光纤通信计算题 英文题 但计算简便.1、consider a fiber with a 25um core radius,core index n1=1.48,and the core cladding index difference Δ=0.01,if ƒ=1320nm,what are the numerical aperture NA,the value of normalized frequency V and

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光纤通信计算题 英文题 但计算简便.
1、consider a fiber with a 25um core radius,core index n1=1.48,and the core cladding index difference Δ=0.01,if ƒ=1320nm,what are the numerical aperture NA,the value of normalized frequency V and how many modes propagation in the fiber?
please explain the calculating results.

.建议你去看一本光纤通信方面的书.
题目的意思是:光纤的纤芯折射率1.48,包层折射率与之相差0.01,问你数值孔径是多少?归一化截止频率是多少?有几个模式可以传播?