TY - JOUR
T1 - High-speed PAM4-based optical SDM interconnects with directly modulated long-wavelength VCSEL
AU - Van Kerrebrouck, Joris
AU - Pang, Xiaodan
AU - Ozolins, Oskars
AU - Lin, Rui
AU - Udalcovs, Aleksejs
AU - Zhang, Lu
AU - Li, Haolin
AU - Spiga, Silvia
AU - Amann, Markus Christian
AU - Gan, Lin
AU - Tang, Ming
AU - Fu, Songnian
AU - Schatz, Richard
AU - Jacobsen, Gunnar
AU - Popov, Sergei
AU - Liu, Deming
AU - Tong, Weijun
AU - Torfs, Guy
AU - Bauwelinck, Johan
AU - Chen, Jiajia
AU - Yin, Xin
N1 - Publisher Copyright:
© 1983-2012 IEEE.
PY - 2019/1/15
Y1 - 2019/1/15
N2 - 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 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 -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 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.
AB - 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 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 -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 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.
KW - 4-level pulse amplitude modulation (PAM-4)
KW - Direct detection
KW - digital signal processing (DSP)
KW - multicore fiber (MCF)
KW - spatial division multiplexing (SDM)
KW - vertical cavity surface emitting laser (VCSEL)
UR - http://www.scopus.com/inward/record.url?scp=85054661876&partnerID=8YFLogxK
U2 - 10.1109/JLT.2018.2875538
DO - 10.1109/JLT.2018.2875538
M3 - Article
AN - SCOPUS:85054661876
SN - 0733-8724
VL - 37
SP - 356
EP - 362
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 2
M1 - 8489953
ER -