Ultra-long-period grating-based multi-wavelength ultrafast fiber laser [Invited]

• 作者: Bo Guo Xinyu Guo Lige Tang Wenlei Yang Qiumei Chen Zhongyao Ren
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: Lasers, Optical Amplifiers, and Laser Optics
• 页码范围: 48-55
• 页数: 8页
• 语种: 英文
• DOI: 10.3788/COL202119.071405

摘要

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 con-ventional 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.