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 dispersion7. A non-coherent light source for optical communications system ?
(a) ILD
(b) LED
(c) APD
(d) PIN Diode
8. Which of the cable length has the highest attenuation ?
(a) 1 km
(b) 2 km
(c) 95 ft
(d) 5500 ft
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
10. Cable attenuation is usually expressed in terms of :
(a) loss/foot
(b) dB/km
(c) intensity/mile
(d) voltage drop/inch
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