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High-speed PAM4-based optical SDM interconnects with directly modulated long-wavelength VCSEL

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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 have also been shown, whereby unfortunately not all cores provide the required 3.8 x 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.
Keywords
Direct detection, digital signal processing (DSP), multicore fiber, (MCF), spatial division multiplexing (SDM), vertical cavity surface, emitting laser (VCSEL), 4-level pulse amplitude modulation (PAM-4)

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Citation

Please use this url to cite or link to this publication:

Chicago
Van Kerrebrouck, Joris, Xiaodan Pang, Oskars Ozolins, Rui Lin, Aleksejs Udalcovs, Lu Zhang, Haolin Li, et al. 2019. “High-speed PAM4-based Optical SDM Interconnects with Directly Modulated Long-wavelength VCSEL.” Journal of Lightwave Technology 37 (2): 356–362.
APA
Van Kerrebrouck, J., Pang, X., Ozolins, O., Lin, R., Udalcovs, A., Zhang, L., Li, H., et al. (2019). High-speed PAM4-based optical SDM interconnects with directly modulated long-wavelength VCSEL. JOURNAL OF LIGHTWAVE TECHNOLOGY, 37(2), 356–362. Presented at the Optical Fiber Communications Conference and Exposition (OFC) .
Vancouver
1.
Van Kerrebrouck J, Pang X, Ozolins O, Lin R, Udalcovs A, Zhang L, et al. High-speed PAM4-based optical SDM interconnects with directly modulated long-wavelength VCSEL. JOURNAL OF LIGHTWAVE TECHNOLOGY. Piscataway: Ieee-inst Electrical Electronics Engineers Inc; 2019;37(2):356–62.
MLA
Van Kerrebrouck, Joris et al. “High-speed PAM4-based Optical SDM Interconnects with Directly Modulated Long-wavelength VCSEL.” JOURNAL OF LIGHTWAVE TECHNOLOGY 37.2 (2019): 356–362. Print.
@article{8607514,
  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 have also been shown, whereby unfortunately not all cores provide the required 3.8 x 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.},
  author       = {Van Kerrebrouck, Joris and Pang, Xiaodan and Ozolins, Oskars and Lin, Rui and Udalcovs, Aleksejs and Zhang, Lu and Li, Haolin and Spiga, Silvia and Amann, Markus-Christian and Gan, Lin and Tang, Ming and Fu, Songnian and Schatz, Richard and Jacobsen, Gunnar and Popov, Sergei and Liu, Deming and Tong, Weijun and Torfs, Guy and Bauwelinck, Johan and Chen, Jiajia and Yin, Xin},
  issn         = {0733-8724},
  journal      = {JOURNAL OF LIGHTWAVE TECHNOLOGY},
  language     = {eng},
  location     = {San Diego, CA},
  number       = {2},
  pages        = {356--362},
  publisher    = {Ieee-inst Electrical Electronics Engineers Inc},
  title        = {High-speed PAM4-based optical SDM interconnects with directly modulated long-wavelength VCSEL},
  url          = {http://dx.doi.org/10.1109/JLT.2018.2875538},
  volume       = {37},
  year         = {2019},
}

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