HIGHLIGHTED-Fiber-Optics-Communications.docx

Photovoltaic diode c phototransistor d avalanche

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b. Photovoltaic diode c. Phototransistor d. Avalanche photodiode 83. Photodiodes operate property with a. Forward bias b. Reverse bias c. Neither A or B d. Either A or B 84. 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 85. Which fiber-optic system is better? a. 3 repeaters b. 8 repeaters c. 11 repeaters d. 20 repeaters 86. An important requirement for successful transmission system using light a. Powerful, reliable light source b. Strong glass c. Reliable, high cost transmission medium d. Powerful regenerators 87. What is used to block light from a laser and let other light through a. Neutral density b. Color c. Interference d. Spatial 88. ________ is a light that can be coherent a. Spontaneous emission b. Monochromatic and in-phase c. Narrow beam divergence d. Monochromatic 89. Coherence of laser light is important for _________ a. Light propagation b. Getting laser light to pass through air c. Drilling holes d. Holography 90. The ultrapure glass used to manufacture optical fibers is approximately ___pure a. 99.9 % b. 99.99 % c. 99.999 % d. 99.9999 % 91. In fiber optics, PCS stands for a. Plastic-clad-silica b. Polyethylene-clad-silica c. Personal carrier system d. Personal communication 92. How many longitudinal modes can fall within a laser’s gain bandwidth? a. 2 b. 5 c. 9 d. No fixed limit, dependent on bandwidth and mode spacing 93. _________ is the result of photons of light that are absorbed by the atoms of the glass core molecules a. Ion resonance absorption b. Ultraviolet absorption c. Infrared absorption d. Absorption loss 94. In fiber optics, SCS stands for a. Suppressed-clad-silicon b. Silicon base-class-silica c. Silica-clad-silica d. Serial-clad-silicon
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95. Human laser was developed by A. Javen at Bell laboratory in a. 1960 b. 1962 c. 1963 d. 1964 96. What parameter of light detector determines the range or system length that can be achieved for a given wavelength? a. Transit time b. Spectral response c. Dark current d. Responsitivity 97. Dark current in light detectors is caused by a. Thermally generated carriers in the diode b. The absence of light input c. Small leakage current d. Its imperfection 98. What is the unit of responsitivity? a. Ampere/volt b. Ampere/watt c. Watt/ampere d. Volts/ampere 99. One of the following is not a characteristic of light detectors. a. Responsitivity b. Spectral response c. Transmit time d. Dispersion 100. What is the typical wavelength of light emitted from epitaxially grown LEDs? a. 840 nm b. 490 nm c. 480 nm d. 940 nm 101. SONET stands for a. System Optical Network b. Synchronous Optical Network c. Silica Optic Network d. System Optical Fiber Net 102. Band loss is a. A reduction in transmitter power caused by earth’s surface curvature b. A reduction in strength of the signal caused by
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