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

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 $A(\omega )$ , $A(\omega + n\Omega _{m})$ 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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Informasi Detail

Judul Seri

IEEE JOURNAL OF QUANTUM ELECTRONICS; Vol.58 No.6 December 2022

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 1600523

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

FOURIER ANALYSIS
OPTICAL FILTERS
MODE-LOCKED LASER
OPTICAL FUNCTION GENERATOR
OPTICAL DARK PULSES

Info Detail Spesifik

DOI: 10.1109/JQE.2022.3210339

Pernyataan Tanggungjawab

Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

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