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Coding to Improve Receiver Sensitivity for the Optical Intensity Modulation Direct-Detection System

The receiver sensitivity improvement of an optical intensity modulation/direct detection (IM/DD) system using error control code is analyzed. The cutoff rate is chosen as the performance criterion. It is found that there exists an optimum code rate which maximizes the upper bound of coding gain, and the upper bound of coding gain decreases as data rate increases. Finally, an example employing Reed-Solomon code is used to examine the practically achievable performance. When data rate is 565 Mbit/s, the coding gain can be up to 3.5 dB by using a (255,127) Reed-Solomon code