Replacement of optical modules with different channel spacings for 1600G devices

Question:
WDM-side optical modules of the OTU boards on 1600G devices come in two types: 50 GHz and 100 GHz channel spacing ones. Can these two types of optical modules with the same frequency and rate replace each other?
Analysis:
The differences between the two types of optical modules are as follows: 1. Modules in a 50 GHz spacing system have high requirements on wavelength stability. A wavelength locker is integrated in a module, whereas the modules in a 100 GHz spacing system have no wavelength locker. 2. These two types of modules have different dispersion tolerances. The 50 GHz type has a dispersion tolerance of 1500 ps/nm, whereas the 100 GHz type has that of 800 ps/nm. However, with the improvement in processing techniques, the difference in dispersion tolerances will become smaller and smaller.
Answer:
1. The 100 GHz modules should not be used to replace the 50 GHz modules on the OTU boards. 2. The 50 GHz modules can be used to replace the 100 GHz modules. However considering different types of optical modules on the entire network, you are advised to replace modules with the same type modules.

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