Lin Ja-Hon, Zhang Zhan-Yao, Li Zhen-Ying, Peng Peng-Chun, Song Yu-Feng, Zhang Han
Advanced nanophotonics technology laboratory, Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, P. R. China.
Nanophotonics. 2022 Oct 28;11(21):4831-4841. doi: 10.1515/nanoph-2022-0544. eCollection 2022 Dec.
With the insertion a segment of polarization-maintaining fiber (PMF) inside the cavity, abundant dynamics of group velocity locked vector solitons (GVLVSs) in Er-doped fiber laser have been investigated by using graphene oxide/polyvinyl alcohol (GO/PVA) film as a saturable absorber (SA). The generated Kelly sidebands in emission spectra reveal peak-valley or valley-peak alternation and slightly shift in two orthogonal components, which are the characteristics of GVLVSs. Through proper adjustment of polarization controllers (PCs) inside the EDFLs cavity, versatile vector soliton dynamics such as polarization locked GVLVSs (PL-GVLVSs), polarization rotation GVLVSs (PR-GVLVSs), dual wavelength GVLVSs, bound state GVLVSs, bunch GVLVSs and harmonic mode-locking GVLVSs (HML-GVLVSs) have been observed. The separation between two emission peaks from the dual wavelength GVLVSs was controlled by the Lyot filter and related to the insertion length of PMF inside the cavity. Unlike PL-GVLVSs, the period-doubling phenomenon has been found in two orthogonal components of the PR-GVLVSs. Besides, the bound state GVLVSs were generated showing strongly modulated interference fringes in emission spectrum. For the bunch and HML GVLVSs, the number of solitons inside the cavity increased with the pump power, and it showed the quintuple solitons and the 7th HML-GVLVSs at the highest pump power.
通过在腔内插入一段保偏光纤(PMF),利用氧化石墨烯/聚乙烯醇(GO/PVA)薄膜作为饱和吸收体(SA),研究了掺铒光纤激光器中群速度锁定矢量孤子(GVLVSs)的丰富动力学特性。发射光谱中产生的凯利边带在两个正交分量中呈现峰谷或谷峰交替以及轻微偏移,这是GVLVSs的特征。通过适当调整掺铒光纤激光器(EDFLs)腔内的偏振控制器(PCs),观察到了多种矢量孤子动力学现象,如偏振锁定GVLVSs(PL-GVLVSs)、偏振旋转GVLVSs(PR-GVLVSs)、双波长GVLVSs、束缚态GVLVSs、束状GVLVSs和谐波锁模GVLVSs(HML-GVLVSs)。双波长GVLVSs两个发射峰之间的间隔由利奥滤光器控制,并与腔内PMF的插入长度有关。与PL-GVLVSs不同,在PR-GVLVSs的两个正交分量中发现了倍周期现象。此外,产生的束缚态GVLVSs在发射光谱中显示出强烈调制的干涉条纹。对于束状和HML GVLVSs,腔内孤子的数量随泵浦功率增加,在最高泵浦功率下出现了五重孤子和第7阶HML-GVLVSs。