Whether a DCM module intended for a 10G 40-wavelength OTN network can be used in a non-coherent 40G 80-wavelength network

Principally, a coherent network can be commissioned in the same way as a non-coherent network, without considering fiber access scenarios. In a scenario in which 100G coherent wavelengths need to be added on a non-coherent network for capacity expansion, the incident optical power can be reduced to increase the OSNR tolerance of the 100G wavelengths and the transmission distance without electrical regeneration. In this situation, the optical power of single non-coherent wavelengths will be definitely reduced. When this occurs, commission the network according to the network design.

40G non-coherent boards use the TDC technology and the dispersion tolerance is 800 ps/nm. 40G coherent boards use the DSP technology and the dispersion tolerance reaches 60,000 ps/nm. A network deploying non-coherent boards must use DCMs for dispersion compensation. A network that uses only coherent boards does not need to use DCMs.

Based on the nominal operating wavelength, the wavelength offset of an 80-wavelength OSN 6800 system must be within ±0.08 nm.

The nominal single-wavelength incident optical power is 1 dBm for an 80-wavelength system.

They can be interconnected when the wavelengths are consistent.