Lesson 5 - Optical Fiber

Question 1

Singlemode (SM) fiber has ? light-carrying core than multimode (MM) fiber.

a. a larger
b. a smaller
c. the same size

Answer 1

b. a smaller

Question 2

What is the core size of singlemode fiber?

a. 5 mm
b. 9 microns
c. 50 microns
d. 63.5 microns

Answer 2

b. 9 microns

Question 3

Singlemode fiber has ? bandwidth than multimode fiber.

a. less
b. more
c. the same

Answer 3

b. more

Question 4

What wavelength are appropriate for use with multimode fiber?

a. 650 and 850 nm
b. 850 and 1300 nm
c. 850 and 1310 nm
d. 1310 and 1550 nm

Answer 4

b. 850 and 1300 nm

Question 5

The diameter of the core in OM2 and OM3 
 multimode fiber is how large?
a.  50 microns
b.  62.5 microns
c.  62.5 mm
d.  9 mm

Answer 5

a. 50 microns

Question 6

Which of the following fiber specifications is most important to the user and is an important factor in testing?

a. attenuation
b. bandwidth
c. core-cladding concentricity
d. numerical aperture

Answer 6

a. attenuation

Question 7

The largest contributor to fiber attenuation is ?.

a. absorption
b. bending losses
c. microbends
d. scattering

Answer 7

d. scattering

Question 8

Which fiber typically has the largest core?

a. multimode step index
b. multimode graded index
c. plastic optical fiber (POF)
d. singlemode

Answer 8

c. plastic optical fiber (POF)

Question 9

The loss of a multimode graded index fiber is greatest at ?.

a. 850 nm
b. 1300 nm
c. 1310 nm
d. 1550 nm

Answer 9

a. 850 nm

Question 10

Which type of dispersion affects singlemode fiber as well as multimode fiber?

a. differential
b. chromatic
c. modal
d. polarization mode

Answer 10

b. chromatic