摘要
Acousto-optic interaction can be used for ultrafast optical field control in passively mode-locked fiber lasers.Here,we propose the use of an intracavity acousto-optic mode converter (AOMC) with combination of a few-mode fiber Bragg gratings (FM-FBG) to achieve narrow linewidth mode-locked pulse output with switchable transverse mode and wavelength in a ring fiber laser.Due to the selectivity of the FM-FBG to the input mode,the output mode and wavelength can be adjusted in the mode-locked fiber laser based on a semiconductor saturable absorption mirror.In experiments,by adjusting the acoustic frequency imposed in the AOMC,the wavelength of mode-locked pulses was switched from 1551.52 nm to 1550.21 nm,retaining the repetition rate of 12.68 MHz.At the same time,the mode conversion from the LP;to the LP;mode in the FM-FBG transmission port was achieved.This laser may find application in mode-division multiplexing systems.
作者
Shaokang Bai
Yaqiong Lu
Zuxing Zhang
白少康;陆亚琼;张祖兴(Advanced Photonic Technology Laboratory,College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)
基金
This work was partially supported by the National Natural Science Foundation of China(Nos.91950105 and 62175116)
the 1311 Talent Plan of Nanjing University of Posts and Telecommunications。
