可调谐多波长自激布里渊掺铒光纤激光器

Tunable Self-Seeded Multiwavelength Brillouin Erbium-Doped Fiber Laser

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。

Two up-tapers are produced on a single mode fiber with the distance of 4.5 cm by the technology of fiber waist-enlarged fusion,so as to form a new single mode structure fiber with two spherical shapes based on MachZehnder interferometer（MZI）.A tunable self-seeded multiwavelength Brillouin erbium-doped fiber laser is designed based on MZI and put in the glycerol solution of different mass fractions.At the wavelength of 980 nm and the pumping power of 200 mW,the multiwavelength of the output laser is tuned from 1558.6 nm to 1562.8 nm,correspondingly to the changes of the effective refractive index of the optical fiber cladding,and the tunable range is about 4.2 nm.The six Brillouin laser wavelengths with the wavelength interval of 0.088 nm and the mean optical signal to noise ratio of more than 15 dB is obtained.The proposed laser has the advantages of simple structure,stable wavelength interval,and has great application prospect in dense wavelength division multiplexing and optical fiber sensing.