CN102998742B - Anti-bending single mode fiber with small mode field - Google Patents

Anti-bending single mode fiber with small mode field Download PDF

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CN102998742B
CN102998742B CN 201210538228 CN201210538228A CN102998742B CN 102998742 B CN102998742 B CN 102998742B CN 201210538228 CN201210538228 CN 201210538228 CN 201210538228 A CN201210538228 A CN 201210538228A CN 102998742 B CN102998742 B CN 102998742B
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optical fiber
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CN102998742A (en
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汪松
王忠太
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长飞光纤光缆股份有限公司
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Abstract

本发明涉及一种小模场抗弯曲单模光纤,包括芯层和包层,其特征在于所述芯层的相对折射率差Δ1为0.9%~1.1%,芯层半径R1为2.4~3.0μm;围绕在芯层外有内、外两个包层;内包层相对折射率差Δ2为0%~-0.1%,内包层半径R2为9~12μm;内包层外为外包层。 The present invention relates to a small mode flexural mode optical fiber comprising a core and a cladding, wherein said core relative refractive index difference Δ1 is 0.9% to 1.1% of the core radius R1 of 2.4 ~ 3.0μm ; surrounded with an outer core inner and outer two cladding; an inner cladding relative refractive index difference Δ2 0% to 0.1%, a radius R2 of the inner cladding 9 ~ 12μm; outer cladding to the inner cladding layer. 本发明能有效将光信号约束在芯层中进行传播,同时在弯曲状态下,有效阻止光信号向外层传播,使光纤的抗弯曲性能得到极大提高,能在最小弯曲半径达到3mm的极小弯曲半径情况下使用;光纤的芯层和内包层掺杂有氟,使得芯层与包层材料的粘度失配问题得到改善,拉丝后光纤内部残余应力减少,可以改善光纤的衰减性能;本发明可在光纤器件中使用,增强光纤器件的运行能力。 The present invention is effectively constrained optical signal propagating in the core layer, while in the bent state, to effectively prevent the optical signals propagating layer, so that the bending resistance of the optical fiber is greatly improved, 3mm to achieve the minimum bend radius of the electrode using small bending radii; fiber core and inner cladding is doped with fluorine, so that the viscosity of the core layer and the cladding material mismatch is improved, after drawing to reduce the residual stresses inside the fiber, the fiber attenuation performance can be improved; the present invention can be used in optical devices, the enhanced operational capabilities of optical devices.

Description

一种小模场抗弯曲单模光纤 A small, single-mode fiber mode field flexural

技术领域 FIELD

[0001] 本发明涉及一种用于光通信系统的小模场抗弯曲单模光纤,该光纤具有极小的弯曲附加损耗,可在光纤器件中使用,属于光通信技术领域。 [0001] The present invention relates to a small mode field against one curved optical communication system for single-mode optical fiber having minimal additional bending loss, the optical fiber may be used in the device belonging to the field of optical communication technology.

背景技术 Background technique

[0002] 随着光通信技术的快速发展,单模光纤取代铜线已经大量应用于中短距离的控制系统中,在系统集成过程中人们对于器件小型化提出越来越高的要求,因此光纤的弯曲半径也要求越来越小,在很小的弯曲半径下,极低的弯曲附加损耗是非常重要的要求。 [0002] With the rapid development of optical communication technology, a large number of single-mode fiber has been applied to replace copper in the control system in a short distance, it is proposed for downsizing the device ever-increasing demands on system integration process, and therefore the optical fiber the smaller bending radius requirement, at a small bending radius, the additional low bending loss is a very important requirement. 在已使用的器件中要求光纤最小弯曲半径达到3_。 Required minimum bend radius in the fiber reaches 3_ device already used.

