Wandel & Goltermann OLA-25 Manual

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Contents oLA-25
2 General
information
-
preparing
for
use ."........2-1
Introduction
1 Specifications .....".."....."1-1 Description
and
Operating
Manual
oLA-25
OpticalAttenuator
(variable)
BN
2200,
series
A"..
Order
No.
BN
2200100.82
Edition
4031/11.90
(3935)
subecl 10 change wilhoul nolce
Our normal c!ara.:ee and Oeirvery
lerms acpiy
Pr.red in th€ Fede:arFepubrc or Gemany
a wände 6Golefmann GmcH&Co Eil,ngenu
A r990
I 9 89 h!b 7rlsl
Wandel
&
Goltermann
Electron
rc
fr4easu
rement
Tech
rrclcgy
OperatingManual
INTRODUCTION
The
OLA-25isa continuously
variableoptical
attenuator
designed
forattenuating
optical
signals
carriedby single-mode
tibers
(9/125
Äm)
operating
at
1300
and1550
nm.
The
attenuator
module
isa neutral
densityfilter
placed
inthebroadened
lightbeam
between
theinput
and
outputconnections.
Theattenuationvalue
isvariable
between
3and 60dBand
dependsonthe
position
of
thefilter,
which
is
setusing
therotarycontrol
onthe
front
oanel.
The
actuaiattenuation
includesthelosses
of bothtest
ports.
ltis
displayed
with
a resolutionof0.
1dBonthe
LCdisplay.
The
display
errorremains
at < + 0.2 dB.
Thisaccuracy
is
obtained
byindividual
calibration
of
thedisplay
to match
theattenuationfilter
characteristic.
The
OLA-25is
factory
calibrated
at 1300
and1550nm.
ltis
set
tothecorresponding
nominal
wavelength
usingthe
siideswitch.
l1
1.2
1.3
1.4
t.o
1.7
2.1
2.1.1
2.1.2
2.1.3
2.2
2.2"1
2.2.2
2.3
Test
ports ..............."..2-1
Fitting
thetest
adapters.
".
".........
"..2-2
Cleaningthetest
ports
............".."..2-4
Connector
life
..............
........".........2
-g
Power
supply ...."...."2-10
Batteryoperation ....2-1O
ACline
operationandbattery
recharging
with
theLNT-1....".....2-13
EMI/RFl
suppression..............."..2-1
5
Specifications
1 Specifications
1.1 Wavelength
Useful
range ...............1250
to1600
nm
Calibrated
at ..,.......................
........1300and
1550nm
1.2 Attenuation
Nominalrange............. ..."..... 3
to
60
dB
Insertionloss................. ..............
< 3
dB
Setting
............ continuouslyvariableover
entire
range(10
turns)
1l
Return
loss .......>23
dB
Max.
tolerableinpullevel ........
r 3dBm
1t
'i ValidlorDINconnector
(BN
2060/00.30)
andwhen
W&GseriesK
31
xxcablesareused.
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Contents
e
Overview ."........."""...""
g-s
I
nstrument
settings
......."...
"".......
"..
3-6
Switching
on,
auto-off
and
permanent
operation
............
3-6
Settingthe
wavelength
and
attenuationvalues
.."....,
......"3_7
3.2.2.1 Setting
the
wavelength
............
....
3-Z
3.2.2.2 Setting
the
attenuation
.........."..""..
3,g
3.3 Looping
theOl-A-25into
atest
circuit ............3-10
3.3.2 Connection
usingtest
adapters
(2.5
mm
connectors)
....".............
3-j2
3.3.3 Connection
usingW&G
K31
XX
adapter
cables
."............".
3-1
4
3.3.4 Testexamp|e,.............................3-16
Further
information
...................
".
"....4-1
Address
lnternationalSales
andService
Headoffice
Wandel&
Goiiermann
GmbH
&
Co
Postfach1262
D-7412Enii-rgenu.A.
Federal
Recubiic
ofGermany
Tel.,-49-712i-86-0
llx.729
833wug
d
FAX
+49-71
21-88404.
Operating
Manual
Q1
3.2
3.?_.1
3.2.2
4.1
4.2
4.3
Displayed
optical
attenuation
......4-1
Return
loss............ ."."4-4
Light
attenuation
atnon-
cafibratedwavelengths
..............".
4-T
Specifications
1.3 Errorlimils The
OLA-25
isloopedinto
thetestcircuit
usingtest
adapters,
availableforallstandard
2.5
mm connector
systems(DlN,
FC,
ST,
etc.).
Adaptercablescanbe
used
ifdiflerent
connectors
arerequired.
