Transmission Characteristics of Optical Fiber » Exercise – 1
1. LEDs are used as light sources in :
(a) single mode fibers only
(b) multimode fibers only
(c) both single mode and multimode fibers
(d) none of the above
2. The loss in signal power as light travels down a fiber is called :
(a) dispersion
(b) scattering
(c) absorption
(d) attenuation
3. Dispersion is used to describe the :
(a) splitting of white light into its component colors
(b) propagation of light in straight lines
(c) bending of a beam of light when it goes from one medium to another
(d) bending of a beam light when it strikes a mirror
4. Which of the following is used as an optical transmitter on the Fiber Optical Communications ?
(a) APD
(b) LSA diode
(c) PIN diode
(d) LED
5. What type of fiber has the highest modal dispersion ?
(a) step-index multimode
(b) graded index multimode
(c) step-index single mode
(d) graded index mode
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