研究目的
Investigating the generation of three types of temporal solitons (conservative soliton, dispersion-managed soliton, and dissipative soliton) in a thulium-doped ?ber laser using single-wall carbon nanotubes saturable absorber.
研究成果
The proposed SWNTs mode-locked ?ber soliton laser can emit three types of solitons by adjusting the cavity dispersion. The spectral bandwidth varies with the change of dispersion, revealing the relationship between operating regime and dispersion in the 2 μm region.
研究不足
The study is limited to the wavelength of ～2 μm and the use of single-wall carbon nanotubes saturable absorber. The complexity of the system increases with the addition of free-space elements.
1：Experimental Design and Method Selection:
The study involves adjusting the dispersion design in the laser cavity to generate three types of solitons. A segment of dispersion compensation ?ber (DCF) is inserted into the cavity to provide net normal dispersion.
2：Sample Selection and Data Sources:
The thulium-doped ?ber serves as the gain medium. The dispersion is changed by reducing anomalous-dispersion ?ber in the cavity.
3：List of Experimental Equipment and Materials:
Includes a homemade Erbium-doped ?ber ampli?er (EDFA), wavelength-division multiplexer (WDM), polarization insensitive isolator (PI-ISO), polarization controller (PC), and single walled carbon nanotube (SWNTs) saturable absorber.
4：Experimental Procedures and Operational Workflow:
The net cavity dispersion was gradually tuned by shortening the single mode ?ber (SMF) in the cavity. The characteristics of output pulses were measured using an optical spectrum analyzer, an InGaAs photodetector, and a real-time digital storage oscilloscope.
5：Data Analysis Methods:
The relationship between spectral bandwidth and cavity dispersion was analyzed.
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optical spectrum analyzer
AQ6375
Yokogawa
To measure the characteristics of output pulses
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real-time digital storage oscilloscope
RTO2044
Rohde & Schwarz
To measure the characteristics of output pulses
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Erbium-doped ?ber ampli?er
EDFA
homemade
To pump the gain ?ber
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wavelength-division multiplexer
WDM
To emit continuous wave with the central wavelength of 1570 nm
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dispersion compensation ?ber
DCF
Nufern, UHNA4
To provide positive dispersion
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polarization insensitive isolator
PI-ISO
To enforce the light to propagate clockwise
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single mode ?ber
SMF
Part of the laser cavity
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single walled carbon nanotube
SWNTs
Saturable absorber
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polarization controller
PC
To adjust the polarization state of light
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thulium-doped ?ber
TDF
Nufern
Gain medium
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InGaAs photodetector
To measure the characteristics of output pulses
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