Fiber is capable of supporting both analog and digital transmission, just like electromagnetic signals down a copper line.
Verizon FiOS sends three independent signals down the same fiber line, using three wavelengths (colors.) One for QAM download which is an analog/digital hybrid just like cable QAM. The second for IP uploads, and the third for IP downloads. The IP upload/download signals are fully digital.
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Fiber is capable of supporting both analog and digital transmission, just like electromagnetic signals down a copper line.
Verizon FiOS sends three independent signals down the same fiber line, using three wavelengths (colors.) One for QAM download which is an analog/digital hybrid just like cable QAM. The second for IP uploads, and the third for IP downloads. The IP upload/download signals are fully digital.