Wandel & Goltermann OLA-35 Manual

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Description and
Operating Manual
-
OLA-35
Low-Ref lection
Optical Attenuator
-
BN 2209, series A ff
- Order No. BN 2209100.82
Edition 406313.91
Subpa io change wlthoul notlce
Our normal guarantee and dellverylerms apply
Pnnted In the Federal Republic ofGermany
C Wandel B Gollermaln GmbH 8 Ca EnlnQen J A 1990
Wandel & Goltermann
-
Electron~cMeasurementTechnology
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Address
International Sales and Service
Head office
Wandel & GoltermannGmbH & Co
Postfach 1262
D-7412
Eningen u.A.
Federal Republic of Germany
Tel. [phone]
tlx. 7 29 833 wug d
FAX [phone]
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.. Contents
1 Specifications ................. 1-1
1.1 Wavelength ...................... 1-1
1.2 Attenuation
...................... 1-1
1.3 Error limits
...................... 1-2
1.4 Testports
....................... 1-3
1.5 Display ......................... 1-3
1.6 Generalspecifications ............. 1-4
1.7 Orderinginformation ............... 1-5
2 Generalinformation .
preparingfor use .............. 2-1
2.1 Test ports ....................... 2-2
2.2 Powersupply
.................... 2-9
2.3 EMllRFlsuppression ............. 2-14
3 Operation .................... 3-3
3.1 Overview ........................ 3-3
3.2 Instrumentsettings
................ 3-6
3.3 Looping the OLA-35 into
a testcircuit 3-11
3.4 Testexample
................... 3-18
4 Measurementnotes ............ 4-1
4.1 Displayedopticalattenuation
........ 4-1
4.2 Returnloss
...................... 4-41
4.3 Lightattenuation at non-calibrated
wavelengths
..................... 4-8
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OLA-35 Introduction
lntroduction
The OLA-35 is an optical attenuator designedfor
low back reflectionsignalattenuationonfiber
opticssystemscarriedby single-mode fibers
(91125 pm)operatingat 1300 and 1550 nm.
Dueto its excellentreflectioncharacteristics, the
OLA-35 is particularlysuitable for useon back
reflection-sensitive laser systems or on new
WDM (wavelengthdivisionmultiplex) equipment.
The attenuatormodule is a neutraldensity filter
placedinthe broadenedlight beam betweenthe
input and outputconnections.The attenuation
value is variable between2 and
65 dB (1 300 nm)
or between 2 and 60 dB (1550 nm) and depends
onthe positionofthe filter, which is set usingthe
rotary controlonthe front panel.
The minimal insertionloss of
5 2 dB includesthe
lossesof bothtest ports.
The actualattenuationis displayedwith a
resolutionof
0.1 dB on the LC display. A high
linearityis attainedfor the entire attenuation
rangeby individualcalibrationof the display to
matchthe attenuationfilter characteristic. The
OLA-35 isfactory calibratedat 1300 and
1550 nm. It is set to the corresponding nominal
wavelength usingthe slide switch.
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Introduction OLA-35
The OLA-35 is loopedintothetest circuit using
test adapters, availablefor all standardconnector
systems (DIN, FC,
ST, etc.).
The test portsare physicalcontact (PC)types.
This, together with the anti-reflex coated
components inthe attenuator module,
guarantees very low reflectionoperation.
A highreturnloss of
> 35 dB can be obtained
with the OLA-35. However, it can only be
realizedwhenthe connectingcablesusedalso
havevery low reflectionconnectors(e.g. DIN,
Super FGPC, Radial1VFO). Series K31XX test
cablesfrom
W&G usethis typeof connector and
aretherefore particularlysuitablefor back
reflection-sensitiveapplications.
In normaloperationthe display of the OLA-35 is
battery-powered.
If the attenuationcan be readdirectly from a bit
error tester or opticalpower levelmeter in the
test circuit, the display can be switchedoff, as
the
OLA-35 stillfunctionsas an attenuator inthis
mode.
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1 Specifications
1.1 Wavelength ......................... 1-1
1.2 Attenuation ......................... 1-1
1.3 Error limits .......................... 1-2
1.4 Testports
.......................... 1-3
1.5 Display ............................ 1-3
1.6 Generalspecifications ................. 1-4
1.7 Orderinginformation .................. 1-5
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OLA-35 Specifications
1 Specifications
1.1 Wavelength
Usefulrange .............. 1250to 1600nrn
Calibratedat
............. 1300and 1550nm
1.2 Attenuation
Nominal range
1300nm ................... 2to65dB
................... 1550nrn 2to60dB
Min. residualattenuation ............. 5 2 dB
Setting
............ continuouslyvariable over
entire range
(1 0turns)
Returnloss1)
..................... > 35dB
Max. tolerable input level
.......... +I0dBm
'1 Valid for DIN connectors. Typical value when
"high returnloss" connectors with a return
loss
of 2 39 dB are used, e.g. Super SG
PC, Super
FC-PC. Valid for input andoutput.
