DD-OFDM vs CO-OFDM

最新推荐文章于 2021-06-17 17:49:00 发布

原创最新推荐文章于 2021-06-17 17:49:00 发布 · 1k 阅读

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本文介绍了光学正交频分复用（OFDM）技术的主要优势在于能够有效处理高速光学传输系统中的符号间干扰（ISI），如色散和偏振模色散（PMD）。文中还对比了两种常见的光学OFDM传输方案：直接检测光学OFDM (DD-O-OFDM) 和相干光学OFDM (CO-OFDM)，分别适用于成本敏感的短距离应用和要求高性能的长距离传输。

The main advantage of optical OFDM is that it can deal with virtually unlimited amounts of inter symbol interference (ISI). In high-speed optical transmission systems, ISI is caused for instance by chromatic dispersion and polarization mode dispersion (PMD).

Two common optical OFDM transmission schemes: Direct-Detection OpticalOFDM (DD-O-OFDM) and Coherent-Optical OFDM (CO-OFDM).

DD-OFDM is realized by sending the optical carrier along with the OFDM band so that direct detection with a single photodiode can be used at the receiver. It requires fewer components at the receiver; it is more suitable for cost-effective short reach applications

In a CO-OFDM system, the optical carrier is suppressed at the transmitter and a local oscillator and optical hybrid is required. The superior performance is higher optical-signal-to-noise-ratio, PMD tolerance and spectral efficiency, so that CO-OFDM is better for long-distance transmission systems.