Fiber Optics Training, Electronic Security Networking Technician (ESNT) and IP Networking Security Training Classes and Manuals

COURSE DEMO Page 10 of 12

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THREE DISTINCT LAYERS:

Core - Carries the light signal

Cladding - Different grade of glass than the core, keeps the light signal within the core

Buffer Coating - Plastic, provides strength and size

The speed of light through optical glass is slower than the speed of light through a vacuum. The speed of light in optical fiber is expressed as the “index of refraction”. Index of refraction values for optical fiber vary between 1.40 and 1.59. The lower the index of refraction, the faster the speed of light in that particular composition of glass. Both the core and the cladding are made of optical glass, however, the “index of refraction” of the core is lower than that of the cladding. It is this difference in refractive indexes which causes the light signals to stay within the core, providing that the fiber strand is not bent severely.

LESSON REVIEW

Key Points:

1. Fiber is smaller, lighter, and easier to install than comparative copper cabling.

2. Fiber can carry multiple signals on a single strand of glass.

3. Fiber is made of glass and will not corrode over time.

4. Fiber systems can be easily upgraded by changing the optoelectronic devices.

5. A single fiber can carry signals bi-directionally at the same time.

Pop Quiz:
True or False

A maximum of six CCTV cameras can be connected to a single fiber strand.