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Use of external optical feedback to stabilize multimode hopping and reduce intensity noise in long-wavelength semiconductor laser

机译：外部光学反馈的使用稳定多模跳跃并降低长波长半导体激光器中的强度噪声

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摘要

We report on the possibility of applying optical feedback (OFB) from a short external cavity to change the multimode hopping oscillation in long-wavelength semiconductor laser to single-mode oscillation. We characterize the influence of OFB on the modal oscillations and the associated noise spectrum of the multimode laser. The study is based on a modified time-delay multimode rate-equation model of the laser that includes mechanisms of spectral gain suppression along with OFB induced due to multiple reflections by an external reflector. The study is applied to 1.55 μm-InGaAsP laser that exhibits multimode hopping in its solitary version and supports wide bandwidth. The noise is evaluated in terms of the relative intensity noise. We show that strong OFB changes impact of the asymmetric gain suppression on the mode structure of the laser so that it changes the side mode suppression ratio (SMSR) and induces jumping of the strongest modes to longer or shorter wavelengths in random-like fashion. The change of SMSR of the laser occurs mainly when strong OFB induces multiperiodic and chaos oscillations. We specify the ranges of OFB over which SMO is induced. The low-frequency noise is lowest when the laser maintains CW operation or exhibits period-1 oscillations, while it is maximized when the laser dynamics are chaotic.
机译：我们报告了从短外腔中施加光学反馈（OFB）以将多模跳跃振荡在长波长半导体激光器中改变为单模振荡。我们表征了OFB对模态振荡的影响以及多模激光的相关噪声谱。该研究基于激光器的修改时间延迟多模率方程式模型，包括由于外部反射器的多个反射而引起的频谱增益抑制机制。该研究适用于1.55μm-ingaAsp激光器，在其孤独的版本中展示多模跳跃并支持宽带宽。根据相对强度噪声评估噪声。我们表明，强大的OFB变化了不对称增益抑制对激光模式结构的影响，使得它改变侧模抑制比（SMSR），并诱导最强模式以随机方式更长或更短的波长跳跃。激光的SMSR的变化主要在强烈的OFB诱导多周周性和混沌振荡时发生。我们指定了OFB的范围，诱导了SMO。当激光器保持CW操作或展示时段-1振荡时，低频噪声最低，而当激光动力学是混乱的时，它最大化。

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  • 来源
    《Optical and quantum electronics》 |2021年第5期|207.1-207.17|共17页
  • 作者

    Moustafa Ahmed; Ahmed Bakry; Ahmed Alshahrie; Hamed Dalir;

  • 作者单位

    Department of Physics Faculty of Science King Abdulaziz University 80203 Jeddah 21589 Saudi Arabia;

    Department of Physics Faculty of Science King Abdulaziz University 80203 Jeddah 21589 Saudi Arabia;

    Department of Physics Faculty of Science King Abdulaziz University 80203 Jeddah 21589 Saudi Arabia;

    Department of Electrical and Computer Engineering George Washington University Washington DC 20052 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Semiconductor laser optical feedback; Noise; Multimode hopping;

    机译：半导体激光光学反馈;噪音;多模跳跃;

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