[0003] 通常改善单模光纤的抗弯曲性能有两种方式,一是减小光纤模场直径而同时保证截止波长,即保持一定的MAC值(模场直径与截止波长之比),MAC值越小,则弯曲损耗对应越小。 [0003] generally improves the bending resistance of single-mode fiber, there are two ways, one is to reduce the mode field diameter of the optical fiber while ensuring that the cutoff wavelength, i.e., to maintain a certain MAC value (than the mode field diameter and the cutoff wavelength), the MAC value the smaller the bending loss is smaller counterparts. 二是采用双包层结构来改善弯曲性能;或者是将内包层变成下陷包层,或者在内包层之外增加下陷包层,以保证较大的模场直径的同时,改善光纤的抗弯曲特性。 Second, the double clad structure to improve the bending properties; or inner cladding becomes depressed cladding or outside of the inner cladding increases while depressed cladding, in order to ensure a larger mode field diameter, improve the resistance to bending of the optical fiber characteristic. 后一种方法在弯曲不敏感光纤(即G.657光纤)中得到普遍应用。 The latter method widely used in bend-insensitive fibers (i.e., fibers G.657) in. 如中国专利CN101598834A,美国专利US7450807以及欧洲专利EP1978383等。 Chinese patent CN101598834A, US7450807 US patents and the European patent EP1978383 and so on. 在美国专利US7450807中,描述了一种通过加深下限环的低弯曲损耗光纤,但其抗弯曲性能仍属普通抗弯曲光纤的水平。 In U.S. Patent US7450807, there is described a method by deepening the lower limit of low bending loss of an optical fiber ring, but it is still common bending resistance against bending of the fiber level. 在专利TO2004/092794中,描述了一系列不同掺杂的低弯曲损耗单模光纤,但其大部分设计中IOmm直径的弯曲损耗已经大大增加,无法适应极小弯曲情况下的使用要求。 In Patent TO2004 / 092794, there is described a series of differently doped single mode optical fiber of low bending loss, but most of their design IOmm diameter bending loss has been greatly increased, can not meet the requirements in the case of a tight bend.

[0004] 在不要求与普通G.652光纤进行连接的应用场合,模场直径的匹配并不作为首要考虑的问题之一,因此小模场直径设计可以采用。 [0004] is not required in applications connected to the common G.652 fiber, does not match the mode field diameter as one of the primary consideration, and therefore the small mode field diameter designs may be employed.

发明内容 SUMMARY

[0005] 为方便介绍本发明内容,定义以下术语: [0005] For the convenience of description the present invention, the following terms are defined:

[0006] 折射率剖面:光纤中玻璃折射率与光纤半径之间的关系。 Refractive index profile [0006]: The relationship between the refractive index of the glass fiber and the optical fiber radius.

[0007]相对折射率差 [0007] The relative refractive index difference

Figure CN102998742BD00031

Hi 和% 分别为各对应部分的折射率和纯二氧化硅的折射率。 Hi% respectively and the refractive index and the corresponding portions of the respective pure silica.

[0008] 氟(F)的贡献量:掺氟(F)石英玻璃对于纯二氧化硅石英玻璃的相对折射率差(Λ F),以此表示掺氟(F)量。 [0008] The contribution of fluorine (F): The fluorine-doped (F) of quartz glass difference (Λ F) relative refractive index of pure silica quartz glass, fluorine-doped as an expression (F) amount.

[0009] 本发明所要解决的技术问题是针对上述现有技术存在的不足提供一种小模场抗弯曲单模光纤,该光纤具有极小的弯曲附加损耗,能在极小弯曲半径情况下使用。 [0009] The present invention solves the technical problem is to provide a small mode for anti disadvantages of the above prior art single mode optical fiber is bent, the optical fiber having a minimal additional bending loss, can be used in extremely small bending radii .

[0010] 本发明为解决上述提出的问题所采用的技术方案为:包括芯层和包层,其特征在于所述芯层的相对折射率差Al为0.9%~1.1%,芯层半径Rl为2.1~3.Ομίϋ;围绕在芯层外有内、外两个包层;内包层相对折射率差Λ2为0%~-0.1%,内包层半径R2为扩12μπι;内包层外为外包层。 [0010] aspect of the present invention is to solve the problems set forth above is employed: a core and a cladding, wherein said core relative refractive index difference Al is 0.9% to 1.1% of the core radius Rl 2.1 ~ 3.Ομίϋ; has an outer core layer surrounding the inner and outer cladding two; outer cladding to the inner cladding layer; an inner cladding relative refractive index difference Λ2 0% to 0.1%, a radius R2 of the inner cladding expanded 12μπι.

