OptoTest OP815 Manual de usuario
(Also supports the OP850)
www.optotest.com 1.805.987.1700
Insertion Loss Test Set
Instruction Manual
OP815
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Contacting OptoTest Corporation
1.805.987.1700 (7:30 a.m. to 5 p.m. PST)
www.optotest.com
OptoTest Corp.
4750 Calle Quetzal
Camarillo, CA 93012 USA
Notice of Proprietary Rights
The design concepts and engineering details embodied in this manual, which are the
property of OptoTest Corporation, are to be maintained in strict condence. No element
or detail of this manual is to be spuriously used or disclosed without the express written
permission of OptoTest Corporation. All rights are reserved. No part of this publication
may be reproduced, stored in a retrieval system, or transmitted in any form or by any
means, electronic, mechanical, photocopying, recording, or otherwise, without prior
written permission from OptoTest Corporation.
COPYRIGHT © 2017 by OptoTest Corp
ALL RIGHTS RESERVED
PRINTED IN THE UNITED STATES OF AMERICA
MnOP815-RevE
OP815
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Table of Contents
Overview 3
Initial Preparation 4
Denition of Specications 5
Front Panel Operation OP815 9
Front Panel Operation OP850 11
Display Operation OP815/OP850 13
Smart Remote Head Option 14
USB Control of the OP815/OP850 15
Warranty Information 16
OP815
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Overview
The OP815 oers an economical approach for insertion loss measurements for either
singlemode cables or multimode cables. For the multimode testing the OP815 is
equipped with an 850nm LED, a 1300nm LED or a switched 850nm/1300nm dual
LED source. The sources for the single mode conguration consists of Fabry-Perot
LASERs with 1310nm and 1550nm wavelengths. For all those models, the power
meter is equipped with a ber terminated InGaAs detector.
For specic applications, such as plastic optical ber (POF), the OP815 can be equipped
with various LED sources (480/630/650/850nm) with internal launch bers of various
sizes (50μm to 900μm). For lower wavelength sources the power meter is equipped with
a 3mm Si (silicon) detector.
Dual wavelength instruments: With dual wavelength instruments, that have a single
combined optical port, the sources are either internally switched (multimode) or optically
combined (single mode). With those instruments only one optical source is active at a
time.
OP850 (Multichannel IL Test Set)
The OP850 is similar to the OP815 in that it is primarily an insertion loss test set with a
source and a power meter. The OP850 is a multichannel version of the OP815. Both the
OP815 and OP850 have similar modes (OPM, IL, and SRC). These modes function the
same, but the only dierence is the front panel button behave a little dierent for the two
units.
OP815
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Initial Preparation
Unpacking and Inspection
The unit was carefully inspected, mechanically, electrically and optically before shipment.
When received, the shipping carton should contain the items listed in Standard Contents.
Account for and inspect each item. In the event of a damaged instrument, write or call
OptoTest Corp, California.
Note: Be aware that accessories such as detector adapters, remote head detectors, and
high performance reference cables will be located inside a small box labeled “Accessories
Inside”. If this box is not included with the original shipment, contact OptoTest of their
nearest distributor.
Please retain the shipping container in case re-shipment is required for any reason.
Damaged In Shipment
All instruments are shipped F.O.B. Camarillo when ordered from OptoTest.
If you receive a damaged instrument you should:
1. Report the damage to your shipper immediately.
2. Inform OptoTest Corporation.
3. Save all shipping cartons.
Failure to follow this procedure may aect your claim for compensation.
Standard Contents
1. Model OP815/OP850 Insertion Loss Meter
2. Power Cord (U.S. Shipments only)
3. USB A-B cable
4. Certicate of Calibration and if requested the Metrology Report
5. Instruction Manual(s)
6. CD/USB drive with applicable software and documentation (if ordered)
7. Rack mount kit (optional)
OP815
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Denition of Specications
Dynamic Range
The dynamic range, or measurement range, of the optical power meter spans from the
maximal power level the instrument can measure, without major saturation to the detector,
to the minimal power level where the thermal noise of the detector becomes greater
than the current produced by the incident light. For accurate power measurements, it is
NOT recommended to measure power levels at either end of the dynamic range. (see
Linearity). The dynamic range is measured by comparing the absolute measured power
against a reference power. When the difference between the two exceeds 1dB either
end of the dynamic range has been reached.
Linearity
Photodetectors are, by nature, very linear over a wide range of optical input powers,
but the power meter electronics can affect the overall system linearity. The power meter
linearity is characterized and specified to know the measurement accuracy and linearity
over the full dynamic range. For accurate insertion loss measurements only power levels
that fall within the range with the best linearity (+/-0.05dB or better) should be measured.