Thetest
ports
are
physical
contact
(PC)
types.This,
together
with
theanti-reflex
coatedcomponentsinthe
attenuatormodule,
guarantees
a constanthigh
return
loss
of < 23dB.
In
normaloperation
thedisplay
oi theOLA-25is
battery-powered.
lftheattenuationcanbereaddirectly
fromabiterror
tester
oroplical
power
level
meterinthetest
circuit,
the
display
canbeswitched
off,asthe
OLA-25
still
functions
asanattenuator
inthismode.
Operating
error
Display"rror3) ,........
+ O.2
dB 1'O.2%
of displayed
value
+ 0.1
dB
Attenuation
setting
repeatability
3) .....
1)
"\
Valid
tor DIN
connector
(BN
2060/00.30)
and
when
W&G
seriesK31 xxcablesareused.
Including
connector
losses
over
nominalrange
of
use.
Thetotal
errorisincreasedbytypically
+ 0.3
dBwhenotherconnectors
(FC,
ST,
HMS-10)
areused.
Excluding
connectorlosses.
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otA 25 Speciiications
Ambienttemperature
Nominalrangeofuse......
.
Storage
andtransport...,"..
Humidity
-10'C
to
+50'C
-40"
Cto r 70' C
< +'40"
C (relative
humidity) .5to
95
%
> +
40'C (absolute
humidity) < 30
g/m3
Size
(wxh xd in
mm).................."..."......98x170x55
Weight..."....... approx.
900
g
Ordering
information
OLÄ-25Optical
Attenuator 8N 2200/01
Tooperate
theOLA-25,twotestadapters
arerequired
whichcorrespondtothetype
ofconnectorsystem
used.
Testadapter
"fiber
tofiber"connection
(at
extracost)
DrN
47256 BN2060/00.30
NTT
(FC-PC) BN2060/00.31
ST
typeAT
&T ............ .BN 2060/00.32
HMS-10/A
(SMA
connection)...............
BN2060/00.34
HMS-1
0 (screw
connection
orBNC
plus)
............... .8N
2060/00"3s
*) withort testadapter
General Information
General
information
-
preparing
foruse
,/i\
./!\ Safety
instructions
The
OLA-25is
a passive
optical
attenuator.
The
instrumentpresents
nodanqerfromoptical
radiation
However,when
connecting
theOLA-25intoasystem
which
isin
operation,
itshould
be
noted
that
laser
radiation
isthen
accessible.
Observetherelevant
regulations
onprotection
when
usinglasers.
^
/t\Wear&Tear
The
OLA-25isdesigned
iorfield
use
andis
ableto
cope
withthe
wear
andtear
ofeveryday
use.Due
to
thewayinwhich
theOLA-25
isconstructed,
the
proportion
of
precision
optical
components
is
higher
thaninother
field
equipment
which
makes
jt
more
subiect
towear
andtear.The
instrument
shouid
therefore
behandled
withcare
and
protected
lrom
misuse.
cLÄ-25 Specilication!
1.4 Test
ports
Fiber
type single-modeIiber
9i12.3
1m
internalconnector
type......2.5mm (physical
contadl
Test edapters
for
directly
connecting
various
2.5mm connectors
.,......"......D1N,FC-PC,
ST.IJMS-10
Adapter
cables
Reference
cable
(9/125
pm);
oneend
completed
withDINconnector,
other
endchoice
from
............DlN,
FC-PC,
HMS-O,
-10
Lens,h .lllli"llliil
l:ifl
Display
Type
.............. ......."...3digit
LCDisplay
Displayvalue ......absolute
attenuarron
.....
(incl.
connector
loss)
Resolution ...,......0.1
dB
-::t::::::::::::::::::l::t,li,j;::l
Specifications
LNT-1
AC
Line
Adapter/Charger
..............
BN2068/0l
withline
cordand
2chargercables.
Please
specifytypeof line
cordrequired:
Line
cordwith European
plug
..................
K49O
US
plug .."..
K491
UK
plug ....K492
Australian
plug
...................
K493
MK-1
equipmentcaseto hold1 x OLA-25, BN
2090/05
1x LNT-1,
opticalcables
etc.
MK-4
equipment
case
lo hold
3instruments...2092/1 1
in
the OLS-/OLP-/OLÄ-25range,
2x LNT-1,
cables
andtestadapters.
't.7
1.5
2
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S€ifiqtions
Accoalorl€t (charged oxtra) **\
Adapt€r-
andconnectorcables(9/125
rrm) r,
frorn
DIN47256@nn€ctorto
DtN47256....... .................""...
