期刊
SCIENTIFIC REPORTS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep44314
关键词
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资金
- Russian Science Foundation [14-21-00110]
- EU Horizon Marie S.-Curie IF MINDFLY project
- Ministry of Higher Education Sultanate of Oman
- Marie-Curie Inter-national Research Staff Exchange Scheme TelaSens project, Research Executive Agency [269271]
- European Research Council through the FP7-IDEAS-ERC grant ULTRALASER
- Royal Academy of Engineering Fellowship (Graphlex)
- Programme: FP7-PEOPLE-IRSES
- Russian Science Foundation [14-21-00110] Funding Source: Russian Science Foundation
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 mu m 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 mu m region, which could not be supported by single-wall carbon nanotubes (SWNTs). The combination of the potential bandwidth resource around 2 mu m with the soliton molecule concept for encoding two bits of data per clock period opens exciting opportunities for data-carrying capacity enhancement.
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