Calibration Wavelength
The calibration wavelengths are the nominal wavelengths of the instruments calibration
points. The exact wavelength of each particular calibration is stated in the certificate of
calibration.
Calibration Traceability
The detector’s absolute calibration data is directly traceable to N.I.S.T. at the specified
calibration wavelength and the specified power level, typically -10dBm.
OP815
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Denition of Specications
Spectral Responsivity
Depending on the detector type, InGaAs (Indium Gallium Arsenide) or Silicon the spectral
responsivity, the eciency of the detector to convert optical power into electrical current
changes with wavelength.
Responsivity of InGaAs Detectors Responsivity of Silicon Detectors
Note that other detector types are available such as IN5 (5mm InGaAs) IN10 (10mm InGaAs)
as well as WSR (wide spectral range) and might exhibit a different spectral responsivity.
Absolute Accuracy
The absolute accuracy specification includes the total measurement uncertainties
involved in the calibration process including the transfer of the absolute power standard
from N.I.S.T. Contact OptoTest for the detailed chain of uncertainties.
Optical Power Meter, Channel Performance
For multichannel instruments, the power meter circuit converts and digitizes the optical
power level with the given sampling interval. Changes in light levels such as modulation
will be averaged within that sampling interval.
Instrument, Warm up Time
Optical power meters, in general, do not need any warm-up time unless the instrument
has to acclimate to a changing environment. In order to calibrate the instrument or to
perform stable measurements, the instrument should be acclimated for 15 minutes for
each 5ºC of temperature differential. For example if the instrument was stored at 18ºC
and brought into an environment of 28ºC the instrument should be allowed to warm up
for 30 minutes.
OP815
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Denition of Specications
Recommended Recalibration Period
This is the recommended time period for re-calibration in order to maintain accuracy
specifications. The recommendation is made based upon statistics on detector aging;
however it is up to the metrology policies and procedures within each company to
define the calibration cycles on optical power meters.
Optical Power Meter, Fiber Compatibility
The amount of aerial coverage of the detector, or the portion of the light emitted from
the fiber being measured, depends on the mechanical features of the optical interface,
the active area of the detector and the numerical aperture (NA) of the fiber. A fiber with a
large NA, for example 100/140 multimode fiber, might not under fill a small area detector
hence the absolute power reading will be less than actual.
Return Loss Range
The lower end of the return loss (low return loss = high reflection) defines the level where
the instrument is saturated by large reflections. The higher end of the return loss (high
return loss = very weak reflections) is given by capability of the instrument to amplify and
resolve reflection out of the noise floor.
Return Loss Accuracy
The Return Loss Accuracy is measured using an optical variable attenuator
connected to a >98% reflector. The insertion loss of the attenuator is initially
quantified against a reference optical power meter. The actual attenuation is
then used to calculate the generated reflection, where the resulting reflection
= 2x (variable attenuation + insertion loss of attenuator) + reflector coefficient.
Accuracy of return loss measurements can also be affected by the reference cable and
any excessive losses at the front panel interface.
OP815
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Definition of Specifications
Reference Cable
The reference cable is the cable with which the DUTs will be measured against. Typically
reference cables are required to be of a defined quality with a specified connector/
endface polish.
Instrument, Environmental
Operating Temperature: This is the temperature range in which the instrument will
conform to the specifications after the specified warm up time.
Storage Temperature: This is the temperature range at which the instrument can
be stored with the power off without any damage or any loss of specification to the
instrument. It is required that the instrument be brought back to within the operating
temperature range before it is turned on.
Humidity: The relative non-condensing humidity levels allowed in the operating
temperature range.
OP815
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Wavelength
The wavelength button 1 toggles through the available calibration wavelengths and
source selection depending on the mode of the instrument.
OPM Mode: The measurement wavelengths for the OP815 are 850nm, 1300nm,
1310nm, 1480nm, and 1550nm for InGaAs detectors and 650nm, 850nm, and 980nm
for silicon detectors, unless otherwise noted.
IL Mode: The wavelength button toggles the source wavelength concurrently with the
power meter calibration wavelength. For OP815 with a single wavelength source there
is no wavelength to be selected, for dual wavelength implementations the wavelength
selection switches between the two sources.
Source Mode: The wavelength button toggles the source wavelength.
Reference
For OPM Mode: The Ref button 2 switches the power meter into relative measurement
mode. At the same time it stores the current absolute power reading at the current
wavelength as the reference. The reference power is displayed above the relative power
reading (see illustration of Display). If the instrument is already in relative measurement
mode pressing the Ref button stores the current power level as the new reference. For
each wavelength a reference reading can be stored.
Front Panel Operation – OP815
Mode
Indicator
Power Reading
Wavelength
Reference
Absolute Measurement
Mode Selection
(OPM, IL, Source)
Internal (ambient)
Temperature
Wavelength
Indicator
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