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Transmission Characteristics of Optical Fiber – 1 – 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

ANSWER

EXPLANATION

2. The loss in signal power as light travels down a fiber is called :

(a) dispersion
(b) scattering
(c) absorption
(d) 
attenuation

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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