EXFO OSA20 User manual

www.EXFO.com
OSA20
Optical Spectrum Analyzer
User Guide
OSA20_UG_1.10v1.1

OSA20 User Guide 3
About This Manual
Subject This manual explains how to install, set-up and use the OSA20 optical spectrum analyzer.
It also explains how to perform basic maintenance operations.
This document applies to the OSA20 version 1.10.x.
Intended Readers Users of this manual must be familiar with fiber optic technology.
Date 19 June 2019
Manual Reference OSA20_UG_1.10v1.1
Typographical
Conventions
Symbols
Abbreviations
Used
bold Identifies interface objects such as menu names, labels, buttons and
icons.
italic Identifies references to other sections or other guides.
monospace Identifies portions of program codes, command lines, or messages
displayed in command windows.
Important
Identifies important information to which you must pay particular attention.
Warning
Indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury. Do not proceed unless you understand and meet
the required conditions.
Caution
Indicates a potentially hazardous situation which, if not avoided, may result
in component damage. Do not proceed unless you understand and meet the
required conditions.
Abbreviation Meaning
AC Alternating Current
APC Angle-Physical Contact
ASE Amplified Spontaneous Emission
DC Direct Current

About This Manual
4OSA20 User Guide
Copyright Copyright © 2012–2019 by EXFO. Published by EXFO. All rights reserved.
This documentation is provided as a user guide to EXFO customers and potential
customers only. The contents of this document may not be reproduced in any part or as
a whole, transcribed, stored in a retrieval system, translated into any language, or
transmitted in any form or by any means (electronic, mechanical, magnetic, optical,
chemical, photocopying, manual, or otherwise) without the prior written permission of
EXFO.
Product Warranty
and Limitation of
Warranty
For detailed information about the sales terms and conditions, visit the EXFO web site at
www.exfo.com/how-to-buy/sales-terms-conditions
Contact
Information
To obtain after-sales service or technical support for this product, contact EXFO at one of
the following numbers.
For detailed information about technical support and for a list of other worldwide
locations, visit the EXFO web site at
www.EXFO.com/support
To accelerate the process, please have information such as the name and the serial
number (see the product identification label), as well as a description of your problem,
close at hand.
DUT Device Under Test
ELED Edge Light Emitting Diode
FP Fabry-Perot
GPIB General Purpose Interface Bus
MSK HI/LO High/Low Mask
NF Noise Figure
PC Physical Contact
RBW Resolution Bandwidth
REF Reference
RMS Root Mean Square
SELV Safety Extra-Low Voltage
TRANS Transfer function
WEEE Waste Electrical and Electronic Equipment
Abbreviation Meaning
Technical Support Group
400 Godin Avenue
Quebec (Quebec) G1M 2K2
CANADA
Tel. USA and Canada: 1 866 683-0155
Fax: [phone]
E-mail: [e-mail]

OSA20 User Guide 5
Table of Contents
About This Manual..................................................................................................................................... 3
Table of Contents ...................................................................................................................................... 5
Important Safety Information for Your Product........................................................................................... 9
1. Product Presentation ........................................................................................................................ 13
1.1 Technical Specifications ..................................................................................................................... 13
1.2 Product Overview................................................................................................................................. 16
1.2.1 Front Panel ............................................................................................................................. 16
1.2.2 Left-side Panel: Cooling Fan ................................................................................................. 18
1.2.3 Right-side Panel: Connectors................................................................................................ 19
1.2.4 Rear Panel .............................................................................................................................. 21
2. Installing and Connecting the OSA20 ................................................................................................ 23
2.1 Unpacking and Installing the OSA20 .................................................................................................. 23
2.2 Connecting the OSA20 to a Power Source......................................................................................... 25
2.2.1 Connecting the OSA20 to the Wall Socket Using the Power Adapter ................................ 25
2.2.2 Connecting the OSA20 to a 48 V DC Power Source ............................................................ 26
2.3 Connecting a Light Source to the OSA20 ........................................................................................... 27
2.4 Handling USB Devices with the OSA20 .............................................................................................. 28
2.4.1 Connecting USB Devices to the OSA20................................................................................ 28
2.4.2 Disconnecting USB Storage Devices from the OSA20 ........................................................ 28
2.5 Sharing the OSA20 Display with an External Screen ......................................................................... 29
3. Turning on/off the OSA20 and Accessing an Analysis Mode.............................................................. 31
3.1 Accessing the OSA20 Home Window................................................................................................. 31
3.2 Setting General Parameters ................................................................................................................ 32
3.3 Accessing an Analysis Mode .............................................................................................................. 35
3.4 Turning off the OSA20 ......................................................................................................................... 39
4. Defining Scan Measurement Parameters........................................................................................... 41
4.1 Scanning the Optical Spectrum........................................................................................................... 41
4.1.1 Defining Scan Parameters..................................................................................................... 41
4.1.2 Manually Starting/Stopping the Optical Spectrum Acquisition .......................................... 45
4.1.3 Triggering the Optical Spectrum Acquisition ....................................................................... 46
4.1.4 Generating Output Trigger Signals ....................................................................................... 47
4.2 Operating Scan Traces ........................................................................................................................ 48
4.2.1 Setting Trace Types ............................................................................................................... 49
4.2.2 Displaying/Hiding/Activating Traces.................................................................................... 50
4.2.3 Copying/Pasting Trace Data ................................................................................................. 50
4.2.4 Saving/Loading Traces.......................................................................................................... 51
4.3 Handling Traces Files .......................................................................................................................... 53

