OptoTest op710 User manual

Multichannel Optical Power Meter
Instruction Manual
OP710
www.optotest.com 1.805.987.1700

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Contacting OptoTest Corporation
1.805.987.1700 (7:30 a.m. to 5 p.m. PST)
www.optotest.com
[email protected]
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 condence. 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
MnOP710-RevD

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Table of Contents
Overview 4
Initial Preparation 5
Denition of Specications 6
Front Panel Operation 9
Display Operation 10
Warranty Information 11

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Overview
The OP710 oers an economical approach for optical power measurement
applications where multiple channels are needed. Unlike other systems this
instrument is built up with individual power meters allowing for unparalleled
simultaneous data acquisition over all channels with a sampling rate of up to 10
samples per second.
It is available starting at 1 channel up to 24 channels and can be congured for a
variety of detector and connector interfaces. With the rack mount option multiple
instruments can be combined and congured for even higher channel count.
Available detector options:
IN1 1mm InGaAs detector with 5/8” Adapter
IN3 3mm InGaAs detector with 5/8” Adapter
IN5 5mm InGaAs detector with 5/8” Adapter
IN10 10mm InGaAs detector with 5/8” Adapter
HP 2mm High Power InGaAs detector with 5/8” Adapter
SI3 3mm Silicon detector with 5/8” 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.
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 aect your claim for compensation.
Standard Contents
1. Model OP710 Multichannel Optical Power Meter
2. Power Cord (U.S. Shipments only)
3. USB A-B cable
4. Certicate of Calibration and if requested the Metrology Report
5. Instruction Manual(s)
6. CD with applicable software and documentation (if ordered)
7. Rackmount Kit (optional)

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Definition of Specifications
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 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) 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 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.

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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.
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.
Definition of Specifications
Spectral Responsivity
Depending on the detector type, InGaAs (Indium Gallium Arsenide) or Silicon the
spectral responsivity, the efficiency of the detector to convert optical power into
electrical current changes with wavelength.

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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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Front Panel Operation
Channel
Indicator
Wavelength
Wavelength
Relative Measurement
Absolute Measurement
Channel Selection
Internal (ambient)
Temperature
Wavelength
Indicator
Ch1
nm
1310
1300nm
77.3°F
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; and for Silicon Power Meters the wavelengths are
650nm, 850nm, and 980nm.
Relative Measurement
The Ref button switches the power meter into relative measurement mode. It also
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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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 software, the Unit should be placed
into Remote Mode to preserve the integrity of the data being transferred. The
screen will look like this:
Ch1
dBm
-12.45
1310nm
22.4°C Ref: -12.45dBm
Ch1
dB
-0.316
1310nm
22.4°C
Channel
Absolute Power Relative Power
Wavelength
Reference
Power
Internal (ambient)
Temperature
Front Panel Display
OP710 V111 710

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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.

For Application Notes, more detailed Testing Instructions, and the
most up-to-date OptoTest News go to www.optobuzz.com

www.optotest.com
1.805.987.1700