CN1550802A - 超大有效面积光纤以及包含这种光纤的通信系统 - Google Patents
超大有效面积光纤以及包含这种光纤的通信系统 Download PDFInfo
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Abstract
提供一种超大有效面积(SLA)的光纤(10),该光纤适于在较宽的波长范围进行通信,并且,由于具有较大的有效面积,可以抑制通常会由信道之间的交互作用引起的非线性效应。本发明的SLA光纤(10)的有效面积Aeff优选在1310nm附近的波长窗口处等于或大于约80μm2。因此,本发明的SLA光纤(10)具有非常大的有效面积和非常低的截止波长。根据本发明,提供各种具有非常大的有效面积和所需的传输性能的SLA光纤。本发明的SLA光纤的大的有效面积使非线性效应以及模拟传输中的受激布里渊散射受到抑制。大的有效面积还降低了衰减。抑制非线性效应和降低衰减可以使得信号在较远的距离和在较宽的带宽上传输。
Description
技术领域
本发明涉及光纤。更具体地,本发明涉及具有低损耗且具有宽的工作波长范围的超大有效面积(SLA)光纤。
背景技术
光纤是可以远距离且以相对较低的衰减传输包含相对较大量的信息的光信号的玻璃或塑料细线。一般而言,光纤通过这样一种方法制成,即,加热并拉拔包含折射纤芯区的光预制棒的一部分,该折射纤芯区被由玻璃或其它适当的材料制成的保护包层区环绕。通常还用施加在包层区上的一层或多层涂层保护由预制棒拉拔出来的光纤。
利用光纤进行的传输技术的进展已使得光纤可以具有极大的带宽容量。这种带宽使得可以在细如毛发的纤维上同时传输几千个电话会话和几百个电视频道。在波分复用(WDM)系统中增加了光纤的传输容量,其中,在单根光纤上复用若干个信道,而各个信道在不同的波长下进行工作。但是,在WDM系统中,出现信道之间的非线性交互作用,诸如严重降低了系统容量的4光子混合。美国专利No.5327516(′516专利)已大致解决了这个问题。′516专利公开了通过在工作波长下引入少量的色散而降低这些非线性交互作用的光纤。
随着用单根光纤传输的WDM信道的数量增加,由光纤承载的光功率也增加。随着光功率增加,由信道之间的交互作用产生的非线性效应也增加。因此,为了降低信道之间的非线性交互作用,特别是考虑到日益增长的带宽需求,光纤最好是向各WDM信道提供少量的色散。但是,为了可以在传输链路后恢复信号,很重要的是,在不同WDM信道间引入的色散变化要尽可能少。
在用于制作光纤的材质方面已取得重要进展。在1970年,玻璃光纤的可接受的损耗在20分贝/千米(dB/km)的范围内,但现在损耗一般为约0.25dB/km。玻璃光纤在理论上的最小损耗小于0.15dB/km,它出现在约1550纳米(nm)的波长上。由于玻璃光纤中的光速是光的传输波长的函数,所以对于包含一定范围的波长的脉冲,玻璃光纤中的色散导致脉冲扩展。脉冲加宽是光纤色散、光纤长度和光源的光谱宽度的函数。通常用纵轴为色散(单位为皮秒(ps)/纳米(nm)),或ps/nm-km(千米),横轴为波长的图(未示出)表示各光纤的色散。可以同时有正色散和负色散,因此纵轴的范围为诸如-250到+25ps/nm km。在横轴上色散等于零时的波长对应于光纤最高的带宽。但是,该波长一般不与光纤以最小衰减传输光时的波长一致。
例如,典型的第一代单模光纤通常在1550nm下传输时衰减最小,而同一光纤的色散在1310nm时接近于零。并且,玻璃光纤的上述理论最小损耗发生在传输波长为约1550nm时。掺杂铒的放大器是目前应用最普遍的用于放大光纤上传载的光信号的光学放大器,由于它在1530-1565nm的范围内工作,所以正常使用的传输波长为1550nm。由于这种光纤的色散一般在1310nm的波长上而非在1550nm的最佳传输波长上最接近零,因此,为了提供最佳整体系统性能(即,低的光损耗和低色散),人们正在不懈努力以提高传输路径上的色散补偿。
