OC 1ST MID IMP QUS....for ece 4th year studs!!!!! tomorw on words our mid exams will be started. 2) a). derive tha expretion for the wave guide dispertion and obtain tha reletion ship between mode number gama and beta. b). what is thw absorption in optical fiber? explain in brief tha different types of mechanisum of absorption in fiber. 3) a). prove that tha total num of modes enterng tha step index fiber is M=v/2. b). discuss tha advantages of optical fibers over conventional copper cables. 4) a). calucate tha number of modes at 820nm in a graded index having a parabolic index profile 1.90 of a 25 micro meter core radies n1=1.48 and n2=1.46 how does it compare to a step index fiber. b). explain tha following 1) cut of wave length 2) mode field dia meter 5) a). explain tha bending losses in a optical fiber. b). explain a bout stright sleeve conneters. 6) a). explain effective refractive index in detail with necessary mathematical expression. b). for a fiber material dispertion parameter is 58.8ps/nm/km tha reletive spectral width 8 lamida/lamida tha source is 0.0015 at tha wave length of 820nm caluculate r.m.s pulse broadening per km. 7) a). compare tha step index fiber and graded index fibers with a neat diagram. b). distinguish between material disperssion and wave guide disperssion. 8) a). a sing k mode fiber opereting at tha wave length of 1.3 micro meter is found to have a total metirial disperssion of 2.8ns and a total wave guide disperstion of 0.495ns. determine tha recived pulse width approximate bit rate of tha fiber if tha transimetted pulse has a width of 0.6ns. b). explain about rayleigh scattering and mic scattering. 9) a). explain a bout "chagenide glass fibers" and "plasic optical fibers". b). explain tha pulse dispertion with suitable diag in detail. 10)a). what are modes?? distinguish between single mode fiber and multy mode fiber given an account on LP modes. b). give any 3 applicetion of optical fibers for instrumentetion and explain then with tha necessary figers. all keep it mind....
Posted on: Thu, 22 Aug 2013 10:38:02 +0000
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