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Transmission Characteristics of Optical Fiber – 1 – 2

6. ………. dispersion is caused by the difference in the propagation times of light rays that take different paths down a fiber.

(a)  material dispersion
(b)  wavelength dispersion
(c)  modal dispersion
(d)  delay dispersion

ANSWER

EXPLANATION

7. A non-coherent light source for optical communications system ?

(a) ILD
(b) LED
(c) APD
(d) 
PIN Diode

ANSWER

EXPLANATION

8. Which of the cable length has the highest attenuation ?

(a) 1 km
(b) 2 km
(c) 95 ft
(d) 
5500 ft

ANSWER

EXPLANATION

9. Which of the following is used as an optical receiver in fiber optics communications ?

(a) APD
(b) Tunnel diode
(c) Laser diode
(d) 
LED

ANSWER

EXPLANATION

10. Cable attenuation is usually expressed in terms of :

(a) loss/foot
(b) dB/km
(c) intensity/mile
(d) voltage drop/inch

ANSWER

EXPLANATION

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