Peak-to-average power ratio reduction using coded signal in optical-orthogonal frequency division multiplexing systems

A new coding scheme is proposed using a variable rate for an all-optical sampling orthogonal frequency-division multiplexing system, to minimise the peak-to-average power ratio. Cyclic rotation and code rate variation are shown to improve the peak envelope power. The proposed idea comprises of searching for a variable code rate selection for the binary input data and cyclic rotation, followed by codeword inversion.