[0011] 按上述方案,所述的芯层由掺锗的石英玻璃、或锗氟共掺石英玻璃、或锗及其它掺杂剂共掺的石英玻璃组成;芯层中锗的贡献量AGe为0.9%~1.1 %,氟(F)的贡献量AF等于或低于-0.1 %。 [0011] In the above-described embodiment, the core layer of germanium-doped quartz glass, fluorine or germanium co-doped quartz glass, germanium, and other dopant or co-doped quartz glass; of germanium in the core as the contribution of AGe 0.9% to 1.1%, the contribution of the amount of fluorine (F) is equal to or less than -0.1% AF.

[0012] 按上述方案,所述的内包层由掺氟或锗氟共掺的石英玻璃组成,内包层半径R2与芯层半径Rl的比值R2/R1为1-4.5,内包层相对折射率差Λ 2与芯层相对折射率差Λ I的差值(Λ 1-Δ 2)为1.0%至1.16%。 [0012] In the above-described embodiment, the inner cladding of fluorine-doped with fluorine or germanium co-doped quartz glass, the inner cladding ratio of the core radius Rl and radius R2 of R2 / R1 is from 1 to 4.5, the relative refractive index difference of the inner cladding the difference Λ 2 Λ I core relative refractive index difference of (Λ 1-Δ 2) of from 1.0 to 1.16%.

[0013] 按上述方案,所述的外包层由纯石英玻璃组成。 [0013] In the above-described embodiment, the outer layer is made of pure quartz glass.

[0014] 按上述方案,所述的单模光纤在1310nm波长处的衰减系数小于或等于0.52dB/km ;在1310nm波长处的模场直径为4.5~5.5 μ m ; [0014] The above-described embodiment, the single mode fiber is less than or equal to 0.52dB / km in the attenuation coefficient at a wavelength of 1310nm; mode field diameter at a wavelength of 1310nm is 4.5 ~ 5.5 μ m;

[0015] 按上述方案,所述的单模光纤在1550nm波长处的衰减系数小于或等于0.30dB/km ;在1550nm波长处的模场直径为5.5um至6.5 μ m。 [0015] In the above-described embodiment, the single mode fiber is less than or equal to 0.30dB / km in the attenuation coefficient at a wavelength of 1550nm; mode field diameter at a wavelength of 1550nm is 5.5um to 6.5 μ m.

[0016] 按上述方案,所述的单模光纤具有小于或等于1260nm的光缆截止波长。 [0016] The above-described embodiment, the single mode fiber has a cable cutoff wavelength less than or equal to 1260nm.

[0017] 按上述方案,所述的单模光纤在1550nm波长处,对于围绕3mm弯曲半径饶一圈弯曲附加损耗小于或等于0.1dB,对于围绕5mm弯曲半径饶一圈弯曲附加损耗小于或等于 [0017] The above-described embodiment, the single mode fiber at a wavelength of 1550 nm, for additional bending Rao circle around 3mm radius bend losses less than or equal to 0.1dB, for additional bending Rao circle radius bending loss is about 5mm or less

0.05dB,对于围绕7.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.01dB,对于围绕IOmm弯曲半径饶一圈弯曲附加损耗小于或等于0.005dB,对于围绕15mm弯曲半径饶十圈弯曲附加损耗小于或等于0.002dB。 0.05dB, for a bending radius of around 7.5mm Rao circle additional bending loss is equal to or less than 0.01dB, Rao circle for additional bending loss around IOmm bend radius equal to or smaller than 0.005dB, for a bending radius of around 15mm Rao additional bending loss is less than ten laps or equal to 0.002dB.

