研究目的
Investigating the generation of a wide-spectrum pulsed fiber laser using supercontinuum generated from a narrow pulse width fiber laser pumped into a high nonlinear fiber, focusing on the stability of the laser in different dispersion regions.
研究成果
The study successfully demonstrated a wide-spectrum pulsed fiber laser with a pulse width of 7.95ps and a repetition frequency of 4GHz, using SC generated from a HNLF. It was found that the anomalous dispersion region near the zero dispersion wavelength provides better stability for the wide-spectrum pulses. The research highlights the potential of using such lasers in applications requiring broad spectrum range and good stability.
研究不足
The study is limited by the specific parameters of the experimental setup, such as the length and properties of the HNLF, the pump wavelengths, and the power levels used. The stability and quality of the wide-spectrum pulses are also influenced by the dispersion characteristics of the fiber and the nonlinear effects involved.
1:Experimental Design and Method Selection:
The experiment involves generating a wide-spectrum pulsed fiber laser by pumping a high nonlinear fiber with a narrow pulse width laser. The study focuses on the effects of different pump wavelengths on the supercontinuum generation and the stability of the resulting wide-spectrum pulses.
2:Sample Selection and Data Sources:
The experiment uses a 800m high nonlinear fiber with a zero dispersion wavelength of 1550nm, pumped by short pulse lasers at wavelengths of 1540nm, 1550nm, and 1565nm.
3:List of Experimental Equipment and Materials:
Distributed feedback laser (DFB, EXFO FLS2800), Mach-Zehnder modulator (MZM), arbitrary waveform generator (AWG, Keysight M9502A), microwave amplifier (MA), Raman pump, single mode fiber (SMF), Erbium-doped optical fiber amplifier (EDFA), isolator (ISO), highly nonlinear fiber (HNLF), coarse wavelength division multiplexer (CWDM), optical spectrum analyzer (OSA, YOKOGAWA AQ6375), optical pulse analyzer (OPA, Coherent solutions HR150), photo-detector (PD), oscilloscope (OSC, Tektronix DPO72004C).
4:Experimental Procedures and Operational Workflow:
The experiment involves modulating a DFB laser with a MZM driven by a 4GHz pulse signal, amplifying the signal with an EDFA, compressing the pulse width in a SMF with Raman pump, and then pumping the compressed pulse into the HNLF to generate SC. The SC is then filtered to obtain wide-spectrum pulses, which are analyzed for their spectral and temporal characteristics.
5:Data Analysis Methods:
The spectral characteristics of the SC and wide-spectrum pulses are analyzed using an OSA, while the temporal characteristics are analyzed using an OPA and observed on an OSC.
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Optical spectrum analyzer
AQ6375
YOKOGAWA
Observing the output spectrum of SC and wide spectrum.
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Oscilloscope
DPO72004C
Tektronix
Observing the waveform.
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Distributed feedback laser
FLS2800
EXFO
Generating tunable laser light for the experiment.
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Arbitrary waveform generator
M9502A
Keysight
Generating a 4GHz pulse signal to drive the MZM.
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Mach-Zehnder modulator
MZM
Modulating the laser light.
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Microwave amplifier
MA
Amplifying the microwave signal to drive the MZM.
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Raman pump
Injecting power into the SMF for pulse compression.
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Single mode fiber
SMF
Used for pulse compression.
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Erbium-doped optical fiber amplifier
EDFA
Amplifying the optical signal.
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Highly nonlinear fiber
HNLF
Generating supercontinuum.
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Coarse wavelength division multiplexer
CWDM
Filtering out wide-spectrum pulsed laser.
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Optical pulse analyzer
HR150
Coherent solutions
Analyzing generated pulses.
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Photo-detector
PD
Detecting the waveform.
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