为了提高光谱效率并降低波分复用和密集型波分复用(WDM/DWDM)光传输系统的误码率,最好抑制上述非线性光学效应并降低较宽的带宽上的衰减。已开发了超大有效面积(SLA)光纤以满足这种需要。SLA光纤一般被用作传输光纤且一般同时具有正色散和正色散斜率。这些光纤的大有效面积抑制非线性效应,使得在较宽的波长范围内提高传输性能。但是,目前制作的大多数SLA光纤在接近1450nm处具有截止波长,这具有两个缺点。首先,该截止波长使得在~1300nm波长窗口内的单模工作变得不可能,对于单模光纤,在该波长窗口中色散最小。在城域网络中,在1310nm的SONET/SPH传输还非常广泛。另外,通过降低SLA光纤中受激布里渊散射(SBS)的阈值,可以对在1550nm的较远距离(例如大于20km)的光缆电视传输有利。但是,当前SLA光纤的较高的截止波长将会阻碍1310nm业务在同一光纤路径上的应用,使得该光纤路径灵活性更小,从而被配置的可能性更小。最后,1450nm的截止波长对于S和C波段中的信号的拉曼脉动(Raman pumping)不是优选的。
最好提供这样的SLA光纤,即该SLA光纤与现有SLA光纤相比具有较低的截止波长,且与现有SLA光纤的有关传输性能相比具有相同或更高的传输性能,包括诸如在较宽波长范围上具有较低非线性光学效应和较低的衰减。
发明内容
本发明提供这样一种超大有效面积光纤,它适于在宽波长范围工作,并且,由于它具有较大的有效面积,因此它可以抑制所有类型的非线性效应。在1310nm附近的波长窗口处,本发明的SLA光纤的有效面积Aeff优选地等于或大于约80μm2。因此,本发明的SLA光纤具有非常大的有效面积和较适于1310nm工作的较低的截止波长。根据本发明,提供具有非常大的有效面积和所需的传输性能的各种SLA光纤。本发明的SLA光纤的较大有效面积可以抑制非线性效应。虽然SLA光纤的有效面积非常大,但这些SLA光纤提供强大的光能导引能力和非常优异的对于微弯曲和宏弯曲损耗效应的抵抗能力。抑制非线性效应的结果可以使得信号在较远的距离范围内以较宽的带宽进行传输。通过降低作为模拟光波系统中最普遍的非线性效应的受激布里渊散射(SBS)的阈值,也可以有利于光缆TV系统。SBS阈值限制了放大的CATV传输中在1550nm下的发射功率,限制了放大器之间的距离,对系统的成本产生负面影响。
优选地,SLA光纤包含至少分段为具有正的相对折射率n1a和n1b的第一和第二部分的纤芯区、具有负的相对折射率n2且环绕纤芯区的第一环形区(即,沟槽区)和相对折射率n0为0.0%且环绕第一环形区的包层区。这里所用的术语“分段”用来表示纤芯至少具有两个相对折射率不同的区域。
这里所用的术语“相对折射率”指光纤中除包层区以外的区域的折射率值是相对于包层区的折射率而给出的。这就是为什么认为包层区的相对折射率为0.0%。将纤芯区分段,使得纤芯区的相对折射率在纤芯区的第一部分的边缘与纤芯区的第二部分的边缘一致的位置为最大。纤芯区中与最大相对折射率相对应的位置最好沿径向偏离纤芯区的中心。用这种方式将纤芯区分段(即,使得最大相对折射率出现在纤芯中沿径向偏离纤芯中心的位置),可以使得光纤具有超大有效面积,同时具有非常低的截止波长。并且,在获得这些传输性能时不会导致任何宏弯曲损耗或衰减的增加。
根据另一实施例,本发明的SLA光纤包含未被分段的纤芯。但是,可以将沟槽区分为具有不同相对折射率的第一和第二沟槽部分。
通过以下的说明、附图和权利要求,本发明的这些和其它特征和优点将变得更加明显。
附图说明
