between traffic-carrying channels and channel holders.
12. The non-transitory computer-readable medium of claim 1 , wherein each step of the N steps includes some of the plurality of channels placed throughout optical spectrum for the optical section.
13. The non-transitory computer-readable medium of claim 12 , wherein the placement includes interleaving between each of the N steps.
14. The non-transitory computer-readable medium of claim 11 , wherein the impact includes amplifier tilt, ripple, spectral hole burning effects, and changes in Stimulated Raman Scattering (SRS).