研究目的
Investigating the performance of a convex-shaped fiber ring (CSFR)-based single-longitudinal-mode (SLM) erbium-doped fiber laser (EDFL) with ultra-narrow linewidth and high stability.
研究成果
The proposed CSFR-and-Sagnac-loop-based SLM EDFL exhibits ultra-narrow linewidth (840 Hz), high OSNR (63 dB), and extremely high stability (output power fluctuation <0.01 dB, central wavelength variation <0.01 nm), making it suitable for applications requiring stable and narrow-linewidth laser sources.
研究不足
The study is conducted at room temperature without violent vibration, which may not account for environmental variations affecting laser performance. The linewidth measurement is limited by the available single mode fiber delay line length.
1：Experimental Design and Method Selection:
The study employs a CSFR composed of two optical couplers and a Sagnac loop with unpumped erbium-doped fiber to achieve SLM operation in an EDFL.
2：Sample Selection and Data Sources:
The experiment uses a 2-m-long commercial EDF1 and a 6-m-long unpumped EDF2 as gain medium and saturable absorber, respectively.
3：List of Experimental Equipment and Materials:
Includes a 980-nm laser diode, wavelength division multiplexer, circulator, fiber Bragg grating, optical isolators, polarization controller, polarization beam splitter, and optical couplers.
4：Experimental Procedures and Operational Workflow:
The setup involves constructing the EDFL with the CSFR and Sagnac loop, measuring the linewidth, OSNR, and stability of the laser output.
5：Data Analysis Methods:
The linewidth is measured using a delayed self-heterodyne measurement system, and stability is monitored over short-term and long-term periods.
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optical coupler
Used to form the convex-shaped fiber ring (CSFR) and Sagnac loop in the EDFL setup.
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erbium-doped fiber
EDFC980-HP
Nufern
Used as the gain medium and saturable absorber in the EDFL.
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laser diode
Pumps the erbium-doped fiber to achieve lasing.
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wavelength division multiplexer
Combines the pump light with the signal light in the EDFL.
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circulator
Ensures unidirectional operation of the EDFL.
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fiber Bragg grating
Acts as a reflector and coarse mode filter in the EDFL.
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optical isolator
Suppresses undesired counter-propagating amplified spontaneous emission noise.
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polarization controller
Adjusts the polarization state of the light in the cavity.
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polarization beam splitter
Works as a mode filter and divides the light beam into two orthogonal linearly polarized light beams.
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optical spectrum analyzer
Q8384
Advantest
Measures the output wavelength and OSNR of the fiber laser.
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power meter
JW3208
Measures the stability of the output power of the EDFL.
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