技术领域technical field
本发明涉及一种用于光纤通信系统的低衰减少模光纤，该光纤的纤芯具有阶梯型剖面结构，其在1550nm通讯波段支持的四个模式有较低的差分模群时延(DGD)、较低的衰减和较好的抗弯曲性能，属于光纤通信技术领域。The invention relates to a low-attenuation reduced-mode optical fiber used in an optical fiber communication system. The fiber core of the optical fiber has a stepped cross-section structure, and the four modes supported by it in the 1550nm communication band have lower differential mode group delay (DGD) , lower attenuation and better bending resistance, belonging to the technical field of optical fiber communication.
背景技术Background technique
单模光纤由于其传输速率快，携带信息容量大，传输距离远等优点，被广泛地应用于光纤通信网络之中。而近年来，随着通信及大数据业务对容量的需求与日俱增，网络带宽快速扩张，光传输网络的容量正逐步接近单根光纤的香农极限：100Tb/s。空分复用和模分复用技术可以打破传统的香农极限，实现更高带宽的传输，是解决传输容量问题的最好方法。支持此复用技术的光纤即多芯光纤和少模光纤。实验表明，使用少模光纤结合MIMO技术能够在一个以上的空间传播模式下传输信号。并且MIMO技术能够补偿模式间的相互耦合，在接收端将各个空间模式分离开来。美国专利US8948559、US8848285、US8837892、US8705922以及中国专利CN104067152、CN103946729等提出了抛物线型或阶跃型剖面的少模光纤，但它们各自存在优缺点。具有阶跃型剖面的少模光纤制造工艺简单，易于实现大批量生产，但其通常具有较大的DGD，甚至高达几千ps/km【S.Matsuo,Y.Sasaki,I.Ishida,K.Takenaga,et al.,“Recent Progress on Multi-Core Fiber and Few-Mode Fiber”OFC 2013,OM3I.3(2013)】。抛物线型剖面的少模光纤有更多的可调节参数从而使得模间串扰和DGD均达到很低的水平，但其制备工艺复杂，alpha参数难以精确均匀地控制，可重复性不高。且折射率剖面沿预制棒轴向上的微小波动就能造成光纤不同段长处DGD的明显变化。为了克服上述问题，需要发明一种少模光纤，其具有较小的DGD而且能够通过简单的工艺进行重复性制备。Single-mode optical fibers are widely used in optical fiber communication networks due to their advantages such as fast transmission rate, large information carrying capacity, and long transmission distance. In recent years, with the increasing demand for capacity of communication and big data services, the network bandwidth has rapidly expanded, and the capacity of optical transmission networks is gradually approaching the Shannon limit of a single optical fiber: 100Tb/s. Space-division multiplexing and mode-division multiplexing technologies can break the traditional Shannon limit and achieve higher bandwidth transmission, which is the best way to solve the problem of transmission capacity. The fibers that support this multiplexing technology are multi-core fibers and few-mode fibers. Experiments have shown that the use of few-mode fibers combined with MIMO technology enables the transmission of signals in more than one spatial propagation mode. And MIMO technology can compensate for the mutual coupling between modes, and separate each spatial mode at the receiving end. US patents US8948559, US8848285, US8837892, US8705922 and Chinese patents CN104067152 and CN103946729 have proposed few-mode fibers with parabolic or step-shaped profiles, but they each have advantages and disadvantages. Few-mode optical fibers with a step profile are simple to manufacture and easy to mass-produce, but they usually have a large DGD, even as high as several thousand ps/km【S.Matsuo, Y.Sasaki, I.Ishida, K. Takenaga, et al., "Recent Progress on Multi-Core Fiber and Few-Mode Fiber" OFC 2013, OM3I.3(2013)]. The few-mode fiber with parabolic profile has more adjustable parameters, so that the intermode crosstalk and DGD can reach a very low level, but its preparation process is complicated, and the alpha parameter is difficult to control accurately and uniformly, and the repeatability is not high. Moreover, slight fluctuations in the refractive index profile along the axis of the preform can cause significant changes in the DGD at different lengths of the optical fiber. In order to overcome the above-mentioned problems, it is necessary to invent a few-mode optical fiber, which has a small DGD and can be reproducibly prepared through a simple process.
