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提出了一种基于重叠光栅(SIFG)和啁啾光栅(CFBG)的线形腔双波长光纤激光器。激光器采用反射率高于99%的SIFG和带反射率凹陷的CFBG作为波长选择器件,掺铒光纤(EDF)作为增益介质。基于增益均衡技术,激光器通过调节腔内起振双波长处增益与损耗相等抑制模式竞争,实现室温下双波长激射。实验结果表明,本文激光器能够同时输出稳定的1 556.852nm和1 557.680nm双波长激光,线宽小于0.1nm,输出激光的边模抑制比(SMSR)可达15dB,且波长及功率稳定性好;激光器耦合损耗小、结构简单和易于集成,可用于密集波分复用(DWDM)系统、光纤传感等领域。
A linear cavity dual-wavelength fiber laser based on overlapped grating (SIFG) and chirped grating (CFBG) is proposed. The laser uses SIFG with reflectivity above 99% and CFBG with reflectivity sunken as the wavelength-selective device with erbium-doped fiber (EDF) as the gain medium. Based on the gain equalization technique, the laser can achieve the dual-wavelength lasing at room temperature by adjusting the gain and loss equal suppression modes at the two wavelengths of the start-up cavity in the cavity. Experimental results show that the proposed laser can output stable 1 556.852 nm and 1 557.680 nm dual wavelength lasers with a linewidth of less than 0.1 nm and an output laser with a mode side suppression ratio (SMSR) of up to 15 dB with good wavelength and power stability. The laser coupling loss is small, the structure is simple and easy to integrate, can be used for dense wavelength division multiplexing (DWDM) systems, optical fiber sensing and other fields.