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Explain the two three-wave interactions which give rise to the stimulated Brillouin scattering phenomenon in optical fibres, including the part played by electrostriction. If the backscattered optical frequency is shifted by 11.75 G Hz from the forward, pump wave at 1550 nm what is the acoustic velocity in the fibre medium if its refractive index is 1.46 at the pump wavelength? Devise a purely electronic means for measuring the amplitude of the frequency-shifted signal, using only a PIN photo detector.
consider a ntnr 44 mimo channel. for the input of the channel x x1x2x3x4 assume that each xi is drawn from a bpsk
Design a BJT mixer with conversion gain of 10dB for an IF load of 1 kohm and a LO amplitude of 10 mV. The RF frequency should be 707 KHz and the IF frequency should be 455 KHz. Hint: calculate the bias components for a VCC of 9 V
What is the minimum of bits in its instruction codeword How would your answer change if you also knew that 30% of the possible permutations of instruction word bits are not used
This bar is made of AISI 1006 cold-drawn steel and is loaded by the forces F=0.55 kN and T=25.N.m. Use both the maximum-shear theory and the distortion-energy theory to design the bar diameter D.
the closed limb of a macleod gauge has a diameter of 1mm and a value v above the level of the opening w of 250cm3.
Without using a truth table, find: (a) the minterm and maxterm expansions for F in algebraic and decimal forms (SOM,POM) (b) the minterm and maxterm expansions for F' in decimal form (SOM,POM).
Write an HDL behavioral description of a four-input priority encoder. Use a four-bit vector for the D inputs and an always block with if-else statements. Assume that input D[3] has the highest priority.
A quick description of R5 is needed before the next calculation can be completed. R5 is called a sampling resistor. R5 is put in series with the power supply so it shares the same current as the circuit. This is the TOTAL current
A torque of magnitude T = 2 kip.in. is applied to each of the steel bars shown. Knowing that all = 6 ksi, determine the required dimension b for each bar.
Convert the current source into its equivalent voltage source and again determine the current through the load.
Five periods of the signal s(t)=sin(2500pi*t) are sampled at a sampling frequency of 4000 Hz. a. Does this sampling frequency meet the Nyquist requirement for the signal? b. How many samples are collected
A gas occupying a volume of 25 ft3 weights 3.5 lbs on the moon, where the acceleration of gravity is 5.47 ft/s2. Determine its weight, in lbf, and density, in lb/ft3, on Mars, where g= 12.86 ft/s2.
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