研究目的
Investigating the generation and characteristics of harmonic mode-locking in a bidirectional domain-wall dark-soliton fiber laser.
研究成果
The study successfully demonstrates the first experimental observation of high-order harmonic mode-locking in a bidirectional domain-wall soliton fiber laser. The results confirm that domain-wall solitons are an intrinsic feature of mode-locked lasers, similar to conventional bright solitons. This work provides new insights into the dynamics of vector solitons and has potential applications in optical communication and sensing systems.
研究不足
The study is limited to the observation of up to eighth-order harmonic mode-locking due to the available pump power. Higher-order HML could potentially be achieved with a larger power pump source.
1：Experimental Design and Method Selection:
The study involves the use of a bidirectional DWS fiber laser mode-locked by a piece of thulium-doped fiber as the saturable absorber. The laser's operation conditions, including pump power and polarization states, are adjusted to observe fundamental and harmonic mode-locking states.
2：Sample Selection and Data Sources:
The laser cavity includes a
3：5 m long erbium-doped fiber as the gain medium and a 8 mm long thulium-doped fiber as the saturable absorber. List of Experimental Equipment and Materials:
Equipment includes a 980 nm laser source, wavelength division multiplexer, polarization controller, optical coupler, photodiode, oscilloscope, and radio-frequency spectrograph.
4：Experimental Procedures and Operational Workflow:
The pump power is increased to initiate mode-locking, and the polarization state is adjusted to achieve different harmonic orders. The output is measured for pulse trains, optical spectra, and RF spectra.
5：Data Analysis Methods:
The pulse characteristics are analyzed based on the measured pulse trains, optical spectra, and RF spectra to determine the stability and performance of the mode-locked states.
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erbium-doped fiber
Used as the gain medium in the laser cavity.
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thulium-doped fiber
Applied as the saturable absorber for mode-locking.
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980 nm laser source
Pumps the erbium-doped fiber.
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wavelength division multiplexer
980 nm/1550 nm
Connects the pump source to the cavity.
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polarization controller
Tunes the polarization state in the cavity.
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optical coupler
10:90
Outputs the signals for measurement.
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photodiode
20 GHz
Monitors the pulse trains.
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oscilloscope
RTO1002
Visualizes the pulse trains.
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radio-frequency spectrograph
Agilent E4407B
Detects the frequency-domain signals.
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optical spectrum analyzer
Yokogawa AQ6370
Measures the output spectra of the formed DWSs.
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