扭转螺旋型力学微弯长周期光纤光栅的光谱特性

发布时间：2018-01-17 18:23

本文关键词：扭转螺旋型力学微弯长周期光纤光栅的光谱特性　出处：《光学精密工程》2017年07期 　论文类型：期刊论文

【摘要】：利用两个交替放置的周期性V型刻槽板对均匀扭转后的普通单模光纤径向施力制作螺旋型力学微弯长周期光纤光栅(H-MLPFG)。通过实验研究了周期压力和扭转率对该光栅传输谱特性的影响,以及其偏振相关特性。结果表明,施加在光纤的径向压力可以改变H-MLPFG的耦合强度,但不影响其谐振波长变化,LP_(13)耦合模耦合强度在波长1 549.75nm处为30.1dB。当光纤扭转率由0增大到5.38rad/cm,LP_(11)、LP_(12)和LP_(13)模对应的扭转灵敏度分别为1.59、1.82和2.24nm/(rad·cm~(-1))。光纤扭转率为0.90rad/cm时,LP_(13)包层模具有最大偏振相关损耗,在波长1 550.45nm处偏振相关损耗约为6.86dB,对应的谐振波长分离值为1.4nm。该方法制作的LPFG模式耦合强度和谐振波长具有可调谐和可重构性的优点、且结构简单,在光纤通信和传感领域具有潜在的应用价值。
[Abstract]:Fabrication of helical micro-bending long-period fiber gratings by radial force of two alternately placed periodic V-shaped grooves on uniform torsional single mode fiber. The effects of periodic pressure and torsion rate on the transmission spectrum of the grating are investigated experimentally. The results show that the coupling strength of H-MLPFG can be changed by the radial pressure applied to the fiber, but the resonant wavelength of H-MLPFG can not be affected. The coupled-mode coupling strength is 30.1dB at the wavelength of 1 549.75 nm. When the fiber torsion ratio increases from 0 to 5.38 radr / cm ~ (-1), the coupling strength is 30. 1 dB 路cm ~ (-1) 路cm ~ (-1) 路cm ~ (-1) 路cm ~ (-1)). The torsional sensitivities of LPSC12) and LPS-13) modes are 1.59, respectively. When the fiber torsion ratio is 0.90 radr / cm), the maximum polarization dependent loss is found in the cladding molds. The polarization dependent loss at 1 550.45 nm is about 6.86 dB. The corresponding resonant wavelength separation value is 1.4 nm. The LPFG mode coupling strength and resonant wavelength are tunable and reconfigurable, and the structure is simple. It has potential application value in the field of optical fiber communication and sensing.
【作者单位】：重庆理工大学电气与电子工程学院;重庆理工大学现代光电检测技术与仪器重点重庆市实验室;
【基金】：国家自然科学基金资助项目(No.61505017) 重庆市教委科学技术研究项目(No.KJ1709192;KJ1709211) 重庆市科委前沿与应用基础研究计划一般项目(No.cstc2014jcyjA0081;cstc2015jcyjA40035) 中国博士后基金资助项目(No.2016M592649) 重庆理工大学青年科研项目星火支持计划(No.2015XH05)
【分类号】：TN253
【正文快照】： 2.重庆理工大学现代光电检测技术与仪器重点重庆市实验室,重庆400054)1引言长周期光纤光栅(Long Period FiberGrating,LPFG)是一种透射型光栅,其周期在100μm~1mm,光纤纤芯折射率的周期性微扰使纤芯传输的基模能量耦合到同向传输的不同阶次包层模中,从而在传输谱中对应的谐振

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