COMMUNICATION ENG. PROF. A.M.ALLAM Assignment HW1 LECTURES

OPTICAL FIBER COMMUNICATION SYSTEM (NETW702) IET--- ASSIGNMENT-HW1 Name :………………………………………………………………… ID :………………………………………………………………… 1- A beam of light is incident on a plane boundary between two dielectrics. The incident–ray angle is at 10o to the boundary normal and the transmitted beam is at 12o. Which of the two media has the higher refractive index? 2- The velocity of light in the core of a step index fiber is 2.01x108 m/sec, and the critical angle at the core-in cladding interfaces 80 degree .Determine the numerical aperture and the acceptance angle at the fiber in air, assuming it has a core diameter suitable for consideration by ray analysis .The velocity of light in vacuum is 3x 108 m/sec. 3-Show that the NA of the symmetrical slab is equal to n (2Δ)1/2 if n is approximately equal to n and Δ is the fractional change in the refractive index 4- A single mode step index fiber has core and cladding refractive indices of 1.523 and 1.514 respectively. -Determine the core diameter required for the fiber to permit its operation over the range 1.45 to 1.6um. -Determine the wavelength which will allow us to use a single mode fiber with a core diameter of 10um

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