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An erbium-doped fiber amplifier has a noise figure of 4 and a gain of 10 dB. The optical input has a 30-dB signal-to-noise ratio and a signal power of 10 µW. Compute the output signal power in mW and signal-to-noise ratio (in dB) at the amplifier's output.
An infinitesimally thin metallic cylindrical shell of radius 4.00 cm is centered on the z-axis, and has an evenly distributed charge of 100 nC per meter length of shell. (a) Determine the value of the surface charge density on the conductive shell
Identify three test cases, one using a positive number, and one using a negative number, and one using incorrect input (ie. Input a letter rather than a digit for the numeric input). For each of the three test cases show what inputs you will use a..
General questions for network communications, A user message is split into 15 frames, each of which has an 80% chance of arriving error-free. If no error control is used by the data link layer, how many times must the message be sent on the averag..
A long shunt cumulative compound motor is run at full load. It is rated 240 V, 10 A, 1200 rev/min. If Rf=180 ?, Ra=2 ?, Rs=1.22 ?, and the stray power losses are 160 W, find: a. The back EMF. b. The power rating.
An ideal non-degenerate silicon step junction diode with an intrinsic level Ei exactly at mid band-gap is fabricated. Answer all questions related to this diode. a) If Vbi = 0.65V and NA=4ND, what is the doping concentration in the quasi neutral n ..
The input impedance of a certain antenna is 30+ j40 ohms and the rms voltage across the terminal is 100 V. If the antenna were 100 percent efficient, determine the total radiated power in watts.
An AM modulator operates with the message signal: m(t) = 9 cos(20πt) - 8 cos(60πt). The unmodulated carrier is given by 110 cos(200πt), and the system operates with an index of 1/2. a. Write the equation for mn(t), the normalized signal with a mini..
Derive an expression for the optimum value of the avalanche gain opt M for which the signalto-noise ratio (SNR) becomes optimum by using the following expression for the excess noise factor: Fa( M)=KM+ (1-K ) (2-1/M). Assume that M^3 >> M .
A reservoir-type small hydroelectric system has a penstock that is 2 m in diameter,The speed of water at exit end of the penstock is 10 m/s.assume that the power coefficient is 40%,the turbine efficiency is 80%
Main Memory size is 256K words, Cache size is 16K words block size is 32 bytes Show the mapping in terms of tag, index and block offset for direct map, 4 way set associative, fully associative
Give an example of an RC circuit whose transient behavior cannot be modeled by having a function generator with square wave output replacing the mechanical switch.
a load made up of a 100 ohm resistor in series with a 20 nF capacitor is connected across a 2400V (rms), 60 Hz voltage source. Find the complex power being delivered to the load and the power factor. state whether it is lagging or leading.
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