.K3100
FC
typeNTT
{PC
version) ..,K3101
RadiallVFO ."
K3102
DiamondHMS-0
(3.5
mm) ...........................
K3104
WECO
2016A
(biconic) .........K310s
DiamondHMS-10
(2.5
mm) .K3106
Pigtail."......"... ......".............."..
K319S
Shoulder
strap..........".... ..BN
820/0O.S2
NiCd
battery ..........."........8N
820/0O.sO
' TheDINtestadaptorBN206O/m.3O
isrequired
in
order
to connectth6adaoter
cables.
Secificalions c)t_A-25
.|.6 Generalspecitications
Powersupply
Built-in,exchangeable
drybattery .-..".......""......9
V,IEC
6LF22
orNiCdbattery................"....."............e.9.Varta
TR
7/B
A.C.
power
.....",.....separate
a.c.
line
adapter/charger
Operating
time
withdrybattery......"..." ....."approx.45h
with
NiCdbattery........... ...approx.10h
Auto-oftatter15minutes,orpermanent
operation.
\Mren
workingwithfixedattenuation
values
the
instrumentcanbeleftswitchedoff .
EMI/RFIsuppression.....toDBPregulation1046/1984
or
CISPR
Publ"
11,
Cenelec
HD
344
otA-23
1-6
General lntormalion
2.1 Test
ports
2.1.1 Fittingthetest
adapters
FornormaloperationtheOLA-25 mustbecompleted
with BN206O/0O.)C(testadapters,in orderto beable
to connect thefiberopticsconnectorortost
cable
on
thesyslomside.Thetestadaptersareusually
suppliedwith
theinstrumenl
as
anunassembled
accessory.
Afterremovingboth
dustcapsfromtheOLÄ-25, the
internaltestconn€ctions
(2.5
mm connector
pins)
are
acc€ssible.Further
dust capsto protscl thesesensitive
conn€ctor
pins
shouldalso
bepulled ofl,sae
Figure
2-1.
Thet€stadapterscan now be litted.
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oLA-25 Generai information
2-1.3 Connectorlife
The
insertionloss
ofanoptical
connector
dependson
themechanical
tolerances
ofthemating
surfacesas
well
asthedegree
o{cleanness.
Thetolerances
may
deterioratein
relationto
thenumber
oftimes
thatthe
connectoris
used
(plug/unplug
cycles).
Thehard
metalversion
oftheconnectorpin
andtestadapter
(centering
sleeve)
guarantees
a long
andreliablelife.lf
careistaken
(regular
cleaning)more
than
10O0
plug/unplug
cycles
canbeexpected
withouta
changeinattenuation.
Thelifeoftheconnections
to the OLA-25canbe
extended
byleaving
theadapter
cable
whichisused
for
the
measurement
plugged
in.
TheMK-1
equipment
case
islaid
outtoaccommodate
thisconfiouralion.
General informa!io.r
Note:
- Vvhen
screwingthetestadapter
into place,
make
sure
that
theinternalcentering
sleeveis
correctly
positioned.
ll necessary
twistitsiightly
sothatthe
saletycatchclicks.
- After
screwing
inthetest
adapter,replacethedust
capswhich
are
permanently
attachedto the
housing.
'fhisprotects
thesurface
oftheconnector
pin
fromdust.
(Loose
dustcapsarenolonger
used).
" Duringassemblytake
carenottotouchthe
connector
oinsurfacessothat thefiberendfaces
arenotexposed
to dirtorscratched.
Figure2-1 OLA-25test
port
a)
without
testadapter
b)
withtestadapterinplace
z-5
General Informalion
a)
The
test
ports
should
becleaned
before
every
use
o{
theinstrument.
Usethefollowingprocedure:
- Unscrew
the
testadapter
fromthe
test
ports.
The
fiberend
suriaces
of
the
plug
pins
are
now
easilv
accessible
(see
Figure
2-1a).
- Moisten
alinffree
tissue
wiih
isopropyl
alcohol
and
wipethe
surfaces
ofthetest ports.
- Wipe
again
using
a dry
tissue.
- Lightly
press
apiece
ofadhesive
tape(e.g.
Scotch
Magic
Tape
orsimilar
weakadhesive
tape)
onto
thesurfaces
oftheports.
Remove
thetape.
The
cleaned
surface(125
pm
zone)
should
look
like
Figure
2-2b.
. Blow
any
dust
offusing
clean
compressed
air.
General Informaliorl
z-3
Figure
2-2b Cleanendsurface (magni{ied
200
x)
2-9
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General lnform&lion
2.1.2 Cleaning
thetestports
The
OtA-25
isfitted
with
physical
conlacr
(PC)
ccnn€ctors(2.5
mm pin) whichguarante€
interference-free
operation
acrosstheenlire
temperaturerange.
