HIGHLIGHTED-Fiber-Optics-Communications.docx

A power loss b absorption loss c resistive loss d

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A. power loss B. absorption loss C. resistive loss D. heat loss 224. It is caused by valence electrons in the silica material from which the fiber are manufactured. A. ion resonance absorption B. infrared absorption C. ultraviolet absorption D. visible light absorption 225. It is a result of photons of light that are absorbed by the atoms of the glass core molecule. A. ion resonance absorption B. infrared absorption C. ultraviolet absorption D. visible light absorption 226. It is caused by hydroxide ions in the material A. visible light absorption B. infrared absorption C. ultraviolet absorption D. ion resonance absorption 227. Which type of fiber-optic cable has the least modal dispersion? A. single-mode step-index B. multimode step-index C. single-mode graded-index D. multimode graded-index 228. For a single mode optical cable with 0.25 dB/km loss, determine the optical power 100 km from a 0.1- mW light source. A. -45 dBm B. -15 dBm C. -35 dBm D. –25 dBm 229. Light rays that are emitted simultaneously from an LED and propagated down an optical fiber do not arrive at the far end of the fiber at the same time results to A. intramodal dispersion B. pulse length dispersion C. modal dispersion D. wavelength dispersion 230. Chromatic dispersion can be eliminated by __________. A. using a monochromatic light source B. using a very small numerical aperture fiber C. using a graded-index fiber D. using a very sensitive photo detector 231. Type of bend that occurs as a result of differences in thermal contraction rates between the core and the cladding material. A. Macrobending B. Microbending C. Quad bending D. Constant-radius bending 232. These bends are caused by excessive pressure and tension and generally occur while fiber are bent during handling or installation. A. microbending B. macrobending C. constant-radius bending D. kinks 233. As light is coupled in a multiport deflective device, the power is reduced by A. 1.5 dB B. 0.1 dB C. 0.5 dB D. 0.001 dB 234. It is caused by the difference in the propagation time of light rays that take different paths down the fiber. A. modal dispersion B. microbending C. Rayleigh scattering D. chromatic dispersion 235. How can modal dispersion reduced entirely? A. Use a graded index fiber B. Use a single-mode fiber C. Use a monochromatic light source D. Use a very sensitive light detector 236. It indicates what signal frequencies can be propagated through a given distance of fiber cable. A. Bandwidth Distance Product B. Pulse width dispersion C. Rise time D. Cutoff frequency
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237. For a 300-m optical fiber cable with a bandwidth distance product of 600 MHz-km, determine the bandwidth.
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