Hello! This section describes wavelength allocation principles.
Principle 1
Allocate long wavelengths first.
Generally, transmission networks are deployed progressively, and only a small number of wavelength channels are deployed initially. In a WDM system with a small number of channels, a long-wavelength channel performs better than a short-wavelength channel. Furthermore, after a WDM system is upgraded, the power budget of long-wavelength channels is stable and not likely to be affected.
Principle 2
Allocate the same wavelength to services that do not cause wavelength conflicts between spans, such as protection services and distributed services.
Principle 3
To prevent waste of wavelength resources and facilitate later wavelength allocation, allocate wavelengths first to service groups that have restrictions in wavelength allocation.
A service group consists of services that are transmitted over different routes. Protection services or ring services can be regarded as a service group.
For intra-board 1+1 protection and client-side 1+1 protection, it is recommended that you allocate the same wavelength to a service group at the transmit end and receive end so that the service group uses the same wavelength on the network. If different wavelengths are allocated to the service group, idle wavelength resources will exist on both the long trail and short trail, possibly leading to wavelength conflicts during an attempt to allocate wavelengths to other services on the network.
Principle 4
If a service will pass a regenerator, allocate the same wavelength to the service before and after the service passes the regenerator. The service route before the service passes the regenerator and that after the service passes the regenerator are exclusive. If different wavelengths are allocated to the service, a wavelength conflict may occur during an attempt to allocate wavelengths to other services.
That's all, I hope you like it.
Thank you!