图1是根据本发明一个实施例的超大有效面积(SLA)光纤的端面剖面图。
图2-8表示根据本发明的各个实施例的SLA光纤的各种相对折射率分布。
具体实施方式
图1是根据本发明的一个实施例的超大有效面积(SLA)光纤10的端面剖面图。SLA光纤10包含分段的中心纤芯区11、环绕纤芯区11的第一环形区13和环绕沟槽区的外包层14。纤芯区11分段为分别具有不同相对折射率n1a和n1b的第一和第二部分纤芯区部分12A和12B。第一环形区(或沟槽区)13具有标称折射率n2。外包层14具有标称折射率n3。如下面参照图7所详细讨论的那样,根据本发明的SLA光纤还可以具有其它的区,诸如除沟槽区13之外的另一负相对折射率区。
应当注意,图1中所示的光纤10未按比例给出(包层14的外径优选为约125μm,而纤芯区11的直径优选为约7-10μm)。对于光纤10的各区的尺寸,本发明不限于任何特定尺寸。并且,如下详述,由于不同区域的相对折射率的值,以及由于它们的功能,以下,将第一环形区13称为“沟槽”区,而将区域14称为外包层。
还应当注意,虽然图1中所示的各圆环暗示区域11-14的折射率之间的变化是突变的,可能是这种情况,但不是必需的。圆环使得可以很容易地区分各个区域,这有助于对本发明进行说明。
下面参照图2-7说明提供本发明的各种SLA的各种折射率分布。如下面所述,与这些分布的每一个相关的SLA都具有大的有效面积和所需的传输性能。应当注意,这些折射率分布和相关的SLA仅是实例,本发明并不仅限于这些实例。提供这些实例是为了说明具有分段为两个或两个以上的折射率不同的部分的纤芯的SLA光纤可以具有超大有效面积和所需的传输性能,诸如低的截止波长、低的宏弯曲损耗、低的微弯曲损耗和低的衰减。当然,传输性能随分布而改变,并且根据所需的传输性能选择分布。例如,一个分布与另一个分布相比可以提供较大有效面积和较低的截止波长,但可能具有较大的宏弯曲损耗和/或衰减,反之亦然。
图2是根据本发明的一个实施例的SLA光纤的折射率分布20的图解表示,例如,该SLA光纤如图1所示。Y轴对应于以百分比表示的相对折射率,X轴对应于以微米表示的从光纤10的纤芯11的中心沿半径向光纤10的包层14的外边缘延伸的位置。图2中所示的折射率值为相对折射率值,即,它们是相对于外包层14的折射率。因此,应将图2中给出的折射率值看作特定区域的折射率值与外包层14的折射率值之间的差除以外包层14的折射率值。换句话说,给定区域的相对折射率值由公式(nregion-ncladding)/ncladding给出,其中,nregion对应于特定区域的折射率,ncladding对应于包层的折射率。因此,当这里讨论光纤10的各个区域的折射率时,应当理解实际上是用相对折射率对它们进行讨论。
SLA光纤10包含掺杂锗的石英(SiO2)纤芯11(例如,掺杂了适当量的GeO2的SiO2)、环绕纤芯区11的掺杂氟(F)和/或锗(Ge)的沟槽区13(例如,掺杂了适当量的GeO2和F的SiO2)、和环绕沟槽区13的纯石英外包层14。优选地,纤芯区11的部分12A和12B掺杂不同量的锗,以使得这些区域相对于X方向的位置分别具有不同的正的折射率值n1a和n1b。对沟槽区13的掺杂使沟槽区13具有负的相对折射率。图2所示的对应于纤芯区12A和12B的折射率分布的各个部分由下列公式确定:
其中,r为半径位置,单位为微米,nmax是纤芯区11的最大相对折射率,a1是纤芯区的第一部分的半径,a2是纤芯区的第二部分的厚度,n1a是分段纤芯区的第一部分的相对折射率,n1b是分段纤芯区的第二部分的相对折射率,a1+a2是纤芯区的半径r,a3是沟槽区的宽度,a1+a2+a3是向外到达与外包层14的开端邻近的沟槽区13的外边缘的半径。
