研究目的
Demonstrating a stable dual-wavelength pulsed output from a praseodymium doped fluoride fiber laser using intensity-dependent transmission and loss due to the cavity birefringence.
研究成果
A dual-wavelength PDFFL with pulsed output using the NPR technique for intensity-dependent loss is experimentally demonstrated. The laser provides emission at 1.3 μm, with potential applications in multi-dimensional optical code-division multiple-access systems and metrology.
研究不足
The pulse width profile could not be measured using an autocorrelator due to its higher limit being in the femtosecond region, thus unable to detect pulses in sub-nanosecond region.
1：Experimental Design and Method Selection:
The experiment utilizes a praseodymium doped fluoride fiber laser setup with a polarization controller—single-mode-fiber/praseodymium doped fluoride fibers—polarization controller (PC-SMF/PDFF-PC) assembly for intensity-dependent loss and nonlinear polarization rotation (NPR) effect.
2：Sample Selection and Data Sources:
A 10 m long PDFF with a dopant concentration of 2250 ppm is used.
3：List of Experimental Equipment and Materials:
Includes a 1020 nm laser diode, wavelength division multiplexer, polarization sensitive isolator, 500 m long SMF-28, and a 90/10 coupler.
4：Experimental Procedures and Operational Workflow:
The setup involves pumping the PDFF, adjusting polarization controllers for different polarization states, and monitoring the output with an optical spectrum analyzer, oscilloscope, and RF spectrum analyzer.
5：Data Analysis Methods:
The output is analyzed for wavelength spacing, bandwidth, pulse width, and repetition rate.
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laser diode
1020 nm
Pump power source
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wavelength division multiplexer
1020/1310 nm
Combines pump power with the signal
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polarization sensitive isolator
Ensures unidirectional propagation of light and acts as a polarizer
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single mode fibers
SMF-28
Provides nonlinearity in the cavity
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optical spectrum analyzer
Monitors the output spectrum
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oscilloscope
Monitors the output pulse train
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RF spectrum analyzer
Analyzes the RF spectrum of the generated output
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