Coherence degradation in the process of supercontinuum generation in an optical fiber

Masataka Nakazawa, Kohichi Tamura, Hirokazu Kubota, Eiji Yoshida

Research output: Contribution to journalArticlepeer-review

124 Citations (Scopus)


Changes in coherence during the process of supercontinuum generation in a dispersion-shifted fiber (DSF), a dispersion-flattened fiber (DFF) and a dispersion-decreasing fiber (DDF) have been investigated in detail for the first time. It is shown that both time and frequency coherence are greatly degraded in DSF and DFF. This is due to the four wave mixing effect caused by self-phase modulation and group velocity dispersion in the presence of amplified spontaneous emission. Such a light pulse may be unsuitable for long-distance, high-speed transmission because it contains timing jitter and amplitude fluctuations. On the other hand, DDF can maintain its coherence as the spectral broadening occurs coherently through adiabatic N = 1 soliton compression. This fiber is useful for ultra-high-speed communication.

Original languageEnglish
Pages (from-to)215-223
Number of pages9
JournalOptical Fiber Technology
Issue number2
Publication statusPublished - 1998 Apr


  • Coherence
  • Four wave mixing
  • Soliton
  • Supercontinuum


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