%0 Journal Article %1 8489953 %A Van Kerrebrouck, J. %A Pang, X. %A Ozolins, O. %A Lin, R. %A Udalcovs, A. %A Zhang, L. %A Li, H. %A Spiga, S. %A Amann, M. %A Gan, L. %A Tang, M. %A Fu, S. %A Schatz, R. %A Jacobsen, G. %A Popov, S. %A Liu, D. %A Tong, W. %A Torfs, G. %A Bauwelinck, J. %A Chen, J. %A Yin, X. %D 2019 %J Journal of Lightwave Technology %K sendate sendate-ficus %N 2 %P 356-362 %R 10.1109/JLT.2018.2875538 %T High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL %U https://ieeexplore.ieee.org/document/8489953/ %V 37 %X This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-μm 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 10km 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 × 10-3 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 preequalization 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.

@article{8489953, abstract = {This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-μm 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 10km 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 × 10-3 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 preequalization 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.}, added-at = {2019-03-20T09:26:27.000+0100}, author = {{Van Kerrebrouck}, J. and {Pang}, X. and {Ozolins}, O. and {Lin}, R. and {Udalcovs}, A. and {Zhang}, L. and {Li}, H. and {Spiga}, S. and {Amann}, M. and {Gan}, L. and {Tang}, M. and {Fu}, S. and {Schatz}, R. and {Jacobsen}, G. and {Popov}, S. and {Liu}, D. and {Tong}, W. and {Torfs}, G. and {Bauwelinck}, J. and {Chen}, J. and {Yin}, X.}, biburl = {https://www.bibsonomy.org/bibtex/2a9ce8615b8ab146b4fc3049242c6756d/jonasmartensson}, doi = {10.1109/JLT.2018.2875538}, interhash = {586f5e2ee9ca41e95dd6a6bfbae1e3c5}, intrahash = {a9ce8615b8ab146b4fc3049242c6756d}, issn = {0733-8724}, journal = {Journal of Lightwave Technology}, keywords = {sendate sendate-ficus}, month = jan, number = 2, pages = {356-362}, timestamp = {2019-03-20T09:26:27.000+0100}, title = {High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL}, url = {https://ieeexplore.ieee.org/document/8489953/}, volume = 37, year = 2019 }