另一方面，随着光放大技术的进一步发展，光纤通信系统正向着更高传输功率和更长传输距离的方向发展。作为光纤通信系统中的重要传输媒质，光纤的相关性能也必须有进一步的提升，以满足光纤通信系统实际发展的需要。衰减和模场直径是单模光纤的两个重要的性能指标。光纤的衰减越小，光信号在这种媒质中的传输距离越长，光通信系统的无中继距离也越长，从而能显著减少中继站数量，在提高通信系统可靠性的同时使得建设和维护成本大幅降低；光纤的模场直径越大，有效面积就越大，则其非线性效应就越弱。大有效面积可以有效地抑制自相位调制、四波混频、交叉相位调制等非线性效应，保证高功率光信号的传输质量。降低衰减和增大有效面积可以有效地提高光纤通信系统中的光信噪比，进一步提高系统的传输距离和传输质量。对单模光纤而言，光纤的衰减系数可以用公式(1)表示：On the other hand, with the further development of optical amplification technology, the optical fiber communication system is developing towards higher transmission power and longer transmission distance. As an important transmission medium in optical fiber communication systems, the performance of optical fibers must be further improved to meet the needs of the actual development of optical fiber communication systems. Attenuation and mode field diameter are two important performance indicators of single-mode fiber. The smaller the attenuation of the optical fiber, the longer the transmission distance of the optical signal in this medium, and the longer the non-relay distance of the optical communication system, which can significantly reduce the number of relay stations, and make the construction and maintenance of the communication system more reliable while improving the reliability of the communication system. The cost is greatly reduced; the larger the mode field diameter of the fiber, the larger the effective area, and the weaker the nonlinear effect. The large effective area can effectively suppress nonlinear effects such as self-phase modulation, four-wave mixing, and cross-phase modulation, ensuring the transmission quality of high-power optical signals. Reducing the attenuation and increasing the effective area can effectively improve the optical signal-to-noise ratio in the optical fiber communication system, and further improve the transmission distance and transmission quality of the system. For single-mode fiber, the attenuation coefficient of the fiber can be expressed by formula (1):
α＝R/λ4+αIR+αIM+αOH+αUV+B (1)α＝R/λ4 +αIR +αIM +αOH +αUV +B (1)
其中R为瑞利散射系数,αIR,αIM,αOH,αUV分别代表红外吸收，缺陷衰减，OH吸收，以及紫外吸收。在光纤材料中，由于某种远小于波长的不均匀性引起光的散射构成光纤的散射损耗。其中瑞利散射为三种散射机理之一，为线性散射(不产生频率的变化)。瑞利散射的特点是与波长的四次方成反比，由其引起的损耗与掺杂材料的种类与浓度有关。对于少模光纤，可认为光纤中的每一个模式的衰减系数都遵循上述公式(1)。Where R is the Rayleigh scattering coefficient, αIR , αIM , αOH , and αUV represent infrared absorption, defect attenuation, OH absorption, and ultraviolet absorption, respectively. In the fiber material, the scattering loss of the fiber is caused by the scattering of light due to some inhomogeneity much smaller than the wavelength. Among them, Rayleigh scattering is one of the three scattering mechanisms, which is linear scattering (no frequency change). The characteristic of Rayleigh scattering is inversely proportional to the fourth power of the wavelength, and the loss caused by it is related to the type and concentration of doping materials. For a few-mode fiber, it can be considered that the attenuation coefficient of each mode in the fiber follows the above formula (1).
