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    • #49459
      AJAYBEER KAUR
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      Sir on which basis Bandwidth of rectangular optical filter is decided. If frequency is 1550 nm then how BW is 2 nm.

    • #49496

      You can convert to bandwidth in hertz as follow:
      Delta_f = ((speed of light)/wavelength^2) * Delta_wavelength.

      for your data up in free space, then
      Delta_f = ( (3*10^8) / ((1550*10^-9)^2) ) * 2*10^-9;
      for fiber communication, do not forget to divided by refractive index of fiber ( such as 1.5 for silicon)

      thanks,
      Mohamed Abouseif

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