Effects of symbol time misalignment and frequency offset on performance of realistic all-optical OFDM system

We theoretically investigate the performance of realistic all-optical orthogonal frequency division multiplexing (AO-OFDM) system and analyzed effects of OFDM symbol time misalignment and frequency offset between transmitter and receiver on performance of AO-OFDM system. For 10-subcarrier system without cyclic prefix (CP), results shows that the time misalignment gives more penalty in received Q² and high BER than frequency offset, measured for subcarrier at middle. To keep BER performance under 10^-3 for subcarriers at middle, maximum acceptable relative deviation for symbol time misalignment is 16% and for frequency offset is 24%.