在光纤预制棒的制造过程中一般可以采用以下几种方法来降低光纤衰减。比如，采用更高纯度的原材料，提高生产环境和设备密封性能，降低外界杂质引入的几率。或者，采用更大外径的预制棒制造工艺，通过大尺寸预制棒的稀释效应降低光纤的整体衰减。另外，在光纤制造过程中，裸光纤表面涂层的涂覆工艺也是影响光纤衰减性能的一个重要因素。但是，无论从理论上还是实际光纤制备中的成本和工艺控制上来讲，降低光纤的掺杂并优化光纤的剖面是最简单且有效的降低光纤衰减的方法。一般来说，掺杂材料的浓度越低，则瑞利散射所引起的损耗越小。通过优化芯层直径和掺氟浓度等参数，不仅可以增大单模光纤的有效面积，而且可以有效的降低光纤中瑞利散射等造成损耗，是一种有效可靠的降低光纤衰减的方法。In the manufacturing process of optical fiber preform, the following methods can generally be used to reduce optical fiber attenuation. For example, use higher purity raw materials to improve the sealing performance of the production environment and equipment, and reduce the chance of foreign impurities being introduced. Alternatively, a preform manufacturing process with a larger outer diameter is used to reduce the overall attenuation of the optical fiber through the dilution effect of the large-size preform. In addition, in the optical fiber manufacturing process, the coating process of the bare optical fiber surface coating is also an important factor affecting the attenuation performance of the optical fiber. However, reducing the doping of the fiber and optimizing the profile of the fiber are the simplest and most effective ways to reduce the attenuation of the fiber, both in theory and in terms of cost and process control in actual fiber preparation. In general, the lower the concentration of dopant material, the smaller the loss due to Rayleigh scattering. By optimizing parameters such as core diameter and fluorine doping concentration, not only can the effective area of single-mode fiber be increased, but also the loss caused by Rayleigh scattering in the fiber can be effectively reduced, which is an effective and reliable method to reduce fiber attenuation.
发明内容Contents of the invention
本发明所要解决的技术问题在于在克服上述现有技术存在的不足提供一种低衰减少模光纤，其既具有较小的DGD(差分模群时延)又工艺简单便于制作，同时，还具有较低的衰减和较好的抗弯曲性能。The technical problem to be solved by the present invention is to provide a low-attenuation multi-mode optical fiber in order to overcome the above-mentioned deficiencies in the prior art, which not only has a small DGD (differential mode group delay) but also has a simple process and is easy to manufacture. At the same time, it also has Lower attenuation and better resistance to bending.
为方便介绍发明内容，定义如下术语：For the convenience of introducing the content of the invention, the following terms are defined:
预制棒：是由芯层和包层组成的径向折射率分布符合光纤设计要求可直接拉制成所设计光纤的玻璃棒或组合体；Preform rod: It is a glass rod or assembly composed of a core layer and a cladding layer whose radial refractive index distribution meets the design requirements of the optical fiber and can be directly drawn into the designed optical fiber;
芯棒：含有芯层和部分包层的实心玻璃预制件；Core Rod: A solid glass preform with a core and partial cladding;
半径：该层外边界与中心点之间的距离；Radius: the distance between the outer boundary of the layer and the center point;
折射率剖面：光纤或光纤预制棒(包括芯棒)玻璃折射率与其半径之间的关系；Refractive index profile: the relationship between the optical fiber or optical fiber preform (including the core rod) glass refractive index and its radius;
相对折射率差：
ni和n0分别为各对应光纤各部分的折射率和纯二氧化硅玻璃的折射率；ni and n0 are the refractive index of each part of the corresponding optical fiber and the refractive index of pure silica glass;
氟(F)的贡献量：掺氟(F)石英玻璃相对于纯石英玻璃的相对折射率差值(ΔF)，以此来表示掺氟(F)量；Contribution of fluorine (F): the relative refractive index difference (ΔF) between fluorine (F) quartz glass and pure quartz glass, which is used to express the amount of fluorine (F);
锗(Ge)的贡献量：掺锗(Ge)石英玻璃相对于纯石英玻璃的相对折射率差值(ΔGe)，以此来表示掺锗(Ge)量；Contribution of germanium (Ge): the relative refractive index difference (ΔGe) of germanium (Ge) doped quartz glass relative to pure quartz glass, which is used to express the amount of germanium (Ge) doped;
OVD工艺：用外部气相沉积和烧结工艺制备所需厚度的石英玻璃；OVD process: prepare quartz glass with required thickness by external vapor deposition and sintering process;
VAD工艺：用轴向气相沉积和烧结工艺制备所需厚度的石英玻璃；VAD process: prepare quartz glass with required thickness by axial vapor deposition and sintering process;
APVD外包工艺：用高频等离子体焰将天然或合成石英粉熔制于芯棒表面制备所需厚度的SiO2玻璃；APVD outsourcing process: use high-frequency plasma flame to melt natural or synthetic quartz powder on the surface of core rod to prepareSiO2 glass with required thickness;
裸光纤：指光纤中不含涂覆层的玻璃丝。Bare optical fiber: refers to the glass filament without coating in the optical fiber.
