• DOI:10.1109/JLT.2018.2875538
• Corpus ID: 55498908

High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL

@article{VanKerrebrouck2019HighSpeedPO,
  title={High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL},
  author={Joris Van Kerrebrouck and Xiaodan Pang and Oskars Ozolins and Rui Lin and Aleksejs Udalcovs and Lu Zhang and Haolin Li and Silvia Spiga and Markus-Christian Amann and Lin Gan and Ming Tang and Songnian Fu and Richard Schatz and Gunnar Jacobsen and Sergei Popov and Deming Liu and Weijun Tong and Guy Torfs and Johan Bauwelinck and Jiajia Chen and Xin Yin},
  journal={Journal of Lightwave Technology},
  year={2019},
  volume={37},
  pages={356-362}
}

• J. Van Kerrebrouck, X. Pang, +18 authors X. Yin
• Published 13 November 2018
• Physics
• Journal of Lightwave Technology

This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m single-mode vertical cavity surface emitting laser (SM-VCSEL) over multicore fiber with 7 cores over different distances. We have successfully generated up to 70 Gbaud 4-level pulse amplitude modulation (PAM-4) signals with a VCSEL in optical back-to-back, and transmitted 50 Gbaud PAM-4 signals over both 1-km dispersion-uncompensated and 10-km dispersion-compensated in each core, enabling a total data throughput of 700 Gbps over the 7-core fiber. Moreover, 56 Gbaud PAM-4 over 1-km have also been shown, whereby unfortunately not all cores provide the required 3.8 × 10<inline-formula><tex-math notation="LaTeX">$^{-3}$</tex-math></inline-formula> bit error rate (BER) for the 7% overhead-hard decision forward error correction (7% OH-HDFEC). The limited bandwidth of the VCSEL and the adverse chromatic dispersion of the fiber are suppressed with pre-equalization based on accurate end-to-end channel characterizations. With a digital postequalization, BER performance below the 7% OH-HDFEC limit is achieved over all cores. The demonstrated results show a great potential to realize high-capacity and compact short-reach optical interconnects for data centers.