FIBER OPTICS PART 2

The following are disadvantages of fiber optics communication systems,

• wider bandwidth
• interfacing costs
• strength
• specialized tools and equipment

An optical coupler has two input ports and one output port. Which of the following types of couplers is it?

• optical splitter
• optical combiner
• star coupler
• tree coupler

The wavelength of green light in air is _______ the wavelength of green light in fiber-optic cable.

• less than
• equal to
• greater than
• none of the above

The cladding performs all except which of the following functions?

• reduces the loss of light from the core
• reduces the scattering loss at the surface of the core
• protects the fiber core from absorbing surface contaminants
• reduces mechanical strength

Which of the following is not a common type of fiber-optic cable?

• single-mode step-index
• multimode graded-index
• single-mode graded-index
• multimode step-index

Which of the following is not an advantage of a fiber optic cable?

• bandwidth
• weight
• mobility
• crosstalk

An optical coupler has one input port and several output ports. Which of the following types of couplers is it?

• T-coupler
• star coupler
• tree coupler
• optical splitter

What is the definition of a bound ray?

• a ray that cannot move
• a ray that travels in the air
• a ray that is refracted out of the fiber
• a ray that propagates through the fiber by total internal reflection

Cable attenuation is usually expressed in terms:

• loss per foot
• dB/km
• intensity per-mile
• voltage drop per inch

An optical coupler has several input ports and several output ports. Which of the following types of couplers is it?

• X-coupler
• T-coupler
• star coupler
• tree coupler