Lightning strokes can cause an ultrafast rotation of the state of polarization (RSOP) in an optical ground wire cable, which leads to communication interruptions. To address this, a simplified radius-directed linear Kalman filter (S-RD-LKF) for blind polarization demultiplexing was developed. The ultrafast RSOP under thunderstorm weather conditions was simulated based on the Heidler model, and the simulation results indicated that the proposed S-RD-LKF algorithm effectively compensated for the RSOP impairment caused by the first and subsequent lightning strokes. Moreover, the RD-LKF algorithm and the proposed S-RD-LKF algorithm exhibited a similar performance; however, the computation complexity of the proposed algorithm was lower.
We propose a 16-ary quadrature amplitude modulation (16-QAM) signal decision algorithm termed as the joint support vector machine (SVM) and K-nearest neighbor (KNN) module (JSKM). The M-ary SVM makes the first decision for all the received symbols. Subsequently, the KNN algorithm makes the second decision for the received symbols inside the decision boundary of the SVM. In this manner, the advantages of the SVM can be exploited and the KNN algorithm can help overcome the limitations of the SVM. The proposed algorithm was implemented to perform the simulation of a 112-Gbps 16-QAM coherent optical transmission system. The results demonstrated the superiority of the JSKM algorithm as it could increase the transmission distance by 440 and 227 km compared to those obtained using the KNN and M-ary SVM algorithms, respectively.
KEYWORDS: Orthogonal frequency division multiplexing, Polarization, Signal detection, Digital signal processing, Photodetectors, Modulation, Single sideband modulation, Modulators, Receivers, Optical engineering
Polarization-interleave-multiplexed (PIM) with single-sideband orthogonal frequency-division multiplexing (SSB-OFDM) based on direct detection is proposed for short-reach applications transmitted up to 80 km in which the guard band can be shared for the two SSB signals with interleave electrical center frequencies. Based on two dual-drive Mach–Zehnder modulators with one single-end photodetector (PD), 100-Gb/s PIM-SSB-OFDM transmission over a 80-km standard single-mode fiber is successfully demonstrated. After 80-km transmission, the optical signal-to-noise ratio requirement is 29.1 dB with respect to the bit error rate threshold of 7% hard decision-forward error correction overhead.
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