本发明为解决上述提出的问题所采用的技术方案为：The technical scheme that the present invention adopts for solving the above-mentioned problem is:
包括有芯层和包层，其特征在于所述芯层为三层，芯层外由内向外有三层包层；所述的三层芯层剖面结构中，第一芯层的相对折射率差Δ1为0.34％～0.45％，半径R1为4.5μm～7.5μm，第二芯层的相对折射率差Δ2为0.20％～0.29％，半径R2为8μm～10μm，第三芯层的相对折射率差Δ3为0.15％～0.24％，半径R3为10μm～13μm，所述的包层剖面结构中，第一包层为紧密围绕芯层的内包层，其相对折射率差Δ4为-0.02％～0.02％，半径R4为14μm～18μm，第二包层为下陷包层，紧密围绕内包层，其相对折射率差Δ5为-0.8％～-0.4％，半径R5为19μm～31μm，第三包层为紧密围绕下陷包层的外包层，为纯石英玻璃层。Including a core layer and a cladding layer, it is characterized in that the core layer is three layers, and there are three layers of cladding layers outside the core layer from inside to outside; in the cross-sectional structure of the three-layer core layer, the relative refractive index difference of the first core layer is Δ1 is 0.34% to 0.45%, the radius R1 is 4.5 μm to 7.5 μm, the relative refractive index difference Δ2 of the second core layer is 0.20% to 0.29%, the radius R2 is 8 μm to 10 μm, and the relative refractive index difference of the third core layer is Δ3 is 0.15% to 0.24%, and the radius R3 is 10 μm to 13 μm. In the cladding section structure, the first cladding is an inner cladding that closely surrounds the core layer, and its relative refractive index difference Δ4 is -0.02% to 0.02%. , the radius R4 is 14 μm to 18 μm, the second cladding is a depressed cladding, closely surrounds the inner cladding, its relative refractive index difference Δ5 is -0.8% to -0.4%, the radius R5 is 19 μm to 31 μm, and the third cladding is tight The outer cladding surrounding the sunken cladding is a layer of pure quartz glass.
按上述方案，所述的芯层呈阶梯型，且相对折射率差由内向外递减。According to the above solution, the core layer is stepped, and the relative refractive index difference decreases from inside to outside.
按上述方案，所述的每个芯层均由掺氟(F)和锗(Ge)的石英玻璃，或掺有氟(F)及其他掺杂剂的石英玻璃组成，芯层氟(F)的贡献量ΔF为-0.06％±0.02％。According to the above scheme, each of the core layers is composed of quartz glass doped with fluorine (F) and germanium (Ge), or quartz glass doped with fluorine (F) and other dopants, the core layer of fluorine (F) The contribution ΔF is -0.06%±0.02%.
按上述方案，所述的内包层由掺氟(F)和锗(Ge)的石英玻璃，或纯石英玻璃组成；所述的下陷包层由掺氟(F)的石英玻璃组成。According to the above solution, the inner cladding layer is composed of quartz glass doped with fluorine (F) and germanium (Ge), or pure quartz glass; the depressed cladding layer is composed of quartz glass doped with fluorine (F).
按上述方案，所述光纤在1550nm波长处支持四个稳定的传输模式，分别是LP01、LP11、LP21和LP02。According to the above solution, the optical fiber supports four stable transmission modes at a wavelength of 1550 nm, namely LP01, LP11, LP21 and LP02.
