19芯碲酸盐玻璃放大光纤的低串扰结构设计及性能仿真 增强出版

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王训四(1979-),男，湖南邵阳人，博士，研究员，博士生导师，2007年于中科院上海光学精密机械研究所获得博士学位，主要从事红外光学玻璃、红外光纤器件应用基础研究和关键技术研究。E-mial：wangxunsi@nbu.edu.cn" ], "graphic": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153759&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153761&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153760&type=", "width": "22.61407471", "height": "28.94863892", "fontsize": "" } ], "data": [ [ { "name": "text", "data": " " }, { "name": "text", "data": "王训四" }, { "name": "text", "data": "(1979-),男，湖南邵阳人，博士，研究员，博士生导师，2007年于中科院上海光学精密机械研究所获得博士学位，主要从事红外光学玻璃、红外光纤器件应用基础研究和关键技术研究。E-mial：" }, { "name": "text", "data": "wangxunsi@nbu.edu.cn" } ] ] } ], "email": "wangxunsi@nbu.edu.cn", "deceased": false } ], "aff": [ { "id": "aff1", "intro": [ { "lang": "zh", "label": "1", "text": "宁波大学高等技术研究院 红外材料与器件实验室，浙江 宁波　315211", "data": [ { "name": "text", "data": "宁波大学高等技术研究院 红外材料与器件实验室，浙江 宁波　315211" } ] }, { "lang": "en", "label": "1", "text": "Laboratory of Infrared Materials and Devices， Research Institute of Advanced Technology， College of Information， Ningbo University， Ningbo 315211， China", "data": [ { "name": "text", "data": "Laboratory of Infrared Materials and Devices， Research Institute of Advanced Technology， College of Information， Ningbo University， Ningbo 315211， China" } ] } ] }, { "id": "aff2", "intro": [ { "lang": "zh", "label": "2", "text": "吉林大学集成光电子学国家重点实验室，吉林 长春　130022", "data": [ { "name": "text", "data": "吉林大学集成光电子学国家重点实验室，吉林 长春　130022" } ] }, { "lang": "en", "label": "2", "text": "State Key Laboratory on Integrated Optoelectronics， Jilin University， Changchun 130012， China", "data": [ { "name": "text", "data": "State Key Laboratory on Integrated Optoelectronics， Jilin University， Changchun 130012， China" } ] } ] }, { "id": "aff3", "intro": [ { "lang": "zh", "label": "3", "text": "浙江省光电探测材料及器件重点实验室，浙江 宁波　315211", "data": [ { "name": "text", "data": "浙江省光电探测材料及器件重点实验室，浙江 宁波　315211" } ] }, { "lang": "en", "label": "3", "text": "Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province， Ningbo 315211， China", "data": [ { "name": "text", "data": "Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province， Ningbo 315211， China" } ] } ] }, { "id": "aff4", "intro": [ { "lang": "zh", "label": "4", "text": "浙江省海洋研究院，浙江 宁波　315211", "data": [ { "name": "text", "data": "浙江省海洋研究院，浙江 宁波　315211" } ] }, { "lang": "en", "label": "4", "text": "Zhejiang Institute of Oceanography， Ningbo 315832， China", "data": [ { "name": "text", "data": "Zhejiang Institute of Oceanography， Ningbo 315832， China" } ] } ] } ] }, "abstracts": [ { "lang": "zh", "data": [ { "name": "p", "data": [ { "name": "text", "data": "基于空分复用技术的多芯光纤通信核心指标之一是信道串扰，该问题的存在极大地影响着传输距离及信号质量，尤其是在宽带光纤放大系统中。本文重点讨论了弱耦合19芯光纤的串扰问题，同时提出了一种利于多组分碲酸盐玻璃挤压制备的沟槽辅助型19芯光纤，并采用耦合功率理论和有限元法对模型进行了相关性能的数值仿真，系统研究了沟槽尺寸、折射率分布及相关光纤参数对芯间串扰的影响。仿真结果表明优化设计后的光纤在1550nm处拥有-156dB/100m的低串扰值，可以满足大容量光纤通信用宽带光放大器的应用需求。" } ] } ] }, { "lang": "en", "data": [ { "name": "p", "data": [ { "name": "text", "data": "Channel crosstalk is one important feature of multi-core fiber communication based on space division multiplexing technology， which could affect the signal quality and transmission distance of the broadband fiber amplification system. This paper is focused on the crosstalk problems of a 19-core weak coupling optical fiber， as that can benefit much to develop high-volume communicating fiber based on fiber extrusion technology； Then， the optical coupling theory and finite element method are adopted to complete the numerical simulation of fiber performance， here， key parameters of groove size， core refractive index distribution and their influence on the crosstalk of the fiber are optimized wholly. The simulation results show that the optimized fiber has a low crosstalk of -156dB/100m at 1550nm， which could meet the requirements of future long-distance high-capacity optical fiber communication." } ] } ] } ], "keyword": [ { "lang": "zh", "data": [ [ { "name": "text", "data": "低串扰" } ], [ { "name": "text", "data": "19芯光纤" } ], [ { "name": "text", "data": "沟槽辅助型" } ], [ { "name": "text", "data": "多组分碲酸盐玻璃" } ] ] }, { "lang": "en", "data": [ [ { "name": "text", "data": "low crosstalk" } ], [ { "name": "text", "data": "19-core fiber" } ], [ { "name": "text", "data": "trench assisted" } ], [ { "name": "text", "data": "multicomponent tellurite glass" } ] ] } ], "highlights": [], "body": [ { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "1　引　　言" } ], "level": "1", "id": "s1" } }, { "name": "p", "data": [ { "name": "text", "data": "在带宽需求量迅速增长的通信网络背景下，波分复用与调制技术的结合使得光纤通信容量不断扩大，传统单模单芯光纤（SM-SCF）的容量已接近100Tb/s的香农传输极限，因此为了克服当前光纤通信系统面临的容量紧张的问题，空分复用逐渐成为焦点。