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Electrical Engineering and Systems Science > Signal Processing

arXiv:1812.05536 (eess)
[Submitted on 13 Nov 2018]

Title:High-speed PAM4-based Optical SDM Interconnects with Directly Modulated Long-wavelength VCSEL

Authors:Joris Van Kerrebrouck, Xiaodan Pang, Oskars Ozolins, Rui Lin, Aleksejs Udalcovs, Lu Zhang, Haolin Li, Silvia Spiga, Markus-Christian Amann, Lin Gan, Ming Tang, Songnian Fu, Richard Schatz, Gunnar Jacobsen, Sergei Popov, Deming Liu, Weijun Tong, Guy Torfs, Johan Bauwelinck, Jiajia Chen, Xin Yin
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Abstract:This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-{\mu}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 has also been shown, whereby unfortunately not all cores provide the required 3.8 $\times$ 10 $^{-3}$ 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 post-equalization, 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.
Comments: 7 pages, accepted to publication in 'Journal of Lightwave Technology (JLT)
Subjects: Signal Processing (eess.SP); Networking and Internet Architecture (cs.NI)
Cite as: arXiv:1812.05536 [eess.SP]
  (or arXiv:1812.05536v1 [eess.SP] for this version)
  https://doi.org/10.48550/arXiv.1812.05536
Related DOI: https://doi.org/10.1109/JLT.2018.2875538

Submission history

From: Xiaodan Pang [view email]
[v1] Tue, 13 Nov 2018 09:46:34 UTC (1,074 KB)
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