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Wavelength Division Multiplexing
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1)How many spectral bands are there in optical fiber communication? 
  

2)What is the spectrum range for ultra long band i.e U-band? 
  

3)If a spectrum of signal ranges from its lowest frequency f (low) = 10kHz to its highest frequency f(high)= 100kHz, then the bandwidth B is 
  

4)What band is used for shorter wavelength multimode fiber system? 
  

5)If for a wavelength 1300nm, InGaAs has coupling efficiency ηof 90%, tyhen responsivity is 
  


  


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