按上述方案，所述的LP01模式在1550nm波长处光纤的有效面积大于或等于135μm2；在1550nm波长处的色散值小于或等于22ps/km/nm。According to the above scheme, the effective area of the optical fiber at the wavelength of 1550nm of the LP01 mode is greater than or equal to 135μm2 ; the dispersion value at the wavelength of 1550nm is less than or equal to 22ps/km/nm.
按上述方案，所述光纤在1550nm波长处的DGD的绝对值的最大值小于或等于3.5ps/m，优选条件下小于或等于1ps/m。According to the above scheme, the maximum value of the absolute value of the DGD of the optical fiber at a wavelength of 1550 nm is less than or equal to 3.5 ps/m, preferably less than or equal to 1 ps/m.
按上述方案，所述光纤的四个模式在1550nm波长处的衰减系数均小于或等于0.21dB/km，优选条件下小于或等于0.20dB/km。According to the above solution, the attenuation coefficients of the four modes of the optical fiber at a wavelength of 1550nm are all less than or equal to 0.21dB/km, preferably less than or equal to 0.20dB/km.
按上述方案，所述光纤中LP02和LP21模式的截止波长大于1600nm，LP12或LP31模式的截止波长小于1500nm。According to the above solution, the cut-off wavelengths of the LP02 and LP21 modes in the optical fiber are greater than 1600 nm, and the cut-off wavelengths of the LP12 or LP31 modes are less than 1500 nm.
本发明的有益效果在于：1.相对于阶跃型折射率剖面的少模光纤，该光纤具有较低的DGD值，甚至可以和渐变折射率剖面少模光纤的DGD值相当。该光纤较阶跃型折射率剖面的少模光纤具有更低DGD的原因在于，其折射率分布随着芯层半径的增大而成梯度减小。相对于阶跃型少模光纤中高阶模式和低阶模式在光纤中传播的速度一样但走过的路径不同从而到达终点的时间不同，本发明少模光纤中的高价模式虽比低阶模式走的路径更长，但其所经过的外层芯层的折射率更小，因此在这部分路径中的传播速度较更快，从而高阶模式可以和低阶模式几乎同时达到终点。只要设计好各芯层的半径和折射率值，DGD值甚至可以和渐变折射率剖面少模光纤相当。2.在具有较低DGD值的同时，具有较简单的制备工艺，其制备工艺和阶跃型少模光纤基本一致，易于通过掺杂和层数的控制来实现两层或三层芯层，不会增加工艺难度或成本。3.本发明光纤的四个模式具有较低的衰减，从而可以在干线传输中，减少建设相关基站及其他系统设备的成本。衰减性能有赖于以下三个方面的因素：第一，阶梯减小的折射率分布，使得部分模场分布在折射率更低、掺杂更低的第二芯层或第三芯层中，如图1所示。这部分光的衰减相对于阶跃型少模光纤要低的多，有助于降低衰减；第二，芯层中同时掺杂氟和锗，使得芯层材料的粘度得到降低，可以匹配芯层与包层的粘度，从而在拉丝后光纤内部的残余应力进一步减小，有利于改善光纤的衰减性能；第三，由于芯层掺F量较少，从而达到同等Δ的掺Ge量也减少，杂质的减少使得衰减有效降低。The beneficial effects of the present invention are as follows: 1. Compared with the few-mode fiber with the step-type refractive index profile, the fiber has a lower DGD value, even comparable to the DGD value of the few-mode fiber with the graded-index profile. The reason why the fiber has a lower DGD than the few-mode fiber with a step-index profile is that its refractive index profile decreases gradually with the increase of the core radius. Compared with the high-order mode and the low-order mode in the step-type few-mode fiber, the speed of propagation in the fiber is the same, but the paths traveled are different and the time to reach the end is different. Although the high-order mode in the few-mode fiber of the present invention travels faster than the low-order mode The path is longer, but the refractive index of the outer core layer it passes through is smaller, so the propagation speed in this part of the path is faster, so that the high-order mode and the low-order mode can reach the end almost at the same time. As long as the radii and refractive index values of each core layer are well designed, the DGD value can even be comparable to the graded index profile few-mode fiber. 