Ultra-long-haul 40-Gbit/s-based DWDM transmission using optically prefiltered CS-RZ signals

Takehiro Tsuritani*, Akira Agata, Itsuro Morita, Noboru Edagawa, Shigeyuki Akiba

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Ultra-long-haul 42.7-Gbit/s-based dense wavelength-division multiplexing (DWDM) transmission using optically prefiltered carrier-suppressed return-to-zero (CS-RZ) signal has been experimentally investigated. First, we have numerically and experimentally evaluated the impact of 3-dB bandwidth and filter detuning of bandlimiting filters on the 42.7-Gbit/s CS-RZ signal in back-to-back condition. We found that the asymmetrically filtered CS-RZ signal had a great potential for ultra-DWDM applications. Next, we have numerically and experimentally investigated the basic transmission characteristics of a 45-GHz-wide prefiltered CS-RZ signal, such as the robustness against residual dispersion, nonlinear effects, and PMD, and have confirmed that the prefiltered CS-RZ signal had less tolerance against fiber nonlinearity than an unfiltered CS-RZ signal. Finally, we have experimentally investigated the optimum filtering condition for 65- or 45-GHz-wide prefiltered CS-RZ signals in the ultra-long-haul DWDM transmission and have conducted the 70- and 50-GHz spaced 32 × 42.7 Gbit/s transmission using prefiltered CS-RZ signals. Through these experiments, we have confirmed the effectiveness of prefiltered CS-RZ signal ultra-long-haul DWDM transmission.

Original languageEnglish
Pages (from-to)403-411
Number of pages9
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number2
Publication statusPublished - 2004 Mar
Externally publishedYes


  • Carrier-suppressed return-to-zero
  • Optical fiber communication
  • Optical filtering
  • Spectral efficiency
  • Ultra-long-haul transmission
  • Wavelength-division multiplexing

ASJC Scopus subject areas

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


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