Table of Contents
6OSA20 User Guide
5. Adjusting the Graph Display .............................................................................................................. 55
5.1 Adjusting the Scale of the Graph With Zoom Commands ................................................................ 55
5.2 Performing Manual Measurements With Markers ............................................................................ 57
6. Analyzing Traces .............................................................................................................................. 59
6.1 Setting Up Peaks and Troughs Search ............................................................................................... 64
6.1.1 Defining PT Search Analysis Parameters............................................................................. 64
6.1.2 Analyzing PT Search Results ................................................................................................ 66
6.2 Selecting the Component Under Test (PCT Mode) ........................................................................... 67
6.3 Setting Up Channel Detection ............................................................................................................. 68
6.3.1 Defining Channel Detection Analysis Parameters............................................................... 68
6.3.2 Analyzing WDM Channel Detection Results......................................................................... 71
6.4 Setting Up Spectral Width Analysis .................................................................................................... 73
6.4.1 Defining Spectral Width Analysis Parameters ..................................................................... 73
6.4.2 Analyzing Spectral Width Results ......................................................................................... 76
6.5 Setting Up XXdB Width Analysis ......................................................................................................... 77
6.5.1 Defining XXdB Width Analysis Parameters.......................................................................... 77
6.5.2 Analyzing XXdB Width Results.............................................................................................. 79
6.6 Setting Up λmean Analysis ................................................................................................................. 80
6.6.1 Defining λmean Analysis Parameters .................................................................................. 80
6.6.2 Analyzing λmean Results ...................................................................................................... 81
6.6.3 Analyzing λpeak Results ....................................................................................................... 81
6.7 Analyzing λcenter and σResults......................................................................................................... 82
6.8 Analyzing FWHM Results .................................................................................................................... 83
6.9 Analyzing Side Modes Spacing Analysis............................................................................................ 84
6.10 Setting Up Notch Width Analysis ........................................................................................................ 85
6.10.1 Defining Notch Width Analysis Parameters......................................................................... 85
6.10.2 Analyzing Notch Width Results............................................................................................. 87
6.11 Setting Up Level Check Analysis......................................................................................................... 88
6.11.1 Defining Level Check Analysis Parameters.......................................................................... 88
6.11.2 Analyzing Level Check Results ............................................................................................. 89
6.12 Setting Up SMSR Analysis................................................................................................................... 90
6.12.1 Defining SMSR Analysis Parameters.................................................................................... 90
6.12.2 Analyzing SMSR Results........................................................................................................ 91
6.13 Setting Up OSNR Analysis ................................................................................................................... 93
6.13.1 Defining OSNR Analysis Parameters.................................................................................... 93
6.13.2 Analyzing OSNR Results........................................................................................................ 97
6.14 Setting Up Ripple Analysis................................................................................................................... 99
6.14.1 Defining Ripple Analysis Parameters ................................................................................... 99
6.14.2 Analyzing Ripple Results ..................................................................................................... 100
6.15 Setting Up Optical Power Analysis ................................................................................................... 101
6.15.1 Defining Optical Power Analysis Parameters .................................................................... 101
6.15.2 Analyzing Optical Power / Gain / Loss Results ................................................................. 102
6.16 Setting Up Loss Measurement Analysis........................................................................................... 103

Table of Contents
OSA20 User Guide 7
6.16.1 Defining Loss Measurement Analysis Parameters ........................................................... 103
6.16.2 Analyzing Loss Measurement Results ............................................................................... 103
6.17 Setting Up Peak Power Density Analysis ......................................................................................... 104
6.17.1 Defining Peak Power Density Analysis Parameters .......................................................... 104
6.17.2 Analyzing Peak Power Density Results .............................................................................. 104
6.18 Setting Up Gain and Noise Figure Analysis...................................................................................... 105
6.18.1 Defining Gain & NF Analysis Parameters ........................................................................... 105
6.18.2 Analyzing Gain and NF Results ........................................................................................... 107
6.19 Setting Up Pass Band Test Analysis................................................................................................. 109
6.19.1 Defining Pass Band Test Analysis Parameters ................................................................. 109
6.19.2 Analyzing Pass Band Test Results ..................................................................................... 113
6.20 Setting Up Stop Band Test Analysis ................................................................................................. 114
6.20.1 Defining Stop Band Test Analysis Parameters .................................................................. 114
6.20.2 Analyzing Stop Band Test Results...................................................................................... 118
6.21 Setting Up Mask Test Analysis ......................................................................................................... 119
6.21.1 Defining Mask Test Analysis Parameters .......................................................................... 119
6.21.2 Analyzing Mask Test Results .............................................................................................. 120
7. Saving/Loading Configuration Settings and Handling Files.............................................................. 121
7.1 Saving Analysis Settings and Results............................................................................................... 121
7.2 Loading Measurement and Analysis Settings ................................................................................. 122
7.3 Handling Files Saved ......................................................................................................................... 123
8. Using the OSA20 in Remote Control ................................................................................................ 125
8.1 Preparing the OSA20 for Remote Control ........................................................................................ 125
8.1.1 Modifying the GPIB Address ............................................................................................... 125
8.1.2 Setting the Ethernet Ports ................................................................................................... 125
8.1.3 Installing the USB Driver on the Remote Computer........................................................... 128
8.2 Entering the Remote Mode................................................................................................................ 129
8.3 Switching Back to Local Mode.......................................................................................................... 129
9. Performing Basic Maintenance Operations...................................................................................... 131
9.1 Updating the OSA20 Firmware Version............................................................................................ 131
9.2 Cleaning the OSA20 ........................................................................................................................... 132
9.2.1 Cleaning the Cover of the OSA20........................................................................................ 132
9.2.2 Cleaning the Fan Grid .......................................................................................................... 132
9.2.3 Cleaning the Multi-touch Screen......................................................................................... 133
9.3 Replacing the External Power Fuse .................................................................................................. 133
9.4 Cleaning Optical Connectors............................................................................................................. 134
9.5 Calibrating the OSA20 ....................................................................................................................... 136
9.5.1 Performing a User Calibration............................................................................................. 136
9.5.2 Asking for a Factory Recalibration...................................................................................... 136
9.6 Carrying the OSA20............................................................................................................................ 137
9.7 Packaging for Shipment .................................................................................................................... 137
10. Troubleshooting.............................................................................................................................. 139

Table of Contents
8OSA20 User Guide
10.1 Handling Errors and Warnings .......................................................................................................... 139
10.1.1 Dealing with System Error Messages................................................................................. 139
10.1.2 Dealing with File Handling Error Messages ....................................................................... 141
10.1.3 Dealing with User Calibration Error Messages .................................................................. 141
10.1.4 Dealing with Trace Analysis Warning Messages............................................................... 143
10.1.5 Forcing the OSA20 to Shutdown & Restart ........................................................................ 143
10.2 Using Remote Assistance Tools....................................................................................................... 144
10.2.1 Performing a Self-test.......................................................................................................... 144
10.2.2 Sending Debug Data to EXFO Support Service .................................................................. 144
Certification and Compliance ................................................................................................................. 145
Table of Figures ..................................................................................................................................... 147

OSA20 User Guide 9
Important Safety Information for Your Product
Before you start working with your device, you need to first read the important safety
information provided in this section. This section provides information that may
supplement or add safety information to the user guides of your product. Keep this
information close at hand.
You can obtain a copy of the complete user guide for your product at the following link:
www.EXFO.com
Product Safety Safety Symbols on Your Product
One or more of the following symbols may appears on your product.
Electrical Safety Information
This unit uses an international safety standard three-wire power cable. This cable serves
as a ground when connected to an appropriate AC power outlet.
Important
•If you see the symbol on your unit, make sure that you refer to
the instructions provided in this safety notice. Ensure that you
understand and meet the required conditions before using your
product.
•Other safety instructions relevant for your product are located
throughout this documentation, depending on the action to perform.
Make sure to read them carefully when they apply to your situation.
Symbol Meaning
Direct current
Alternating current
The product is equipped with an earth (ground) terminal.
The product is equipped with a protective conductor terminal.
The product is equipped with a frame or chassis terminal.
On (Power)
Off (Power)
or
On/Off (Power)
Fuse

Important Safety Information for Your Product
10 OSA20 User Guide
Warning
•The use of voltages higher than those indicated on the label affixed to
your unit may damage the unit.
•The use of controls, adjustments and procedures, namely for operation
and maintenance, other than those specified herein may result in
hazardous radiation exposure or impair the protection provided by this
unit.
•If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
•Use only accessories designed for your unit and approved by EXFO. For
a complete list of accessories available for your unit, see its technical
specifications or contact EXFO.
•Where applicable, use only the listed and certified AC adapter provided
by EXFO with your unit. It provides reinforced insulation between primary
and secondary, and is suitably rated for the country where the unit is
sold.
•Use only the certified power cord that is suitably rated for the country
where the unit is used. Replacing detachable mains supply cords by
inadequately rated cords, may result in overheating of the cord and
create a fire risk.
•Your unit is equipped with an internal replaceable clock battery to keep
time and date accurate. Only authorized personnel can replace this
battery. Attempting to replace it yourself could seriously compromise
your safety.
•Unless otherwise specified, all interfaces are intended for connection to
Safety Extra Low Voltage (SELV) circuits only.
•To avoid electrical shock, do not operate the unit if any part of the outer
surface (covers, panels, etc.) is damaged.
•Operation of any electrical instrument around flammable gases or fumes
constitutes a major safety hazard.
•Only authorized personnel should carry out adjustments, maintenance or
repair of opened units under voltage. A person qualified in first aid must
also be present. Do not replace any components while the power cable
are connected.
•Use only the listed and certified AC adapter/charger provided by EXFO
with your unit. It provides reinforced insulation between primary and
secondary, and is suitably rated for the country where the unit is sold.
•Use only fuses with the required rated current and specified type. Do not
use repaired fuses or short-circuited fuse holders. For more information,
see the section about replacing the fuses in this user documentation.
Caution
•Where applicable, the operation and storage temperatures, as well as the
altitude and relative humidity values of some modules may differ from
those specified for your platform. In this case, always ensure that you
comply with the most restrictive conditions (either module or platform).
•When using the unit while connected to the AC/DC adapter/charger,
make sure you do not position the equipment so that it is difficult to
disconnect the adapter/charger from the AC mains.
•Position the unit so that the air can circulate freely around it.

Important Safety Information for Your Product
OSA20 User Guide 11
Optical Safety Safety Symbols on Your Product
Optical Safety Instructions
Your instrument is in compliance with standards IEC 60825-1: 2007 and 2014.
Laser radiation may be encountered at the optical output port.
The following label indicates that a product contains a Class 1 source:
Complies with standards 21 CFR 1040.10, except for deviations pursuant to Laser Notice
No. 50, dated June 24, 2007.
Gas Safety The OSA20 contains acetylene gas in a sealed cell of less than 2 cm3.
Symbol Meaning
This symbol on your product indicates that the unit is equipped with a
laser source, or that it can be used with instrument equipped with a
laser source. These instruments include but are not limited to,
modules and external optical units.
Warning
•Do not install or terminate fibers while a light source is active.
•Never look directly into a live fiber and ensure that your eyes are
protected at all times.
CLASS 1
LASER PRODUCT
APPAREIL À LASER
DE CLASSE 1

Important Safety Information for Your Product
12 OSA20 User Guide

OSA20 User Guide 13
1. Product Presentation
The OSA20 is a diffraction-grating based optical spectrum analyzer, using a touch
sensitive display with multi-touch gesture control. It provides an extensive suite of built-
in analysis functions enabling input signal measurement and analysis for many common
applications.
A wide range of communication ports allows remote control operations and export of
data.
The OSA20 features one general analysis mode and seven application-oriented modes.
Each analysis mode has a full suite of analysis functions for a detailed spectrum
analysis.
1.1 Technical Specifications
Measurement
Spectral Measurement
Spectral Range 1250–1700 nm / 239.834–176.349 THz
Span Range 0.5 nm to full range (450 nm)
Linearity*1 ±6 pm over 1500–1640 nm, ±20 pm over full range / 2.5 GHz @
1550 nm
Accuracy*1 ±10 pm over 1500–1640 nm, ±25 pm over full range / 2.5 GHz
@ 1550 nm
Repeatability ±2 pm / 0.25 GHz @ 1550 nm
Sampling Resolution 2 pm / 0.25 GHz @ 1550 nm
Sampling Points 251 (span of 0.5 nm) to 225,001 (span of 450 nm)
Reference Built-in ELED (safety class 1) + Acetylene cell (user calibration
by patch cord)
Acetylene gas is a NIST standard Reference Material SRM
2517a. The P9 line is used in the case of OSA20
Optical Power
Input Power per Channel ≤20 dBm
Total Safe Power ≤25 dBm
Level
Sensitivity*2
single scan High (0.5 nm/s): < -76 dBm (-78 dBm typ.)
with averaging
(Avg Nb of
scans)*3
High (0.5 nm/s): -80 dBm (Avg 3), -85 dBm (Avg 30), -90 dBm
(Avg 380)
-75 dBm (2 nm/s): -80 dBm (Avg 7), -85 dBm (Avg 70), -90 dBm
(Avg 800)
Absolute Level Accuracy*1,*4 ±0.4 dB at 1310 nm and 1550 nm
Level Linearity*5 ±0.07 dB over the full range (input level -50 to +3 dBm)
Level/Wavelength Flatness*6 ±0.15 dB over 1500–1640 nm, ±0.25 dB over 1260–1680 nm
Level Sampling ±0.01 dB over -60 to +20 dBm

Product Presentation
14 OSA20 User Guide
Interfaces &
Electrical
Monochromator
Resolution Bandwidth*7*8*9 20 pm native, adjustable over 50–2000 pm with 1 pm step
Dynamic Range (ORR)*10 ≥30 dB (> 35 dB typ.) beyond ±50 pm from peak
≥50 dB (> 55 dB typ.) beyond ±100 pm from peak
≥60 dB (> 63 dB typ.) beyond ±200 pm from peak
Stray Light Suppression
ratio*11 ≥73 dB
Scan Speed
Sensitivity*2 -55dBmat2000nm/sto-75dBmat2nm/s
Sweep Cycle/100 nm*12 300 ms typ.
Sampling Rate 1 MHz typ.
*1: After user calibration performed after 1 hour warm-up time.
*2: Noise level of 99 % of all data points over 1520–1620 nm.
*3: Typical values.
*4: Over 18–28°C all sensitivity settings except ±0.6 dB in -55 dBm and Burst sensitivities.
*5: Measured @ 1310 nm & 1500 nm, except ±0.3 dB in -55 dBm and Burst sensitivities.
*6: Except ±0.35 dB in -55 dBm and Burst sensitivities, except for water absorption lines, over 18–28°C
all sensitivity settings.
*7: Native 17–24 pm over 1500–1620 nm (except in -55 dBm sensitivity), 17–26 pm over 1250–
1700 nm.
*8: Adjustable resolution bandwidth is calculated from the native bandwidth.
*9: Adjustable over 6–400 GHz with 0.1 GHz step on the abscissa in THz.
*10: HeNe laser at 1523 nm with ±2 nm span.
*11: Laser at 1523 nm with ±50 nm span, excluding ±2 nm around peak.
*12: Sweep cycle /100 nm at -60 dBm sensitivity at center wavelength of 1475 nm.
Optical Interfaces
Optical Input SMF-28 type fiber
User Calibration Output Built-in ELED (safety class 1) + Acetylene cell (user
calibration by patch cord)
Connector (Input and Output) FC/APC or FC/PC or SC/APC or SC/PC
Return Loss > 38 dB (> 42 dB typ.) at 1310 nm and at 1550 nm (APC
connector)
External Devices
Screen VGA Port (x1), DVI-D Port (x1), HDMI (x1)
Mouse, keyboard, hard disk... USB 2.0-A (x4), USB 3.0-A (x2)
Serial Ports (unused) Male SUBD-9 (x2)
Sound Ports (unused) Line-in (x1), Line-out (x1), Microphone (x1)
Remote Interfaces
Ethernet (2x RJ45) 1 Gb/s max.
GPIB (1x IEEE 488) 7.2 Mb/s max.
USB (1x USB 2.0-B) 115 kb/s max.
Triggers
Trigger In (BNC) •High level: >3 V
•Low level: <2 V
•Input maximum range: 0–5.5 V
Trigger Out (BNC) •
High level: 4.5 to 5 V on high-impedance load (>10 kΩ)
• Low level: 0 to 0.5 V on high-impedance load (>10 kΩ)

Product Presentation
OSA20 User Guide 15
Environmental &
Physical
The validity of specifications depends on operating conditions. For more details, see
section Calibrating the OSA20, p. 136.
Electrical Specifications
Unit Input power 48 V ; 3 A (protected by fuse)
Fuse Type 3.15 A, Fast-acting, Low-breaking, 250 V, Ø5x20 mm
Internal clock
battery 3V CR2032 (replacement by service personnel only)
AC/DC
Adapter Input Power 100–240 V , 50/60 Hz, 1.5 A
Output Power 48 V , 3.13 A
Environmental Specifications
Equipment Type Test and Measurement
Equipment Location Indoor use only
Safety Class Basic insulation, as defined in IEC-61010-1. Grounded
product.
Overvoltage Category Category II
Local-level mains (wall sockets). Equipment at this
level includes appliances, portable tools, and similar
products. Equipment is usually cord-connected.
Pollution Degree Degree 2
Normally only dry, non-conductive pollution occurs.
Occasional and temporary conductivity caused by
condensation may occur. This location is a typical
office/home environment. Temporary condensation
occurs only when the product is left unused.
Safe Operating Temperature
Range
+5 °C to +40 °C, +41 °F to +104 °F
(scan stop if temperature > 35°C: see section Error
Code -1003, p. 139)
Performance Guaranteed
Temperature Range
+18 °C to +28 °C, +64.4 °F to +82.4 °F
Storage Temperature Range -10 °C to +50 °C, +14 °F to +122 °F
Maximum Relative Humidity 80 % for temperatures up to 31°C decreasing linearly to
50 % relative humidity at 40°C
Altitude (maximum operating) 2000 m
Physical Specifications
Display Screen 12 inch capacitive touch-screen (res. 1024 x 768)
Data Storage Capacity 18 GB
Dimensions & Weight W 413 x H 314 x D 385 mm, 15 kg
Available Accessory Rack mount kit

Product Presentation
16 OSA20 User Guide
1.2 Product Overview
The OSA20 is delivered with the following accessories:
•1 front panel protective cover
•1 power supply cord
•1 AC/DC power adapter (fastened on the rear panel)
•1 jumper (for user calibration)
•1 capacitive touch screen stylus
•1 manual Getting Started with OSA20
•1 USB key containing the firmware version installed on the OSA20 and the available
drivers, examples, reports and user documentation.
1.2.1 Front Panel
The OSA20 is delivered with a protective cover fastened on the front panel.
Figure 1: Front Panel
On/Off button
The label identifies the On/Off button that enables you to turn on or off the OSA20
(see section Turning on/off the OSA20 and Accessing an Analysis Mode, p. 31).
Multi-touch Screen
The multi-touch screen enables you to perform all possible operations on the OSA20.
To select a parameter, command or function on the screen, touch the corresponding
command with the tip of your finger or the stylus, without tapping it.
USB 2.0-A port
Multi-touch screen
On/Off button
Optical connectorsConnector’s plate

