Silt-Beam Shaping Method for Femtosecond Laser Point-by-Point Inscription of Highly Localized Fiber Bragg Gratings with Enhanced Cladding Modes

2021 19th International Conference on Optical Communications and Networks (ICOCN) Pub Date : 2021-08-23 DOI:10.1109/ICOCN53177.2021.9563858

Runxiao Chen, Jun He, Xizhen Xu, C. Liao, Yiping Wang

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Abstract

We propose and experimentally demonstrate a slit beam shaping method for fabricating Point-by-Point (PbP) highly localized fiber Bragg gratings (FBGs). The influences of the pulse energy and the slit width were studied, and after optimizing these parameters, the enlarged refractive index modulation (RIM) was produced. These RIMs were precisely assembled in a fiber core, generating highly localized FBGs with a comb of enhanced cladding mode resonances (30 dB) and a low insertion loss (0.3 dB). Note that the cladding mode resonance has a wide span of 240 nm in transmission spectrum. Furthermore, highly localized tilted fiber Bragg gratings (TFBGs) with various tilted angle can be fabricated to obtain a comb of selective enhanced cladding modes, via adjusting the tilted angle of the slit. Moreover, we investigated the thermal characteristics of the highly localized FBGs. The results show that such a device can withstand a temperature of 1000 °C.

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高局域光纤Bragg光栅的飞秒激光逐点刻蚀粉砂光束整形方法

我们提出并实验证明了一种缝束整形方法用于制造点对点(PbP)高局域光纤布拉格光栅(fbg)。研究了脉冲能量和狭缝宽度的影响，优化后得到了放大折射率调制(RIM)。这些环精确地组装在光纤芯中，产生高度局域化的fbg，具有增强包层模式共振的梳状结构(30 dB)和低插入损耗(0.3 dB)。包层模式共振在透射谱上有240nm的宽跨度。此外，通过调整狭缝的倾斜角度，可以制作出具有不同倾斜角度的高度局域化倾斜光纤布拉格光栅(tfbg)，从而获得选择性增强包层模式的梳状结构。此外，我们还研究了高度局域化fbg的热特性。结果表明，该器件可承受1000℃的高温。

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2021 19th International Conference on Optical Communications and Networks (ICOCN)

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