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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 35,
  • Issue 6,
  • pp. 1253-1259
  • (2017)

84-, 100-, and 107-GBd PAM-4 Intensity-Modulation Direct-Detection Transceiver for Datacenter Interconnects

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Abstract

We report on an ultrahigh-speed PAM-based IM/DD optical subsystem featuring compact signal generation and tractable digital-processing complexity. The proposed transceiver is based on two main technologies: an InP DHBT selector power DAC for electrical signal generation, and a complexity-optimized receiver processing chain. We show how the complexity of the feed-forward equalizer can be considerably reduced by stacking a <3-symbol memory sequence estimator. Finally, we experimentally demonstrate successful signal recovery for 107-GBd PAM-4 in back-to-back configuration, and after 500 m and 1 km of transmission over standard single-mode fiber for 100- and 84-GBd PAM-4 configuration, respectively. A power-budget margin above 2 dB is attained in all cases.

© 2017 IEEE

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