Phase-sensitive QPSK channel phase quantization by amplifying the fourth-harmonic idler using counter-propagating Brillouin amplification

Ahmed Almaiman, Yinwen Cao, Amirhossein Mohajerin-Ariaei, Morteza Ziyadi, Peicheng Liao, Changjing Bao, Fatemeh Alishahi, Ahmad Fallahpour, Bishara Shamee, Youichi Akasaka, Tadashi Ikeuchi, Steven Wilkinson, Joseph D. Touch, Moshe Tur, Alan E. Willner

Research output: Contribution to journalArticlepeer-review

Abstract

We experimentally demonstrate all-optical phase-sensitive quantization of a 10–20 Gbaud quadrature phase-shift keying (QPSK) signal's phase without an active phase-locked loop (PLL) by utilizing Brillouin amplification (BA) to amplify the fourth-harmonic idler without path separation, allowing the pump, signal, third-harmonic idler and amplified fourth-harmonic idler to remain synchronized in the phase. We observe up to 65% reduction in phase noise and 4.6 dB gain at a bit-error rate (BER) of 10−4 over 36 min of continues operation.

Original languageEnglish
Pages (from-to)48-52
Number of pages5
JournalOptics Communications
Volume423
DOIs
StatePublished - 15 Sep 2018

Keywords

  • All-optical phase regeneration
  • Four-wave mixing
  • Phase-sensitive amplification
  • Wavelength conversion

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