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Optical communication: Quiz


Question 1: The transmitters in optical fiber links are generally light-emitting diodes (LEDs) or ________.
Gallium arsenideLaser diodeVertical-cavity surface-emitting laserFiber-optic communication

Question 2: There are many forms of non-technological optical communication, including ________ and sign language.
AutismBody languageAttentionBoredom

Question 3: An optical communication system consists of a ________, which encodes a message into an optical signal, a channel, which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal.
Amateur radioRadioTransmitterBroadcast engineering

Question 4: The light systems communicate the correct position of the aircraft relative to the best landing ________.
VHF omnidirectional rangeInstrument landing systemMarker beaconInstrument approach

Question 5: ________ light, rather than visible light is used more commonly, because optical fibers transmit infrared wavelengths with less attenuation and dispersion.
InfraredUltravioletElectromagnetic spectrumX-ray

Question 6: Optical communication is any form of telecommunication that uses ________ as the transmission medium.

Question 7: Techniques such as ________, ship flags, smoke signals, and beacon fires were the earliest form of technological optical communication.
Semaphore lineParisLondonBerlin

Question 8: The ________ uses a mirror to reflect sunlight to a distant observer.
TelegraphyHeliographMorse codeElectrical telegraph

Question 9: The need for periodic signal regeneration was largely superseded by the introduction of the ________, which extended link distances at significantly lower cost.
Optical amplifierOpticsDispersion (optics)Optical fiber


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