E&M Fiber Amplifiers

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Homework Statement



One of the most exciting developments in lightwave engineering is the Erbidium doped fiber amplifier (ERDF A). It is very quiet(low noise) has a bandwidth of hundreds of GHz and relatively low cost.The fiber is "pumped" by a semiconductor laser operating at 850nm and the light carrying the information at 1550nm is amplified. The 'attenuation'
constant is given as u=-0.046m^-1. If I have 0.01mW entering the ERDFA
and I would like to get 100mW out, how long should be my fiber amplifier?
If the efficiency of the amplifier is 20% how much pumping power do I
need?


Homework Equations



Loss Equation e^(-2*α(z1-z0)

alpha is attenuation constant

if the negative sign was removed. would this be a gain equation?


The Attempt at a Solution



I do not know where to start, the teacher said the wavelengths were irreverent.
 

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