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Estimate the fastest bit rate capable of being carried by light of wavelength `1.3 mu m`. How many phone calls could be carried at this bit rate ? Band width of optical fibre = 2 GHz.A. `2.9xx10^(7)`B. `1.5xx10^(6)`C. `2.3xx10^(5)`D. `1.7xx10^(4)` |
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Answer» Correct Answer - C Here, `lambda=1.3xx10^(-6)Hz` `v=(c)/(lambda)=(3xx10^(9))/(1.3xx10^(-6))=2.3xx10^(14)Hz` Max bit rate `=2U=2xx2.3xx10^(14)=4.6xx10^(14)Hz` For optical fibre, band width =2GHz=`2xx10^(2)Hz` `therefore` No. of phone calls `=(4.6xx10^(14))/(2xx10^(4))=2.3xx10^(3)` |
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