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利用光纤扩径腰椎熔接技术,分别对长为4.5cm单模光纤的两端进行扩径,形成了球形-单模-球形结构的新型马赫-曾德尔干涉仪(MZI)。基于MZI构造了一种可调谐多波长自激布里渊掺铒光纤激光器。将其置于丙三醇溶液中,在波长为980nm、抽运功率为200mW的情况下,改变丙三醇质量分数会引起光纤包层外界环境的有效折射率的变化,从而导致干涉光谱的改变,实现在1558.6~1562.8nm范围内输出激光波长可调谐,其调谐范围为4.2nm,得到了波长间隔为0.088nm、平均光信噪比大于15dB的6个布里渊激光输出。该激光器结构简单、波长间隔稳定,在密集波分复用、光纤传感等领域的应用前景十分广阔。
The diameter of the single-mode optical fiber with a length of 4.5 cm was expanded by using the technique of expanded diameter lumbar splicing to form a new Mach-Zehnder interferometer (MZI) with spherical-single-mode-spherical structure. A tunable multi-wavelength self-excited Brillouin erbium-doped fiber laser based on MZI was constructed. When placed in a glycerol solution, changing the mass fraction of glycerol at a wavelength of 980 nm and a pumping power of 200 mW will cause changes in the effective refractive index of the optical fiber cladding outside environment, resulting in a change in the interference spectrum The tunable output laser wavelength is 1558.6 ~ 1562.8nm. The tunable range is 4.2nm. Six Brillouin laser outputs with the wavelength of 0.088nm and the average optical signal to noise ratio of more than 15dB are obtained. The laser has the advantages of simple structure, stable wavelength interval, and wide application prospect in the fields of dense wavelength division multiplexing and optical fiber sensing.