[0018] 按上述方案, 所述的单模光纤在1625nm波长处,对于围绕3mm弯曲半径饶一圈弯曲附加损耗小于或等于0.2dB,对于围绕5_弯曲半径饶一圈弯曲附加损耗小于或等于 [0018] The above-described embodiment, the single mode optical fiber at the wavelength of 1625 nm, for additional bending Rao circle around 3mm radius bend losses less than or equal to 0.2dB, for a bending radius RAO circle around 5_ additional bending loss is less than or equal to

0.ldB,对于围绕7.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.02dB,对于围绕IOmm弯曲半径饶一圈弯曲附加损耗小于或等于0.005dB,对于围绕15mm弯曲半径饶十圈弯曲附加损耗小于或等于0.005dB。 0.ldB, Rao circle for additional bending radius of around 7.5mm bending losses less than or equal to 0.02dB, Rao circle for additional bending loss around IOmm bend radius equal to or smaller than 0.005dB, bending around a bending radius of 15mm Rao ten laps additional losses less than or equal 0.005dB.

[0019] 本发明的有益效果在于:1、芯层掺杂锗的贡献量大,能有效将光信号约束在芯层中进行传播,同时在弯曲状态下,有效阻止光信号向外层传播,使光纤的抗弯曲性能得到极大提高,能在最小弯曲半径达到3_的极小弯曲半径情况下使用;2、光纤的芯层和内包层掺杂有氟,使得芯层与包层材料的粘度失配问题得到改善,拉丝后光纤内部残余应力减少,可以改善光纤的衰减性能;3、可在光纤器件中使用,增强光纤器件的运行能力。 [0019] Advantageous effects of the present invention is: 1, germanium-doped core contribution amount, effective to convert an optical signal propagating in the core layer constraint, while in the bent state, to effectively prevent the optical signals propagating an outer layer, that the bending resistance of the optical fiber is greatly improved, can achieve a minimum bend radius 3_ in the case where the minimum bend radius; 2, the optical fiber core and inner cladding is doped with fluorine, so that the core material and the cladding viscosity mismatch improved after fiber drawing to reduce the residual internal stress, it can improve the performance of the fiber attenuation; 3, can be used in optical devices, the enhanced operational capabilities of optical devices.

附图说明 BRIEF DESCRIPTION

[0020] 图1是本发明的一个实施例的径向截面示意图。 [0020] FIG. 1 is a radial one embodiment of the present invention is a schematic sectional view.

[0021] 图2是本发明一个实施例的折射率剖面示意图。 [0021] FIG. 2 is a schematic cross-sectional view of the embodiment of the refractive index of embodiment of the present invention.

[0022] 图3是本发明一个实施例光纤折射率剖面图。 [0022] FIG. 3 is a cross-sectional view of the refractive index of an optical fiber embodiment of the present invention.

具体实施方式 Detailed ways

[0023] 下面将给出详细的实施例,对本发明做进一步的说明。 [0023] will be given below in detail of the embodiments, further explanation of the invention.

[0024] 包括有芯层和包层,芯层00由掺锗(Ge)和氟(F)的石英玻璃组成,或由掺锗及其它掺杂剂的石英玻璃组成;围绕在芯层外有两个包层,内包层10紧密围绕芯层,由掺氟或锗氟共掺的石英玻璃组成;外包层20紧密围绕内包层,由纯石英玻璃组成。 [0024] comprising a core and a cladding, the core 00 doped with germanium (Ge) and quartz glass fluorine (F) is composed of silica glass doped with germanium or other dopant and composition; around the outer core layer has two cladding, the inner cladding immediately surrounding the core 10, fluorine-doped germanium-fluorine co-doped or quartz glass; 20 outer layer closely surrounding the inner cladding, made of pure quartz glass.

[0025] 按上述单模光纤的技术方案,在其所规定的范围内对光纤的参数进行设计,并通过我们熟知的PCVD、MCVD, OVD或VAD工艺等芯棒制造工艺根据光纤设计要求制造芯棒,通过套管工艺、OVD工艺等进行外包层的制造,完成整个预制棒的制造。 [0025] According to the above embodiment of the single-mode fiber, they are within a predetermined range of the design parameters of the fiber, and we know through PCVD, MCVD, OVD or VAD core rod manufacturing process or the like according to the process for producing an optical fiber core design requirements bars, produced by the sleeve outer layer process, an OVD process or the like, completing the manufacture of the entire preform.

