Dongdong Zou, Fan Li, Zibin Li, Yidan Sun, Li Ding, X. Yi, Zhaohui Li, Qi Sui, Jianping Li
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引用次数: 1
摘要
本文通过实验比较了位加载离散多音(DMT)信号和预均衡离散-傅立叶变换扩频(dft -扩频)DMT信号在直接检测强度调制(IM-DD)系统中的性能。我们首先通过实验证明，在直接调制激光(DML)的20公里传输中，基于优化的二次曲线(QC)拟合预均衡的DFT-Spread DMT信号的误码率(BER)优于基于零强迫的0波段预均衡。实验结果表明，在19GHz带宽下，采用优化QC拟合预均衡的DFT-Spread DMT信号在95Gbit/s的传输中，其误码率优于单位DMT信号。以-1 dBm接收光功率(ROP)传输20 km SSMF后，位加载DMT信号和优化QC拟合预均衡DMT信号的误码率分别为5.8×10-3和1.8×10-3。
Comparision of Bit-loading and DFT-Spread DMT Signal Transmission in O-band IM/DD System utilizing DML
In this paper, we experimentally compared the performance of bit-loading discrete multi-tone (DMT) signal and discrete-Fourier-transform spread (DFT-Spread) DMT signal with pre-equalization in Intensity Modulation with Direct Detection (IM-DD) system. We first experimentally demonstrated that the bit error ratio (BER) of DFT-Spread DMT signal with optimized Quadric Curve (QC) fitting-based pre-equalization outperforms Zero-Forcing based pre-equalization in O-band over 20-km transmission utilizing directly modulated laser (DML). We also experimentally demonstrated that DFT-Spread DMT signal with optimized QC fitting pre-equalization shows better BER performance than bit-loading DMT signal in 95Gbit/s signal transmission with 19GHz bandwidth. The BER of bit-loading DMT signal and DFT-Spread DMT signal with optimized QC fitting pre-equalization after 20-km SSMF transmission at -1 dBm received optical power (ROP) are 5.8×10-3 and 1.8×10-3, respectively.
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