High-fidelity WDM/SDM fronthaul system based on state-continuous variable-bit coding and sparse residual enhancement
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Jiongbin Deng1, Ningyuan Zhong1, Jincong Hu1
1Key Laboratory of Photonic-Electric Integration and Communication-Sensing Convergence, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.
Abstract:
We propose a WDM/SDM fronthaul system integrating state-continuous variable-bit source coding and sparse OFDM-domain residual enhancement. The encoder adaptively assigns 3-6 bits according to RF-waveform activity while preserving recursive coding states, reducing the source rate to 5.05 bits/RF sample with 2.72% OFDM EVM. A K20 sparse residual layer lowers the EVM to 1.83% at a total useful source rate of 5.23 bits/RF sample, which remains 12.8% below fixed 6-bit coding. Using 20-GBaud PAS-PAM8, a 33-line electro-optic comb, and a 3-km seven-core MCF link, all 231 wavelength-core combinations are experimentally evaluated. The configured system corresponds to an aggregate net information rate of 11.55 Tbps, with all measured BERs below 2.4 × 10-2 and most channels achieving 1.8%-2.0% EVM.
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