研究目的
Investigating the switchable dual-wavelength mode-locked fiber laser using a Sagnac loop mirror for applications in wavelength-division-multiplexed communication systems, optical spectroscopy, biomedical imaging, and terahertz radiation generation.
研究成果
The study demonstrated a switchable dual-wavelength mode-locked fiber laser using Sagnac fiber loop mirror, achieving tunable single wavelength mode locking from ～1550 nm to ～1561 nm and stable dual-wavelength mode locking with central wavelengths of 1561.4 nm and 1551.1 nm. The laser's simplicity and stability suggest potential applications in systems requiring tunable single-wavelength mode-locked laser or dual-wavelength mode-locked lasers.
研究不足
The instability of the dual-wavelength mode locked fiber laser could be due to mechanical vibration of the laser cavity, noise caused by temperature fluctuations, long recovery time of the SESAM, and the fluctuation of the pump power.
1：Experimental Design and Method Selection:
The laser cavity consists of a semiconductor saturable absorber (SESAM), a 980/1550 wavelength division multiplexing (WDM), ～55 cm Erbium-doped fiber (EDF), a 10/90 optical coupler, and a Sagnac loop mirror. The Sagnac loop mirror includes a 50/50 optical coupler, a 10/90 optical coupler, two polarization controllers, and a piece of 0.5 m polarization maintaining fiber with birefringence of ～4.6 × 10?
2：5 m polarization maintaining fiber with birefringence of ～6 × 10?Sample Selection and Data Sources:
4. 2. Sample Selection and Data Sources: A 980 nm single mode laser diode with maximum pump power of 500 mW is used to pump the EDF through the WDM.
3：List of Experimental Equipment and Materials:
Optical spectral analyzer (OSA, Yokogawa AQ6375B), oscilloscope (OSC) combined with a 2 GHz photoelectric detector, and a 25 GHz radio frequency (RF) analyzer combined with a 45 GHz photoelectric detector.
4：Experimental Procedures and Operational Workflow:
The output of the mode-locked fiber laser was monitored and measured by the OSA, OSC, and RF analyzer.
5：Data Analysis Methods:
The separation of the neighboring transmission peaks of the Sagnac loop mirror is inversely proportional to its birefringence, calculated by the given formula.
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optical spectral analyzer
AQ6375B
Yokogawa
Monitoring and measuring the output of the mode-locked fiber laser
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oscilloscope
Monitoring the pulse trains in the time domain
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photoelectric detector
Detecting the pulse trains for the oscilloscope and RF analyzer
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radio frequency analyzer
Analyzing the RF spectra of the mode-locked fiber laser
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semiconductor saturable absorber
Acting as a mode-locker in the laser cavity
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wavelength division multiplexing
980/1550
Multiplexing the pump laser diode and the signal in the laser cavity
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Erbium-doped fiber
Acting as the gain medium in the laser cavity
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optical coupler
10/90
Coupling the light in the laser cavity
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polarization maintaining fiber
Providing periodic filtering effect in the Sagnac loop mirror
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laser diode
980 nm single mode
Pumping the Erbium-doped fiber
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