Modulation instability of femtosecond pulses in fibres with slowly decreasing dispersion

• 来源期刊: 中国物理（英文版）
• 学科: 物理学
• 关键词: modulation instability ultrashort pulses generation fibres with slowly decreasing disper-sion third-order dispersion
• 年，卷（期）: 2002,（1）
• 页码范围: 39-43
• 页数: 5页
• 分类号: O4
• 语种: 英文

摘要

In this paper, we investigate the modulation instability for generating femtosecond pulses in fibres with slowlydecreasing dispersion. Higher-order dispersion and higher-order nonlinear effects are taken into account when thecontinuous wave or quasi-continuous wave evolves into sub-picosecond and femtosecond pulses by modulation instabilityin the optical fibres. Our research results show that the gain spectrum of the dispersion-decreasing fibres is much widerthat in conventional fibres.The third-order dispersion effect has no contribution to gain spectrum, while thethanself-steepening effect reduces themaximum value and gain bandwidth, and the Raman self-scattering effect widens theextent to which the modulation instability occurs.