2. While having a lower DGD value, it has a relatively simple preparation process, and its preparation process is basically the same as that of a step-type few-mode fiber. It is easy to realize two-layer or three-layer core layers through doping and layer number control. No increase in process difficulty or cost. 3. The four modes of the optical fiber of the present invention have relatively low attenuation, thereby reducing the cost of building relevant base stations and other system equipment in trunk line transmission. The attenuation performance depends on the following three factors: First, the step-reduced refractive index distribution makes part of the mode field distribution in the second core layer or the third core layer with lower refractive index and lower doping, such as Figure 1 shows. The attenuation of this part of light is much lower than that of the step-type few-mode fiber, which helps to reduce the attenuation; second, the core layer is doped with fluorine and germanium at the same time, so that the viscosity of the core material is reduced, which can match the core layer And the viscosity of the cladding, so that the residual stress inside the fiber after drawing is further reduced, which is conducive to improving the attenuation performance of the fiber; third, because the core layer has less F doping, the amount of Ge doping to achieve the same Δ is also reduced, The reduction of impurities results in an effective reduction in attenuation.
附图说明Description of drawings
图1为本发明的阶梯型剖面的少模光纤在1550nm处四个模式的归一化场分布图。Fig. 1 is a normalized field distribution diagram of the four modes at 1550 nm of the few-mode optical fiber with the stepped section of the present invention.
图2为本发明一个实施例的径向截面示意图。图中00对应光纤的第一芯层，10对应光纤的第二芯层，20对应光纤的第三芯层，30对应光纤的内包层，40对应光纤的下陷包层，50对应光纤的外包层。Fig. 2 is a schematic radial cross-sectional view of an embodiment of the present invention. In the figure, 00 corresponds to the first core layer of the optical fiber, 10 corresponds to the second core layer of the optical fiber, 20 corresponds to the third core layer of the optical fiber, 30 corresponds to the inner cladding of the optical fiber, 40 corresponds to the depressed cladding of the optical fiber, and 50 corresponds to the outer cladding of the optical fiber .
图3为本发明的低衰减少模光纤的折射率剖面示意图。Fig. 3 is a schematic diagram of the refractive index profile of the low attenuation MMF of the present invention.
具体实施方式Detailed ways
下面结合实施例对本发明作进一步的详细说明。The present invention will be described in further detail below in conjunction with embodiment.
本实施例的裸光纤包括有三层芯层和三层包层，如图2所示。第一芯层00、第二芯层10和第三芯层20均由掺氟(F)和锗(Ge)的石英玻璃，或掺有氟及其他掺杂剂的石英玻璃组成，由PCVD工艺制备；围绕在芯层外有三个包层。内包层30紧密围绕芯层，由PCVD工艺制备的氟(F)和锗(Ge)共掺的石英玻璃组成，或由纯石英玻璃组成。下陷包层40紧密围绕内包层，由掺氟(F)的石英玻璃组成，其相对折射率差Δ5小于其它包层。外包层50为紧密围绕下陷包层的外包层。该包层为纯石英玻璃层，即相对折射率差为0％。图3给出了本实施例光纤的折射率剖面结构图。The bare optical fiber in this embodiment includes three core layers and three cladding layers, as shown in FIG. 2 . The first core layer 00, the second core layer 10 and the third core layer 20 are all composed of quartz glass doped with fluorine (F) and germanium (Ge), or quartz glass doped with fluorine and other dopants, and are formed by PCVD process. Preparation; three cladding layers surrounding the core layer. The inner cladding 30 closely surrounds the core layer and is composed of fluorine (F) and germanium (Ge) co-doped quartz glass prepared by PCVD process, or pure quartz glass. The depressed cladding 40 closely surrounds the inner cladding and is composed of fluorine (F)-doped quartz glass, and its relative refractive index difference Δ5 is smaller than that of other claddings. The outer cladding 50 is the outer cladding that closely surrounds the sunken cladding. The cladding layer is pure quartz glass layer, that is, the relative refractive index difference is 0%. Fig. 3 shows a cross-sectional structure diagram of the refractive index of the optical fiber of this embodiment.
