Abstract
A decision feedback equalization (DFE) algorithm is proposed by simplifying Volterra structure. The simplification principle and process of the proposed Volterra-based equalization algorithm are presented. With the support of this algorithm, the signal damage for four-level pulse amplitude modulation signal (PAM-4) is compensated, which is caused by device bandwidth limitation and dispersion during transmission in C-band intensity modulation direct detection (IM-DD) fiber system. Experiments have been carried out to demonstrate that PAM-4 signals can transmit over 2 km in standard single-mode fiber (SSMF) based on a 30 GHz Mach-Zehnder modulator (MZM). The bit error rate (BER) can reach the threshold of hard decision-forward error correction (HD-FEC) (BER=3.8×10−3) and its sensitivity is reduced by 2 dBm compared with traditional feedforward equalization (FFE). Meanwhile, the algorithm complexity is greatly reduced by 55%, which provides an effective theoretical support for the commercial application of the algorithm.
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The authors declare that there are no conflicts of interest related to this article.
This work has been supported by the China Southern Power Grid Science and Technology Project, Research on 230 MHz Iot Access Architecture for Deep Coverage of Power Edge Services and R&D of Key Communication Devices (No.036000KK52180036).
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Fu, J., Shi, Z. & Zhang, Z. 128 Gbit/s high speed optical interconnection networks in data centers by a 30 GHz Mach-Zehnder modulator. Optoelectron. Lett. 19, 36–40 (2023). https://doi.org/10.1007/s11801-023-2119-9
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DOI: https://doi.org/10.1007/s11801-023-2119-9