HIGHLIGHTED-Fiber-Optics-Communications.docx

Directly proportional to its bandwidth b directly

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a. Directly proportional to its bandwidth b. Directly proportional to the Planck’s constant c. Directly proportional to Boltzmann’s constant d. Inversely proportional to the Planck’s constant 142. Refractive index of glass a. 1.0 b. 1.2 c. 1.4 d. 1.5 143. Refractive index of diamond a. 1.0 b. 1.4 c. 1.8 d. 2.0 144. What is the unit of light wavelength? a. Micrometer b. Angstroms c. Mils d. Fathom 145. How much is the power loss of the fusion splice? a. 0.1 dB or less b. 0.01 dB or less c. 1 dB or less d. 10 dB or less 146. Used to test a fiber optics splice a. Spectrum analyzer b. Oscilloscope c. Optical power meter d. Field strength meter 147. A coupler which consists of a series of lenses and a partly reflective surface a. Beam-splitting coupler b. Reflective star coupler c. Fused coupler d. None of these 148. Reflections in many directions a. Diffuse reflection b. Diffraction c. Scattering d. Dispersion 149. Commonly used electro-optic crystal for polarization modulation a. Lithium Niobate b. Tourmaline c. Sodium Chlorate d. Sphalerite 150. Which modulation methods are the most widely used in optical systems?
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a. Phase and frequency modulations b. Polarization modulation and phase modulation c. Intensity modulation and phase modulation d. Intensity modulation and polarization modulation 151. A device that was constructed from mirrors and selenium detectors that transmitted sound waves over a beam of light. A. lightphone B. photophone C. cameraphone D. walletphone 152. Which fiber-optic system is better? A. 3 repeaters B. 8 repeaters C. 11 repeaters D. 20 repeaters 153. What is the frequency limit of a copper wire? A. approximately 0.5 MHz B. approximately 1.0 MHz C. approximately 40 GHz D. none of the above 154. They were granted patents for scanning and transmitting television images through uncoated fiber cables. A. Baird and Hansel B. Bockham and Kao C. Kapron and Keck D. Maiman and Schawlow 155. The product of the bit rate and distance of a fiber- optic system is 2 Gbits-km/s. What is the maximum rate at 5 km? A. 100 Mbits/s B. 200 Mbits/s C. 400 Mbits/s D. 1000 Gbits/s 156. Approximately what is the frequency limit of the optical fiber? A. 20 MHz B. 1 MHz C. 100 MHz D. 40 GHz 157. They experimented with light transmission cables through bundle of fibers and lead to the development of flexible fiberscope. A. Townes, Schawlow and Kao B. Maiman, Kao and Bockham C. Maurer, Kapron and Keck D. Van Heel, Hopkins and Kapany 158. Photodiodes operate properly with A. forward bias B. reverse bias C. neither forward nor reverse bias D. either forward or reverse bias 159. He coined the term “fiber optics” in 1956.
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