HIGHLIGHTED-Fiber-Optics-Communications.docx

A reduction in strength of the signal caused by

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b. A reduction in strength of the signal caused by folded dipole bends c. An attenuation increase caused by bends radiating from the side of the fiber d. All of these 103. Infrared range for fiber optics a. 400 – 700 nm b. 700 – 1200 nm c. 300 – 2000 nm d. 400 – 7000 nm 104. Which of the following is a disadvantage for plastic fiber optics? a. Noise immunity b. Electric hazards c. Higher losses d. All of these 105. OTDR stands for a. Optical Time Domain Reflectometer b. Optical Transmit Direction Return c. Optical Time Domain Time Regeneration d. Overtime Direct Reference 106. Which of the following is determined by an OTDR? a. Distance to trouble b. Length of fiber c. Refractive index d. All of these 107. Under normal condition, a single fiber should not be used for a two-way communication mainly because of a. Loss b. Fading c. Noise d. Attenuation 108. A single mode optical fiber has a core diameter of _____ nm. a. 0.1 b. 0.01 c. 0.2 d. 0.05 109. A step-index multimode optical fiber has a core diameter of _____ nm. a. 0.02 b. 0.2 c. 2 d. 0.002 110. The graded-index multimode optical fiber has a core diameter of _____ nm. a. 0.5 b. 0.05 c. 0.0005 d. 5 111. Which is not a possible cause of optical fiber loss? a. Impurities b. Glass attenuation c. Stepped index operation d. Microbending 112. The ratio of the speed of light in a vacuum and the speed of light in the material used. a. S/N ratio b. Refractive index c. Intermodal dispersion d. Monomode ratio 113. Splicing fibers means a. Fusion b. Butt
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c. Glue d. Both fusion and butt 114. An IC that represents a short distance one-way optical communications a. Optoisolator b. Insulator c. Multivibrator d. Optical IC 115. When light strikes a flat polished end of a fiber, it produces a loss of a. 14 % b. 4 % c. 10 % d. 1 % 116. When light strikes a flat polished end of a fiber, the fiber loss produced can be reduced by a. Splicing b. Antireflection coating c. Insulation jacket d. All of these 117. In fiber optics, higher-order mode refers to a. Cladding boundary at high angle b. Backscattering electromagnetic signals c. Diffracting signals d. All of these 118. The following are the cause of light attenuation in fiber optics except a. Backscattering b. Absorption c. Refraction d. Microbends 119. Why are visible-light LEDs not used for fiber optics? a. It has high losses b. It has short wave c. It has low attenuation d. It has weak signal 120. Optical cable testers are used for a. Checking refractive index b. Light power out of a fiber c. Non-calibrated light into a fiber d. Checking maximum distance covered 121. A function of an optic isolator a. Cancels reflective waves b. Amplifies signal transmitted c. Filters unnecessary signals d. All of these 122. An increase in light intensity produces fast optic switching due to a. Increase in index of glass b. Amplification of optical signal c. High gain d. Photoconductivity
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