[0026] 光纤的折射率剖面主要参数如表I所示。 [0026] refractive index profile of the fiber of the main parameters in Table I below.

[0027] 光纤的主要性能参数如表2所示。 [0027] The main performance parameters of the fiber shown in Table 2.

[0028] 宏弯附加损耗测试方法按照IEC60793-1-47中规定的方法,将光纤按一定直径绕成I圈或10圈,然后将圆圈放开,分别测试打圈前后光功率的变化,作为光纤的弯曲附加损耗。 [0028] Additional macro bending loss test method in accordance with the method specified in IEC60793-1-47, the optical fiber is wound into a diameter I by ring or ring 10, then release the circle, were tested before and after the change in optical power circle, as additional bending loss of the fiber. 主要测试光纤在1550nm和1625nm处的弯曲附加损耗,推断光纤在整个波段的弯曲特性。 The main bending test fiber at 1625nm and 1550nm additional loss of fibers throughout the bending characteristics inferred band.

[0029] 从实施例可以看出,(Δ 1- Λ2)对于光纤的弯曲性能有较为明显的影响,更大的(Δ1 - Λ2)值则对应更好的宏弯附加损耗,这是因为高的折射率可以更好的约束光在芯层传输,在受到弯曲等应力作用下,也不容易泄漏到包层中,产生附加损耗。 [0029] As can be seen from the examples, (Δ 1- Λ2) have a more significant effect on the bending performance of the fiber, a larger (Δ1 - Λ2) corresponding to the value of the additional better macrobending losses, because the high the refractive index may be better transmission of light confinement in the core layer, under stress by the bending, it is not likely to leak into the cladding, resulting in additional losses. 而包层的掺氟或锗氟共掺区域,则可以使芯层和包层的材料粘度得到一定的匹配,从而降低拉丝过程中产生的内部应力,从而避免模式泄漏导致的损耗增大。 And the cladding is doped with fluorine or germanium-fluorine co-doped region, it is possible to make the core material and the cladding of a certain viscosity matching, thereby reducing the internal stress generated in the drawing process, thereby avoiding an increase mode due to leakage losses. 然而更多的掺杂氟会导致石英玻璃内部缺陷增大,从而使光纤损耗发生不利影响,而且粘度进一步降低也会使此区域粘度进一步降低,反而不利于拉丝过程中承受拉丝张力,使纤芯部分集中更多的应力,这些都会导致损耗增大。 But more fluorine-doped quartz glass can cause internal defects is increased, so that the adverse effects of fiber loss occurs, but also to further reduce the viscosity of this area will be further reduced viscosity, but is not conducive to withstand the drawing tension during the drawing, so that the core partially centralized more stress, which can lead to increased losses. 因此需要综合考虑掺氟区域的深度和宽度,使材料粘度匹配和材料缺陷降低。 Therefore needs to consider the depth and width of the fluorine-doped regions, the viscosity reducing material matching and material defects.

[0030] 试验表明,按照本发明的技术方案制造的光纤,其1550nm处的模场直径约在6 μ m左右,光缆截止波长在1260nm以下,1550nm处的衰耗在0.3dB/km以下,且光纤具有极好的抗弯曲特性,1550nm波长处,对于围绕3mm弯曲半径饶一圈弯曲附加损耗小于或等于0.1 dB,对于围绕5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.05dB,对于围绕 [0030] The test showed that, according to the aspect of the invention the optical fiber is made, its mode field diameter at 1550nm of about 6 μ m, the cable cutoff wavelength of 1260nm or less, 1550nm attenuation at the 0.3dB / km or less, and the optical fiber has excellent properties of resistance to bending, at a wavelength of 1550 nm, for additional bending Rao circle around 3mm radius bend losses less than or equal to 0.1 dB, for additional bending Rao circle around 5mm bend radius equal to or less than 0.05dB loss, for about

7.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.0ldB,对于围绕IOmm弯曲半径饶一圈弯曲附加损耗小于或等于0.005dB,对于围绕15mm弯曲半径饶十圈弯曲附加损耗小于或等于0.002dB ;在1625nm波长处,对于围绕3mm弯曲半径饶一圈弯曲附加损耗小于或等于 Rao 7.5mm bend radius circle additional bending loss is less than or equal to 0.0ldB, turn for a bending radius RAO additional bending loss is less than or equal to about IOmm 0.005dB, bending radius about 15mm Rao ten turns additional bending loss is less than or equal to 0.002 dB; at a wavelength of 1625nm, for additional bending Rao circle around 3mm radius bend loss is less than or equal to

0.2dB,对于围绕5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.ldB,对于围绕7.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.02dB,对于围绕IOmm弯曲半径饶一圈弯曲附加损耗小于或等于0.005dB,对于围绕15mm弯曲半径饶十圈弯曲附加损耗小于或等于0.005dB。 0.2dB, Rao circle for additional bending loss around a bending radius of 5mm or less 0.ldB, Rao circle for additional bending radius of around 7.5mm bending losses less than or equal to 0.02dB, Rao for a bending radius circle around IOmm additional bending loss less than or equal 0.005dB, for a bending radius of around 15mm Rao ten turns additional bending loss is less than or equal to 0.005dB.

[0031] [0031]

Figure CN102998742BD00061

Claims (9)

