Mehedy Lenin, Bakaul Masuduzzaman, Nirmalathas Ampalavanapillai
NICTA Victoria Research Laboratory, Department of Electrical and Electronic Engineering, The University of Melbourne, VIC 3010, Australia.
Opt Express. 2010 Oct 25;18(22):23161-72. doi: 10.1364/OE.18.023161.
In this paper, we theoretically analyze and demonstrate that spectral efficiency of a conventional direct detection based optical OFDM system (DDO-OFDM) can be improved significantly using frequency interleaving of adjacent DDO-OFDM channels where OFDM signal band of one channel occupies the spectral gap of other channel and vice versa. We show that, at optimum operating condition, the proposed technique can effectively improve the spectral efficiency of the conventional DDO-OFDM system as much as 50%. We also show that such a frequency interleaved DDO-OFDM system, with a bit rate of 48 Gb/s within 25 GHz bandwidth, achieves sufficient power budget after transmission over 25 km single mode fiber to be used in next-generation time-division-multiplexed passive optical networks (TDM-PON). Moreover, by applying 64- quadrature amplitude modulation (QAM), the system can be further scaled up to 96 Gb/s with a power budget sufficient for 1:16 split TDM-PON.
在本文中，我们从理论上分析并证明，对于基于传统直接检测的光正交频分复用系统（DDO-OFDM），通过相邻DDO-OFDM信道的频率交织，其中一个信道的OFDM信号频段占据其他信道的频谱间隙，反之亦然，可以显著提高其频谱效率。我们表明，在最佳工作条件下，所提出的技术能够将传统DDO-OFDM系统的频谱效率有效提高多达50%。我们还表明，这样一个频率交织的DDO-OFDM系统，在25 GHz带宽内具有48 Gb/s的比特率，在通过25 km单模光纤传输后，能够获得足够的功率预算，可用于下一代时分复用无源光网络（TDM-PON）。此外，通过应用64正交幅度调制（QAM），该系统可以进一步扩展到96 Gb/s，并且具有足以支持1:16分光TDM-PON的功率预算。