沟槽区的半径由式子a1+a2≤r≤a1+a2+a3给出。应注意,虽然图2中仅给出外包层14的半径为30μm,但这只是由于图面所限。虽然本发明不把包层限于任何具体半径尺寸,但外包层14的半径一般远大于所示出的尺寸(例如,125μm)。事实上,可能希望更大的包层尺寸。
项a1≥1是规定纤芯区11的形状的幂数。优选地,0≤a1≤2.65,7.1≤a1+a2≤10,和3≤a3≤25,这里,所有值的单位均为微米。优选地,0.25%≤nmax≤0.42%。优选-0.4%≤n2≤0.075%,这里n2是沟槽区13的相对折射率。这里将把包层区的折射率视为n0,其中,n0是0.0%。图2中所示的相对折射率分布20反映了这些值和范围。分段纤芯区的最大相对折射率对应于分布20的点21。最大值点21不位于Y轴上说明了最大值点21偏离了纤芯区11的中心。分别具有上升斜坡和下降斜坡的线22和23使纤芯区11的分布呈现有些三角形状。虽然将纤芯区11分段,但与纤芯区11的部分12A和12B对应的分布20的各部分不必是线性的。例如,与纤芯11对应的分布的该部分可以为抛物线形和椭圆形等。并且,例如,与分段纤芯区的一个部分对应的分布的部分可以为线性的,而与纤芯区的另一部分对应的分布的部分可以为非线性的。
在图2中,由数字标记24表示分布20中对应于沟槽区13的部分。在图2中,由标记25表示分布20中对应于外包层14的部分。图2中所示的分布20对应的传输性能如下:
1)有效面积Aeff(1550nm)≥95μm2;Aeff(1310nm)≥80μm2;
2)光缆截止波长≤1310nm;
3)宏弯曲损耗:直径心轴为20mm时小于10dB/m;
4)衰减损耗:在1550nm时小于0.19dB/km;在1310nm时小于0.35dB/km;以及
5)色散(D):在1550nm时D为约20ps/km/nm;
6)色散对色散斜率的比值(RDS):在1550nm时RDS为约0.0031nm-1。
图3是根据本发明的另一实施例的SLA光纤的相对折射率分布30。该SLA光纤的传输性能如下:
1)有效面积Aeff(1550nm)≈113.9μm2;Aeff(1310nm)≈100.3μm2;
2)光缆截止波长≤1300nm;
3)宏弯曲损耗:直径心轴为20mm时小于10dB/m;
4)D(1550nm):20.55ps/km/nm
5)色散斜率(S)(1550nm):0.064ps/km/nm2;
6)衰减损耗:在1550nm时小于0.19dB/km;在1310nm时小于0.35dB/km。
SLA光纤的分段纤芯的第一部分对应于线31。SLA光纤的分段纤芯的第二部分对应于线32。最大相对折射率对应于点33。从折射率最大值点33的位置可以看出,最大值点33沿径向偏离纤芯区的中心,这是优选的。并且,图3的分布30的最大值点33稍稍大于图2中所示的分布20的最大值点21。SLA的沟槽区对应于分布30中由标记34表示的部分。由标记35表示分布30中对应于SLA光纤的外包层的部分。
从分布30和上面所列的传输性能可以看出,根据本发明的本实施例的SLA光纤也具有非常低的截止波长,同时,还具有非常大的有效面积。并且,由分布30表示的光纤具有非常低的宏弯曲损耗和低的衰减损耗。
图4是根据本发明的另一实施例的SLA光纤的相对折射率分布40。该SLA光纤的传输性能如下:
1)有效面积Aeff(1550nm)≈107.3μm2;Aeff(1310nm)≈93.7μm2;
2)光缆截止波长≤1300nm;
3)宏弯曲损耗:直径心轴为20mm时小于10dB/m;
4)D(1550nm):20.49ps/km/nm
5)S(1550nm):0.064ps/km/nm2;
6)衰减损耗:在1550nm时小于0.19dB/km,在1310nm时小于0.35dB/km;
