Kramers-Kronig relation based direct detection for unrepeated long-haul lightwave transmission

DOI Web Site 6 References Open Access
  • Tsukui Enzo
    Graduate School of Science and Technology, Tokyo University of Science
  • Toba Kentaro
    Graduate School of Science and Technology, Tokyo University of Science
  • Fujita Takaha
    Graduate School of Science and Technology, Tokyo University of Science
  • Sampath K.I. Amila
    Graduate School of Science and Technology, Tokyo University of Science
  • Maeda Joji
    Graduate School of Science and Technology, Tokyo University of Science

Abstract

<p>We numerically study transmission limitations of an unrepeated optical link using Kramers-Kronig (KK) relation-based direct detection. The transmission distance is limited by the thermal noise of the optical front-end and the signal distortions caused by fiber nonlinearity in optical amplifier-free transmission and by amplified spontaneous emission (ASE) noise and fiber nonlinearities when pre-amplification is enabled at the receiver. The transmission limits of QPSK, 16-QAM, and 64-QAM modulation formats in optical amplifier-free 25-GBaud transmission can be extended from 109, 80, and 52 km to 186, 134, and 90 km by enabling pre-amplification at the receiver, respectively.</p>

Journal

  • IEICE Communications Express

    IEICE Communications Express 10 (8), 516-521, 2021-08-01

    The Institute of Electronics, Information and Communication Engineers

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