摘要
We report the observation of second order Bragg resonance(2 nd-OBG) produced by tilted fiber gratings(TFGs) fabricated using phase mask UV inscription.The theoretical analysis has revealed that the generation of high order Bragg resonance of gratings is induced by a square-shape refractive index profile,which is caused by over-saturated UV exposure.In the experiment,we have studied the TFGs with different tilt angles under over-saturated UV exposure,in which all gratings have showed the 2 nd-OBR,and the larger tilt angle of the grating has the stronger 2 nd-OBR.When the tilt angle of the grating is-45°,the Bragg resonance exhibits very strong polarization dependence,because the 2 nd-OBR wavelength is located within the polarizing bandwidth of 45° TFG.Finally,we have demonstrated an erbium-doped fiber laser with> 99.9% degree of polarization,and,by applying mechanical stretching on the grating,a wavelength tunable laser output has been achieved.The output laser shows ~0.2 dB amplitude variation within 1 h continuous monitoring of the laser.
作者
Qingguo Song
Bolin Ye
Xiangpeng Xiao
Chengjun Huang
Chengbo Mou
Zhijun Yan
Lin Zhang
宋青果;叶柏林;肖翔鹏;黄成俊;牟成博;闫志君;张琳(School of Optical and Electronic Information,NGIA,Huazhong University of Science and Technology,Wuhan 430074,China;Shenzhen Techwinsemi Optoelectronic Co.,Ltd.,Shenzhen 518000,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai Institute for Advanced Communication and Data Science,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai University,Shanghai 200444,China;Aston Institute of Photonic Technologies,Aston University,Birmingham B47ET,UK)
基金
supported in part by the National Natural Science Foundation of China (No. 62075071)
the National Science Fund for Excellent Young Scholars (No. 61922033)
the ‘111’ Project (No. D20031)
the Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone applied fundamental research project (No. HZQB-KCZYB-2020082)
