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#Post#: 8--------------------------------------------------
Discussion Based On The OTDR Technology Of Fiber Optic Test Meth
od
By: AnnieHunter Date: August 7, 2018, 1:48 am
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Optical fiber communication based totally on light waves for the
provider to the optical fiber as the transmission medium of
conversation. Optical fiber communication transmission distance
and capacity of data and verbal exchange pleasant
characteristics and become the primary method of facts
transmission, is the cornerstone of the "information
superhighway". The fiber optic testing era is one of the most
broadly used in fiber optic programs, the most primary technical
expertise. OTDR is the principle device in the discipline of
fiber-optic test, it is broadly used in optical fiber cable line
upkeep, construction, and fiber duration, the transmission
attenuation of the fiber connector attenuation and fault place
measurements. The OTDR has a short test time, take a look at
pace, excessive precision test.
OTDR (Optical Time Domain Reflectometer, Optical Time Domain
Reflectometer) is the backscatter generated by means of the
Rayleigh scattering and Fresnel mirrored image inside the use of
mild pulses in optical fibers made ​​of high-tech,
high-precision photoelectric integrationinstrument.
Semiconductor light source (LED or LD) output mild pulse within
the modulation of the power circuit, the directional optical
coupler and sports connector into the measured optical fiber
cable line into the incident pulse. Incident light pulse
transmission line along the Rayleigh scattering of mild and
Fresnel meditated light, most of the Rayleigh scattered light
can be refracted into the cladding attenuation, opposite to the
course of propagation of mild pulses again to Rayleigh
scattering light along the optical fiber transmission line into
the optical port, the directional coupler splitter fired on the
photodetector into an electrical sign, low noise amplification
and the wide variety average remedy can be processed alerts from
the mild supply the lower back of the emission cause sign is
extracted via synchronous scanning come to be a reflected mild
pulse on the oscilloscope. Useful data again by way of the OTDR
detector to measure them as a time or curve fragments in
extraordinary places on the measured fiber. According to
transmit indicators to the time of the go back signal, after
which decide the velocity of mild in the quartz cloth, you may
calculate the gap.
Test wavelength choice
OTDR for fiber optic communications offerings, before making
optical fiber take a look at first pick a test wavelength
unmarried-mode fiber to pick out best 1 310 nm or 550 nm. 1 at
550 nm wavelength on the fiber bending loss is much more touchy
than the 1 310 nm wavelength, regardless of fiber optic cable
line construction or fiber optic cable line protection or test,
teaching, the usage of an OTDR to the whole of a cable or a
fiber optic transmission hyperlink The fiber optic sign
backscatter curve trying out, choice of greater than 1 550 nm
wavelength. 310nm and 550 nm, the wavelength of the take a look
at shape of the curve is the same, the measured optical fiber
splice loss values ​​are essentially the equal. 1
550 nm wavelength trying out found no problems, then the 1 310
nm wavelength dimension is truly no hassle. Select the 1 550 nm
wavelength checking out fiber complete smooth to discover
whether or not there's immoderate bending of the situation. If
it's far discovered someplace at the curve have a more loss
steps, after which the 1 310 nm wavelength retest, 1 310 nm
wavelength loss steps disappear, indicating that there does
exist a bend excessively, you need to discover and put off. 1
310 nm wavelength loss steps are the equal, wherein fiber might
also produce other issues, additionally want to appearance to
exclude. In the single-mode fiber line take a look at, you
should try to use the 1 550 nm, in order that test effects will
be better.
The refractive index of fiber alternatives
Now use single-mode fiber refractive index within the range of
1.460 zero 1.480 0. To accurately decided on in line with the
actual price supplied by means of the producer of fiber optic
cable or fiber. For G. 652 single-mode fiber, the real check
with a wavelength of 310 nm, the refractive index is typically
choose 0 1.468; if 1 550 nm wavelength, the refractive index is
typically pick out to 1.468 five. The refractive index pick not
allowed to affect the test period. In refractive index mistakes
of 0.001 (1), 50 000 m relay segment will generate the error of
about 35 m. Cable renovation and troubleshooting of small errors
would deliver substantial error, the test ought to be taken
significantly sufficient.
Three commonplace techniques of implementation of the OTDR
checking out
OTDR fiber optic cable and fiber optic take a look at season
checking out events, inclusive of the preservation tests and
periodic trying out of the development take a look at for
factory testing of fiber optic cable and optical fiber, optical
cable and fiber optic cable, fiber optic cable and optical
fiber.
The OTDR forward one-way take a look at technique
OTDR check the path of the optical fiber splice connector point,
check devices and testers are always beforehand of the switch of
construction cars. Use this technique to monitor, take a look at
factors and splices is continually simplest one cable period,
the accuracy of the test connector attenuation, and to
facilitate communications and liaison. A cable duration of
approximately 2 to a few km, using walkie-talkie in the
wellknown topography can make sure that communication
hyperlinks. If the fiber optic cable corrugated metal protecting
layer can also use the magnet telephone touch.
The drawback of this check approach is glaringly an OTDR to move
to every take a look at point time and labor, and now not
conducive to the protection of the instrument; take a look at
factor to the terrain, in particular the line faraway from the
street, greater cumbersome in complicated terrain. Selection of
transportable OTDR monitoring at close variety to check the
instrument dynamic range of less demanding, and small 0TDR
quantity small, mild weight and easy to move, this may
substantially reduce the workload of testers, to enhance take a
look at velocity and performance.
More product records please visit 10Gtekstore.
HTML https://www.sfpcables.com/100g-qsfp28-transceivers
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