Abstract
In this paper, we investigate the system model of intensity modulation with direct detection (IM/DD)-based high-speed short-reach link with directly modulation laser (DML) and bandwidth-limitation optics devices. And, based on this model, we propose a modified Volterra equalizer to compensate distortion by constructing second-order feature vectors for support vector machine (SVM) trainer in this high-capacity and limited-bandwidth system. Owing to high-dimensional mapping characteristics of SVM, for our scheme, only a single classification hyperplane is needed to be trained to achieve satisfactory equalization performance for the multi-classification tasks of PAM-M, which would reduce the calculation complexity. Moreover, the 80-Gb/s PAM-4 per wavelength transmission experiment with 10-G optics in 20-km standard single mode fiber (SSMF) DML system is conducted and utilized to manifest the feasibility and effectiveness of our scheme. The results show that our scheme can reach the HD-FEC threshold and achieve outstanding performance than commonly used equalizers.
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