研究目的
Investigating the tunable single-longitudinal-mode fiber laser based on a chirped fiber Bragg grating for applications in high-resolution spectroscopy, microwave generation, optical fiber sensing, and optical communications system.
研究成果
A SLM fiber laser based on multi-sub-cavities formed by a CFBG is successfully demonstrated, offering a simple multi-sub-cavities structure and wide wavelength tunable range. Experimental results show a tunable SLM fiber laser with a linewidth of less than 8.5 kHz and an SMSR of larger than 50 dB in the whole tuning range from 1535 to 1565 nm.
研究不足
The fiber laser can maintain SLM operation in a relatively short time due to environmental disturbances. The stability could be improved by using polarization-maintaining fiber in the whole cavity.
1：Experimental Design and Method Selection:
The study proposes a SLM fiber laser based on multi-sub-cavities formed by a single CFBG inserted inside the laser loop to increase the longitudinal mode spacing.
2：Sample Selection and Data Sources:
The reflection spectrum of the CFBG is utilized, with a reflection of about
3：7% in a 55 nm bandwidth from 1510 to 1565 nm. List of Experimental Equipment and Materials:
Includes a semiconductor optical amplifier (SOA), an erbium-doped fiber amplifier (EDFA), isolators (ISOs), polarization controllers (PCs), a polarizer, a tunable optical band-pass filter (TOBF), and a CFBG.
4：Experimental Procedures and Operational Workflow:
The laser output is tuned by adjusting the center wavelength of the TOBF, and the SLM operation is confirmed by measuring the optical and RF spectra.
5：Data Analysis Methods:
The linewidth is measured using delayed self-heterodyne method, and the side-mode suppression ratio (SMSR) is evaluated.
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optical spectra analyzer
AQ6370D
Yokogawa
Measures the optical spectra of the SLM laser output
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electronic spectrum analyzer
N9020B
Keysight
Measures the RF spectrum to confirm SLM operation
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semiconductor optical amplifier
SOA
Provides gain in the laser cavity
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erbium-doped fiber amplifier
EDFA
Provides gain in the laser cavity
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isolators
ISOs
Ensures unidirectional operation in the laser cavity
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tunable optical band-pass filter
TOBF
Defines the wavelength tunable range in the laser cavity
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chirped fiber Bragg grating
CFBG
Forms sub cavities in the laser loop to increase the longitudinal mode spacing
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