1.一种小模场抗弯曲单模光纤,包括芯层和包层,其特征在于所述芯层的相对折射率差Al为0.9%~1.1%,芯层半径Rl为2.4~3.ΟμίΉ;围绕在芯层外有内、外两个包层;内包层相对折射率差Λ2为0%~-0.1%,内包层半径R2为扩12μm;内包层外为外包层;所述的芯层由掺锗的石英玻璃、或锗氟共掺石英玻璃、或锗及其它掺杂剂共掺的石英玻璃组成;所述的内包层由掺氟或锗氟共掺的石英玻璃组成;所述的相对折射率差为各部分相对于纯二氧化硅的折射率差。 A small mode flexural mode optical fiber comprising a core and a cladding, wherein said core relative refractive index difference Al is 0.9% ~ 1.1%, core radius Rl of 2.4 ~ 3.ΟμίΉ ; surrounded with an outer core inner and outer two cladding; an inner cladding relative refractive index difference Λ2 0% to 0.1%, inner cladding radius R2 of 12 m is expanded; outer cladding to the inner cladding layer; the core germanium-doped quartz glass, fluorine or germanium co-doped quartz glass, germanium, and other dopant or co-doped quartz glass; said inner cladding made of quartz glass doped with fluorine or germanium-fluorine co-doped composition; the relative refractive index difference of each portion with respect to a refractive index difference between pure silica.
2.按权利要求1所述的小模场抗弯曲单模光纤,其特征在于所述的芯层由芯层中锗的贡献量AGe为0.9%~1.1%,氟(F)的贡献量Λ F等于或低于-0.1 %。 2. Anti small mode according to claim 1 bent single mode optical fiber, wherein the core layer from the core layer of germanium AGe contribution of 0.9% to 1.1% fluorine (F) of the contribution of Λ F is equal to or less than 0.1%.
3.按权利要求1或2所述的小模场抗弯曲单模光纤,其特征在于所述的内包层半径R2与芯层半径Rl的比值R2/R1为4-4.5,内包层相对折射率差Λ 2与芯层相对折射率差Λ I的差值(Λ 1-Δ 2)为L 0%至L 16%。 3. Anti small mode according to claim 1 or 2 single mode optical fiber is bent, wherein a ratio of the radius R2 of the inner cladding and the core radius Rl R2 / R1 4-4.5, the inner cladding relative refractive index difference Λ 2 and Λ I core relative refractive index difference of the difference (Λ 1-Δ 2) to L 0% to L 16%.
4.按权利要求1或2所述的小模场抗弯曲单模光纤,其特征在于所述的外包层由纯石英玻璃组成。 4. Anti small mode according to claim 1 or 2 single mode optical fiber is bent, characterized in that said outer layer is made of pure quartz glass.
5.按权利要求1或2所述的小模场抗弯曲单模光纤,其特征在于所述的单模光纤在1310nm波长处的衰减系数小于或等于0.52dB/km ;在1310nm波长处的模场直径为.4.5~5.5 μ m0 The anti small mode according to claim 1 or 2 single mode optical fiber is bent, characterized in that said single mode optical fiber is equal to or less than 0.52dB / km in the attenuation coefficient at a wavelength of 1310nm; mode at a wavelength of 1310nm field diameter .4.5 ~ 5.5 μ m0
6.按权利要求1或2所述的小模场抗弯曲单模光纤,其特征在于所述的单模光纤在.1550nm波长处的衰减系数小于或等于0.30dB/km ;在1550nm波长处的模场直径为5.5um至.6.5 μ m0 6. small mode bend resistant single-mode fiber according to claim 1 or 2, wherein said single mode optical fiber is equal to or less than 0.30dB / km in the attenuation coefficient at a wavelength of .1550nm; at a wavelength of 1550nm mode field diameter of 5.5um to .6.5 μ m0
7.按权利要求1或2所述的小模场抗弯曲单模光纤,其特征在于所述的单模光纤具有小于或等于1260nm的光缆截止波长。 7. Anti small mode according to claim 1 or 2 single mode optical fiber is bent, characterized in that said single mode optical fiber has a cable cutoff wavelength less than or equal to 1260nm.
8.按权利要求1或2所述的小模场抗弯曲单模光纤,其特征在于所述的单模光纤在.1550nm波长处,对于围绕3mm弯曲半径饶一圈弯曲附加损耗小于或等于0.1dB,对于围绕.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.05dB,对于围绕7.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.01dB,对于围绕IOmm弯曲半径饶一圈弯曲附加损耗小于或等于.0.005dB,对于围绕15mm弯曲半径饶十圈弯曲附加损耗小于或等于0.002dB。 8. The anti small mode according to claim 1 or 2 single mode optical fiber is bent, characterized in that said single mode optical fiber at the wavelength .1550nm, Rao circle for additional bending loss is less than about 3mm, or a bending radius equal to 0.1 dB, for additional bending about .5mm Rao circle radius bending losses less than or equal to 0.05dB, for a bending radius of around 7.5mm Rao circle additional bending loss is equal to or less than 0.01dB, Rao for a bending radius circle around IOmm additional bending loss is less than or equal .0.005dB, for a bending radius of around 15mm Rao ten turns additional bending loss is less than or equal to 0.002 dB.
9.按权利要求1或2所述的小模场抗弯曲单模光纤,其特征在于所述的单模光纤在.1625nm波长处,对于围绕3mm弯曲半径饶一圈弯曲附加损耗小于或等于0.2dB,对于围绕.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.1dB,对于围绕7.5mm弯曲半径饶一圈弯曲附加损耗小于或等于0.02dB,对于围绕IOmm弯曲半径饶一圈弯曲附加损耗小于或等于.0.005dB,对于围绕15mm弯曲半径饶十圈弯曲附加损耗小于或等于0.005dB。 9. The anti small mode according to claim 1 or 2 single mode optical fiber is bent, characterized in that said single mode optical fiber at the wavelength .1625nm, Rao circle for additional bending radius bending losses less than around 3mm or equal to 0.2 dB, for additional bending about .5mm Rao circle radius bending losses less than or equal to 0.1dB, for a bending radius of around 7.5mm Rao circle additional bending loss is equal to or less than 0.02dB, Rao for a bending radius circle around IOmm additional bending loss is less than or equal .0.005dB, for a bending radius of around 15mm Rao ten turns additional bending loss is less than or equal to 0.005dB.
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