Bending-induced inter-core group delays in multicore fibers
Bending-induced inter-core group delays in multicore fibers
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DOI：
10.1364/oe.25.031863
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发表时间：
2017-12-11
期刊：
影响因子：
3.8
通讯作者：
Rigneault, Herve
中科院分区：
文献类型：
--
作者：
Tsvirkun, Viktor;Sivankutty, Siddharth;Rigneault, Herve
通过数值模拟和实验测量研究了光纤弯曲对超短脉冲在169芯多芯光纤中传输的影响。我们发现，一个L形的弯曲（其中只有一端的MCF是固定的）引起显着的变化，群延迟是一个函数的核心位置，但线性沿着弯曲轴的斜率成正比的弯曲角度。对于U形和S形弯曲（其中MCF的两端是固定的），诱导的折射率和群延迟变化远小于未弯曲的MCF的残余的、固有的芯间群延迟差。我们进一步表明，当用于点扫描无透镜内窥镜与超短脉冲激励，弯曲引起的群延迟的MCF降低点扩散函数由于时空耦合。我们的研究结果表明，弯曲引起的影响MCFs可以参数化只有两个参数：弯曲轴的角度和幅度的弯曲。这对于高达至少200度的弯曲幅度仍然有效。(C)根据OSA开放获取出版协议的条款，2017年美国光学学会
We examine the impact of fiber bends on ultrashort pulse propagation in a 169-core multicore fiber (MCF) by numerical simulations and experimental measurements. We show that an L-shaped bend (where only one end of the MCF is fixed) induces significant changes in group delays that are a function of core position but linear along the bending axis with a slope directly proportional to the bending angle. For U-and S-shaped bends (where both ends of the MCF are fixed) the induced refractive index and group delay changes are much smaller than the residual, intrinsic inter-core group delay differences of the unbent MCF. We further show that when used for point-scanning lensless endoscopy with ultrashort pulse excitation, bend-induced group delays in the MCF degrade the point-spread function due to spatiotemporal coupling. Our results show that bend-induced effects in MCFs can be parametrized with only two parameters: the angle of the bend axis and the amplitude of the bend. This remains valid for bend amplitudes up to at least 200 degrees. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement