Survey Exam 2

Survey Exam 2 - EE 4270 Survey Exam November 28, 2005 - Q...

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Unformatted text preview: EE 4270 Survey Exam November 28, 2005 - Q 77 l\. Answer‘four of the five questions only, clearly indicating the question not to be graded. Print your name above, and on the back of this booklet. {You may use, when appropriate: F = g . ma, R=K1MNA, DOF=K2)t/NA2, a) = Column --------- -- )td/ncuo, 1/s1+1/32= 1/f, E = mc2, Seat ...... .... " n1sin91 = n2sin92} 1) Sketch an energy level diagram for a four level laser. Indicate the relative populations in the levels both before and after excitation. Show the metastable level and the lasing transition. Find an‘expression for the wavelength at which lasing occurs. 2) A laser beam is modulated by either an acousto-optic modulator or an electro-optic modulator. If the modulators (and the laser beam) are made half as wide, what are the effects (if any) on ‘ A0 mod E0 mod a) The rise time of the transmitted light. ......... . .7." ...... .. b) The electrical drive required for modulation. . . . . . . . . . . . . c) The extinction ratios. .. . . . . . . . . . . . . . . . . .. i d) The minimum size to which the laser beam can be focused. 2< ...... .. 2A ...... .. _. L f e) The maximum amount of light that can be transmitted. bl . .. . v . . . gill? ) x \. 15 11< «De/i 5wal/Pr‘; l\ L) That '3: C 1.5 32x 1&r‘5‘9’“? 3) Design a fiber optic link between Baton Rouge and New Orleans (125 Km), based on the following specs: a) Fiber loss: 0.2 dB/Km a v Z“; A” b) Maximum fiber length: 10 Km ‘l‘ir'Zch '73 0) Maximum loss per splice: 0.5 dB ' 7t an, (1) Maximum amplifier gain: 25 dB The signal starts out at full strength, and should be at full signal strength at the end of the fiber link, so the fiber optic guide should terminate with an amplifier. Specify how many amplifiers are required, where they may be located, and what minimum gains they should have. 1H9 -“ Med dig; logbq A W «sabr- TAD“ 59‘-« Aug-1,4 arm W AM) + IBM ‘ L ' ‘ » . ‘l (91 W—e—gd—rh—ww-ms 4,- j . fl - Hum-r ' 3» -' - a - 'v ' ‘ ""A? IY‘Zl-r.’ T M-(Sdb+7.b2db)+13 NW 4),Twobeams of monochromatic light are incident on the same surface. The int sity of ,2 and of the other is 100 mW/cm.2 Find the maxi ' one beam is 1 m 5) a. The lattice constant, or space between crystal planes in some particular crystal is 0.5 nm. It is observed that when X—rays are incident at an angle of 30 degrees to the normal, they are diffracted with high efficiency at a complementary angle‘of 30 degrees. What is the wavelength of the X-rays? " x.‘ ‘ 0(7 / 1X...» ' b. It is observed that a collimated beam of light is diffracted by an angle of 30 degrees when it is incident on a grating of period 1 micron. What is the wavelength of the light? . 11m _ _ my Mm kwsmgr [VI szirf 0% NMT’II/ .4 ,_7 M--lstL\Ab—q=,_j_1_fllw “fir- u (a?) \25 km 14% Qms ” D ‘2 dg’h‘iW‘ 1‘3 Km WLQK $9242 9204/; '05 0W5] W» Athfl (“Ea-AA ‘5! [Ncow’ufle/T’ PIA/4m; ngfiZU 144‘:wa Cous'mwny QWAAUWC (D \m j \ N Wg‘I/Lifw @ \M 9 ~ 9 C190 (3 ...
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Survey Exam 2 - EE 4270 Survey Exam November 28, 2005 - Q...

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