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#Post#: 21--------------------------------------------------
What Exactly Are Fiber Optic Attenuators
By: AnnieHunter Date: August 16, 2018, 4:48 am
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A fiber optic attenuator, also called an optical attenuator,
simulates losing the could be caused by a long period of fiber.
Typically, this device performs receiver testing. While an
optical attenuator can simulate the optical loss of an extended
period of fiber, it can’t accurately simulate the dispersion
that would be caused by a long length of fiber.
Put it simply, for a fiber optic receiver, too much light can
overload it and degrade the bit error ratio. In order to achieve
the best bit error ratio (BER), the light power should be
reduced. Fiber optic attenuators fit the requirement perfectly.
This could happen when the transmitter delivers too much power
for example once the transmitter is simply too near to the
receiver.
How Does a Fiber Attenuator Work?
Attenuators are like your sunglasses, which absorbs the extra
light energy and protect your eyes from being dazzled.
Attenuators normally have a working wavelength range in which
they absorb the sunshine energy equally.
An essential characteristic of a good fiber attenuator is that
they should not reflect the light, instead, they should absorb
the extra light without being damaged. Because the light power
used in fiber optic communications are fairly low, they usually
could be absorbed without noticeable damage to the attenuator
itself.
Types of Optical Attenuators
Two types of fiber optic attenuators exist: fixed value
attenuators and variable optical attenuators.
Fixed value attenuators have fixed values that are specified by
decibels. Their applications include telecommunication networks,
optical fiber test facility, Lan(LAN) and CATV systems. For
instance, a -3dB attenuator should reduce concentration of the
output by 3 dB(50%). Fixed value attenuator’s attenuation value
can’t be varied. The attenuation is expressed in dB. The
operating wavelength for optical attenuators ought to be
specified for that rated attenuation, because optical
attenuation of a material varies with wavelength. Fixed value
attenuators are comprised of two big groups: In-line type and
connector type. In-line type appears like an ordinary fiber
patch cable; it has a fiber cable terminated with two connectors
which you’ll specify types. Connector type attenuator looks like
a bulk head fiber connector, it has a male end and a female end.
It mates to regular connectors of the identical type for example
FC, ST, SC and LC.
Variable optical attenuators come with a variety of designs.
They’re general used for testing and measurement, but they also
possess a wide usage in EDFAs for equalizing the sunshine power
among different channels. One type of variable optical
attenuator is made on the D-shaped fiber as a type of evanescent
field device. If your bulk external material, whose refractive
index is larger compared to mode effective index, replaces a
part of the evanescent field reachable cladding, the mode can
become leaky plus some from the optical power could be radiated.
If the index from the external material could be changed with a
controllable mean, with the effects for example thermo-optic,
electro-optic, or acoustic-optic, a device with controllable
attenuation is achievable.
Other types of variable optical attenuators include air gap,
clip-on, 3-step and more.
Source: 10Gtekstore.
HTML http://www.10gtek.com/
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