Double-wall carbon nanotube hybrid mode-locker in tm-doped fibre laser: A novel mechanism for robust bound-state solitons generation

Maria Chernysheva, Anastasia Bednyakova, Mohammed Al Araimi, Richard C.T. Howe, Guohua Hu, Tawfique Hasan, Alessio Gambetta, Gianluca Galzerano, Mark Rümmeli, Aleksey Rozhin

Результат исследования: Научные публикации в периодических изданияхстатья

38 Цитирования (Scopus)

Аннотация

The complex nonlinear dynamics of mode-locked fibre lasers, including a broad variety of dissipative structures and self-organization effects, have drawn significant research interest. Around the 2 μm band, conventional saturable absorbers (SAs) possess small modulation depth and slow relaxation time and, therefore, are incapable of ensuring complex inter-pulse dynamics and bound-state soliton generation. We present observation of multi-soliton complex generation in mode-locked thulium (Tm)-doped fibre laser, using double-wall carbon nanotubes (DWNT-SA) and nonlinear polarisation evolution (NPE). The rigid structure of DWNTs ensures high modulation depth (64%), fast relaxation (1.25 ps) and high thermal damage threshold. This enables formation of 560-fs soliton pulses; two-soliton bound-state with 560 fs pulse duration and 1.37 ps separation; and singlet+doublet soliton structures with 1.8 ps duration and 6 ps separation. Numerical simulations based on the vectorial nonlinear Schrodinger equation demonstrate a transition from single-pulse to two-soliton bound-states generation. The results imply that DWNTs are an excellent SA for the formation of steady single- and multi-soliton structures around 2 μm region, which could not be supported by single-wall carbon nanotubes (SWNTs). The combination of the potential bandwidth resource around 2 μm with the soliton molecule concept for encoding two bits of data per clock period opens exciting opportunities for data-carrying capacity enhancement.

Язык оригиналаанглийский
Номер статьи44314
Страницы (с-по)44314
Число страниц11
ЖурналScientific Reports
Том7
DOI
СостояниеОпубликовано - 13 мар 2017

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