OptoTest OP735 User manual
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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 © 2016 by OptoTest Corp
ALL RIGHTS RESERVED
PRINTED IN THE UNITED STATES OF AMERICA
MnOP735-RevC
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Table of Contents
Overview 3
Initial Preparation 4
Denition of Specications 5
Front Panel Operation 9
Display Operation 10
Smart Remote Head Option 11
USB Control of the OP735 11
Warranty Information 12
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Overview
The OP735 can be congured up to 4 channels with a mix of InGaAs, Silicon, and
High Power Detectors. This unit is ideal as a compact stand-alone power meter or
used in conjunction with a stabilized light source to measure insertion loss.
Designed for a high speed data acquisition on ber optic components, the OP735
provides absolute or relative measurements with high resolution and linearity.
The OP735 is available starting at one channel up to four channels and can be
congured for a variety of detector and connector interfaces.
Available detector options:
IN1 1mm InGaAs detector with Universal Adapter
IN3 3mm InGaAs detector with Universal Adapter
IN5 5mm InGaAs detector with Universal Adapter
IN10 10mm InGaAs detector with Universal Adapter
SI3 3mm Silicon detector with Universal Adapter
RElectrical port for Remote Head Detector
SDigital port for Integrating Sphere
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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 OP735 Multichannel Optical Power 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 with applicable software and documentation (if ordered)
7. Rack mount kit (optional)
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Denition of Specications
Dynamic Range
The dynamic range 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)
Linearity
Photodetectors are, by nature, very linear over a wide range of optical input powers,
but the power meter electronics can aect the overall system linearity. The power
meter linearity is characterized and specied 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) should
be measured.
Calibration Wavelength
The calibration wavelengths are the nominal wavelengths of the instrument is
calibration points. The exact wavelength of each particular calibration is stated in the
certicate of calibration.
Calibration Traceability
The detector’s absolute calibration data is directly traceable to N.I.S.T. at the specied
calibration wavelength and the specied power level, typically -10dBm.
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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.
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.
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Definition of Specifications
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.
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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.
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Ch1
dBm
-12.45
1310nm
22.4°C
dBm
dB
Front Panel Operation
Channel
Indicator
Power Reading
Wavelength
Relative Measurement
Absolute Measurement
Channel Selection
Internal (ambient)
Temperature
Wavelength
Indicator
Wavelength
The wavelength button toggles through the available calibration wavelength.
Typically for power meters with InGaAs this is 850nm, 980nm, 1300nm, 1310nm,
1480nm, 1550nm, and 1625nm.
Relative Measurement
The dB button switches the power meter into relative measurement mode. At
the same time it stores the current absolute power reading 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 dB
button stores the current power level as the new reference.
For each wavelength and for each channel a reference reading can be stored.
Absolute Measurement
The dBm button switches the power meter into absolute measurement mode.
Channel Selection
By pressing the right button the instrument display switches to the next channel,
it will stop at the last channel. Similarly the left button switches the instrument to
the previous channel. Each channel retains the calibration wavelength, absolute or
relative measurement mode and the corresponding reference power levels.
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Ref: -12.45dBm
Ch 01
dB
-0.316
1310nm
22.4°C
Ch 01
dBm
-12.45
1310nm
22.4°C
Channel
Display
Absolute Power Relative Power
Wavelength
Reference
Power
Internal (ambient)
Temperature
Channel Display
Shows the current selected channel.
Wavelength
Displays the currently selected calibration wavelength.
Absolute Power
The absolute power is displayed in dBm.
Relative Power
The relative power is displayed in dB. It is the difference between the reference
power and the measured absolute power.
Internal Temperature
The internal, ambient temperature is displayed in either ºF (Fahrenheit) or ºC
(Celsius), that selection is performed with a USB command.
USB
When communicating with the instrument via USB, the unit will display the
OptoTest logo.
Display Operation
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Smart Remote Head Option
The OP735 when manufactured has the option of having a digital OPM port. This
port interfaces with a smart remote head and/or a smart integrating sphere. When
no remote head is connected the unit will function normally as described in this
manual.
For the remote head to be properly loaded by the system, the remote head
should be connected while the unit is powered down. Connect the remote head
to the mainframe and power up the system. Linearity and absolute calibration are
established by the remote head, not the mainframe.
USB Control of the OP735
The OP735 can be controlled via the USB bus. Upon request, OptoTest can supply
the appropriate DLLs along with sample programs to facilitate the software creation
process. For these DLLs please contact [email protected].
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Warranty Information
OptoTest Corp. warrants this product to be free from defects in material and
workmanship for a period of one year from date of shipment. During the warranty
period we will, at our option, either repair or replace any product that proves to
be defective. To exercise this warranty contact OptoTest Corp. headquarters. You
will be given prompt assistance and return instructions. Repairs will be made and
the instrument returned, transportation prepaid. Repaired products are warranted
for the balance of the original warranty period, or at least 90 days.
NOTE: Do not send instruments for any reason without contacting OptoTest
headquarters first.
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