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JCECE Engineering JCECE Engineering Solved Paper-2012

  • question_answer
    An optical fibre communication system works on a wavelength of\[1.3\mu m\]. The number of subscribers it can feed if a channel requires \[20\,\,kHz\] are

    A) \[1\times {{10}^{5}}\]                   

    B) \[2.3\times {{10}^{10}}\]

    C)  \[1.15\times {{10}^{10}}\]                          

    D)  None of these

    Correct Answer: C

    Solution :

    Optical source' frequency,                 \[f=\frac{c}{\lambda }=\frac{3\times {{10}^{8}}}{1.3\times {{10}^{-6}}}\] \[\therefore \]Number of channels or subscribers                 \[=\frac{2.3\times {{10}^{14}}}{20\times {{10}^{3}}}=1.15\times {{10}^{10}}\]


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