研究目的
To propose and demonstrate a switchable dual-wavelength erbium-doped fiber laser based on a phase-shifted fiber Bragg grating (PSFBG) combined with Mach-Zehnder interferometer (MZI) and Sagnac loop, achieving tunable wavelength spacing with high stability and fineness.
研究成果
The proposed switchable dual-wavelength erbium-doped fiber laser achieves fine wavelength spacing as small as 0.04 nm with high stability (SMSR > 40 dB). It has significant potential applications in DWDM systems and similar fields requiring high fineness filters.
研究不足
The PSFBG is uncoated, limiting the maximum strain applied and thus the tunability range. Ambient temperature affects the PSFBG, potentially causing wavelength drift and intensity variations.
1：Experimental Design and Method Selection:
The experiment utilizes a PSFBG combined with MZI and Sagnac loop to form a filter for achieving switchable dual-wavelength fiber laser. The adjustment of PC and tuning the delay are used to control wavelength and spacing.
2：Sample Selection and Data Sources:
The PSFBG is fabricated by hydrogen-loaded SMF through a 244 nm Argon laser exposing the uniform phase mask. The gain is provided by a 6-m-long EDF1, pumped by a laser diode (LD) with central wavelength of 976 nm.
3：List of Experimental Equipment and Materials:
Includes PSFBG, PC, EDF1, LD, WDM, couplers, translation stages, and OSA for monitoring.
4：Experimental Procedures and Operational Workflow:
The setup involves adjusting PC and applying strain to PSFBG to achieve tunable single- and dual-wavelength outputs, monitored by OSA.
5：Data Analysis Methods:
The output spectra are analyzed for wavelength spacing, SMSR, and stability over time.
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