空分复用技术（SDM）利用空间维度上的信道数量增加来提高单根光纤的传输容量" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "1", "type": "bibr", "rid": "R1", "data": [ { "name": "text", "data": "1" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "，可以分为少模光纤（FMF）和多芯光纤（MCF）。FMF支持多个模式的同步传输且易于制造，但是存在模间串扰" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "2", "type": "bibr", "rid": "R2", "data": [ { "name": "text", "data": "2" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "和MIMO（Multiple-Input-Multiple-Output，多输入多输出）复杂度高等问题；MCF则是通过在固定的包层区域内增加纤芯数量来提高信道数量，具有结构紧凑效率高等优势，然而由于在同一包层区域中包含多个纤芯，纤芯间距变窄则会增大芯间串扰（XT）。XT的存在会导致信号失真，从而大大缩短信号传输距离，所以MCF高容量传输的主要问题是——如何在增加纤芯数量的同时保持低的XT，以支持更多信道和更长传输距离" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "3", "type": "bibr", "rid": "R3", "data": [ { "name": "text", "data": "3" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。为了进一步提高SDM容量，已经提出了通过异质纤芯结构" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "4", "type": "bibr", "rid": "R4", "data": [ { "name": "text", "data": "4" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "、气孔辅助型结构" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "5", "type": "bibr", "rid": "R5", "data": [ { "name": "text", "data": "5" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "和沟槽辅助型结构的MCF来抑制XT" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "6", "type": "bibr", "rid": "R6", "data": [ { "name": "text", "data": "6" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。这些结构的存在可以减少相邻纤芯模式的电场重叠，增大光场束缚能力" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "7", "type": "bibr", "rid": "R7", "data": [ { "name": "text", "data": "7" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。异质多芯光纤由于纤芯材质差异大，导致光纤制备难度急剧增加；气孔辅助型多芯光纤存在空气孔易塌陷，引发光纤不易熔接等问题；沟槽辅助型结构的MCF相对来说制备工艺简单，在抑制XT方面也有极大优势。2013年，Sakaguchi等提出了传统的19芯同质纤芯结构的单模光纤，其传输容量达到了305Tb/s，但在有沟槽辅助的情况下串扰值仅降低到了-42dB/km" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "8", "type": "bibr", "rid": "R8", "data": [ { "name": "text", "data": "8" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。2017年，印度NIT利用沟槽辅助型9芯光纤探究了光纤各个结构参数对XT影响，数值模拟出-50dB/100km的低串扰值" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "9", "type": "bibr", "rid": "R9", "data": [ { "name": "text", "data": "9" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。2018年又提出了四种不同晶格结构的12芯5-LP模的MCF，仿真结果表明沟槽辅助型光纤通过改变纤芯排列方式后XT能降低至-138dB/100km" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "10", "type": "bibr", "rid": "R10", "data": [ { "name": "text", "data": "10" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "，但其中的少模传输会存在模间串扰问题。" } ] }, { "name": "p", "data": [ { "name": "text", "data": "在光纤基质的选择方面，目前多芯光纤的研究均基于石英光纤" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "11", "type": "bibr", "rid": "R11", "data": [ { "name": "text", "data": "11" } ] } }, { "name": "text", "data": ", " }, { "name": "xref", "data": { "text": "12", "type": "bibr", "rid": "R12", "data": [ { "name": "text", "data": "12" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。虽然石英基质MC-EDFA可以借助芯数优势提升信息放大容量，但其放大带宽仍局限在单波段" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "13", "type": "bibr", "rid": "R13", "data": [ { "name": "text", "data": "13" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "，无法彻底发挥C+L双波段超宽带超大容量通信的优势。与石英光纤相比，多组分玻璃光纤具有玻璃组分可调、稀土掺杂浓度高、增益带宽宽、单位长度增益高等诸多优点" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "blockXref", "data": { "data": [ { "name": "xref", "data": { "text": "14", "type": "bibr", "rid": "R14", "data": [ { "name": "text", "data": "14" } ] } }, { "name": "text", "data": "-" }, { "name": "xref", "data": { "text": "16", "type": "bibr", "rid": "R16", "data": [ { "name": "text", "data": "16" } ] } } ], "rid": [ "R14", "R15", "R16" ], "text": "14-16", "type": "bibr" } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。但是，与传统石英光纤成熟的气相沉积制备技术相比，多组分玻璃由于组分复杂、稳定性差等原因无法发展出成熟的光纤制备技术" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "17", "type": "bibr", "rid": "R17", "data": [ { "name": "text", "data": "17" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。因此，尚未有以碲酸盐为代表的多组分玻璃MCF制备及放大特性方面的报道。但是近年来，碲酸盐单模光纤的损耗研究已经降低至1dB/m以下" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "18", "type": "bibr", "rid": "R18", "data": [ { "name": "text", "data": "18" } ] } }, { "name": "text", "data": ", " }, { "name": "xref", "data": { "text": "19", "type": "bibr", "rid": "R19", "data": [ { "name": "text", "data": "19" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。此外，虽然本团队实验室开发了损耗低于0.38dB/m的7芯" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "20", "type": "bibr", "rid": "R20", "data": [ { "name": "text", "data": "20" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "和13芯" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "21", "type": "bibr", "rid": "R21", "data": [ { "name": "text", "data": "21" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "的硫系玻璃光纤，但是尚未开发出更多纤芯的宽带多组分玻璃光纤。" } ] }, { "name": "p", "data": [ { "name": "text", "data": "针对以上问题，本文利用耦合功率理论和有限元方法仿真了碲酸盐玻璃19芯光纤的串扰特性，并采用在抑制串扰方面具有一定优势且易于制备的沟槽辅助型结构进行研究。为了在增加纤芯数量的同时减小相邻纤芯的XT，对光纤结构进行了设计优化，并先后分析了沟槽的存在及各个参数的变化对XT的影响。数值仿真表明，该沟槽辅助型19芯光纤的XT在1550nm处达到了-156dB/100m的低串扰值。" } ] } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2　多芯光纤结构设计" } ], "level": "1", "id": "s2" } }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2.1　分析方法" } ], "level": "2", "id": "s2a" } }, { "name": "p", "data": [ { "name": "text", "data": "基于耦合模理论和耦合功率理论进行MCF弱耦合数值仿真是当前被广泛采用的方法。对于相同纤芯材质的MCF，当弯曲半径小于10m时，平均芯间串扰几乎是随着" }, { "name": "italic", "data": [ { "name": "text", "data": "R" }, { "name": "sub", "data": [ { "name": "text", "data": "b" } ] } ] }, { "name": "text", "data": "的增加而线性增加，因此平均功率耦合系数" }, { "name": "inlineformula", "data": [ { "name": "math", "data": { "math": "", "graphicsData": { "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153763&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153762&type=", "width": "3.80999994", "height": "4.23333359", "fontsize": "" } } } ] }, { "name": "text", "data": "可以简化为" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "22", "type": "bibr", "rid": "R22", "data": [ { "name": "text", "data": "22" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "：" } ] }, { "name": "dispformula", "data": { "label": [ { "name": "text", "data": "（1）" } ], "data": [ { "name": "math", "data": { "math": "", "graphicsData": { "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153765&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153764&type=", "width": "22.69066620", "height": "9.05933285", "fontsize": "" } } }, { "name": "text", "data": " " } ], "id": "DF1" } }, { "name": "p", "data": [ { "name": "text", "data": "其中，" }, { "name": "italic", "data": [ { "name": "text", "data": "k" }, { "name": "sub", "data": [ { "name": "text", "data": "pq" } ] } ] }, { "name": "text", "data": "是纤芯" }, { "name": "italic", "data": [ { "name": "text", "data": "p" } ] }, { "name": "text", "data": "与纤芯" }, { "name": "italic", "data": [ { "name": "text", "data": "q" } ] }, { "name": "text", "data": "之间的模式耦合系数，沟槽辅助型MCF的" }, { "name": "italic", "data": [ { "name": "text", "data": "k" }, { "name": "sub", "data": [ { "name": "text", "data": "pq" } ] } ] }, { "name": "text", "data": "推导表达式见文献" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "23", "type": "bibr", "rid": "R23", "data": [ { "name": "text", "data": "23" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。" }, { "name": "italic", "data": [ { "name": "text", "data": "β" }, { "name": "sub", "data": [ { "name": "text", "data": "p" } ] } ] }, { "name": "text", "data": "是纤芯" }, { "name": "italic", "data": [ { "name": "text", "data": "p" } ] }, { "name": "text", "data": "的传播常数，Λ为相邻纤芯之间的距离，" }, { "name": "italic", "data": [ { "name": "text", "data": "R" }, { "name": "sub", "data": [ { "name": "text", "data": "b" } ] } ] }, { "name": "text", "data": "是弯曲半径，一般依据光纤绕线盘的半径设置为14cm。