Experiments on Generation of Various Dark and Bright Pulses From an FM Mode-Locked Laser

Masataka Nakazawa; Masato Yoshida; Toshihiko Hirooka

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Experiments on Generation of Various Dark and Bright Pulses From an FM Mode-Locked Laser

机译：Experiments on Generation of Various Dark and Bright Pulses From an FM Mode-Locked Laser

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We experimentally describe the generation of various dark and bright pulses from an FM mode-locked laser with, for example, Gaussian, secant hyperbolic (sech), double-sided exponential, rectangular, parabolic, triangular, Nyquist, and even tangent hyperbolic (tanh) shapes. The experiments were carried out by constructing a 20 GHz actively FM mode-locked erbium fiber laser. Since a continuous wave (CW) offset is needed to form a dark pulse, which can be considered the sum of a negative pulse and a rectangular pulse in one time slot. Therefore, a specific filter, which is installed in the laser cavity, consists of $A(omega )$ , $A(omega + nOmega _{m})$ with $n=-infty sim +infty $ and a sinc function spectrum that is newly introduced as a Fourier transformation of a rectangular pulse for describing the CW offset. Here, $Omega _{m}$ is the angular modulation frequency. We also generated a positive bright pulse that consists of a positive pulse with a positive CW offset. The generated optical pulses agreed well with the theory, where the spectral profiles even below −40 dB coincided well with the numerical profiles. We could also generate parabolic and triangular dark pulses in the intensity expression. Finally, we demonstrated tanh $(t/T)$ pulse generation, which is an odd function and well known as a dark soliton solution of the nonlinear Schrödinger equation. This pulse was generated by changing the odd function into an even function by cascading positive and negative tanh $(t/T)$ pulses at half the repetition rate.

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《IEEE Journal of Quantum Electronics: A Publication of the IEEE Quantum Electronics and Applications Society》 |2022年第6期|1600523-1-1600523-23|共23页
作者
Masataka Nakazawa; Masato Yoshida; Toshihiko Hirooka;
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作者单位

International Research Institute of Disaster Science, Tohoku University, Sendai-shi;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类基础理论;
关键词
Mode-locked laser; optical function generator; optical dark pulses; optical filters; Fourier analysis; Frequency modulation; Laser mode locking; Optical fiber dispersion; Optical fiber devices; Erbium-doped fiber lasers; Optical fiber filters; Optical fiber amplifiers;

Experiments on Generation of Various Dark and Bright Pulses From an FM Mode-Locked Laser

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