Ultrafast coherent optical transmission

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22 Citations (Scopus)


This paper presents recent progress toward the realization of ultrahigh-speed coherent optical transmission with a single-channel bit rate of more than 1 Tbit/s using ultrashort pulse technology and an advanced modulation format. We first describe Tbit/s optical time-division multiplexing (OTDM) transmission employing differential binary or quadrature phase shift keying. We present our recent demonstrations of single-polarization 640-Gb/s differential phase-shift keying and 1.28-Tb/s differential quadrature phase-shift keying transmissions over 525 km, which employ an ultrafast optical Fourier transformation technique. We then focus on coherent optical transmission using quadrature amplitude modulation (QAM) with a multiplicity of 512 that enables us to achieve an ultrahigh spectral efficiency of more than 10 b/s/Hz. Finally, we demonstrate a novel ultrahigh-speed, spectrally efficient coherent pulse transmission combining OTDM and QAM. A 400Gb/s, 32 RZ/QAM signal was successfully transmitted over 225km on a single carrier at 10 Gsymbol/s 4-OTDM.

Original languageEnglish
Article number6145139
Pages (from-to)363-376
Number of pages14
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number1
Publication statusPublished - 2012


  • Differential phase-shift keying (DPSK)
  • differential quadrature phase-shift keying (DQPSK)
  • optical time-division multiplexing (OTDM)
  • quadrature amplitude modulation (QAM)
  • ultrahigh-speed transmission
  • ultrashort optical pulse

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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