此时光纤长度为" }, { "name": "italic", "data": [ { "name": "text", "data": "L" } ] }, { "name": "text", "data": "的两个相邻纤芯之间的XT可以表示为" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "24", "type": "bibr", "rid": "R24", "data": [ { "name": "text", "data": "24" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "：" } ] }, { "name": "dispformula", "data": { "label": [ { "name": "text", "data": "（2）" } ], "data": [ { "name": "math", "data": { "math": "", "graphicsData": { "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153767&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153766&type=", "width": "35.47533035", "height": "4.99533367", "fontsize": "" } } }, { "name": "text", "data": " " } ], "id": "DF2" } } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2.2　光纤结构设计" } ], "level": "2", "id": "s2b" } }, { "name": "p", "data": [ { "name": "text", "data": "从" }, { "name": "xref", "data": { "text": "式（2）", "type": "disp-formula", "rid": "DF2", "data": [ { "name": "text", "data": "式（2）" } ] } }, { "name": "text", "data": "可以看出XT随光纤传输长度的变化而增大。因此若要实现信号的长距离传输，必须严格控制XT。通常，弱耦合多芯光纤的长距离传输以XT低于-30dB/100km为设计标准" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "3", "type": "bibr", "rid": "R3", "data": [ { "name": "text", "data": "3" } ] } }, { "name": "text", "data": ", " }, { "name": "xref", "data": { "text": "10", "type": "bibr", "rid": "R10", "data": [ { "name": "text", "data": "10" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。本研究中的模型选择常用的规则六边形的纤芯排列，这是因为它在制造过程中更容易保证光纤结构的稳定性。下面以" }, { "name": "xref", "data": { "text": "图1", "type": "fig", "rid": "F1", "data": [ { "name": "text", "data": "图1" } ] } }, { "name": "text", "data": "（a）、（b）所示的两种19芯光纤的模型为基础，分别探究光纤有无沟槽的XT对比以及在1550nm处各个光纤参数（纤芯间距、内包层厚度、沟槽宽度、芯包折射率差、沟槽深度、纤芯半径等）对XT的影响，从而选择优化后的结构参数，以达到低串扰长距离传输的水平。本文仿真工作的目的是实现单模MCF相邻纤芯的串扰值远低于-60dB/100m。" }, { "name": "xref", "data": { "text": "图1", "type": "fig", "rid": "F1", "data": [ { "name": "text", "data": "图1" } ] } }, { "name": "text", "data": "（b）为沟槽辅助型19芯的剖面图，其中红色部分为掺铒纤芯，白色部分为低折射率环，二者中间部分（内包层）与包层材料相同，均为70TeO" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "-15ZnO-5La" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "O" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "-10WO" }, { "name": "sub", "data": [ { "name": "text", "data": "3" } ] }, { "name": "text", "data": "。" }, { "name": "xref", "data": { "text": "图1", "type": "fig", "rid": "F1", "data": [ { "name": "text", "data": "图1" } ] } }, { "name": "text", "data": "（c）给出了无沟槽和有沟槽两种同质光纤的折射率剖面图。∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "分别为芯包折射率差和沟槽深度，" }, { "name": "italic", "data": [ { "name": "text", "data": "n" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "、" }, { "name": "italic", "data": [ { "name": "text", "data": "n" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "0" } ] }, { "name": "text", "data": "、" }, { "name": "italic", "data": [ { "name": "text", "data": "n" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "分别为纤芯、包层和沟槽的折射率，" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "为纤芯半径、" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "为沟槽宽度、" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "-" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "为内包层厚度，" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "为相邻纤芯之间的距离。光纤初始参数设置为：∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=0.35%，∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=-0.35%，" }, { "name": "italic", "data": [ { "name": "text", "data": "n" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "0" } ] }, { "name": "text", "data": "=2.0337，" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=4.5μm，" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "=4.5μm，" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "-" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=4.5μm，" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=40μm。" } ] }, { "name": "figgroup", "data": { "id": "F1", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图1" } ], "title": [ { "name": "text", "data": "19芯光纤剖面图，（a）阶跃型；（b）沟槽辅助型；（c）折射率分布。" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.1" } ], "title": [ { "name": "text", "data": "Profile and refractive index distribution of 19-core fiber，（a） Step type； （b） Trench-assisted type； （c） Refractive index distribution" } ] } ], "note": [], "layout": "1;2;", "grid": [ [ { "name": "fig", "data": { "id": "F1a1", "caption": [ { "lang": "zh", "title": [] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153768&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153770&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153769&type=", "width": "65.29900360", "height": "25.27700043", "fontsize": "" } ] } }, { "name": 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"text", "data": "2.3.1　沟槽的存在及纤芯间距对XT的影响" } ], "level": "3", "id": "s2c1" } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "图2", "type": "fig", "rid": "F2", "data": [ { "name": "text", "data": "图2" } ] } }, { "name": "text", "data": "给出了" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=4.5、" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "=4.5、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=0.35%、" }, { "name": "italic", "data": [ { "name": "text", "data": "n" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=2.0337、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=-0.35%条件下，有沟槽和无沟槽光纤的XT随着纤芯间距的变化。