Name: 
 

How Fiber Works



Multiple Response
Identify one or more choices that best complete the statement or answer the question.
 

 1. 

The three types of optical fiber are _______.
 a.
Multimode Step Index
 b.
Multimode Graded Index
 c.
Armored
 d.
Singlemode
 

True/False
Indicate whether the statement is true or false.
 

 2. 

Singlemode fiber becomes singlemode when the core diameter is decreased to just a few times larger than the wavelength of light it transmits.
 

 3. 

Light rays bend at the boundary of two optical materials (like water and air or two types of glass) due to the change in the index of refraction of the materials.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 4. 

The way light travels in an optical fiber can be described by ________.
a.
Pythagorean theorem
b.
Calculus
c.
Snell’s Law
d.
Moore’s Law
 

 5. 

The structure of the core of a multimode graded-index fiber looks like a _________.
a.
Magnifying glass
b.
Lens from a lighthouse
c.
Digital camera zoom lens
d.
Pinhole
 

 6. 

In _______ fiber, the modes or light rays travel in straight lines.
a.
Step index multimode
b.
Graded index multimode
 

 7. 

In _______ fiber, the modes or light rays travel in curved lines.
a.
Step index multimode
b.
Graded index multimode
 

 8. 

The complex multilayer core of multimode graded-index  is designed to minimize _________.
a.
Dispersion to maximize bandwidth
b.
Loss due to absorption
c.
Loss due to scattering
d.
Polarization
 

 9. 

The difference in the core of GI MMF and SI MMF is to designed to affect the ________ of the fiber
a.
Attenuation
b.
Bandwidth
c.
Ease of manufacture
d.
Cost
 

 10. 

The principle of __________ is why the core of an optical fiber can trap the light and transmit it long distances.
a.
Fused glass
b.
Hygrometry
c.
Scattering
d.
Total internal reflection
 



 
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