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Full-subcarriers Polar-OFDM for optical spectrum-efficient transmission exploiting Polarization Multiplexing

机译：利用极化复用的全副载波Polar-OFDM用于高效频谱传输

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摘要

The exponential growth of the demand for broadband services has imposed great challenges on the design of spectrum-efficient optical transmission system in Passive Optical Network (PON). Recently, an innovative Orthogonal Frequency Division Multiplexing (OFDM) scheme, called Polar-OFDM (P-OFDM), has emerged as a promising solution to boost the spectral efficiency of optical transmission in PON. However, the traditional P-OFDM does not yet perform best in spectral efficiency as it only uses half of the total subcarriers. In this paper, we verify a promising complementation between Polarization Multiplexing (POLMUX) and P-OFDM aiming at higher spectral efficiency. We then propose the full-subcarriers P-OFDM by loading data on the even-indexed subcarriers of X polarization and the odd-indexed subcarriers of Y polarization, respectively. Thus, all of the subcarriers will be utilized for effective data transmission, which can double the spectral efficiency. More importantly, because the subcarriers are interlaced on different polarizations, the cross-polarization interference can be significantly mitigated, which enables the independent channel estimation and equalization at the receiver to recover the data carried on each polarization. Our evaluation results demonstrate that the proposed system realizes the double spectral efficiency of the traditional P-OFDM with reasonable Bit Error Rate (BER) performance loss.
机译：宽带服务需求的指数增长对无源光网络（PON）中频谱高效的光传输系统的设计提出了巨大挑战。最近，一种创新的正交频分复用（OFDM）方案，称为Polar-OFDM（P-OFDM），已经成为提高PON中光传输频谱效率的有前途的解决方案。然而，传统的P-OFDM在频谱效率上还没有达到最佳效果，因为它仅使用了全部子载波的一半。在本文中，我们验证了极化复用（POLMUX）和P-OFDM之间有希望的互补性，旨在实现更高的频谱效率。然后，我们通过将数据分别加载到X极化的偶数索引子载波和Y极化的奇数索引子载波上来提出全子载波P-OFDM。因此，所有子载波将被用于有效的数据传输，这可以使频谱效率加倍。更重要的是，由于子载波在不同的极化上交织，因此可以显着减轻交叉极化干扰，从而可以在接收机处进行独立的信道估计和均衡，以恢复每个极化所承载的数据。我们的评估结果表明，该系统以合理的误码率（BER）性能损失实现了传统P-OFDM的双频谱效率。

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