Suppose we have a system consi

timer Asked: Nov 30th, 2015

Question description

Suppose we have a system consisting of an LED emitting 10mW at 0.85 micro meters, a fiber cable with  20dB loss, and a PIN photodetector of responsitivity of 0.5A/W. The detector dark current is 2nA. The load resistance is 50 Ώ, the receiver’s bandwidth is 10MHz, and its temperature is 300K( 27 degree Celsius). The system losses, in addition to the fiber attenuation, include a 14dB power reduction due to source coupling and a 10dB loss caused by various splices and connectors. Determine:  a/ the received optic power.  b/ the detected signal current  c/ the electrical signal power  d/ the shot noise and thermal noise powers, e/ the signal to noise ratio 

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