可以看出随着纤芯间距的增大，XT呈现线性下降的趋势，并且沟槽辅助结构光纤的XT明显比无沟槽光纤低25dB左右。因此在220μm的有限包层区域内，在保证外层纤芯到包层边缘的距离≥30μm的标准" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "23", "type": "bibr", "rid": "R23", "data": [ { "name": "text", "data": "23" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "下可以获得最佳的纤芯间距，即" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=40μm。" } ] }, { "name": "fig", "data": { "id": "F2", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图2" } ], "title": [ { "name": "text", "data": "有无沟槽光纤的XT随纤芯间距的变化" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.2" } ], "title": [ { "name": "text", "data": "XT as a function of fiber core pitch with and without trench" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153776&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153778&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153777&type=", "width": "77.69583130", "height": "63.18884277", "fontsize": "" } ] } }, { "name": "p", "data": [ { "name": "text", "data": "通过COMSOL仿真软件分析了" }, { "name": "xref", "data": { "text": "图2", "type": "fig", "rid": "F2", "data": [ { "name": "text", "data": "图2" } ] } }, { "name": "text", "data": "中" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=30μm时带有完美匹配层的两种MCF纤芯中的能量分布，对比结果如" }, { "name": "xref", "data": { "text": "图3", "type": "fig", "rid": "F3", "data": [ { "name": "text", "data": "图3" } ] } }, { "name": "text", "data": "所示。" }, { "name": "xref", "data": { "text": "图3", "type": "fig", "rid": "F3", "data": [ { "name": "text", "data": "图3" } ] } }, { "name": "text", "data": "（a）、（b）分别为光纤截面x轴上无沟槽和有沟槽19芯光纤中五个相邻纤芯的光传输模拟，" }, { "name": "xref", "data": { "text": "图3", "type": "fig", "rid": "F3", "data": [ { "name": "text", "data": "图3" } ] } }, { "name": "text", "data": "（a）可以看出光入射到无沟槽19芯光纤的其中一个纤芯时其相邻纤芯中也有能量分布，而" }, { "name": "xref", "data": { "text": "图3", "type": "fig", "rid": "F3", "data": [ { "name": "text", "data": "图3" } ] } }, { "name": "text", "data": "（b）中有沟槽结构的19芯光纤纤芯的能量则几乎被完全束缚在中间纤芯中，同时这种沟槽结构有效地均衡了每个纤芯中的能量分布。结果表明，沟槽的存在可以极大地减小相邻纤芯的能量交叠进而减小XT。" } ] }, { "name": "fig", "data": { "id": "F3", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图3" } ], "title": [ { "name": "text", "data": "光纤截面x轴上各纤芯的能量分布。（a）无沟槽；（b）有沟槽" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.3" } ], "title": [ { "name": "text", "data": "Energy distribution in the fiber core. （a）Without trench； （b）With trench" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153779&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153781&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153780&type=", "width": "141.40528870", "height": "56.96849823", "fontsize": "" } ] } } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2.3.2　内包层厚度及沟槽宽度对XT的影响" } ], "level": "3", "id": "s2c2" } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "图4", "type": "fig", "rid": "F4", "data": [ { "name": "text", "data": "图4" } ] } }, { "name": "text", "data": "研究了" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=4.5、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=0.35%、" }, { "name": "italic", "data": [ { "name": "text", "data": "n" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=2.0337、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=-0.35%、" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=40μm的条件下，内包层厚度及沟槽厚度对XT的影响。" }, { "name": "xref", "data": { "text": "图4", "type": "fig", "rid": "F4", "data": [ { "name": "text", "data": "图4" } ] } }, { "name": "text", "data": "（a）的结果表明内包层厚度在0.5~6μm变化时，XT呈现急剧下降的趋势并在4μm后最终趋于不变。从" }, { "name": "xref", "data": { "text": "图4", "type": "fig", "rid": "F4", "data": [ { "name": "text", "data": "图4" } ] } }, { "name": "text", "data": "（b）可以看出，随着沟槽宽度的增加，XT呈现线性下降的趋势。