Abstract
Recently, coherent optical OFDM (CO-OFDM) has been proposed in optical
network to increase the transmission distance with combating chromatic dispersion.
CO-OFDM system has been successfully processed and recovered for transmitted
signals without chromatic dispersion compensation. However, in optical links,
the available optical power is limited due to safety and power consumption.
Therefore, in this paper, we focus on the minimizing the optical power and
propose the CO-OFDM with punctured LDPC codes and variable amplitude block
codes. In the proposed system, we consider the rate-compatible punctured code
(RCPC) without erasing the coded bits corresponding to zeros in the puncturing
pattern and assign them to the subcarriers. In this case, the transmission
rate is not degraded compared to the original code. Moreover, the coded bits
corresponding to zeros in the puncturing pattern are mapped with reduced amplitude.
Therefore, it is possible to increase the transmission distance with reducing
the required OSNR for satisfying the target BER.
© 2008 IEEE
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