Question

which of the following light sources are used to generate light pulses in a fiber optic...

which of the following light sources are used to generate light pulses in a fiber optic cable?
lasers only
lasers and LED's
LED's only
refracted natural light sources.

Engineering   Electrical-Engineering   
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Answer #1

A fibre optic cable light source is used to inject light into the fibre optic cable. They are two types: LEDs and Lasers.

The main advantages of LEDs is a low cost, easy to use,

The disadvantage is slower speed, lower power output than lasers, they’re difficult to couple into fibres. They have less bandwidth than lasers. The maximum speed is 1 Gbps.

Laser diodes have a higher cost and faster speed. Lasers can achieve speeds beyond 10 Gbps.

Explanation:-

Lasers only - is a wrong option because LEDs are also used as sources.

Lasers and LED's - This is the right option because both LEDs and lasers are used as sources.

LED's only - is a wrong option because Lasers also used as sorces.

Refracted natural light sources - is a wrong option because this type of sources are not used as sources in fiber optic cables.

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