Optical communication system having an operating wavelength `lambda` metre can use only x % of its source frequency as its channel band width. The system is to be used for transmitting T.V signals requiring a band width of F hertz. How many channels can this system transmit simultaneously? Show graphically how this number of channels varies with operating wavelength of the system.

Options

A. `lambdaF//Cx`
B. `2_(Cx)//100lambdaF`
C. ` cx//50lambdaF`
D. `cx//100lambdaF`

Answer

D

Explanation

Optical s ource frequency `=(c)/(lambda)Hz`
Bandwidth of channel `=x% "of" (c)/(lambda)=(cx)/(100lambda)`
Number of channels.
`n=("Total bandwidth of channel")/("Bandwidth needed per channel")=(cx//100A)/(F)=(cx)/(100lambdaF)`