This document compares simplex and duplex fiber optic cables, highlighting their structural differences and applications. Simplex cables consist of one strand for one-way data transfer, while duplex cables have two strands for bidirectional data transfer. The document also discusses the types of fiber used, their performance in different scenarios, and the advantages of each cable type.

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Fiber optic cable is a crucial component in the fiber optic network. There are many types of fiber optic
cable, such as single-mode fiber optic cable, multi-mode fiber optic cable, simplex fiber optic
cable, duplex fiber optic cable, and more. This paper will focus on the difference between simplex and
duplex fiber optic cables.
Simplex VS. Duplex Fiber Optic Cables
Fiber optic cables come in numerous types that are manufactured to achieve the unique goals of
the application. Let's take look at the main differences between simplex and duplex fiber optic
cable types.
Structure
A simplex fiber optic cable consists of one single strand of glass of plastic fiber and one single
outer jacket. A duplex fiber optic cable consists of two strands of glass or plastic fiber, and it can
be regarded as two simplex cables with their jackets conjoined by a strip of jacket material ,

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usually in a zip-cord construction format. Simplex and duplex fiber optic cables are both made up
of tight-buffered fiber, aramid yarn strength member, and jacket.
Applications
Simplex fiber offers a one-way data transfer. It’s a good choice for an application such as digital
data readouts, interstate highway sensor relays, automated speed, boundary sensors, oil line
monitors, fiber pigtails, fiber patch cords and pigtails, and indoor applications.Fiber optic duplex
offers bidirectional data transfer. It’s a good choice for applications such as telecommunications,
workstations, ethernet switches, fiber switches and servers, fiber modems, fiber patch cords and
pigtails, and indoor applications.
Single-Mode and Multi-Mode Fiber
Simplex and duplex fiber cables are available in single-mode and multi-mode fiber. Single-mode
fiber is often better for long-distance applications because it carries one ray of light at a time.
Multi-mode fiber has a larger diameter core and can transmit more data at a given time. However,
it is better for shorter distances due to high dispersion and attenuation rates.
In addition, duplex fiber optic cables can be half-duplex and full-duplex. Half-duplex means that
data can be transmitted in two directions but not simultaneously. Full-duplex means that data
transfer can occur in both directions at once.

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Advantages
Simplex fiber optic cable uses only single one strand of fiber in one-way transmission mode, while
duplex fiber optic cable uses a pair of fibers in bi-directional transmission mode. Duplex fiber
optic cable is more expensive than Simplex fiber optic cable because it uses more materials. Also,
simplex fiber optic cable provides high speed than duplex fiber optic cable.
Conclusion
Simplex and duplex fiber cables provide a high-quality tight buffered or loose tube, aramid yarn
strength member, and jacket, soft and easy to strip, round structure, and convenient installation
and simple operation. Sun Telecom is specialized in providing solutions and simplex and duplex
fiber optic cable products for global markets.