Max capacity of c band in optical communication
100 GHz fixed grid for 40/48 wavelengths- Single wavelengh Max capacity could be 100G/200G
50 GHz fixed grid for 80/96 wavelengths-Single wave Max capacity could be 100G/200G
Flex Grid for many wavelengths(Each slice capacity :12.5GHz, Wavelength could be many- dedends on slicing requirments; For instance for 400G- 3 slices are needed(12.5*3):37.5Ghz
By the way, technology it is continously eloving we could expect many wavelegths in C band in near future.