1. Engineering
2. Electrical Engineering
3. can you answer all of the questions please 1 compare...

# Question: can you answer all of the questions please 1 compare...

###### Question details

Can you answer all of the questions please

1) compare the relative advantages of fiber systems operating at 800,1300, and 1550 nm.

2) Two multimode fibers are being connected with an air gap between them. The air gap is now filled with an index-matching fluid that is not perfect: It has a refractive index of 1.4, while the fiber core has an index of 1.48. Compute the reflected-power level (in dB) with respect to the incident-power level. In your calculations, include the two interfaces (fiber-to-matching-fluid and matching-fluid-to-fiber).

3) The temperature of a receiver is 35 C, its bandwidth is 6 MHz, and the load resistance 50 2. (a) Compute the rms (root-mean-square) thermal-noise current. (b) Compute the rms thermal-noise voltage that appears across the resistor and the thermal-noise power generated c) Repeat this problemn if the resistance is changed to 50,000 Ω.

4) An analog system has a bandwidth of 10 MIz, a photodetector whose responsivity is 05 A/W (it has no gain) and whose dark current is 1 nA, and a SNR of 50 dB when the optic mod- ulation factor is 04. The receivers temperature is 27°C and the load resistance is so Ω How much optic power (on average) must reach the receiver?

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