由于相邻沟槽之间的距离需要大于3μm" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "23", "type": "bibr", "rid": "R23", "data": [ { "name": "text", "data": "23" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "，在这个限制范围内，沟槽越宽串扰抑制特性越好，因此" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "=4.5μm时已满足光纤的低串扰要求。" } ] }, { "name": "fig", "data": { "id": "F4", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图4" } ], "title": [ { "name": "text", "data": "XT随（a）内包层厚度和（b）沟槽宽度的变化" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.4" } ], "title": [ { "name": "text", "data": "Variation of XT with （a）inner cladding thickness and （b）trench width" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153782&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153784&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153783&type=", "width": "140.09124756", "height": "56.99435425", "fontsize": "" } ] } } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2.3.3　芯包折射率差∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "及沟槽深度∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "对XT的影响" } ], "level": "3", "id": "s2c3" } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "图5", "type": "fig", "rid": "F5", "data": [ { "name": "text", "data": "图5" } ] } }, { "name": "text", "data": "（a）、（b）分别探究了在" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=4.5μm、" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "=4.5μm、" }, { "name": "italic", "data": [ { "name": "text", "data": "n" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "0" } ] }, { "name": "text", "data": "=2.0337的条件下不同∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "和∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "的XT随着纤芯间距的变化情况。" }, { "name": "xref", "data": { "text": "图5", "type": "fig", "rid": "F5", "data": [ { "name": "text", "data": "图5" } ] } }, { "name": "text", "data": "（a）表明在相同的纤芯间距条件下，∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "越大，XT越小，这是由于小的∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "对光的束缚能力弱，如插图光斑所示，因此选择∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=0.49%的掺铒碲酸盐玻璃作为纤芯。" }, { "name": "xref", "data": { "text": "图5", "type": "fig", "rid": "F5", "data": [ { "name": "text", "data": "图5" } ] } }, { "name": "text", "data": "（b）表明∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "越大，XT越小，即增大沟槽深度可以抑制XT，因此选择∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=-0.54%的掺铒碲酸盐玻璃作为纤芯。同时两图对比可以看出，相对于沟槽材质来说，纤芯材质对于XT的影响更大。" } ] }, { "name": "fig", "data": { "id": "F5", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图5" } ], "title": [ { "name": "text", "data": "不同（a）∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "和（b）∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "下XT随纤芯间距的变化" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.5" } ], "title": [ { "name": "text", "data": "Variation of XT with core pitch under different （a）∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": " and （b）∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153785&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153787&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153786&type=", "width": "129.57495117", "height": "51.00201416", "fontsize": "" } ] } } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2.3.4　纤芯半径对XT的影响" } ], "level": "3", "id": "s2c4" } }, { "name": "fig", "data": { "id": "F6", "caption": [ { "lang": "zh", "title": [] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153788&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153790&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153789&type=", "width": "77.79583740", "height": "134.39753723", "fontsize": "" } ] } }, { "name": "p", "data": [ { "name": "text", "data": "图6（a）探究了在" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "=4.5μm、" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=40μm、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=0.49%、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=-0.54%的条件下XT随着纤芯半径的变化。可以看出，随着纤芯半径的增大，XT呈现先减小后增大的趋势，且在5μm时出现最小值。但图6（b）的归一化频率表明此时光纤为少模传输，相邻纤芯间存在芯间串扰的同时还有模间串扰。图6（b）中黑色曲线表明r1≤2.9μm时归一化频率V＜2.405，符合单模传输条件。