Author Affiliations
Abstract
Key Laboratory of In-fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
We propose and demonstrate the cascaded multi-wavelength mode-locked erbium-doped fiber laser (EDFL) based on ultra-long-period gratings (ULPGs) for the first time, to the best of our knowledge. Study found that the ULPG can be used as both a mode-locker for pulse shaping and a comb filter for multi-wavelength generation simultaneously. Using the dual-function of ULPG, three-, four-, five-, six-, and seven-wavelength mode-locked pulses are obtained in EDFL, seven of which are the largest number of wavelengths up to now. For the four-wavelength soliton pulses, their pulse width is about 7.8 ps. The maximum average output power and slope efficiency of these pulses are 8.4 mW and 2.03%, respectively. Besides the conventional pulses, hybrid soliton pulses composed of a four-wavelength pulse and single soliton are also observed. Finally, the effect of cavity dispersion on the multi-wavelength mode-locked pulses is also discussed. Our findings indicate that apart from common sensing and filtering, the ULPG may also possess attractive nonlinear pulse-shaping property for ultrafast photonics application.
ultra-long-period grating fiber laser ultrafast laser multi-wavelength Chinese Optics Letters
2021, 19(7): 071405
西南交通大学 信息科学与技术学院 信息光子与通信研究中心，四川 成都 610031
文章分析了一种利用外差检测所得微波信号的电场振幅和频率来计算后向布里渊散射光功率及频移的方法。该方法通过对功率较强的微波信号进行数值拟合，利用得到的直流分量和交流分量计算出后向散射光功率、频移及其随温度、应变变化的系数矩阵。数值结果表明，温度、应变的解调精度分别为1℃、100 με，但也受到一定采样频率的限制。
光纤传感器 布里渊散射 外差检测 温度与应变 微波电光调制 optical fiber sensor Brillouin scattering heterodyne detection temperature and strain microwave electro-optic modulation