Since
th€tiber
ends
areinphysical
ccntact
andthelight
spotdiameter
isa mere
0.009
mm,carefulhandling
oftheports
isnecessaryto
ensure
reliableoperation.
The
producers
outlined
below
shouidbeobserved.
Makesurethat
thedustcaps
arealways
fittedov€r
the
tsst
ports
whenth6instrument
isnotlooped
intoat6st
setup,asevensmall
dust
particles
ontheliberend
surfaces
can affectth6 attsnuation
valueorcause
damage(see
Figure
2-2a).
General Information
2.2 Power
supply
The
OLA-25
needs
nopower
supply
inorder
lo
function
as
anoptical
attenuator,
astheanenuator
module
istotally
mechanical.
However,
to display
thecurrent
attenualion
value
a LC
display
isneeded.
This
canbepowered
byanyofthe
foilowing:
- agVdrybattery
- a9Vrechargeable
battery
- ana.c.
line
adapter/charger
unit.
2.2.1 Battery
operation
One
9Vdry-
orrechargeable
battery
isrequired.
The
iollowing
types
aresuitable:
- Dry
battery:
IEC
6LF22
or6LR61,
operaring
Iife
approximatety
45
h;
(supplied
with
the
OLA_25
as
standard).
- Nifr rechargeabte
battery:
VARTA
or SAFT
type
TR7
/8 or
similar,
operating
lifeaoproximately
10hours.
Asuitable
battery
can
be
ordered
asan
accessory.
General lnformalio.i
fi7urc2-2a Dirtyendsurface
(magnilied20Ox)
2-6
General Intormation
\1^
1
t
f
J
,r{
2-1A 28
figure 2-2b Cleanend
surface(magnified
200x)
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cLÄ-25 General lnlo.malion
2.2.2 AC line
operation
andbattery
recharging
withthe LNT-1
Therecommendeda.c.
lineadaoter/charger
unlt,
LNT-I(BN 2068/01accessory),canalsobe usedio
rechargethe NiCd
batteryifoneisused.
Before
connectingupiheL.NT-1,makesure
thatthe
ioilowing
safetyrequirementsaremet:
,A
./
[
\ lmportant
Safety
class The
LNT-Iisa safetyclass
ll
instrumentasdefinedinVDE
0411
or
IEC
oublication348.
ACline
voltage
Makesurethattheoperatingvoltage
oftheLNT-1
andthe
a.c.linevoltage
correspono.
Temperature TheLNT-1isdesignedforindooruse,
and
can
be
operated
inambient
temperaturesbetween
0 and + 50"C
Ventilation Wheninuse,setuptheLNT-1so
that
sufficientventilationis
available.
Condensation Donotoperate
the LNT-1
if
condensation
hasformed.
z- tJ
General Infcrmatror
oLA,25
2.3 EMI/RFI
suppression
Theinstrumentcontorms
tothelollowing
regulations
governing
EMI/RFlsuppression:
Regulation
1046/1984oftheFederal
German
Postal
Authority
(DBP),
VDE
regulation
0871,Class
Blimitvalue,
CISPR
publication
11
(150
kHzto 1
GHz)
CENELECHD
344(CLC-CISPR
HD4)and
FCC
Rules,
Part15,
SubpartJ,Class
A
lfthisinstrumentisused
inconjunctionwithother
equipment,
thismustalso
conformto
the
above
requirementstoensureadequate
EMI/RFI
suppression.W&Ginstruments
conform
tothese
standardswhen
usedaspart ofasyslemaslongas
they
are
correctly
setupandthespecifiedconnecting
cablesare
used.
When
used
correctlywithotherequipment,these
regulationswill
alsobeconlormedwith.Pleaseensure
thatonly
therecommendedconnectingcables
and
connectors
areusedand
that
adeouate
screenino
is
provided
wherenecessary.
tfaW&G
instrumentshould
generale
EMI/RFI
rnspite
oftheabove
precautions,
we
will
be
hapoy
1ooffer
advrce.
Discharged
battery:
I If-li-l,rn ]
*l3rr lr_a,Llau
L_=____-J
Figure
2-4 Dischargedbattery
warning
Whenthebatterayvoltage
drops,thewarning
'BAT'
appears
ontheleft
inthedisplay.
The
OLA-25
switches
offautomatically
after15minutes.
Tochange
thebattery:
- Turnthe
instrument
upside
down.
- Push
theslideofthe battervcoverdownwardsand
remove
thecover,
- Pull
uptheplastic
tab andremove
theoldbattery.
- Fit
thenewbatteryinto
the
instrumentwiththe
contactstotheright,negative
pole
uppermost.
Thebatterywillnotfit unlessitiscorrectly
oositioned.Donotuseforce.
- Finallyreplacethecover,and
push
theslide
uowardstolock.
General lnformation
1100r/nm 1550
Fiaure 3.,]-l Fronc view of the 0LA-25
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General lnformalion General lnformation cLA,25
ACline operation:
- Connect
the
OLA-25
andtheLNT-1
usingthe
chargercable
provided:plug
theadapter/charger
jack
intothechargingsocketontherighthand
sideot the OLA-25.
- Plug
in
th€LNT-1
power
cord.
- Switch
ontheOLA-25
usingthegreen
ON/OFF
button;theattenuationdisplay appearswith
the
indication
'PERM'.
Charging
theNiCdbattery:
Connect
theOLA-25
to theLNT-Iasfora.c.line
operation.
Holddownthe
"ON/OFF'switch
onthe
OLA-25
until
thegreen
"CHARGE"
LED
lights.
Thechargingcycletak6s14hours;attheendof
this
period
chargingstopsautomatically.
hisalso
possible
tooperatetheOLA-25 whilst
chargingisin
progress.
Itisalso
possible
lo startthechargingcycleeveni{
adry batteryisfitted.Nocharging
current
willflow
iftheswitchin
thebatterycompartmentis
correctlyset.
llth6a.c.
power
linefails,chargingwillnot
continue.
The
cyclewillneedto berestarted.
Explanation
/N
/ \ lmportant
lfthe
drybattery
isused
to replace
a NiCd
battery
or
vice
versa,
makesurethatthe
switchlocated
inside
thebattery
compartmentiscorrectly
posrtioned
(see
Figure
2-5).lf itiswrongly
positioned
the
drybattery
rnaybedestroyed
ortheNiCd
battery
wiilnot
recharge.
.-
slide
switch
Figur€
2-5 Batterytypechangeover
switch
Please
disposeof used batteries
carefully.
Operalion
3 Operation
3.1 Overview
Symbol
Socket
fora.c.line
Adapter/charger
ontheside
ofthe
instrument
Threaded
bush
for
shoulder
straponthesideofthe
instrument
OLA-25op€rating instructlons
Prepare
testports:
see
section2.1
(cleaning,
selectingtestadapter)
LooptheOLA-25
into
thetestcircuit:
seesection
3.4
Switch
on:see
section
3.2.1
Setthe
requiredwavelength:
see
section
3.2.2.1
Set
theattenuation
value:see
section
3.2.2.2
0l{/0ff
(o)
Explanation
Dust
caps
Test
ports,
withtestadapters
screwedinto
place
(BN
2060/00.)C()
On/off switch
press
buttonbriefly
-
Auto-off
circuit
on
press
buttonlonger
(approx.
2seconds)
permanent
operation
mooe
press
button
longer
(approx.
4seconds)
recharging
battery
LED'CHARGE"lights
when
thebattery
isbeing charged
(see
ON/OFF
switch)
Operalion
3-3
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CFraliori Opeialio.l
3.2 Instrurnen:l
st,:,:,
3.2.1 Swltci':ing;ii.
operäiiei":
oLA-25
Press
theknob
in
lo lock
thesetting.
The
attenuation
value
isnot
atfected
byswitching
the
OLÄ-25off.
Th€
rotary
control
hasnoend-stop.
lftheupper
limit
(60
dB)isexceeded,
thedisplay
shows:
Note:
tf
thecontrol
is
turned
further
inaclockwise
direction
themaximum
att€nuation
value
isreached
andthe
attenuation
value
will
thenrapidty
decrease.
Thisis
dueto theway
theOLA-25isconstructed
andisof no
consequence
in
normal
operation.
lfthelower
limit
(3
dB)
isexceeded,
the
display
shows:
m
\=-_----._)
F:planation
Shows
attenuationsvalue
withthe
warningthatthe
baitery
isalmostdischarged
("BAT")
andthat
the
instrumentisin
permanent
operation
('PERM")
Rotarycontrol
to set
the
attenuationvalue
- Pull
knobupto selectthe
attenuation
value
- Pushknobinto lock
This
rotarycontroldoesnot
haveanend-stop.Whenthe
setting
limits
ofthe
attenuationvalueare
reached,thedisplay
shows
" LO;
lowerlimit
(< 3dB)
- Hl;upperlimit
(> 60 dB)
Wavelengthchangeover
switch
Ope ration
The
auto-offcircuit
isdisabledwhentheOLÄ-25 is
operated
usingana.c.
adapter/chargerunit(see
section2.2.2)"
lfthea.c.
power
supply
failsanda bafleryhasbeen
litted,ittakes
ov€rthepower supplyandthe
instrumentswitches
itselfoffautomaticallyafter
approximately1
5 minules.
