Channel spacing of 200G signals

For 10G, 40G, and 100G signals, the channel spacing is 50 GHz for an 80-wavelength system and 100 GHz for a 40-wavelength system.
For 200G signals, the flexible grid technology can be used. When the technology is used, wavelength bandwidth is variable. For example, if different modulation methods are used for 200G signals, the required bandwidth is different. For example, it can be 75 GHz or 150 GHz.Flexible ROADM adjusts bandwidth based on signals and grooms the signals to specified directions according to the network configurations.

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