Coherence Degradation in the Process of Supercontinuum Generation in an Optical Fiber

✍ Scribed by Masataka Nakazawa; Kohichi Tamura; Hirokazu Kubota; Eiji Yoshida

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 218 KB
• Volume: 4
• Category: Article
• ISSN: 1068-5200
• DOI: 10.1006/ofte.1998.0253

✦ Synopsis

Changes in coherence during the process of supercontinuum generation in Ž . Ž . a dispersion-shifted fiber DSF , a dispersion-flattened fiber DFF and a Ž . 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 s 1 soliton compression. This fiber is useful for ultra-high-speed communication.