turowicz-7.ppt

7/25/2019 turowicz-7.ppt

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Fiber Optic MeasurementFiber Optic Measurement

TechniqueTechnique

Piotr TurowiczPiotr TurowiczPoznan Supercomputing and Networking CenterPoznan Supercomputing and Networking Center

piotrekpiotrek@@man.poznan.plman.poznan.pl

Training SessionTraining Session

KievKiev

9-1 !cto"er #$9-1 !cto"er #$

.

http://www.porta-optica.orghttp://www.porta-optica.org


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Testing and Measuring

Testing a cabling infrastructure is important to:

Identify faults or help in trouble shooting

Determine the system uality and its compliance to !tandard

"llow recording performance of the cabling at time #ero

Testing $% cabling is an indirect process

&easurement of lin' length and loss

(ompare with )alues calculated at design time*wor'manship uality+

(ompare with !tandard defined )alues *lin' functionality+


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,

Power budget

(alculation of theoretical insertion loss at nm

Components

$iber /12 .2 'm at ,.d0 *1.d0+ .

(onnector , pcs. at .d0 1.

!plice 1 pcs. at .1d0 .1

Total attenuation 2.3

(onnection !plice (onnection (onnection

m1 m, m

PMD

PMD


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LIGHT tracer

4 red light source and launching fiber

Power meter

4 measuring tools for light power loss

OTDR

4 graphical display of channel/lin' losses5 location5 beha)ior

FO ie!d testers "measuring too!s#


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$ttenuation measurement

princip!es

OTDR

%ac&scatter measuring "OTDR#

Power measuring

Recei'erTransmitter

Recei'er

P!ug

Transmitter

P!ug

OTDR

P!ugP!ug


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Power meter measurement

(ome basic ru!esLight source

7aser only for singlemode fiber. 78D for multi- and singlemode fibers.

9( to 9( and "9( to "9( connectors on test euipment.

Do not disconnect launch cord after reference.

heat up; the source before using *1 min.+

Power Meter

Detector is )ery large and is not measured

Mode i!ter

$or reliable measurements the use of a mode filter on the launch cord is essential.

C!eaning

8ach connector should be cleaned before testing/application.


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Power measurement )!e'e! setting

*+ Reerence measuring

Transmitter

Test cab!e *

"d


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Power measurement )

!in& e'a!uation

Transmitter

,+ Measuring the s-stem.s attenuation

Recei'er

FO (-stem

Tota! attenuation /d%0

850nm 0.74dBm

nm850

0.74dBm

nm850


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1rror reduction )

the Mandre! wrap princip!e

m mandrel 1 mm

for , mm


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Optica! Time Domain Re!ectometer

"OTDR# b!oc& diagram

t

Measuringde!a-

Recei'er 1'a!uation

Impu!s

generator

Light

source

%eam

sp!itter

optica! signa!s

e!ectric signa!s

FO


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OTDR measuring )

princip!e o operation

OTDR

The reflected light pulse is detected by the %TDA.

The light pulse is partly reflected by an interfering effect.

OTDR

" light pulse propagates in an optical wa)eguide.

OTDR


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1'ent dead 2one in an OTD


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1,

$ttenuation dead 2one in an

OTDR


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Measuring with OTDR

*# !aunching iber ,# !aunching iber

2 m - m for && 2 m 4 m for &&

m - 1B m for !& m - 1B m for !&

$% system under test1+ 2+

Testing set up


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1rrors detected b- OTDR

Connection or mech+3usion sp!ice

Fiber

&icrobending

air gap

lateral off-set

different type of fibercontamination

Fiber

&acrobending


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Optica! Time Domain

Re!ectometer

Aelati)epower

Distance


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$n e4amp!e o an OTDR

wa'eorm


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D-namic ratio in an OTDR


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Other FO measueremnts

Chromatic Dispersion.

Po!arisation Mode Dispersion

%nly for !inglemode application

(hannel length C 2 'm


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15FO 1quipement


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15FO 1quipement

%roadband source "C6L# or

CD3PMD

7ideomicroscope


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CD too!


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CD resu!t

http://www.porta-optica.orghttp://www.porta-optica.org


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23http://www.porta-optica.orghttp://www.porta-optica.org

Reich!e 8 De9Massari

Reerences

Documents

turowicz-7.ppt