PDH Engineer     PE PDH
PDH Online

Introduction to Fiber Optics


Quiz Questions

1.A fiber optic data link sends input data through fiber optic components and provides this data as output information.
True
False
2. A fiber optic data link consists of three parts-transmitter, optical fiber, and receiver.
True
False
3.Multimode and double mode fibers are the two types of fiber optics.
True
False
4.Substances through which some light rays can pass, but through which objects cannot be seen clearly because the rays are diffused, are called ______________
Translucent
Transparent
Opaque
5.Light will always travel faster in the fiber material than in air.
True
False
6.Law of reflection states ______________.
Angle of incidence is equal to the angle of reflection
Angle of incidence is equal to the angle of refraction
7.Attenuation in an optical fiber is caused by absorption, scattering, and bending losses.
True
False
8.In ____________ fibers, the refractive index of the core is uniform and undergoes an abrupt change at the core-cladding boundary.
STEP-INDEX
GRADED-INDEX
9.A _____________________ is a permanent joint between two fibers or two groups of fibers.
Fiber optic splice
Fiber optic connectors
Fiber optic couplers

10.Star and tree couplers are dual port couplers that have two input or two output ports.
True
False
11.The MODE POWER DISTRIBUTION (MPD) is the distribution of radiant power among the various modes propagating along the optical fiber.
True
False
12.In mechanical splices, mechanical fixtures hold the two optical fibers in alignment for an indefinite period of time without movement. The amount of splice loss is stable over time and unaffected by changes in environmental or mechanical conditions.
True
False
13.An optical splitter is a passive device that splits the optical power carried by a single input fiber into two output fibers.
True
False
14.A symmetrical coupler transmits the same amount of power through the coupler when the input and output fibers are not reversed.
True
False
15.__________is the spreading of the light pulse as it travels along the fiber caused by dispersion. It reduces the bandwidth, or information-carrying capacity, of an optical fiber.
Pulse distortion
Pulse absorption
16.The principal _______________used in fiber optics are semiconductor light-emitting diodes (LEDs) and laser diodes (LDs).
Light sources
Optical sources
17.___________________continuously vary the output optical power level as a function of the input electrical signal.
Analog transmitters
Digital transmitters
18.SLEDs are abbreviated as_______________
Surface emitting LEDs
Super luminescent LEDs
19.The ___________is the time it takes electrons to travel out of the detector active area.
Transit time
Response time
20.Optical fibers or cables should never be bent at a radius of curvature less than a certain value, called the minimum bend radius
True
False