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Fiberstore (FS.COM) | End User’s Guide to Fiber Optics
Subscribers are often complaint about not finding any information about fiber optics aimed
specifically at them. Because most materials about fiber optics is written to train optical technicians,
people who have no experience in telecommunication can not understand these industry standards.
So they have to ask an optical technician for help every time they met a problem or even a tiny error.
Today’s article has provided detailed information so that end users can find answers to their
questions on fiber optics.
What Is Fiber Optics?
Fiber optics is the primary the medium we use to communicate today. For instance, Phones,
landline or wireless, the Internet and cable TV all communicate on fiber optic cables. Fiber optics
carries signals as pulses of light while copper cables carry signals as pulses of electrons. Fiber's
advantages over copper result from the physics of transmitting with photons instead of electrons. In
glass, optical attenuation is much less than the attenuation of electrical signals in copper and much
less dependent on signal frequency.
We all know that fiber optic transmission is susceptible to interference, making it the only choice for
secure communications. Unlike copper wires that radiate signals capable of interfering with other
electronic equipment, fiber is totally benign. Utility companies even run power lines with fibers
imbedded in the wires for both communications and network management! Although with today's
applications, multimode fiber is used at 100-1000 Mb/s for datacom applications and is capable up
to 10 Gb/s. Single-mode fiber offers virtually unlimited bandwidth, especially with DWDM. SC FC
patch cord is one type of the fiber patch cord with SC connector on the one end and FC connector
on the other end.
End User’s Guide to
Fiber Optics

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Fiberstore (FS.COM) | End User’s Guide to Fiber Optics
Understanding Fiber Optic Communications
Fiber optic links are the communications pathways between devices. A link is bidirectional, usually
with signals transmitted in two directions on two different fibers. The link has a transmitter that
converts electronic signals from communications equipment to optics and a receiver that converts
the signal back to electronics at the other end.
Fiber optic transmitters use LEDs or semiconductor lasers to convert electronic signals to optical
signals. LEDs, similar to those used everywhere for indicators, except transmitting in the infrared
region beyond human perception are used for slower links, up to about 100 Mb/s. Faster links use
infrared semiconductor lasers because they have more bandwidth, up to tens of billions of bits per
second (Gb/s). Lasers have more power, so they can also go longer lengths, as in outside plant
applications such as long distance telecommunication or CATV.
Since the light being transmitted through the optical fiber is beyond the range of human sight, you
cannot look at the end of a fiber and tell if light is present. However, some links carry high power,
looking at the end of the fiber, especially with a microscope which concentrates all the light into the
eye, can be dangerous. Therefore, before examining a fiber visually, always check with a power
meter to insure no light is present unless you know the far end of the fiber is disconnected and use
a microscope equipped with a laser filter.
At the receiver end, a photodiode converts light into electrical current. Photodiodes must be
matched to the transmitter type, wavelength, power level and bit rate as well as the fiber size to
optimize performance. It's the receiver that ultimately determines the performance of the link, as it
needs adequate power to receive data reliably. Receivers have a certain amount of internal noise
which can interfere with reception if the signal is low, so the power of the optical signal at the
receiver must be at a minimal level.
The power at the receiver is determined by the amount of light coupled into the fiber by the
transmitter diminished by the loss in the fiber optic cable plant. The installer will test the cable plant
for loss after construction, comparing it to a loss calculated from typical component values called

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Fiberstore (FS.COM) | End User’s Guide to Fiber Optics
the "loss budget." Transmitter power can be measured when the networking equipment is installed
using a patch cord attached to the transmitter. The following above shows a SC fiber patch cord.
Recommendation On Cabling Selection
Today, we're seeing cabling connectivity, designed to carry gigabit and 10 gigabit traffic with 850nm
VCSEL transmitters, moving toward standardization on 50/125 laser-optimized fiber. If you are
planning, designing, installing or using high speed premises fiber optic networks, it appears you
should be recommending and using OM3 or OM4 fiber and LC connectors. One big advantage of
using a full OM3 or OM4 cabling standard is that it is easily identifiable by the aqua color and
cannot be interconnected with legacy cabling.
This short guide is designed to help end users pondering the choices when planning an installation
and provide links to more in-depth information. If you have any other opinions about this topics,
you are welcome to share with us.

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Fiberstore (FS.COM) | End User’s Guide to Fiber Optics
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Tel: +44 2081441980
Notice: This document is for informational purposes only and does not set forth any warranty, expressed or
implied, concerning any equipment, equipment features, or service offered or to be offered by Fiberstore.
Fiberstore reserves the right to make changes to this document at any time, without notice, and assumes no
responsibility for its use. This information document describes features that may not be currently available.
Contact a Fiberstore sales team for information on feature and product availability.
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