摘要
We propose and demonstrate the cascaded multi-wavelength mode-locked erbium-doped fiber laser(EDFL) based on ultralong-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 m W 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.
作者
郭波
郭心宇
唐李格
杨文蕾
尘秋美
任忠要
Bo Guo;Xinyu Guo;Lige Tang;Wenlei Yang;Qiumei Chen;Zhongyao Ren(Key Laboratory of In-fiber Integrated Optics,Ministry of Education,Harbin Engineering University,Harbin 150001,China)
基金
supported by the Natural Science Foundation of Heilongjiang Province (No.JJ2019LH1509)
National Natural Science Foundation of China (NSFC)(Nos.11704086 and61875043)
Fundamental Research Funds for the Central Universities (No.3072020CF2519)
111 Project of Harbin Engineering University (No.B13015)。