Simultaneous QPSK-to-2 × BPSK wavelength and Modulation Format Conversion in PPLN

Francesco Da Ros, Kjeld Dalgaard, Yutaka Fukuchi, Jing Xu, Michael Galili, Christophe Peucheret

Research output: Contribution to journalJournal articleResearchpeer-review


Phase-sensitive cascaded second-harmonic generation and difference-frequency generation in a periodically poled lithium niobate waveguide allow converting two orthogonal quadratures of an optical field to different wavelengths, thus enabling simultaneous quadrature phase-shift keying-to- \(2\times \) binary phase-shift keying modulation format and wavelength conversions. Static phase-sensitive extinction ratios above 20 dB are obtained for both quadratures, resulting in error-free dynamic operation with low penalty (BER (10-9) ) at 10 Gbaud.
Original languageEnglish
JournalIEEE Photonics Technology Letters
Issue number12
Pages (from-to)1207-1210
Publication statusPublished - 2014


  • Phase shift keying
  • Nonlinear optics
  • Periodically poled lithium niobate (PPLN)
  • Phase-sensitive amplification

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