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Problem 1: 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 * 10-23 A2/Hz. What is the peak-to-peak signal power to rms noise ratio at the receivers when the average incident optical power is-20dBm?
Problem 2: 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-MNz bandwidth. If we neglect detector dark current, what is the signal-to-noise ratio when the incident optical power at the receiver is -15dBm?
If we have a 600ohm transmission line terminated with a 1200ohm resistor, how long must the transmission line be if the input impedance is purely real?
A step-down transformer has a 120V rms primary voltage applied and a 12V rms voltage is measured at thesecondary. Assuming the transformer can be considered ideal,determine the turns ratio, n.
the arrival rat of cars at a toll plaza is 50 cars per hours. There are three boothes serving an a verage of 20 cars per hour. Assume an exponential for service time and a poisson distribution for arrival time.
Determine the minimum signal to noise ratio (s/n) in dB required in each communication channel to achieve a data rate of 270 kbps?
Each of three coins has two sides, heads and tails. Represent the heads or tails status of each coin by a logical variable (A for the first coin, B for the second coin, and C for the third) where the logical variable is 1 for heads and 0 for tails..
a. The mass of an electric car is 900 kg including the passengers. A single motor mounted on the front wheels drives the car, and the radius of the wheel is 0.3 m. The car is going downhill at a speed of 50 km/hr, and the slope of the hill is 30 d..
2 single-phase AC motors connected in parallel are fed from a220 volt source. The motors have the following ratings: Motor #1: 220V, POUT = 50 hp, Efficiency = 82%, PF =0.82 lagging Motor #2: 220V, POUT = 75 hp, Efficiency = 86%, PF =0.85 lagging
Design a 1024x16 RAM using the 256x8 RAM blocks and neccessary combinational circuit. Note that, 256x8 RAM block has 8 bit data (DATA), 8 bit address (ADRS), chip select (CS), read/write (R/W) inputs and a three-state output bus.
Assume that Load 1 is Y-connected. What are the phase voltage and currents in that load? Solve in per unit and convert to real volts and amps
Discuss the major difference(s) in operational characteristics for latches vs. flip-flops: compare the timing diagrams for the D latch and D-type positive-edge triggered flip-flop.
A 5-element uniform linear array with inter-element spacing of λ/2 is to have maximum radiation in the direction θ=60° , find the current phases , find the directions of null radiation , hence sketch the radiation pattern , find also the relative ..
Restricting yourself to nondegenerate dopings and also requiring the resistance to be readily measured with a hand-held multimeter (say 1 R 1000), what is the range of doping Pick a doping concentration in the mid range.
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