Abstract
In this paper, three forms of orthogonal frequency division μltiplexing
(OFDM) designed for intensity modulated/direct detection (IM/DD) optical systems
are compared. These are asymmetrically clipped optical OFDM (ACO-OFDM), DC
biased optical OFDM (DCO-OFDM) and asymmetrically clipped DC biased optical
OFDM (ADO-OFDM). ADO-OFDM is a new technique that combines aspects of ACO-OFDM
and DCO-OFDM by siμltaneously transmitting ACO-OFDM on the odd subcarriers
and DCO-OFDM on the even subcarriers. The odd subcarriers are demodulated
as in a conventional ACO-OFDM receiver and the even subcarriers are demodulated
using a form of interference cancellation. ADO-OFDM is shown to be more optically
power efficient than conventional ACO-OFDM and DCO-OFDM, for some bit rate/normalized
bandwidths. It is also shown that by varying the proportion of optical power
on the ACO-OFDM component, the DC bias level of DCO-OFDM and the constellations
sent on the odd and even subcarriers, the optical power efficiency of ADO-OFDM
can be changed.
© 2013 IEEE
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