SLA光纤的分段纤芯的第一部分对应于线41。SLA光纤的分段纤芯的第二部分对应于线42。最大相对折射率对应于点43。从折射率最大值点43的位置可以看出,最大值点沿径向偏离纤芯区的中心。除了分布40的最大值点43明显大于分布30的最大值点33外,图4的分布40与图3的分布30非常相似。同样地,图4中所示的分布40的最大值点43明显大于图2中所示的分布20的最大值点21。
由标记44表示分布40的沟槽区。由标记45表示分布40中对应于SLA光纤的外包层的部分。从分布40和上面所列的传输性能可以看出,根据本发明的本实施例的SLA光纤也具有非常低的截止波长,同时,也具有非常大的有效面积。并且,由分布40表示的光纤具有非常低的宏弯曲损耗和较低的衰减损耗。
图5是根据本发明的另一实施例的SLA光纤的相对折射率分布50。该SLA光纤的传输性能如下:
1)有效面积Aeff(1550nm)≈122.9μm2;Aeff(1310nm)≈102.1μm2;
2)光缆截止波长≤1320nm;
3)宏弯曲损耗:直径心轴为20mm时小于10dB/m;
4)D(1550nm):19.60ps/km/nm
5)S(1550nm):0.063ps/km/nm2;
6)衰减损耗:在1550nm时小于0.19dB/km,在1310nm时小于0.35dB/km;
最大折射率53处于Y轴上,这意味着在纤芯中出现最大值的点基本上没有偏离纤芯的中心。如其它实例那样,将纤芯分段为具有不同相对折射率的两个部分。分布50的部分52的抛物线形状意味着限定纤芯的分布形状的幂数α大于2。与图2~4中所示的分布的沟槽区部分相比,分布的沟槽区部分54相对较窄。用标记55表示分布中对应于包层区的部分。
图6是根据本发明的另一实施例的SLA光纤的相对折射率分布60。该SLA光纤的传输性能如下:
1)有效面积Aeff(1550nm)≈131.2μm2;Aeff(1310nm)≈112.4μm2;
2)光缆截止波长≤1340nm;
3)宏弯曲损耗:直径心轴为20mm时小于10dB/m;
4)D(1550nm):20.08ps/km/nm
5)S(1550nm):0.064ps/km/nm2;
6)衰减损耗:在1550nm时小于0.19dB/km,在1310nm时小于0.35dB/km;
除了如线61所示最大相对折射率点63偏离纤芯的中心轴之外,分布60与图5的分布50非常相似。SLA光纤的沟槽区对应于分布60中由标记64表示的部分。如图5的分布50那样,沟槽区的相对折射率大于对应于图2~4的分布的沟槽区的相对折射率。由标记65表示分布60中对应于SLA光纤的外包层的部分。
图7是根据本发明的另一实施例的SLA光纤的相对折射率分布70。该SLA光纤的传输性能为:
1)有效面积Aeff(1550nm)≈106.4μm2;Aeff(1310nm)≈92.5μm2;
2)光缆截止波长≤1300nm;
3)宏弯曲损耗:直径心轴为20mm时小于10dB/m;
4)D(1550nm):20.64ps/km/nm
5)S(1550nm):0.063ps/km/nm2;
6)衰减损耗:在1550nm时小于0.19dB/km;在1310nm时小于0.35dB/km;
SLA光纤的分段纤芯的第一部分对应于线71。SLA光纤的分段纤芯的第二部分对应于线72。最大相对折射率对应于点73。从折射率最大值点73的位置可以看出,最大值点沿径向偏离纤芯区的中心。SLA光纤的沟槽区对应于分布中由标记74表示的部分。将该分布70与图2-6的实例分布相比较,可以看出,分布中对应于沟槽区的部分74相对较深(即,与图2-6的实例相比其相对折射率较低),并且也相对较窄。在沟槽区后面,相对折射率在分布中由标记76表示的部分上变为0.0%,然后在分布中由标记77表示的部分上变为负值。因此,与图2~6所示的分布不同,图7中所示的分布70具有两个凹陷的区域,即,由分布部分74表示的沟槽区和由分布部分77表示的第二区,该分布部分77具有大于沟槽区的相对折射率的负的相对折射率。分布中由标记78表示的部分对应于包层区。
