Wavelength spacing for 200G signals

For 10 Gbit/s, 40 Gbit/s, and 100 Gbit/s signals, the wavelength spacing is 50 GHz for an 80-wavelength system and 100 GHz for a 40-wavelength system.
For 200 Gbit/s signals, the flexible grid technology can be used. When the technology is used, wavelength bandwidth is flexible, instead of being fixed at 50 GHz or 100 GHz. For example, if different modulation methods are used for 200 Gbit/s signals, different required bandwidth is required. (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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