Open AccessExperimental demonstration on triangular-shaped pulse train generation based on harmonic fitting
Author(s) -
Jing Li,
Tigang Ning,
Pei Li,
Jian Wei,
Zheng Jingjing,
You Hai-Dong,
Jian Sun,
Yiqun Wang,
Chao Li
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.154210
Subject(s) - optics , harmonics , modulation index , modulation (music) , dispersion (optics) , signal (programming language) , materials science , harmonic , pulse (music) , pulse width modulation , power (physics) , physics , acoustics , computer science , detector , quantum mechanics , voltage , programming language
We demonstrate an approach for triangular-shaped pulse train generation experimentally based on harmonic fitting. The operation principle is that a Mach-Zehnder modulator is firstly employed to suppress modulation of the optical carrier. Thus a periodically variable lightwave can be obtained at the output. Then the signal is coupled into a section of dispersive fiber. Due to the dispersion-induced power fading, the undesired 4th order harmonics in the optical intensity can be fully removed. By adjusting modulation index to an optimum value (m=2.305), the generated harmonics of the optical intensity can be made corresponding to the Fourier components of typical periodic triangular pulses. Finally, the triangular-shaped pulse train at a repetition rate two times of the driving frequency can be obtained. In the experiments, 19.724 Gb/s and 15.356 Gb/s triangular-shaped pulse trains are generated by using 9.862 GHz and 7.678 GHz driving signals respectively. Besides, the repetition rate can be switched to another value by using a different fiber dispersion ( 2L). It is found that the experimental data agree well with theoretical results.