title: Wideband dynamic behavioral modeling of reflective semiconductor optical amplifiers using a tapped-delay multilayer perceptron.
abstract: In this paper, we propose a wideband dynamic behavioral model for a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in colorless radio over fiber (RoF) systems using a tapped-delay multilayer perceptron (TDMLP). 64 quadrature amplitude modulation (QAM) signals with 20 Msymbol/s were used to train, validate and test the model. Nonlinear distortion and dynamic effects induced by the RSOA modulator are demonstrated. The parameters of the model such as the number of nodes in the hidden layer and memory depth were optimized to ensure the generality and accuracy. The normalized mean square error (NMSE) is used as a figure of merit. The NMSE was up to -44.33 dB when the number of nodes in the hidden layer and memory depth were set to 20 and 3, respectively. The TDMLP model can accurately approximate to the dynamic characteristics of the RSOA modulator. The dynamic AM-AM and dynamic AM-PM distortions of the RSOA modulator are drawn. The results show that the single hidden layer TDMLP can provide accurate approximation for behaviors of the RSOA modulator.
authors.affiliation: Instituto de Telecomunicações, Dep. Electrónica Telecomunicações e Informática, Universidade de Aveiro, Campus Universitário de Santiago, Aveiro 3810-193, Portugal.
authors.forename: Zhansheng
authors.initials: Z
authors.lastname: Liu
authors.forename: Manuel Alberto
authors.initials: MA
authors.lastname: Violas
authors.forename: Nuno Borges
authors.initials: NB
authors.lastname: Carvalho
mesh_terms: D000669:Amplifiers, Electronic; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D016571:Neural Networks, Computer; D055096:Optical Devices; D012666:Semiconductors