通过子载波配对提高直接检测光正交频分复用系统的灵敏度并降低载波功率

Sensitivity improvement and carrier power reduction in direct-detection optical OFDM systems by subcarrier pairing.

作者信息

Hong Yi, Lowery Arthur J, Viterbo Emanuele

机构信息

Department of Electrical & Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia.

出版信息

Opt Express. 2012 Jan 16;20(2):1635-48. doi: 10.1364/OE.20.001635.

DOI:10.1364/OE.20.001635

PMID:22274506

Abstract

This paper introduces subcarrier pairing to optical OFDM systems and shows, using simulations, that the sensitivity of Direct-Detection Optical Orthogonal Frequency Division Multiplexed (DDO-OFDM) systems can be improved by 0.7 dB, without any coding overheads. Subcarrier pairing works because each subcarrier acquires a different electrical Signal to Interference plus Noise Ratio (SINR), which typically increases with the subcarrier's frequency. Pairing the good and bad subcarriers, so that information is split between them, improves the performance of the bad subcarrier more than it degrades the performance of the good subcarrier. This lowers the required Optical Signal to Noise Ratio (OSNR) for the system to give a certain Bit Error Ratio (BER).

摘要

本文将子载波配对引入光正交频分复用（OFDM）系统，并通过仿真表明，在没有任何编码开销的情况下，直接检测光正交频分复用（DDO - OFDM）系统的灵敏度可提高0.7 dB。子载波配对之所以有效，是因为每个子载波获得不同的电信号干扰加噪声比（SINR），该比值通常随子载波频率的增加而增大。将性能好的和性能差的子载波配对，使信息在它们之间分配，对性能差的子载波性能的提升大于对性能好的子载波性能的降低。这降低了系统达到特定误码率（BER）所需的光信噪比（OSNR）。