ASSIGNMENT II
1. Determine Determine the signal signal attenuation attenuation per kilomete kilometerr for optical optical fiber of of length 10km,assum 10km,assuming ing no splices and connectors, when the mean optical power launched is 100μW and the output power is 5μW. 2. Determine Determine the overall overall signal signal attenuation attenuation for optical optical fiber fiber of length length 20km with spices spices at 2km intervals, each giving an attenuation of 1.5d,when the mean optical power launched is 200μW and the output power is 15μW. !. "alculate "alculate the macroben macrobend d loss of a #$ fiber with with inde% inde% profile profile &'2,core &'2,core diameter diameter of 50μm,and wavelength (50nm,bent curve radius )'2.0cm.*he core refractive inde% is 1.+5, -'0.21, '0.02. +. /or an optical optical fiber fiber communicati communication on sstem sstem of 2km length,t length,the he !d pulse pulse width width at the input and output are 0.5ns and 10ns,respectivel./ind the pulse broadening for the fiber and the ma%imum bit rate. 5. -n optical optical power of of 10μW is is fed into into fiber of of 10 km length.*he length.*he output output power power is found to to be 5 μW. "alculate 1 a3 4ver 4verall all loss loss in in d assum assuming ing no conne connecto ctors rs or spli splices ces 2 b3 b3 4ve 4vera rall ll loss loss in dk dkm m c3 4verall signal attenuation for 20km optical link using the same fiber with splices at 2km interval, each of 1d attenuation. d3 *he numerical inputoutput power ratio in partc3. 6. -n optical optical fiber fiber has losses losses of 0.6dkm 0.6dkm at at 1!00nm.$f 1!00nm.$f 100μW 100μW of power power is in7ected in7ected into into the fiber, how much power will reach at a distance of 20km8 9. "alculate the macrobend loss loss of a #$ fiber with inde% profile profile &'1,core diameter of 50μm, wavelength (50nm,bent curve radius )'1.5cm.*he core refractive inde% is 1.+5,-'0.+,'0.02. (. "alculate the critical radius of curvature at which large bending losses occurs in a multimode fiber, with core refractive inde% of 1.+5,relative refractive inde% difference of +:,and an operating wavelength of 0.(5μm. ;. Determine the attenuation in dkm due to )aleigh scattering in silica at an operating wavelength of 900nm. )efractive inde% is 1.+6 and the photoelastic coefficient is 0.2;. 10. "alculate the waveguide dispersion at 1550nm for a singlemode fiber with core and cladding diameter of ;μm and 125μm,respectivel. 125 μm,respectivel.core core refractive inde% n1'1.+5 and relative refractive inde% difference is 0.+:
