Santec OptoTest OP760 Series User manual

Instruction Manual
OP760 Series
Multichannel High-Speed Optical Power Meter

2
Contacting OptoTest Corporation
+ 1 [phone] (7:30 to 17:00 PT)
www.optotest.com | [email protected]
OptoTest Corporation
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 confidence. 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 © 2022 by OptoTest Corporation, a Santec Company.
ALL RIGHTS RESERVED
MnOP760-RevA

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Table of Contents
Overview ---------------------------------------------------------------------------------------------------------------------------- 4
Initial Preparation ---------------------------------------------------------------------------------------------------------------- 5
Unpacking and Inspection -------------------------------------------------------------------------------------------------- 5
Damaged In Shipment ------------------------------------------------------------------------------------------------------- 5
Standard Contents ------------------------------------------------------------------------------------------------------------ 5
Powering on Instrument -------------------------------------------------------------------------------------------------------- 6
Definition of Specifications ----------------------------------------------------------------------------------------------------- 7
How to Navigate the User Interface ----------------------------------------------------------------------------------------- 9
Mode Select Screen ---------------------------------------------------------------------------------------------------------- 9
Operation Mode Screens -------------------------------------------------------------------------------------------------- 10
Front Panel Operation --------------------------------------------------------------------------------------------------------- 10
OPM Mode ------------------------------------------------------------------------------------------------------------------- 10
Multichannel OPM Mode ------------------------------------------------------------------------------------------------- 12
Settings ------------------------------------------------------------------------------------------------------------------------ 13
Fast Sampling (OPM) ---------------------------------------------------------------------------------------------------- 13
Global Settings (Startup Mode and Temperature) -------------------------------------------------------------- 13
Status Mode ------------------------------------------------------------------------------------------------------------------ 14
Remote Mode ---------------------------------------------------------------------------------------------------------------- 15

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Overview
OptoTest’s OP760 Multichannel Optical Power Meter is a cost-effective solution for manufacturers or
anyone requiring high channel counts and measurements. Available with up to 24 individual optical power
meters, the OP760 builds on the established reputation of OptoTest’s OP710 Multichannel Optical Power
Meter, offering enhancements including built-in USB and Ethernet communication, and simultaneous
power measurements on all channels.
The OP760 is capable of faster than 20ms sampling time over the USB interface. Simultaneous optical
power measurement capability enables users to instantly spot a port failure, making the OP760 an ideal
instrument for demanding production and lab applications. The high-speed on-demand USB
measurements allow for fast feedback to enable active optical alignment for fiber coupling and silicon
photonics applications enabling automation of many manual alignment processes.
The OP760 is backward compatible with all software developed for the OP710, making it a drop-in
upgrade to existing test systems, and can be easily integrated with custom test applications. Ethernet
connectivity makes the OP760 accessible over a network for hassle-free integration into high volume
production environments.
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
R
Electrical port for Remote Head Detector
S
Digital 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 affect your claim for compensation.
Standard Contents
1. Model OP760 Multichannel High-Speed Power Meter
2. Power Cord (U.S. Shipments only)
3. USB A-B cable
4. Certificate of Calibration and if requested the Metrology Report
5. Instruction Manual(s)
6. CD/USB with applicable software and documentation (if ordered)
7. Detector Adapters (if applicable)

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Powering on Instrument
Prior to powering on the unit, verify that the appropriate power supply and power cord is connected. A
power cord with a C13 male connector is needed to mate to this to the C14 inlet female power socket
on the AC to DC desktop power supply. The power supply is attached to an output connector P6
barrel plug (2.5mm I.D. x 5.5mm O.D. x 9.5mm) and connects to the DC barrel power jack on the back
of the unit.
The other end of the C13 power cord should have a grounded 3 prong connector that is appropriate
for the outlets used in the region of operation. For more information, please contact OptoTest
Corporation.
Note: For customers within the United States an appropriate power cord is supplied.
To power the unit on, push the power button until it locks. To power off the unit, push the power button
again to release the button.
When powered on, the instrument will display a splash screen showing the OptoTest logo. Once the
splash screen has finished, the unit will load the mode which has been selected as the Startup Mode in
the Settings screen. To change mode screens, press the home [top left yellow] button and the unit will
transition to the Mode Select screen. The startup mode can be set by the user under the Settings Menu
from the front panel. (Note: Do not attempt to initial USB or ethernet communication to the
instrument. It has not been properly powered up until the splash screen has completed.)
OFF
ON
AC to DC desktop power supply with
C14 female inlet power socket and
barrel plug output connector.
C13 male connector power cord.
The barrel plug output connector
connects to the DC barrel power
jack on the back of the unit.

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

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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. 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 must acclimate to
a changing environment. 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.
Recommended Recalibration Period
This is the recommended time period for re-calibration in order to maintain accurate 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 areal 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.
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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How to Navigate the User Interface
Mode Select Screen
On the Mode Select screen, press the select operation modes for the unit, such as OPM, M.OPM,
Settings, and Status. The up and down arrows on the left side of the screen will navigate the pages of
mode screens. Pressing the home button on the Mode Select screen will put the unit back into the mode
that it was in most recently.
The Mode Select screen functions as a home screen for the unit. Operators can use the Mode Select
screen as a point of reference for the user interface or if they need to change Operation Modes.
The unit’s Mode Select screen deploys several modes. Each page has three selections to choose from
and the page number is indicated on the bottom of the screen by the placement of the wedge as seen in
the figure below.
Below is a brief description of the operation modes on each page of the Mode Select Screen:
Mode Select Screen Page 1
OPM
Displays the optical power incident on the selected detector.
M.OPM
Multi-Channel Optical Power Meter

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Mode Select Screen Page 2
Settings
Allows certain settings—such as pass/fail criteria and measurement adjustment factors—to
be changed and saved on the unit.
Status
Shows current settings and system information.
Operation Mode Screens
When the unit is in one of its operation screens, the buttons will operate largely the same. Buttons on the
second column will select options such as wavelength and channel switching. The first column page
buttons under the home button will select the pages of these procedures and options. Pressing the home
button in an operation screen will bring the unit back to the Mode Select Screen and pressing it while in a
procedure screen, such as for wavelength and channel switching, will take the unit back to the root
screen for that operation mode.
Front Panel Operation
OPM Mode
This mode controls the optical power meter on the unit, but not the source. OPM mode supports all the
functions of a state-of-the-art optical power meter such as multiple wavelength calibrations, absolute
mode (dBm), and relative mode (dB).
This is a preferred mode for performing measurements using an external optical source.
The indicators below the power reading visually depict the measured power in terms of the current gain
stage of the detector and whether the unit is measuring on the high or low end of that gain stage.
The unit, by default, operates in “Auto Range” mode meaning that it will find the gain stage in which it will
be able to measure the optical power most accurately. The gain stage is indicated by highlighted boxes
from 0 to 7 on the screen to the right of the Auto / Hold indicator. In the OPM Screen figures on the next
page, gain stage 6 is indicated by the highlighted 7 boxes.
However, the unit has an option to operate in “Range Hold” mode wherein it will remain in the same gain
stage regardless of the power incident on the detector.

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Note: In “Range Hold” one should not be operating at the high or low end of the range. This will increase
the error of the measurement. The high-end range is displayed as a full yellow bar below the power
measurement compared to an empty bar for low end range.
OPM Screen (Page 1)
OPM Screen Page 1 & 2
Selected page.
Changes the selected wavelength for the power meter. Typically, for power meters with
InGaAs this is 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, and 1625nm; and for
Silicon Power Meters the wavelengths are 650nm, 850nm, and 980nm
Switches the display between absolute (dBm) and relative (dB) measurement modes. The
active mode will be yellow.
Performs a measurement of the current optical power and stores it. The unit will then
measure the optical power relative to the reference power. A loss of power will be displayed
as a negative value.
Prevents the unit from changing gain stages on its detector. This option is good if the user is
measuring within a limited range of optical power as the accuracy will suffer if the power is
not within the optimal limits for that gain stage.
Other pages (Page 3 is blank).
Toggle channels (Page 2)
Returns to the Home Screen.
OPM Screen (Page 2)

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Multichannel OPM Mode
This mode is capable of measuring output power simultaneously up to 24 individual optical power meters.
Each of the functions of a state-of-the-art optical power meter such as multiple wavelength calibrations,
absolute mode (dBm), and relative mode (dB) are applied to all channels simultaneously.
Multichannel OPM screen (page 1)
OPM Screen Page 1 & 2
Selected page.
Changes the selected wavelength for the power meter for all channels. Typically, for power
meters with InGaAs this is 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, and
1625nm; and for Silicon Power Meters the wavelengths are 650nm, 850nm, and 980nm
Switches the display between absolute (dBm) and relative (dB) measurement modes for all
channels. The active mode will be yellow.
Performs a measurement of the current optical power and stores it. The unit will then
measure the optical power relative to the reference power. A loss of power will be displayed
as a negative value. On Page 2, this button references the currently selected channel
in the lighter frame.
Run or stop the continuous measurement of all channels.
On Page 2, this prevents the unit from changing gain stages on its detector. This option is
good if the user is measuring within a limited range of optical power as accuracy will suffer if
the power is not within the optimal limits for that gain stage for all channels.
Other pages
Toggle channels (Page 2). Note: the selected channel can also be changed by pressing one
of the channel displays.
Multichannel OPM screen (page 2)

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Returns to the Home Screen.
Settings
The Settings Mode is designed to allow the user to configure certain parameters for the unit including
sampling rate, startup mode and temperature.
Fast Sampling (OPM)
Settings screen (page 1)
The standard sampling rate is 20 samples per second via USB when fast sampling is disabled. The
sampling rate is increased to allow up to 100 samples per second via the USB when this option is
enabled. Note: when fast sampling is enabled, this can increase the amount of noise in the power
measurements.
Global Settings (Startup Mode and Temperature)
Settings screen with startup Mode and temperature options (page 2)
Disable or enable fast sampling option

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Startup Mode is a global setting which allows the operator to specify which Operation Mode to load each
time the unit is powered on.
Temperature Units setting allows the operator to specify whether they would prefer the unit to display
the ambient temperature in Celsius or Fahrenheit.
Status Mode
The Status Mode is a troubleshooting tool which displays the state of the various user
configurable settings on the OP760. It can also be used to quickly check the unit’s settings
before beginning to test. The settings, which are displayed on this screen, are as follows: Status
Mode Page 1
Firmware Versions
Miscellaneous Settings
• EEPROM Write Protect
• Temperature
Status Mode Page 2
OPM Settings
• Fast Sampling

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Status Mode Page 3
QR Code
Remote Mode
When the unit is connected via USB or ethernet and is communicating with the instrument, the remote
mode screen will appear according to the figure below.
Remote mode screen
4750 Calle Quetzal, Camarillo, CA 93012
www.optotest.com | [e-mail]
Tel: [phone]