What is the diffrence between optical OFDM and All optical OFDM ?

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George Hedley Rokos

Optical OFDM apecifies only the transmission method.

As I understand it, the additional requirement for all-optical OFDM is that multiplexing and demultiplexing are performed on the optical signals directly rather than performing any of the work at different (lower) frequencies, e.g filtering/modulating/demodulating at baseband before/after frequency shifting.

Tariq Khwaja

Follow-up on George's comment:

All-Optical may refer to no electrical signal processing being involved in OFDM processing. This means no electro-optic signal conversion which is a bottleneck to fast network speeds.

Electrical signal processing requires, as George pointed out, work at lower frequencies while Optical signal processing can take place potentially without compromising speed much.