3"2.2 Setting the wavelength
andattenuation
values
3.2.2.1 Settingthewavelength
The
slideswitch
(7)
isusedtosetthewavelengthof
1300
nm or 1550nm.
No.iSymbol_
The"öN,tCF:" i
l:,ii,:':i .i!-tü p€i"mailent
r
ir;r
rlt syrii.nes
ihe
OLA-25onand
Whenbafiei-j/
p,-:;..'e;eC,
liie CLÄ-25canbeoperated
in
either
auto-oif
o!'
permanent
operation
rnodes:
- Press
tirei:.:iir r..:l3ii\r witdn
sivitching
on
('PEFivi"
i: j:j ,irr
a:n,e:,lr;
i:re
display):
Theins:iruineni
:rr,'itihes
ofi automatically
aiter
approximatel)'
15
miniltes.
- Hold
ihebuficnsown
untii
'PERM"
apoearsin
the
dispiay
isee
Flgure
5-2).Ths
instrurnent
isthen
in
Jermancr,roc.:raiion
mcce.
,---\
_+! jF;l/l ,:- .-.t tffii I
I aeoi
".{rjHplti
, ,:t j i,i€"Lj;ä$l
i '1ri";:
riJ l
1
100 1550
I/m
tii:"::,ies
i,eitnailirnt operation
J-j
J-O
Operation
HI dB
3-9
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Oreralion OLA.25 Operation oLA.25
3.3 Looping
theOt-A-25
into
atestcircuir
3.3"1 General
information
Due
tothesymetrical
construction
oftheOLA-25
itis
possible
to operate
itinversely.
The
assigning
ofthe
lestports
asinput
and
output
as
shown
onthe
front
panet
canbe reversed
if required
bythe
test
configuration.
The
return
lc
the
reft-hand
test
port
-'.
;:'"?J;tr1y,
';,:ffi:
hand
test
port.
Setting
the
attsnuaiioix
Theattenuaiicn
iaigr is
:l
dts1c
60
dB
/I
,/
!\ tmportant
Thedisplayed
aiietuai:,:n
velus
alscincludesihe
losses
ofkro'ihccnnecr,:isoriine OLÄ-25;
s€e
section
4.1
.
The
OLA-25
canaisobeusedtoattenuatetheiight
level
forwaveien$thotherthan1
300
nmor1
550
nmin
the
range
BCo
nrntc',7iC nr:i.iiora/ever,thedisplayed
attenuation
vaiue;lee,Js;übeclrf!'gcted;seesection
{. J.
The
attenuatiorrissetcontinuouslyusingtherotary
control
(SET
AJTEN.),
Pulluptheknobtosetthe
attenuation.
' Toincreaseatienuationtui'nknob
clockwise
' Todecreaseai-tenuaricniurn
knobanticlockwise
Attenuation
can
be
setto
a
resolution
of
0.1
dB.
As
the
position
oi':he
atienilation
fiileriscontinuously
variabie,
itmayna1:9eninai'ihe
last
ciigitofthe
displayedvalueirin:i siabie.ifihisisaproblem, turn
thecontrol
slightly
uniilihedisplayisstable.
3.2.2.2
3-8
3-10
Operalion Operalion
Systemcables
9/125
pm
tromsystem / \ to system
transmitter / \ recerver
ll
tl
tl
XX
I iXX XX
=
Connector
A '0 (2'5
mm)
test
aaapters
@ @| ,* 2o6o/oo.xx
H,,^,,
Figure
3-4 Direct connection
ofsystem
cables
viatest
adapters
Left-handmnnector Righl-hand@nnector
.t I
\\o Q//
a) Standard
Conliguration
I
I rln
I
0R
rri i-i
77,v77'd INPUT
F---J ourPur f'-.?
rrn - 'out
I
0R
b) Alternative
Coniiguration
q---I our:ur*r,urrut
- @@
.OUI
P.n:lnputlevel
Pout:Outpullevel
Figure
3-3 Inputandoutputarereversible
J- {.1 3-11
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Operation
3.3.3 Connection
using
W&G
K 31)O(adapter
cables
lfihetransmission systemdoesnotuse
theslandard
2.5mm connector
system,
9/125pmadaptercables
from
theK31)C(
series
(accessory)
areavailable
to
matchnon-standard
conn€clorstotheOLA-25
(see
Figure
3-5).
