Monitoring of OSNR Using an Improved Binary Particle Swarm Optimization and Deep Neural Network in Coherent Optical Systems
1
College of Intelligent Science and Technology, National University of Defense Technology, Changsha 410073, China
2
College of Electric and Information Engineering, Hunan University of Technology, Changsha 412007, China
*
Author to whom correspondence should be addressed.
Photonics 2019, 6(4), 111; https://doi.org/10.3390/photonics6040111
Received: 30 August 2019 / Revised: 16 October 2019 / Accepted: 23 October 2019 / Published: 25 October 2019
A novel technique is proposed to implement optical signal-to-noise ratio (OSNR) estimation by using an improved binary particle swarm optimization (IBPSO) and deep neural network (DNN) based on amplitude histograms (AHs) of signals obtained after constant modulus algorithm (CMA) equalization in an optical coherent system. For existing OSNR estimation models of DNN and AHs, sparse AHs with valid features of original data are selected by IBPSO algorithm to replace the original, and the sparse sets are used as input vector to train and test the particle swarm optimization (PSO) optimized DNN (PSO-DNN) network structure. Numerical simulations have been carried out in the OSNR ranges from 10 dB to 30 dB for 112 Gbps PM-RZ-QPSK and 112 Gbps PM-NRZ-16QAM signals, and results show that the proposed algorithm achieves a high OSNR estimation accuracy with the maximum estimation error is less than 0.5 dB. In addition, the simulation results with different data input into the deep neural network structure show that the mean OSNR estimation error is 0.29 dB and 0.39 dB under original data and 0.29 dB and 0.37 dB under sparse data for the two signals, respectively. In the future dynamic optical network, it is of more practical significance to reconstruct the original signal and analyze the data using sparse observation information in the face of multiple impairment and serious interference. The proposed technique has the potential to be applied for optical performance monitoring (OPM) and is helpful for better management of optical networks.
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Keywords:
signal-to-noise ratio; coherent optical transmission system; deep neural network; particle swarm optimization; optical performance monitoring
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Sun, X.; Su, S.; Wei, J.; Guo, X.; Tan, X. Monitoring of OSNR Using an Improved Binary Particle Swarm Optimization and Deep Neural Network in Coherent Optical Systems. Photonics 2019, 6, 111.
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