共查询到16条相似文献,搜索用时 78 毫秒
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基于扭曲长周期光纤光栅的高灵敏度压力传感器 总被引:2,自引:4,他引:2
研究了高频CO2激光脉冲写入的长周期光纤光栅在扭曲状态下的横向负载特性.发现扭曲降低了光纤光栅谐振波长横向负载灵敏度的方向相关性,使得这种光栅在各圆周方向上谐振波长对横向负载都不敏感,而谐振峰幅度随横向负载的增加线性减小,且谐振峰幅度的负载灵敏度随扭曲率的增加而提高.在扭曲率为1.8°mm-1时负载灵敏度可达0.47 dB/(g·mm-1),是自由状态长周期光纤光栅横向负载灵敏度的7倍,最后给出了利用这种扭曲长周期光纤光栅通过强度解调实现压力传感的实验研究结果. 相似文献
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新型长周期光纤光栅的横向负载特性及其偏振相关性研究 总被引:3,自引:2,他引:1
发现高频CO2激光脉冲写入的长周期光纤光栅谐振波长的横向负载特性具有较强的负载方向相关性,而损耗峰幅值的横向负载特性的方向相关性较弱.不同圆周方向的横向负载对谐振波长偏振相关性的影响差异较大,但对损耗峰幅值偏振相关性的影响差异较小.利用横向负载引起双折射进而导致光栅的光学主轴旋转的相关理论,合理解释了该长周期光纤光栅独特的横向负载特性及其偏振相关性. 相似文献
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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.
关键词:
光纤通信技术
长周期光纤光栅
动态增益均衡
旋转折变 相似文献
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本文提出了一种基于光纤叠栅的全光纤声光可调谐滤波器, 与普通光纤布拉格光栅型全光纤声光可调谐滤波器相比, 该滤波器能够对光纤叠栅的两个中心波长进行同步调制. 理论分析了声波频率和声致应变幅度对基于光纤叠栅的全光纤声光可调谐滤波器的传输光谱的影响, 结果表明, 各阶次反射峰分别以两个主反射峰为中心呈对称关系, 且主反射峰与其所调制出的次反射峰之间的波长间隔与声波频率成正比, 而两个主反射峰所调制出的同阶次反射峰之间的波长间隔与声波频率无关; 声致应变幅度主要影响主反射峰及次反射峰的反射率的变化. 实验中, 分别测试声波频率为390 kHz和710 kHz的基于光纤叠栅的全光纤声光可调谐滤波器的传输光谱, 实验结果的变化趋势与仿真分析结果相一致. 相似文献
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Xinhuan Feng Lei Sun Yange Liu Lingyun Xiong Shuzhong Yuan Guiyun Kai Xiaoyi Dong 《Optical and Quantum Electronics》2004,36(10):919-926
A simple actively mode-locked fiber ring laser is proposed and successfully demonstrated to generate dual-wavelength picosecond pulses with close wavelength spacing using one Bragg grating in standard single-mode fiber. The proposed laser can be made to operate in stable dual-wavelength at room temperature, due to the birefringence characteristic of the FBG induced by transverse strain. Transverse strain loading on the FBG allows the wavelength spacing to be controlled. Generation of stable dual-wavelength pulses with a pulsewidth of 212–234 ps and a tunable wavelength separation from 0.2 to 0.44 nm at a pulse rate of 1.05 GHz was demonstrated. 相似文献
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Tunable fiber gratings fabricated in photonic crystal fiber by use of mechanical pressure 总被引:1,自引:0,他引:1
The mode-coupling properties of tunable long-period fiber gratings (LPGs) formed in photonic crystal fibers (PCFs) are presented. The mode coupling from the fundamental core mode to a cladding mode of a PCF is obtained by use of periodic mechanical pressure. The strength and the wavelength of the resonant peak are tuned by adjusting the grating period and the pressure applied on the PCF. Contrary to the conventional fiber case, the resonant wavelength of the PCF LPG is decreased by increasing the periodicity. 相似文献
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A full experimental characterization of mechanically induced long-period fiber gratings (MLPFGs) fabricated by pressing a plate with periodic grooves against a short length of fiber is presented. This technique enables a good control over the gratings' isolation loss peaks and has high repeatability. The spectra characteristics of MLPFGs are studied with the change of the parameters including pressure, period, and temperature. The produced MLPFGs have low insertion loss (〈 0.2 dB) and the loss peaks can be higher than 20 dB. A large tunability of the resonant wavelength (〉 14 nm) is achieved through adjusting pres- sure grooves' period. The center wavelength temperature sensitivities of 0.057, 0.086 nm/℃, and resonant peak temperature sensitivities of 0.230, 0.312 dB/℃, are achieved for jacketed and unjacketed fibers, respectively. These MLPFGs, which are simple and inexpensive, also offer the unique advantages of being tunable, erasable, and reconfigurable. 相似文献