Consider a thermal-noise-limited analog optical fiber system that uses a pin photodiode with a...

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Consider a thermal-noise-limited analog optical fiber system that uses a pin photodiode with a responsivity of 0.85 at 1310 nm. Assume the system uses a modulation index of 0.5 and operates in a 5-MHz bandwidth. Let the mean-square thermal noise current for the receiver be 2 x 10r23 A2/Hz. What is the peak-to-peak signal power to rms noise ratio at the receiver when the average incident optical power is dBm? r.12 Consider a quantum-noise-limited analog optical fiber system that uses a pin photodiode with a responsivity of 0.85 at 1310 nm. Assume the system uses a modulation index of 0.6 and operates in a 40-MHz bandwidth. If we neglect detector dark current, what is the signal-to-noise ratio when the incident optical ower at the receiver is —15 diAm?
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Robert · Accepted Answer

Ans:1  Signal to noise ratio for thermal noise limited for optical fiber is
SNR= Ip2/it2
Given:
Responsivity R= 0.85
Modulation Index  (m) =0.5
Incident Power(P)= -20dBm = 0.00001Watt
Photon Current (IP )= R * m * P
    = 0.85*0.5* .00001 = 4.25e-06 Amperes
Mean Square thermal noise current (it2 )= 2 x 10-23 A2 /Hz(given)
Bandwidth= 5MHz
it2  for 5MHz = 2 x 10-23  x 5x106  = 1e-16
Ans:

Consider a thermal-noise-limited analog optical fiber system that uses a pin photodiode with a responsivity of 0.85 at 1310 nm. Assume the system uses a modulation index of 0.5 and operates in a 5-MHz...

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