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PAM-4 VCSEL driver with selective falling-edge pre-emphasis

Wouter Soenen UGent, Joris Lambrecht UGent, Xin Yin UGent, S. Spiga, M. -C. Amann, Geert Van Steenberge UGent, P. Bakopoulos and Johan Bauwelinck UGent (2018) ELECTRONICS LETTERS. 54(3).
abstract
Data centre optical links are migrating to four-level pulse amplitude modulation (PAM-4) as a method to extend the data rate while covering longer distances. Vertical-cavity surface-emitting lasers (VCSELs) enable the integration of low-power transmitters, but their non-linear and bias-dependent behaviour makes conventional feed-forward equalisation less effective. This Letter presents a 0.13 mu m SiGe BiCMOS PAM-4 driver that boosts the falling-edge to the bottom level through a selective pre-emphasis technique. Experiments at 25 GBd (50 Gb/s) reveal that adding selective pre-emphasis to a 4-tap equalised current driving a 20.6 GHz 1.5 mu m VCSEL, relaxes the critical PAM-4 link budget requirements by >1 dB at the KP4 forward error correction threshold of 2.2 x 10(-4). The potential of PAM-4 VCSEL transmitters can be significantly enhanced by including selective pre-emphasis to the equalisation topology while requiring minimal overhead.
Please use this url to cite or link to this publication:
@article{8550821,
  abstract     = {Data centre optical links are migrating to four-level pulse amplitude modulation (PAM-4) as a method to extend the data rate while covering longer distances. Vertical-cavity surface-emitting lasers (VCSELs) enable the integration of low-power transmitters, but their non-linear and bias-dependent behaviour makes conventional feed-forward equalisation less effective. This Letter presents a 0.13 mu m SiGe BiCMOS PAM-4 driver that boosts the falling-edge to the bottom level through a selective pre-emphasis technique. Experiments at 25 GBd (50 Gb/s) reveal that adding selective pre-emphasis to a 4-tap equalised current driving a 20.6 GHz 1.5 mu m VCSEL, relaxes the critical PAM-4 link budget requirements by {\textrangle}1 dB at the KP4 forward error correction threshold of 2.2 x 10(-4). The potential of PAM-4 VCSEL transmitters can be significantly enhanced by including selective pre-emphasis to the equalisation topology while requiring minimal overhead.},
  author       = {Soenen, Wouter and Lambrecht, Joris and Yin, Xin and Spiga, S. and Amann, M. -C. and Van Steenberge, Geert and Bakopoulos, P. and Bauwelinck, Johan},
  issn         = {0013-5194},
  journal      = {ELECTRONICS LETTERS},
  keyword      = {IBCN,surface emitting lasers,pulse amplitude modulation,BiCMOS integrated,circuits,forward error correction,computer centres,optical links,field effect MMIC,PAM-4 VCSEL driver,selective falling-edge,pre-emphasis,data centre optical links,four-level pulse amplitude,modulation,vertical-cavity surface-emitting lasers,low-power,transmitters,nonlinear behaviour,bias-dependent behaviour,feed-forward equalisation,silicon-germanium BiCMOS PAM-4 driver,selective pre-emphasis technique,4-tap equalised current,critical,PAM-4 link budget requirements,forward error correction threshold,equalisation topology,bit rate 50 Gbit,s,frequency 20,6 GHz},
  language     = {eng},
  number       = {3},
  pages        = {2},
  publisher    = {Inst Engineering Technology-iet},
  title        = {PAM-4 VCSEL driver with selective falling-edge pre-emphasis},
  url          = {http://dx.doi.org/10.1049/el.2017.3945},
  volume       = {54},
  year         = {2018},
}

Chicago
Soenen, Wouter, Joris Lambrecht, Xin Yin, S. Spiga, M. -C. Amann, Geert Van Steenberge, P. Bakopoulos, and Johan Bauwelinck. 2018. “PAM-4 VCSEL Driver with Selective Falling-edge Pre-emphasis.” Electronics Letters 54 (3).
APA
Soenen, W., Lambrecht, J., Yin, X., Spiga, S., Amann, M.-C., Van Steenberge, G., Bakopoulos, P., et al. (2018). PAM-4 VCSEL driver with selective falling-edge pre-emphasis. ELECTRONICS LETTERS, 54(3).
Vancouver
1.
Soenen W, Lambrecht J, Yin X, Spiga S, Amann M-C, Van Steenberge G, et al. PAM-4 VCSEL driver with selective falling-edge pre-emphasis. ELECTRONICS LETTERS. Hertford: Inst Engineering Technology-iet; 2018;54(3).
MLA
Soenen, Wouter, Joris Lambrecht, Xin Yin, et al. “PAM-4 VCSEL Driver with Selective Falling-edge Pre-emphasis.” ELECTRONICS LETTERS 54.3 (2018): n. pag. Print.