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Articles by Tonghui Ji
Integrating fixed and mobile coherent optical access networks for unified broadband services
Abstract The integration of fixed and mobile optical access networks can enhance resource utilization, reduce network complexity, and lower deployment costs. Here, we report a field trial demonstrating the integration of hardware-efficient coherent optical transmission and high-fidelity analog waveform delivery over a single optical carrier for converged fixed-mobile networks, enabled by the proposed amplitude-phase layered modulation.
112-GBaud mode-division-multiplexing IM-DD transmission beyond net 6.4 Tb/s over weakly coupled FMF for optical interconnections
Weakly coupled mode-division-multiplexing (MDM) systems based on intensity modulation and direct detection (IM-DD) are a good candidate for further improving the capacity of short-reach optical interconnections. However, restrained by the modal crosstalk of the transmission link and the reception of degenerate mode groups (DMGs) utilizing bandwidth-limited multimode photodetectors (PDs), high-speed MDM IM-DD has encountered a capacity bottleneck.
Advanced Neural Network-Based Equalization in Intensity-Modulated Direct-Detection Optical Systems: Current Status and Future Trends
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Weight-adaptive joint mixed-precision quantization and pruning for neural network-based equalization in short-reach direct detection links
Neural network (NN)-based equalizers have been widely applied for dealing with nonlinear impairments in intensity-modulated direct detection (IM/DD) systems due to their excellent performance. However, the computational complexity (CC) is a major concern that limits the real-time application of NN-based receivers.
Cascade recurrent neural network-assisted nonlinear equalization for a 100 Gb/s PAM4 short-reach direct detection system
Abstract We propose a novel, to the best of our knowledge, cascade recurrent neural network (RNN)-based nonlinear equalizer for a pulse amplitude modulation (PAM)4 short-reach direct detection system. A 100 Gb/s PAM4 link is experimentally demonstrated over 15 km standard single-mode fiber (SSMF), using a 16 GHz directly modulated laser (DML) in C-band.
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