During the early phase of the project planning, we will encounter the problem of wavelength planning. Now, let me share my experience.
The OTN has six wavelength planning principles:
Principle 1: Generally, transport networks are constructed step by step. In the initial phase, only a few wavelength resources are used. Therefore, long wavelength resources should be preferentially allocated, that is, wavelengths with low frequency. It is recommended that you use the first wavelength when the wavelength is used, and then use the second wavelength. On the one hand, the long-wavelength channel performance is better than the short-wavelength channel performance when the number of wavelengths is small. On the other hand, after the expansion, the power budget of the long-wavelength channel is more stable and is not easy to be affected.
Second principle: Allocate the same wavelength resources to the protection service and the working service. For single-channel optical channel 1 + 1 protection, the working and protection services require the same wavelength resources. This ensures that the same wavelength resource on the entire ring is occupied by the service. If different wavelength resources are allocated to the protected service, some wavelength resources may be idle on the long path and the short path, while other services may conflict with the wavelength when allocating the wavelength resources.
Third principle: When wavelength resources are allocated to services, long-path services are preferentially allocated to reduce the wavelength congestion in the later phase.
Fourth principle: The trunk circuit uses the same wavelength before and after regeneration. The wavelength services before and after regeneration are actually mutually exclusive. If different wavelength resources are occupied, the wavelength allocation of other services will conflict.
Principle 5: In the early stage of network construction, the traditional WDM channel planning mode can be used. In this way, the point-to-point service exclusively occupies the channel, the services in the channel are diversified, and the channel is saturated. When the channel occupancy reaches a certain degree (depending on the service), it is recommended to use the shared channel to realize the service provisioning.
Principle 6: For a long-haul service or a service with a critical OSNR value, it is recommended that you use a shared channel to relay the service. In this way, the regeneration investment is saved.
If the statistics are not collected, you are welcome to participate in the discussion.
