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[单选题]
为实现光的远距离传输,光纤纤芯折射率N1与包层折射率N2应满足的关系为:()。
A.N1>N2
B.N1=N2
C.N1
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.N1>N2
B.N1=N2
C.N1
阶跃光纤纤芯径2a=50μm,△=0.01,n1=1.45,当λ=0.8μm时,其归一化频率V和光纤中能传输的模数分别为多少?
A.n1>n2,α大于某一值
B.n1<n2,α大于某一值
C.n1>n2,α小于某一值
D.n1<n2,α小于某一值
A.光缆类型
B.光缆长度
C.光缆线路损耗
D.光缆粗细
A.
B.
C.
D.