Page 172 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Fiber Optic Cable Type:
Simplex

Simplex cables are fiber optic cables with a single optical fiber. They are used in applications that only require
one-way data transfer.

Duplex

Duplex cables are fiber optic cables with two optical fibers. They are usually set up side-by-side and can be used
for applications that require simultaneous, bi-directional data transfer. Duplex fiber is availabl single mode and
multimode.

Encoding data of optical fiber
Encoding data into light is generally called modulation. Common parameters of light that are modulated are
amplitude, phase, frequency/wavelength and polarization states. For most business applications it is usually a
combination of these.
Data encoding is a process that involves converting data into a new format using a scheme. Encoding is a
reversible process.
Fiber-optic telecommunication systems use pulse-code modulation. Information is transmitted as a series of
pulses. The digital pulse-code-modulated signal is coupled into a fiber.

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CITS : E & H - Electronics Mechanic - Lesson 94 - 99