1.

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.

Answer»

`2.9xx10^(7)`
`1.5xx10^(6)`
`2.3xx10^(5)`
`1.7xx10^(4)`

Solution :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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