因此选择" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "text", "data": "=2.9μm作为最佳的纤芯半径参数，此时的串扰值为-156dB/100m。" } ] } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "2.3.5　弯曲半径对XT的影响" } ], "level": "3", "id": "s2c5" } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "图7", "type": "fig", "rid": "F7", "data": [ { "name": "text", "data": "图7" } ] } }, { "name": "text", "data": "研究了在r" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=3.4μm、" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "=4.5μm、" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=40μm、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=0.49%、∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=-0.54%的条件下弯曲半径对XT的影响，从中可以看出，XT随着弯曲半径" }, { "name": "italic", "data": [ { "name": "text", "data": "R" }, { "name": "sub", "data": [ { "name": "text", "data": "b" } ] } ] }, { "name": "text", "data": "的增大而逐渐减小。" } ] }, { "name": "fig", "data": { "id": "F7", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图7" } ], "title": [ { "name": "text", "data": "XT随弯曲半径的变化" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.7" } ], "title": [ { "name": "text", "data": "Variation of XT with bending radius" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153791&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153793&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153792&type=", "width": "77.69583130", "height": "65.06834412", "fontsize": "" } ] } } ] } ] } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "3　最优结构下的其他光学性能" } ], "level": "1", "id": "s3" } }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "3.1　色散" } ], "level": "2", "id": "s3a" } }, { "name": "p", "data": [ { "name": "text", "data": "色散是光脉冲展宽的主要原因，会限制光纤的传输容量、传输带宽和传输距离。" }, { "name": "xref", "data": { "text": "图8", "type": "fig", "rid": "F8", "data": [ { "name": "text", "data": "图8" } ] } }, { "name": "text", "data": "为光纤总色散的模拟，曲线表明增加沟槽结构使色散曲线略有升高，但沟槽结构不会破坏光纤的色散性能。色散系数可以通过以下公式计算" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "25", "type": "bibr", "rid": "R25", "data": [ { "name": "text", "data": "25" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "：" } ] }, { "name": "dispformula", "data": { "label": [ { "name": "text", "data": "（3）" } ], "data": [ { "name": "math", "data": { "math": "", "graphicsData": { "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153795&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153794&type=", "width": "27.85533524", "height": "8.12800026", "fontsize": "" } } }, { "name": "text", "data": " " } ], "id": "DF3" } }, { "name": "p", "data": [ { "name": "text", "data": "其中，Re(" }, { "name": "italic", "data": [ { "name": "text", "data": "n" }, { "name": "sub", "data": [ { "name": "text", "data": "eff" } ] } ] }, { "name": "text", "data": ")为有效模式折射率的实部，" }, { "name": "italic", "data": [ { "name": "text", "data": "c" } ] }, { "name": "text", "data": "为真空中的光速。" } ] }, { "name": "fig", "data": { "id": "F8", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图8" } ], "title": [ { "name": "text", "data": "色散" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.8" } ], "title": [ { "name": "text", "data": "Dispersion" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153796&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153798&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153797&type=", "width": "77.69583130", "height": "62.19014359", "fontsize": "" } ] } } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "3.2　弯曲损耗" } ], "level": "2", "id": "s3b" } }, { "name": "p", "data": [ { "name": "text", "data": "光纤弯曲会使纤芯中的能量泄漏到包层，不仅会导致损耗的增加还会导致XT的增加。" }, { "name": "xref", "data": { "text": "图9", "type": "fig", "rid": "F9", "data": [ { "name": "text", "data": "图9" } ] } }, { "name": "text", "data": "计算了外层纤芯、次外层纤芯和中心纤芯的弯曲损耗（" }, { "name": "italic", "data": [ { "name": "text", "data": "BL" } ] }, { "name": "text", "data": "）随纤芯间距的变化。可以发现，外层纤芯的" }, { "name": "italic", "data": [ { "name": "text", "data": "BL" } ] }, { "name": "text", "data": "随纤芯间距的增大变化最明显，在" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=40μm之后呈指数型增长，因此40μm的纤芯间距也是" }, { "name": "xref", "data": { "text": "图2", "type": "fig", "rid": "F2", "data": [ { "name": "text", "data": "图2" } ] } }, { "name": "text", "data": "的最佳选择参数。说明外层纤芯到包层边缘的距离需要≥30μm才能减小外层纤芯能量的泄露" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "23", "type": "bibr", "rid": "R23", "data": [ { "name": "text", "data": "23" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "。次外层纤芯和中心纤芯的变化小，均保持较低的" }, { "name": "italic", "data": [ { "name": "text", "data": "BL" } ] }, { "name": "text", "data": "值。弯曲损耗可以表示为" }, { "name": "sup", "data": [ { "name": "text", "data": "[" }, { "name": "xref", "data": { "text": "3", "type": "bibr", "rid": "R3", "data": [ { "name": "text", "data": "3" } ] } }, { "name": "text", "data": ", " }, { "name": "xref", "data": { "text": "7", "type": "bibr", "rid": "R7", "data": [ { "name": "text", "data": "7" } ] } }, { "name": "text", "data": ", " }, { "name": "xref", "data": { "text": "24", "type": "bibr", "rid": "R24", "data": [ { "name": "text", "data": "24" } ] } }, { "name": "text", "data": "]" } ] }, { "name": "text", "data": "：" } ] }, { "name": "dispformula", "data": { "label": [ { "name": "text", "data": "（4）" } ], "data": [ { "name": "math", "data": { "math": "", "graphicsData": { "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153800&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153799&type=", "width": "40.38600159", "height": "8.46666718", "fontsize": "" } } }, { "name": "text", "data": " " } ], "id": "DF4" } }, { "name": "p", "data": [ { "name": "text", "data": "其中，" }, { "name": "italic", "data": [ { "name": "text", "data": "imag" } ] }, { "name": "text", "data": "(" }, { "name": "italic", "data": [ { "name": "text", "data": "n" }, { "name": "sub", "data": [ { "name": "text", "data": "eff" } ] } ] }, { "name": "text", "data": ")为模式有效折射率的虚部。" } ] }, { "name": "fig", "data": { "id": "F9", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图9" } ], "title": [ { "name": "text", "data": "弯曲损耗随纤芯间距的变化" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.9" } ], "title": [ { "name": "text", "data": "Variation of bending loss with core pitch" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153801&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153803&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153802&type=", "width": "77.69583130", "height": "63.53894424", "fontsize": "" } ] } } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "3.3　C+L波段的XT" } ], "level": "2", "id": "s3c" } }, { "name": "p", "data": [ { "name": "xref", "data": { "text": "图10", "type": "fig", "rid": "F10", "data": [ { "name": "text", "data": "图10" } ] } }, { "name": "text", "data": "为XT随波长的变化。曲线表明随波长的增大，XT逐渐变大，说明XT受波长影响较大。但在C+L波段的串扰值仍低于-60dB/100m，因此符合低串扰传输的要求。" } ] }, { "name": "fig", "data": { "id": "F10", "caption": [ { "lang": "zh", "label": [ { "name": "text", "data": "图10" } ], "title": [ { "name": "text", "data": "XT随波长的变化" } ] }, { "lang": "en", "label": [ { "name": "text", "data": "Fig.10" } ], "title": [ { "name": "text", "data": "Variation of bending loss with wavelength" } ] } ], "subcaption": [], "note": [], "graphics": [ { "print": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153804&type=", "small": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153806&type=", "big": "http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=37153805&type=", "width": "77.69583130", "height": "61.11120987", "fontsize": "" } ] } } ] } ] }, { "name": "sec", "data": [ { "name": "sectitle", "data": { "title": [ { "name": "text", "data": "4　结　　论" } ], "level": "1", "id": "s4" } }, { "name": "p", "data": [ { "name": "text", "data": "针对挤压制备型碲酸盐玻璃19芯光纤的XT问题，我们采用了易于光纤成型的沟槽辅助型结构来进行有效的串扰抑制并对光纤的主要参数进行整体优化。数值结果表明，当纤芯半径" }, { "name": "italic", "data": [ { "name": "text", "data": "r" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=2.9μm、沟槽宽度" }, { "name": "italic", "data": [ { "name": "text", "data": "W" } ] }, { "name": "sub", "data": [ { "name": "text", "data": "t" } ] }, { "name": "text", "data": "=4.5μm、纤芯间距" }, { "name": "italic", "data": [ { "name": "text", "data": "Λ" } ] }, { "name": "text", "data": "=40μm、芯包折射率差∆" }, { "name": "sub", "data": [ { "name": "text", "data": "1" } ] }, { "name": "text", "data": "=0.49%且沟槽深度∆" }, { "name": "sub", "data": [ { "name": "text", "data": "2" } ] }, { "name": "text", "data": "=-0.54%时，该光纤在1550nm波长处拥有-156dB/100m的低串扰值。基于本实验室团队先前的挤压制备基础，未来我们将基于低串扰的碲酸盐玻璃MCF来进行光纤制备，满足未来的多路宽带光纤信号放大应用。" } ] } ] } ], "footnote": [], "reflist": { "title": [ { "name": "text", "data": "参考文献" } ], "data": [ { "id": "R1", "label": "1", "citation": [ { "lang": "en", "text": [ { "name": "text", "data": "SAKAMOTO T" }, { "name": "text", "data": "， " }, { "name": 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