These
cablesalwayshavetheDIN
connectorforconnectiontotheOLÄ-25
butthe
connector
tothesystemcanbeselected,
e.g.Biconic,
RadiallVFO,etc"
Duetotheir
goodtransmission
qualities,
the
W&G
K31X( adaoter
cablesaresuitable
toruseastest-or
referencecables;
thodisplayedattenualionvalueon
theOLA-25 also
includestheconnector
lossesofthe
DIN
connectors.
For
referencemeasurements
based
onthe DIN
conn€ctor,
cableversionsare
availablewhich
are
completed
withDlN,
FCandHM$10 connectors
(2.5
mm)onthesystemside.
Whentheadaptsrcablesareused,theOLA-25
must
befitted with BN2060/00.30
testadapters.
3-14
Cpefalion oLA.25
3.3.2 Connection
usingtest
adapters
{2"S
mm
eonnectors)
lftheuserhas
a2.5
rnmconneclor
syslem,
eables
from
thesysterncan
beconnectecl
diroctlyusingthe
corresponding
BN2060/0O.)C(tsst adapters(see
Figure
3-4).
The
OLÄ-25
shoutd
becompleted
withthe
right
test
adapters
(see
section
2.1.1).
At
present
test
adapters
areavailabletorthe
lollowing
types
of2.5
mm conn€ctor
0C():
r DtN
47256
* NTTFC.PC
" ST
typeAT&T
* HM$l0/A Diamond
(SMA
conn€ction)
i HM910 Diamond
(with
screwconnection
andBNC
plus)
3-12
Operation C)peratiorl
A Pror"",ion
fromlaserradiation
Toavoid
unnecessary
exposure
to laser
radiation
when
conn€cting
theOLA-25
to t€rminal
equipment
which
isinoperation,
the
following
procedure
should
beobserved:
- Connect
theOLA-25
tothereceiver
section
Rx2
using
cable
K, (ri9ht-hand
connectod'
- Connect
cable
K. totheleft-hand
connector
of the
oLA-25.
- Connect
thetreeendofcable
Kr tothetransmitter
section
Txl.
System K3lXX System
transmitter / \ receiver
-w-1
äw
orilI I o,*
AA
DtNadaprers
U ro BN2o6o/m.30
XX:
System
connector
type
oLA
-25
Figure
3-5 Connection
using
K
31)C(
seriesadapter
cables
(monomode
systems)
J-l/ J-lc
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Ogeration
0tÄ-25
Figure3-5a Testconiiguration
torsettingthebit
errorrate,e.g.usingPF-4lrom W&G
(with
thesystemcablesK| Kr)
ot^ 25
Operalion
3"3.4 Testexample
Measuring
the
sensitivity
cf a cjigital
receiver,
determinedasafunctionofthebiterrorrateandthe
minimum
permissible
receivelevel,
Setting
upthe testconfiguration
- Disconnectterminal
equipment
[1],[2]
from
the
fiberopticslink(cable rack).
- Loop
theOLA-25 intothesystem
(t6minal
equipmont)viatheexchange
wiresK.,andKr.
(Select
thetestadapters
accordingtothesystem
conneclor
XX).
- Conneclthe
biterrortestseib€tween
the
multiplexequipmentandtheterminal
equipm€nt
3-16
xxo
-I-
-..!--
-:T-
8il2060/
- oo.xx
a-1n
Further lnlormalion Operation
4 Furtherinformation
4.1 Displayed
optical
attenuation
The
optical
attenuation
displayedontheOLA-25
correspondsto theactual insertion
loss,a,which
includesthelossesoftheattenuation
moduleandthe
connectorlosses
(see
Figure
4.1-1).Asthese
losses
are
includedinthecalibration,there
isno
need
to
correctforconnectorlosses
aswouldnormallvbethe
Astwo
connsctors
(one
tothe
instrument
and
the
other
to thesystemcableside)areinvolved
when
characterizing
theinsertionlossoftiberoptics
connectors,
thecablesideonthe
OLA-25
is
represented
bythereferenceconnectorto DIN47256.
Thismakes
itpossible tospecify thewhole
connection
using
W&Gtestcables
(K
31XX
series,
seealso
seclron
J.J.z).
The
attenuationerror
given
inthe
speciiications
(see
alsotheerror
limits
insection
.l
.3)
referstothis
configuration;
seeFigure
4.1-1.
Settho attenuation on the OtÄ-25
- Switch
onthe OLA-25 and
select
the
wavelength.
- Change
the
attenuationontheOLA-25
untilthe
requiredbiterrorrateisdisplayed
onthePF-4.
