基于高精度微锥型长周期光纤光栅的宽带滤波器
Broadband Filter Based on High-Precision Microtapered Long-Period Fiber Gratings
查看参考文献22篇
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文摘
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提出基于双光束二氧化碳(CO_2)激光的加热方法,设计并搭建了微锥型结构的长周期光纤光栅制备系统。该系统通过精确控制CO_2激光功率、加热时间、光斑大小等实现均匀加热和光纤软化,通过高精度的步进电机控制光纤微型拉锥长度和拉锥比,以产生周期性的物理形变,制备出高精度(消光比>30 dB,插入损耗<1 dB)、光谱不退化的微锥型长周期光纤光栅(MT-LPFGs)。基于级联MT-LPFGs实现了宽带全光纤滤波器。实验结果表明,设计的双级联MT-LPFGs在30 dB消光比下实现了15 nm的宽带滤波,与单个光栅相比,其滤波带宽增加7.5倍;三级联MT-LPFGs在-25 dB带阻深度下能够实现25.2 nm的宽带滤波,该滤波带宽为单个光栅的12.6倍。最后,通过弯曲实验证明了级联光栅滤波器的弯曲容限为1.183 m-1。该滤波器具有精度高、制备简单、光谱不退化等优点,在宽带滤波方面有着重要应用。 |
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其他语种文摘
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A heating method based on double-beam carbon dioxide (CO_2) laser is proposed, and the fabrication system of a long-period fiber grating with a microtapered structure is designed and built. The system achieves uniform heating and fiber softening by accurately controlling the CO_2 laser power, heating time, and spot size. The microtapered long-period fiber gratings (MT-LPFGs) with high-precision (extinction ratio >30 dB and insertion loss <1 dB) and without spectral degradation are fabricated by controlling the micro taper length and tapering ratio via a high-precision stepping motor. Based on cascaded MT-LPFGs, a broadband all fiber filter is realized. Experimental results show that the designed dual cascaded MT-LPFGs can achieve 15 nm broadband filtering at the extinction ratio of 30 dB, and the filtering bandwidth is increased by 7.5 times compared with that of the single grating. The three cascaded MT-LDFGs can achieve 25.2 nm broadband filtering at -25 dB band stop depth, which is 12.6 times that of a single grating. Finally, the bending tolerance of the cascaded grating filter is proved to be 1.183 m-1 by the bending experiment. The filter has advantages of high precision, simple preparation, and no spectral degradation, so it has an important application in broadband filtering. |
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来源
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激光与光电子学进展
,2020,57(19):190605 【核心库】
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DOI
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10.3788/LOP57.190605
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关键词
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光纤光学
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长周期光纤光栅
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二氧化碳激光加热
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光纤微加工
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宽带滤波
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地址
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1.
西安邮电大学电子工程学院, 陕西, 西安, 710121
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陕西师范大学物理学与信息技术学院, 陕西, 西安, 710119
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中国科学技术大学信息科学技术学院, 安徽, 合肥, 230026
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中国科学院西安光学精密机械研究所, 瞬态光学与光子技术国家重点实验室, 陕西, 西安, 710119
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1006-4125 |
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学科
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电子技术、通信技术 |
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基金
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国家自然科学基金
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陕西省自然科学基金
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陕西省教育厅项目
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文献收藏号
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CSCD:6841688
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