Fiber Optic Light Sources

Question 1

What are the two light sources used in fiber optics?

Answer 1

Lasers and Light Emitting Diodes (LED’s)

Question 2

What does LASER stand for?

Answer 2

Light Amplification by the Stimulated Emission of Radiation

Question 3

What are the two types of LED’s used in fiber optic communication systems?

Answer 3

Surface Emitting and Edge Emitting

Question 4

What is the process in which and LED operates?

Answer 4

Spontaneous Emission

Question 5

What type of LED uses a homojunction structure?

Answer 5

Surface Emitting

Question 6

What type of structure does a Edge Emitting LED use?

Answer 6

Heterojunction structure

Question 7

What is the process in which a LASER creates photons?

Answer 7

Stimulated Emission

Question 8

LED’s emit photons that are out of phase, these photons are referred to as?

Answer 8

Incoherent Light

Question 9

LASER’s emit photons that are in phase, this is called?

Answer 9

Coherent Light

Question 10

What is overfilled launch?

Answer 10

The process in which an LED transmitter overfills the multimode fiber.

Question 11

What are the three families of LASER’s used in fiber optic communications?

Answer 11

Vertical-Cavity Surface Emitting Laser (VCSEL), Fabry-Perot (FP), and Distributed Feedback (DFB)

Question 12

What is the spot size of FP and DFB lasers?

Answer 12

10um

Question 13

What is the spot size of a VCSEL?

Answer 13

20um

Question 14

What is the spot size of an LED?

Answer 14

80um

Question 15

What type of LASER does laser-optimized multimode fiber use?

Answer 15

VCSEL