研究目的
Investigating the switchable dual-wavelength erbium-doped fiber laser with high OSNR and stability using PM-FBG and CFBG.
研究成果
The proposed EDFL can operate in stable dual-wavelength or single-wavelength lasing mode with high OSNR and stability. The wavelength and power fluctuations are minimal, and the laser shows potential for photonic generation of microwave signals.
研究不足
Higher performances in output power, efficiency, and OSNR could be achieved by optimizing the laser cavity design. Future work will focus on achieving single-longitudinal-mode operation with ultra-narrow linewidth.
1：Experimental Design and Method Selection:
The laser cavity includes a 7 m long EDF pumped by a 980 nm LD through a WDM, a PC to rotate the light SOP, a PM-FBG to provide two reflection wavelengths with orthogonal SOPs, and a CFBG to form a linear laser cavity. The output is monitored by an OSA.
2：Sample Selection and Data Sources:
The PM-FBG and CFBG are used as filters. The PM-FBG was fabricated using a uniform phase mask.
3：List of Experimental Equipment and Materials:
EDF, 980 nm LD, WDM, PC, PM-FBG, CFBG, OC, OSA.
4：Experimental Procedures and Operational Workflow:
The laser operates in dual-wavelength or single-wavelength mode by adjusting the PC. The output is monitored for OSNR, wavelength, and power fluctuations.
5：Data Analysis Methods:
The OSA measures the optical spectrum, and a power meter measures power fluctuations.
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erbium-doped fiber
gain medium of optical amplifying
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laser diode
980 nm
pump source
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wavelength division multiplexer
980/1550 nm
combines pump and signal wavelengths
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polarization controller
rotates the light SOP to balance the gain and loss of different wavelengths
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polarization maintaining fiber Bragg grating
PM-FBG
provides two reflection wavelengths with orthogonal SOPs for dual-wavelength operation
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chirped FBG
CFBG
forms a standard linear laser cavity with PM-FBG
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optical coupler
50:50
extracts the laser output from the cavity
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optical spectrum analyzer
monitors the laser output
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