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提出并利用高频CO2激光脉冲在普通单模通信光纤上写出了包层旋转折变型长周期光纤光栅(R-LPFG).在分析R-LPFG波导结构和双折射特性的基础上,对光栅周期数和折变旋转度分别为50和7.2°/周期的R-LPFG进行了实验研究.结果表明,这种类型的光栅可极大地降低其谐振波长对横向负荷不同作用方向所表现出的方向相关性,并且其谐振峰幅度横向负荷灵敏度在任意方向下均高达0.37dB/(g.mm-1),是普通LPFG横向负荷灵敏度的9倍左右.利用R-LPFG的温度线性响应特性和独特的横向负荷特性,设计并实验研究了一种动态增益均衡器,用其平坦掺铒光纤放大器增益谱,在C波段32nm范围内,其平坦度小于±0.5dB,可满足实际环境对通信系统的平坦应用要求.
A new type of long-period fiber grating (R-LPFG) with cladding rotation is written and written on the common single-mode communication fiber by using high-frequency CO2 laser pulses.Based on the analysis of the structure and birefringence of the R-LPFG waveguide, The experimental results show that this type of grating can greatly reduce the influence of the resonant wavelength on the direction of transverse load acting in different directions And its resonant peak amplitude transverse load sensitivity is as high as 0.37dB / (g.mm-1) in any direction, which is about 9 times of the normal LPFG horizontal load sensitivity.Using the temperature linear response characteristic of R-LPFG and unique A dynamic gain equalizer is designed and experimentally studied. With its flat gain spectrum of erbium-doped fiber amplifier, its flatness is less than ± 0.5dB in the C band of 32nm, which can meet the requirements of practical environment Flat application requirements.