Figure 4
From: Photonic machine learning implementation for signal recovery in optical communications
Bit error rate dependence on fibre transmission distance in the short-reach communication system. When considering direct detection of the transmitted signal (black rectangles), the BER threshold of 10−3 for a hard-decision FEC is met for a fibre transmission length equal to 17 km. When applying the linear regression algorithm with 9-bits of training to the transmitted signal (red dots), the transmission length is extended to 29 km. Finally, when applying the photonic reservoir and the same algorithmic training (blue triangles), the transmission length is extended further to 51 km. The latter performance is obtained from the experimental implementation of the photonic reservoir. Therefore it includes all noise sources and instabilities of the system to environmental perturbations.
