研究目的
Demonstrating a Q-switched erbium-doped fiber laser (EDFL) based on large diameter coreless fiber without intra-cavity tuning element for the first time.
研究成果
Stable Q-switched pulses were obtained for input pump powers from 188 to 343 mW. At an input pump power of 343 mW, stable Q-switched pulses with a repetition rate of 73.3 kHz, pulse energy of 50.9 nJ, and pulse duration of 3.5 μs were obtained. This novel modulation mechanism can be used to obtain Q-switched all-fiber lasers at any wavelengths, where the transmission of the SNCFS fiber device increases with the increased laser power density.
研究不足
The study focuses on the C-band region and does not explore other wavelength regions. The performance is compared with earlier published work which used MMF as a SA for Er/Yb co-doped fiber laser, indicating potential areas for optimization in terms of pulse duration and repetition rate.
1：Experimental Design and Method Selection:
The modulation device is fabricated by incorporating a small piece of large diameter coreless fiber (NCF) between two SMFs with 0 dB insertion loss.
2：Sample Selection and Data Sources:
A single mode fiber –coreless fiber –single mode fiber (SNCFS) structure was employed as a passive Q-switcher.
3：List of Experimental Equipment and Materials:
Includes erbium-doped fiber (EDF), wavelength division multiplexer (WDM), diode laser, polarization independent isolator (ISO), optical coupler (OC), coreless fiber (NCF), fusion splicer, optical spectrum analyzer, photodetector, and oscilloscope.
4：Experimental Procedures and Operational Workflow:
The SA (SNCFS) MMI device is fabricated by splicing 10 cm of NCF between two commercial SMFs. The output spectrum is measured with an optical spectrum analyzer. The output pulses train are monitored using a photodetector connected to an oscilloscope.
5：Data Analysis Methods:
The linear transmission of the proposed MMI device is experimentally investigated using an amplified spontaneous emission (ASE) source.
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coreless fiber
FG125LA
Thorlabs
Saturable absorber in the SNCFS structure
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fusion splicer
FSM-60S
Fujikura
Splicing optical individual parts of the ring EDFL cavity
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optical spectrum analyzer
AQ6370C
Yokogawa
Measuring the output spectrum
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oscilloscope
DPO 3052
Tektronix
Connected to photodetector for monitoring
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amplified spontaneous emission source
SLD 1550s-A1
Thorlabs
Investigating the linear transmission of the proposed MMI device
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erbium-doped fiber
ER80-4/125
Liekki
Active medium in the fiber laser
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wavelength division multiplexer
Pumping the EDF via 980/1550 nm
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diode laser
Pump source
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polarization independent isolator
Allowing unidirectional laser circulation inside the cavity and preventing back reflection
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optical coupler
Allowing 90% feedback ratio and 10% output ratio
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photodetector
Thorlabs
Monitoring the output pulses train
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