No-guard-interval coherent optical OFDM with self-tuning receiver

被引：7
|
作者：
Du, Liang B. [1 ]
Lowery, Arthur J. [1 ]
机构：
[1] Monash Univ, Dept Elect & Comp Syst Engn, Clayton, Vic 3800, Australia
来源：
OPTICS EXPRESS | 2011年 / 19卷 / 03期
基金：
澳大利亚研究理事会;
关键词：
TRANSMISSION; SYSTEMS;
D O I：
10.1364/OE.19.002181
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose and experimentally demonstrate a no-guard-interval (No-GI) coherent optical orthogonal frequency division multiplexed (CO-OFDM) system that uses Fractionally-Spaced Time-Domain Equalizers (FS-TDE) to simultaneously demultiplex and equalize each subcarrier. Least-mean-squares algorithms (LMS) tune each FS-TDE to a subcarrier. A short unique training sequence is transmitted on each subcarrier, allowing each FS-TDE to lock onto its subcarrier. After the initial training, the adaptive blind equalizers remain tuned to their respective subcarriers. Unlike previous systems, this system does not require digital filtering or mixing of each subcarrier to baseband, so is more computationally efficient. Error-free transmission was measured over 800 km of fiber with a three-subcarrier 30 Gb/s system and a five-subcarrier 33.33 Gb/s system. The required OSNRs for a BER of 10(-3) were 8.6 dB and 9.3 dB respectively, which are within 1.5 dB of the theoretical limit for coherent systems. (C)2011 Optical Society of America
引用
收藏
页码：2181 / 2186
页数：6
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