本实施例光纤的涂覆层采用双层涂覆工艺，拉丝速度均为1000-2000m/min，光纤的丝径为125±0.7μm。The coating layer of the optical fiber in this embodiment adopts a double-layer coating process, the drawing speed is 1000-2000 m/min, and the fiber diameter is 125±0.7 μm.
按照上述少模光纤的技术方案，在其所规定的范围内对光纤的参数进行设计，并通过已知的PCVD工艺、MCVD工艺、OVD工艺或VAD工艺等芯棒制造工艺根据光纤的设计要求制造芯棒，通过套管工艺、OVD工艺或VAD工艺等外包工艺来完成整个预制棒的制造。According to the technical scheme of the above-mentioned few-mode optical fiber, the parameters of the optical fiber are designed within the specified range, and the mandrel manufacturing process such as the known PCVD process, MCVD process, OVD process or VAD process is manufactured according to the design requirements of the optical fiber Mandrel, the entire preform is manufactured through outsourcing processes such as casing process, OVD process or VAD process.
所拉制光纤的折射率剖面使用NR-9200设备(EXFO)进行测试，光纤的折射率剖面以及掺杂材料的主要参数如表1所示。The refractive index profile of the drawn optical fiber was tested using NR-9200 equipment (EXFO). The refractive index profile of the optical fiber and the main parameters of the dopant material are shown in Table 1.
所拉制光纤的主要性能参数如表2所示。The main performance parameters of the drawn optical fiber are shown in Table 2.
数据表明，按照本发明的技术方案所制造的光纤，其在1550nm波长处支持四个稳定的传输模式，分别是LP01，LP11，LP21和LP02。其中，LP01模式在1550nm波长处的有效面积大于135μm2；在1550nm处的色散值小于22ps/km/nm。该少模光纤在1550nm处的DGD的绝对值的最大值小于或等于3.5ps/m，优选条件下小于或等于1ps/m。四个模式在1550nm波长处的衰减系数均小于或等于0.21dB/km，优选条件下小于或等于0.20dB/km。LP02和LP21模式的截止波长大于1600nm，LP12或LP31模式的截止波长小于1500nm。The data shows that the optical fiber manufactured according to the technical solution of the present invention supports four stable transmission modes at a wavelength of 1550nm, namely LP01, LP11, LP21 and LP02. Among them, the effective area of the LP01 mode at 1550nm wavelength is greater than 135μm2 ; the dispersion value at 1550nm is less than 22ps/km/nm. The maximum absolute value of the DGD of the few-mode fiber at 1550 nm is less than or equal to 3.5 ps/m, preferably less than or equal to 1 ps/m. The attenuation coefficients of the four modes at a wavelength of 1550nm are all less than or equal to 0.21dB/km, preferably less than or equal to 0.20dB/km. The cut-off wavelength of LP02 and LP21 mode is greater than 1600nm, and the cut-off wavelength of LP12 or LP31 mode is less than 1500nm.
表1：本实施例少模光纤的结构和材料组成Table 1: The structure and material composition of the few-mode fiber in this embodiment
表2：本实施例少模光纤的主要性能参数Table 2: Main performance parameters of few-mode fiber in this embodiment
| Application Number | Priority Date | Filing Date | Title |
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| CN201510146111.8ACN104714273B (en) | 2015-03-31 | 2015-03-31 | Low decaying less fundamental mode optical fibre |
| Application Number | Priority Date | Filing Date | Title |
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| CN201510146111.8ACN104714273B (en) | 2015-03-31 | 2015-03-31 | Low decaying less fundamental mode optical fibre |
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| CN104714273Atrue CN104714273A (en) | 2015-06-17 |
| CN104714273B CN104714273B (en) | 2019-04-16 |
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| CN201510146111.8AActiveCN104714273B (en) | 2015-03-31 | 2015-03-31 | Low decaying less fundamental mode optical fibre |
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