Applied Sciences (Feb 2020)

Unrepeatered 240-km 64-QAM Transmission Using Distributed Raman Amplification over SMF Fiber

  • P. Rosa,
  • G. Rizzelli,
  • X. Pang,
  • O. Ozolins,
  • A. Udalcovs,
  • M. Tan,
  • M. Jaworski,
  • M. Marciniak,
  • S. Sergeyev,
  • R. Schatz,
  • G. Jacobsen,
  • S. Popov,
  • J. D. Ania-Castañón

DOI
https://doi.org/10.3390/app10041433
Journal volume & issue
Vol. 10, no. 4
p. 1433

Abstract

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We present a theoretical and experimental investigation of unrepeatered transmission over standard single-mode fiber (SMF-28) using several schemes of distributed Raman amplification, including first, second, and dual order. In order to further extend the transmission distance, we utilize advanced bidirectional higher-order ultra-long Raman fiber laser-based amplification, where we use fiber Bragg gratings (FBGs) to reflect Stokes-shifted light from the secondary pumps. Our work demonstrates the possibility of transmission up to 240-km span length with a total span loss of 52.7 dB. Here, we use a 28-Gbaud signal using a 64-quadrature amplitude modulation (QAM) modulation format. Our results highlight the contribution of nonlinear compensation using digital back propagation in a digital signal processor (DSP) code at the receiver.

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