-t\-
t\
J )----
1."
-t\
1 rt'-'.
Figure3-5b Connect
theoptical
levelmeter
(absolute
level
indBm)
J. IY
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Further lnformatlon OFralion oLA-25
lfthe OLA-25
isopsrated using allernativeconnectors
(FC,
ST,
HM$10)via BN2O6O/0O.)C(testadapters
(see
section
3.3.1
) andusingcablestromolher
manufacturers,
the
errordatainsyection
'l.3
shouldbe
taken
asal./picalvaluo.Theloss€sof bothtest
ports
are
considerably
influencedbytheconnectorsused
(general
condition,
t€mporature)andmaybegreater
thanorl€ssthan
th€additional
+ 0.3
dB stated.
Determining thc recelvcr senrltlvlty
. Disconnect
cable
K, lrom the receiver
Rrz
/-!-\
Warning
. laserradiation
accessible.
- Connect
anoptical
power
levelmeter
(e.g.
OLP-25
fromW&G)
totheOLÄ-25andset
theabsolute
level
displayand
wavelenght
asshown
inFigure
$sb.
- Thedisplayed
level
ontheOLP-25
corresponds
to
lheminimumreceiver
s€nsitivity.
I'lote:
\lVtten
measuringrecaiver
sensitivity
th€fotlowing
must
betaken
intoaccount:
Extinction
factor
Receiver
R ^conngctorloss
xz
OLP-25measur€m€nt
€rror
3-2.O
Furlher ln{ormalion oLA-25
,^-a
:;4
b-
Rellectionpoints
Testports
Attenuationdispla
a=P.
-P
tn oul
Pigtail
9/125
pm
Attenuationmodu
I -.)
Pin, lnputpower
from
system
Prefl.i Reflected
level,
generated
from
the
sumofthe
partial
reflections
"r, Actual
return
loss
Figure
.{.2-1Definition
cf return
loss
P.n:Input
power
from
system
Pou,:OutPut
power
to system
Figure4.'1-1Displayed
attenuatronaon
the
OLA-25
Further lnformation
4^5
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Further Informalion
Thereturn
loss
value
aa
given
insection1.2describes
thebehaviourwhenthe
atlenuaticn
dueto
themodule
rs
minimum
(a< 3dB)
which
istheleast
iavorable
condition.lfthe attenuation
oftheOLA-25isincreased.
thereflectionsdetectedattheoutput
arereducedso
thatthetotal
returnlossisstabilized
atavalue
of
typically26.5dB.
Figure4.2-2 Returnlossa* whentheattenuationof
theOLA-25isaltered
Furtherlnformation
4.2 Return loss
The
attenuatormoduie
(see
Figure4.1-1)o{the
OLA-25hasa returnlossol at least
25dB.
Thereturn
lossof > 23dBgiven
in
thespecifications also
includesthereflectionsduetothetesloortsand
representstheactual
perlormance
oftheO[A-25 inthe
test
conliguration
(see
Figure4.2-1).
The
connectorsto DIN47
2fi arcincludedasrefer-
ence
connections,
asusedonthetestcables from
Wandel
& Goltermann
(K
31XX
series).lltheOLA-25
is
operatedusingalternative
connectors
(FC,
ST,
HMS-10)
in
conneclionwithcables
from
othermanu-
facturers,
theactualreturn
loss,
ae,cannotbe
specifiedaccurately.This
isbecause
ofthegreat
iluctuations
between
thevarious
connector
types
whichdeterminethetotalreflectionbehaviour.
Fudher lnlormalion
4.3Lightattenuation
al non-calibratedwavelengths
TheattenuationdisplayoftheOLA-25 iscalibrated
at
1300nm
and1550nm.The
OlÄ-25
canalsobeused
insystemswith
wavelengthsotherthan1300nmor
1550
nm.Theaüenuationcanbesetcorrectlyusing
correctionfactors
as
given
in
theset
ofcurves
in
Figure
4.3-1.
Example:
OLA.25
4-4
c-o
Funhcr lniormatlorl
-./, 1-L)itiita:tr
?,e , rrt
'li 17Jn -.)
.jria3aii'Ji-i
";aiues3^oß ior
i.: i; lEinlng ihe aciual artenuation
?=Z+44
System
wavelength
= 1250
nm
Theattenuationadisplayed onthe
OLA-25
is
50.0
dB (wavelength switch
on 1300 nm)
The
correction
value
readofftheset
ofcurves
(-50
nmcurve):
a - +0.6
dB
Actualattenuationa = 50.6
dB
Correction
'rö
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