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Specifications OM35
1.3 Error limits
............................ Overall error1) 4- 0.95 dB
................ Linearity2)
f (0.2 dB +0.3 %
of displayed value)
Attenuation setting
...............................
repeatability2) f 0.1 dB
') Includingconnector losses over nominal
rangeof
use. The total error is increased by
typically +0.3 dB when other connectors (FC,
ST, SC, HMS-10) are used.
2, Excluding remating.
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OLA-35 Specifications
-
1.4 Test ports
Fibertype ....
Internal single-mode fiber 91125 pm
connector type
.... 0 2.5 mm (physical contact)
Test adapters
for directly connecting various
2.5 mmconnectors
.......... DIN, FGPC,
ST, HMS-1
O
Adapter cables
Referencecable (91125 pm);
one end completed with DINconnector,
other end choice from
.......... DIN, FGPC,
HMS-0, -1
O
Biconic, Radiall,pigtail
Length 2
.............................
1.5 Display
Type .3 digit LCDisplay
...................
Display value ........... absoluteattenuation
(incl. connector loss)
Resolution 0.1 d~
........................
Over- or underrange ............ LO (< 2 d~)
indication
............ HI (> 65 (60) d~)
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Specifications OLA35
1.6 General specifications
Power supply
Built-in, exchangeable
dry battery
................. 9 V, IEC6LF 22
............ or NiCdbattery e.g. Varta
TR 718
A.C. power ............... separatea.c. line
adapterlcharger
Operatingtime
................
with dry battery approx.
45 h
..............
with NiCdbattery approx. 10h
Auto-off after 15 minutes,or permanent
operation. When workingwith fixed attenuation
valuesthe instrumentcan be left switchedoff.
....... EMIIRFl suppression to DBP regulation
104611984or ClSPR
Publ.
11, Cenelec HD 344
Ambient temperature
.......
Nominalrange of use
-1 O0 Cto +50° C
.......
Storage andtransport
-40" Cto +70° C
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OLA-35 Specifications
-. Humidity
........ < +40° C (relative humidity)
5 to 95 %
> +40° C (absolute humidity) ....... < 30 g/m3
..........
Size (w x hxdin mm) 98x 170x55
Weight
...................... approx. 900 g
1.7 Ordering information
QLA-35 OptlcalAttenuator') BN 2209101
To operatethe OLA-35, two test adapters are
required which correspond to thetype of
connector system used.
Test adapter "fiber to fiber" connection
(at extra cost)
DIN 47256 .................. BN 2060100.30
FC-PC (NTT) ............... BN 2060100.31
ST type AT & T .............. BN 2060/00,32
HMS-1 OIA (SMA
connection) ... BN 2060100.34
HMS-10
(screw connection
or BNCplug)
................ BN 2060100.35
SGPC (NU) ............... BN 2060100.38
') Without test adapters
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Specifications OLA-35
Accessories(chargedextra)
Adapter andconnectorcables (91125 pm)*),
from DIN47256 connectorto
-
..................... DIN47256 K3100
...................
FC type NTT K3101
....................
Radiall VFO K3102
........
Diamond HMS-O(3.5 mm) K3104
.......................
Biconic K3105
.......
Diamond HMS-10 (2.5 mm) K3106
........................
Pigtail K3199
...............
Shoulderstrap BN820100.52
.................
NiCdbattery BN820100.50
LNT-1 AC Line AdapterlCharger
. . BN2068101
with linecord and 2 charger cables
Please specify type of linecord required:
Linecordwith
...................
Europeanplug K490
...................
USIJapanplug K491
........................
UK plug K492
..................
Australian plug K493
-
")The DINtest adapter BN2060100.30 is
required in order to connectthe adapter cables.
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OLA-35
Specifications
..........
MK-1 equipmentcase BN 2090/05
-
to hold 1 x OLA-35, 1 x LNT-1,
optical cables etc.
..........
MK-4 equipmentcase BN
209211 1
to hold 3 instruments inthe
OLS-IOLP-IOLA- range,
2 x LNT-1, cables andtest adapters.
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2 General information .
preparingfor use
2.1 Test ports ......................... 2-2
2.1.1 Fittingthe test adapters
.............. 2-2
2.1.2 Cleaningthetest ports
............... 2-4
2.2 Powersupply
...................... 2-9
2.2.1 Dry andrechargeablebattery operation
. . 2-9
2.2.2
AC lineoperation and batery recharging
with the LNT-1
.................... 2-12
2.3 EMllRFlsuppression
............... 2-14
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OLA-35
General information
2 General information -
preparing for use
Safety instructions
The OLA-35 is a passive optical attenuator. The
instrument presents
no danger from optical
radiation. However, when connecting the
OLA-35 into a system which is in operation, it
should be noted that laser radiation isthen
accessible. Observe the relevant regulations on
protection when using lasers.
Wear & Tear
The OLA-35 isdesigned for field use and is able
to cope with the wear and tear of everyday use.
Due to the way inwhich the
OLA-35 is
constructed, the proportion of precision optical
components is higherthan inother field
equipment which makes it more subjectto wear
andtear. The instrument shouldtherefore be
handled with care and protected from misuse.
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