UV-Inscription, Polarization-Dependant Loss Characteristics and Applications of 45$^{\circ}$ Tilted Fiber Gratings
UV-Inscription, Polarization-Dependant Loss Characteristics and Applications of 45$^{\circ}$ Tilted Fiber Gratings
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DOI：
10.1109/jlt.2011.2163196
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发表时间：
2011-09
影响因子：
4.7
通讯作者：
Zhijun Yan;C. Mou;K. Zhou;Xianfeng Chen;Lin Zhang
中科院分区：
文献类型：
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作者：
Zhijun Yan;C. Mou;K. Zhou;Xianfeng Chen;Lin Zhang
我们对结构倾斜45°的紫外刻纹光纤光栅进行了理论和实验分析，并将此类器件实现为光纤内偏振器。对45°倾斜光纤光栅的偏振相关损耗和热响应特性进行了系统的研究。详细的理论模型揭示了光栅长度和PDL之间的线性关系，这已被实验结果所证明。首次研究了倾斜相位掩模的紫外光衍射特性，并设计了适合45° TFG制作的紫外光刻写系统。实验上，24 mm长的45° TFG UV写入标准通信单模光纤在1530 nm处表现出约25 dB PDL，PDL光谱带宽超过~ 300 nm。通过级联方法，44 mm长的光栅显示出高达40 dB的PDL，接近商业产品的高偏振消光比。此外，我们已经揭示了45° TFG的PDL具有低的热影响，这对于真实的应用器件是期望的。最后，我们实验演示了基于45°和81° TFG的全光纤扭转传感器系统。
We have UV-inscribed and theoretically and experimentally analyzed fiber gratings with the structure tilted at 45° and implemented this type of devices as an in-fiber polarizer. A systematic investigation has been carried out on the characterization of 45° tilted fiber gratings (45° TFGs) in terms of the polarization-dependant loss (PDL) and thermal response. The detailed theoretical modeling has revealed a linear correlation between the grating length and the PDL, which has been proved by the experimental results. For the first time, we have examined the UV beam diffraction from a tilted phase mask and designed the UV-inscription system to suit the 45° TFG fabrication. Experimentally, a 24 mm long 45° TFG UV-inscribed in standard telecom single-mode fiber exhibited around 25 dB PDL at 1530 nm and an over ~ 300 nm bandwidth of PDL spectrum. By the concatenation method, a 44 mm long grating showed a PDL as high as 40 dB that is close to the high polarization extinction ratio of commercial products. Moreover, we have revealed that the PDL of 45° TFGs has low thermal influence, which is desirable for real application devices. Finally, we experimentally demonstrated an all-fiber twist sensor system based on a 45° and an 81° TFG.