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Design of large-mode-area single-mode optical fiber with lowing bending loss for Raman distributed temperature sensor

机译:降低弯曲损耗的拉曼分布温度传感器大模面积单模光纤的设计

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摘要

Numerical investigation on the design of a large-mode-area (LMA) single-mode photonic crystal fiber (PCF) as the sensing fiber for Raman distributed temperature sensor (DTS) is presented. The PCF can enable single-mode operation and have an extremely LMA exceeding 288 μm~2 when kept straight and over 284 μm~2 with a lower bending loss of 0.25 dB/m when bent over a 5 cm radius at a wavelength of 1550 nm. We outline the principles of our fiber design and explore the unique properties of the fiber for Raman DTS. Calculation results show that the Raman DTS system, which used the proposed PCF as the sensing fiber, can improve SNR about 3.4 times by increasing the input power compared with the Raman DTS system with a conventional single-mode fiber, because of the improved LMA, single-mode operation and good bending characteristics of the PCF.
机译:提出了一种设计为大面积区域(LMA)单模光子晶体光纤(PCF)作为拉曼分布式温度传感器(DTS)的传感光纤的数值研究。 PCF可以实现单模操作,并且在保持直线状态时具有超过288μm〜2的极高LMA,在超过284μm〜2时具有超过0.25μm〜2的低LMA,在半径为1550 nm的5 cm半径上弯曲时的弯曲损耗较低,为0.25 dB / m 。我们概述了光纤设计的原理,并探讨了拉曼DTS光纤的独特性能。计算结果表明,与改进的单模光纤的拉曼DTS系统相比,采用拟议的PCF作为传感光纤的拉曼DTS系统与传统的单模光纤的拉曼DTS系统相比,通过增加输入功率可以将SNR提高约3.4倍。单模操作和PCF的良好弯曲特性。

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