研究目的
Investigating the optimization of wide-spectral mode-locking fiber laser carriers for free space optical communication.
研究成果
The optimization of wide-spectral mode-locking fiber laser carriers through a two-color pump scheme and fiber dispersion management significantly improves transmission performance in free space optical communication, demonstrating reduced pulse-to-pulse fluctuation and enhanced bandwidth.
研究不足
The study is limited to a simulated atmospheric turbulent channel and may require further validation in real-world conditions. The optimization method's effectiveness across different atmospheric conditions is not explored.
1：Experimental Design and Method Selection:
The experiment involves the introduction of a two-pulse pump scheme with fiber dispersion management to optimize wide-spectral mode-locking fiber laser carriers.
2：Sample Selection and Data Sources:
The carriers are tested in a 1km simulated atmospheric turbulent channel.
3：List of Experimental Equipment and Materials:
Includes a homemade active mode-locking fiber laser, single-mode fiber (SMF), Raman pump laser, erbium-doped fiber amplifier (EDFA), continuous wave (CW) source, optical coupler (OC), variable optical attenuator (VOA), dispersion-shifted fiber (DSF), highly nonlinear fiber (HNLF), optical spectrum analyzer (OSA), coarse wavelength demultiplexer (CWDM), Mach-Zehnder modulator (MZM), photodetector (PD), and a real-time oscilloscope.
4：Experimental Procedures and Operational Workflow:
The pump pulse is compressed and coupled with a CW source, amplified, and then passed through cascaded fibers for supercontinuum generation. The output is filtered, modulated, and transmitted through a simulated atmospheric turbulent channel.
5：Data Analysis Methods:
The performance is analyzed based on scintillation index (SI), eye pattern, and bit error rate (BER).
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continuous wave source
EXFO FLS-2800
EXFO
Provides a CW signal for coupling with the compressed pulse
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real-time oscilloscope
DPO72004C
Tektronix
Analyzes the demodulated signal
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active mode-locking fiber laser
homemade
Generates pump pulses for the experiment
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single-mode fiber
SMF
Used as gain medium in adiabatic soliton compression
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Raman pump laser
Injects in the counterpropagating direction for pulse compression
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erbium-doped fiber amplifier
EDFA
Amplifies the pump pulse
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optical coupler
OC
Couples the CW with the compressed pulse
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variable optical attenuator
VOA
Adjusts the output power of the optical amplifier
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dispersion-shifted fiber
DSF
Used in cascaded fiber for supercontinuum generation
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highly nonlinear fiber
HNLF
Used in cascaded fiber for supercontinuum generation
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optical spectrum analyzer
OSA
Displays the SC spectra
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coarse wavelength demultiplexer
CWDM
Filters the SC spectra
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Mach-Zehnder modulator
MZM
Loads RF signal on wide-spectral carriers
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photodetector
PD
Demodulates the optical signal
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