Fiber Optics Practice Exam Questions
and Answers
Light is electromagnetic energy with a (blank) frequency and a (blank) wavelength compared to
radio waves. - Answer-Higher, Shorter
What type of light is used in Fiber Optic transmissions? - Answer-IR
What are the 4 items are needed for a fiber ...
What two light sources are used with multimode fiber? - Answer✔✔-Light Emitting Diode,
Vertical Cavity Surface Emitting Laser
All wavelengths of light travel at the same speed. True or False - Answer✔✔-False
Which type of fiber has the larger core size? Single mode or multimode? - Answer✔✔-
Multimode
What is OSHA responsible for? - Answer✔✔-Creating and enforcing workplace safety rules
What are the two ways to reduce modal dispersion? - Answer✔✔-Using graded index fiber,
shrinking the core size
What happens to the wavelength in optical fiber when the number of modes increase? -
Answer✔✔-The wavelength gets shorter
Where does Fresnel reflection occur? - Answer✔✔-In intermechanical connections and air gaps
What is it called when light bends when moving between water and air? - Answer✔✔-
Refraction
What is the refractive index of the core and cladding of MM optical fiber? - Answer✔✔-Core:
1.457, Cladding: 1.42
Single-mode systems usually operate at what three wavelengths? - Answer✔✔-1310nm,
1550nm, 1625nm
What two multimode wavelengths are the most commonly used? - Answer✔✔-850nm, 1300nm
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