从以上所列的具有分布70的SLA的传输性能可以看出,根据本发明的本实例的SLA光纤也具有极低的截止波长,同时具有非常大的有效面积。
图8是根据本发明的另一实施例的SLA光纤的相对折射率分布80。与使用上述实施例的光纤一样,该SLA光纤的传输性能也满足需要。例如,光纤的有效面积Aeff(1550nm)≈110μm2,光缆截止波长≤1270nm,宏弯曲损耗在直径心轴为32mm时小于0.810dB/m。色散为D(1550nm):18.57ps/km/nm。色散斜率为S(1550nm):0.061ps/km/nm2。根据该实施例的SLA光纤的相对色散斜率(RDS)为0.0033nm-1。
没有将根据本实施例的SLA光纤的纤芯分段,该纤芯具有基本恒定的相对折射率。分布80中对应于纤芯的部分由标记线81表示。最大相对折射率为约0.25%。SLA光纤的沟槽区具有分别由标记82和83表示的第一和第二部分。沟槽区的第一部分82从约6μm延伸到约18μm。沟槽区的第二部分83从约18μm延伸到约33μm。沟槽区83厚度为33μm仅是一个例子,它可在约30μm到约45μm的范围内。在本例子中,分布中对应于包层区的部分从约33μm延伸到约62.5μm。
从以上所列的具有分布80的SLA的传输性能可以看出,根据本发明的本实例的SLA光纤也具有极低的截止波长,同时具有非常大的有效面积和低的光损耗特性。
从以上提供的实例可以看出,本发明的SLA具有超大有效面积和所需的传输性能,诸如相对较低的截止波长。并且,根据本发明的SLA还具有与现有SLA光纤相比相当或更优的其它所需的传输性能,诸如低的宏弯曲损耗、低的微弯曲损耗和低的衰减。
本领域中的技术人员可以理解,在不偏离本发明的范围的情况下,可以对这里所述的光纤的实施例进行多种变化和替换。这些变化和替换包含但不限于下列方面:使用不同的掺杂材料以实现相同或不同的分布形状、在制作光纤时使用塑料材料(而非玻璃)。且如上所述,本发明不限于以上参照图2-8所讨论的分布和传输性能。本领域中的技术人员可以理解,基于本公开内容,除了上述分布和传输性能外,还可以使用本发明的构思和原理获得其它分布和其它相关的传输性能,以提供根据本发明的SLA光纤。
Claims (10)
1.一种光纤通信系统,包括:
至少一个光能源;
包括具有正色散和正色散斜率的光纤(10)的光缆,该光缆与所述至少一个光能源耦合,光纤(10)具有纤芯区(11)和环绕纤芯区的包层区(14),在波长为约1310nm时具有等于或大于约80平方微米(μm2)的有效面积Aeff,并具有小于或等于约1310nm的光缆截止波长,
其中,纤芯区(11)被至少分段为第一(12A)和第二(12B)折射率部分,该第一和第二折射率部分(12A,12B)分别具有彼此不同的第一和第二相对折射率n1a和n1b,并且所述第一和第二相对折射率为正值。
2.根据权利要求1的光纤通信系统,其特征在于,光纤(10)在波长为约1550nm时具有等于或大于约95μm2的有效面积Aeff。
3.根据权利要求1的光纤通信系统,其特征在于,光纤(10)还包括位于纤芯区(11)和包层区(14)之间的沟槽区(13),该沟槽区(13)具有负的相对折射率n2。
4.根据权利要求3的光纤通信系统,其特征在于,具有第一和第二折射率部分(12A,12B)的纤芯区(11)具有由下式确定的相对折射率分布:
其中r为半径位置,单位为微米,nmax是纤芯区的最大相对折射率,a1是纤芯区的第一部分(12A)的半径,a2是纤芯区(11)的第二部分(12B)的厚度,n1a是分段纤芯区(11)的第一部分(12A)的相对折射率,n1b是分段纤芯区(11)的第二部分(12B)的相对折射率,a1+a2是纤芯区的半径,a3是沟槽区的宽度,a1+a2+a3是向外到达与包层区(14)的开端邻近的沟槽区(13)的外边缘的半径。
5.根据权利要求4的光纤通信系统,其特征在于,α1≥1是规定纤芯区(11)的折射率分布的形状的幂数。
6.根据权利要求4的光纤通信系统,其特征在于,近似地,0≤a1≤2.65,7.1≤a1+a2≤10,且3≤a3≤25,其中a1、a2和a3的单位是微米。
7.一种超大有效面积SLA光纤(10),该SLA光纤(10)具有正色散和正色散斜率,在波长为约1310nm时具有等于或大于约80μm2的有效面积Aeff,并具有小于或等于约1310nm的光缆截止波长,该光纤(10)具有纤芯区(11)和环绕纤芯区(11)的包层区(14),
其中,纤芯区(11)至少被分段为第一和第二折射率部分(12A,12B),该第一和第二折射率部分(12A,12B)分别具有彼此不同的第一和第二相对折射率n1a和n1b,并且所述第一和第二相对折射率为正值。
8.根据权利要求7的光纤(10),其特征在于,光纤(10)在波长为约1550nm时具有等于或大于约95平方微米(μm2)的有效面积Aeff。
9.根据权利要8的光纤(10),其特征在于,光纤(10)还包括位于纤芯区(11)和包层区(14)之间的沟槽区(13),该沟槽区(13)具有负的相对折射率n2。
10.根据权利要9的光纤(10),其特征在于,具有第一和第二折射率部分(12A,12B)的纤芯区(11)具有由下式确定的相对折射率分布:
其中r为半径位置,单位为微米,nmax是纤芯区(11)的最大相对折射率,a1是纤芯区(11)的第一部分(12A)的半径,a2是纤芯区(11)的第二部分(12B)的厚度,n1a是分段纤芯区(11)的第一部分(12A)的相对折射率,n1b是分段纤芯区(11)的第二部分(12B)的相对折射率,a1+a2是纤芯区(11)的半径,a3是沟槽区(13)的宽度,a1+a2+a3是向外到达与包层区(14)的开端邻近的沟槽区(13)的外边缘的半径。
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US10/435,855 | 2003-05-12 |
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Also Published As
Publication number | Publication date |
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EP1477831B1 (en) | 2005-12-28 |
US6904218B2 (en) | 2005-06-07 |
JP2004341525A (ja) | 2004-12-02 |
EP1477831A1 (en) | 2004-11-17 |
CN1278150C (zh) | 2006-10-04 |
DE602004000279T2 (de) | 2006-07-20 |
DE602004000279D1 (de) | 2006-02-02 |
JP4163656B2 (ja) | 2008-10-08 |
US20040228593A1 (en) | 2004-11-18 |
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