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Optical orthogonal frequency division multiplexing (O-OFDM) schemes arevariations of OFDM schemes which produce non-negative signals.Asymmetrically-clipped O-OFDM (ACO-OFDM) is a single-layer O-OFDM scheme, whosespectral efficiency can be enhanced by adopting multiple ACO-OFDM layers or acombination of ACO-OFDM and other O-OFDM schemes. However, since symboldetection in such enhanced ACO-OFDM (eACO-OFDM) is done iteratively, erroneousdetection leads to residual clipping noise (RCN) which can degrade performancein practice. Thus, it is important to develop an accurate model for RCN whichcan be used to design RCN-aware eACO-OFDM schemes. To this end, this paperprovides a mathematical analysis of RCN leading to an accurate model of RCNpower. The obtained model is used to analyze the performance of variouseACO-OFDM schemes. It is shown that the model provides an accurate evaluationof symbol error rate (SER), which would be underestimated if RCN is ignored.Moreover, the model is shown to be useful for designing an RCN-aware resourceallocation that increases the robustness of the system in terms of meeting atarget SER, compared to an RCN-unaware design.

Residual Clipping Noise in Multi-layer Optical OFDM: Modeling, Analysis, and Application