Product Presentation
OSA20 User Guide 17
The following gestures are available on the multi-touch screen:
USB ports
The label identifies the two USB 2.0 type-A ports located on the front panel.
They enable you to connect USB devices such as:
•Keyboard and mouse if needed (see section Connecting USB Devices to the OSA20,
p. 28)
•USB key or hard disk to export your measurement results
•An external multi-touch screen
The USB ports are SELV classified; you must only connect them to interfaces of the same
type.
Optical Connectors
The two following optical connectors, protected by a dust cap, are located on the front
panel:
•The Calibration Output label identifies the ELED and acetylene source output, used
for user calibration of the wavelength (see section Calibrating the OSA20, p. 136).
The label indicates an injury hazard. The user calibration output requires
special safety instructions for proper use: see section Calibrating the OSA20, p. 136.
•The Optical Input label identifies the optical input, used to connect a light source.
The two optical connectors are mounted on a plate, which enables you to access the
internal optical connectors for cleaning (see section Performing Basic Maintenance
Operations, p. 131).
Gesture Description
Touch Gently touch something on the screen with your finger or the stylus to
select it.
Pan Drag your finger or the stylus across the screen.
Pinch/Stretch Pinch two fingers together or move them apart to zoom in or out:
•To zoom in, touch two points on the screen and move your
fingers away from each other.
•To zoom out, touch two points on the screen and move your
fingers toward each other.
Long press Hold your finger or stylus on the graph until a complete circle appears
around it to automatically activate the rectangle zoom (see section
Adjusting the Scale of the Graph With Zoom Commands, p. 55).

Product Presentation
18 OSA20 User Guide
1.2.2 Left-side Panel: Cooling Fan
The cooling fan, located on the left-side panel of the OSA20, extracts warm air from
inside. A cover grid protects it.
Figure 2: Left-side panel – Cooling Fan
Cooling Fan

Product Presentation
OSA20 User Guide 19
1.2.3 Right-side Panel: Connectors
The right-side panel of the OSA20 contains:
•A complete set of communication ports and interfaces for remote control and export
of data.
All ports and interfaces are SELV classified and must only be connected to
interfaces of the same type.
•Ventilation holes for air input.
Figure 3: Right-side panel – Connectors
External Screen Connectors
You can connect an external screen to the following ports:
•VGA port
•DVI port
•HDMI port
For more details on how to configure the external screen settings, see section Sharing
the OSA20 Display with an External Screen, p. 29.
Trigger Ports
The trigger ports enable you to synchronize scans with a signal (see section Interfaces &
Electrical, p. 14 for more details on signal levels).
•TRIG OUT: BNC connector for outputting trigger signals. For more details, see
section Generating Output Trigger Signals, p. 47.
Ventilation Holes
Trigger IN
Ethernet Port #2
USB 2.0-B port
Serial Ports (x2)
(unused)
VGA Port
DVI Port
HDMI Port
Screen
Connectors
USB 3.0-A Ports (x2)
USB 2.0-A Ports (x2)
Audio Ports
(unused)
Ethernet Port #1
Trigger OUT

Product Presentation
20 OSA20 User Guide
•TRIG IN: input BNC connector for starting scan in synchronization with an external
trigger signal, as described in section Triggering the Optical Spectrum Acquisition,
p. 46.
In RLT mode, this port is used as a gate: see paragraphs RLT – Recirculating Loop
Transmission, p. 35 and Gate Acquisition (RLT mode only), p. 43.
USB Ports
•USB 2.0-A and USB 3.0-A: these ports enable you to connect USB devices such as:
•Keyboard and mouse if needed (see section Connecting USB Devices to the
OSA20, p. 28)
•USB key or hard disk to export your measurement results
•An external multi-touch screen
The USB ports are SELV classified; you must only connect them to interfaces of the
same type.
•USB 2.0-B: this port enables you to perform remote control operations from a
connected computer. For more information, see section Using the OSA20 in Remote
Control, p. 125.
Ethernet Ports
The two Ethernet ports enable you to perform remote control operations.
•Ethernet port #1:
This port is associated with a DHCP server. It can be used to connect directly a
computer that will be assigned automatically an IP address.
•Ethernet port #2:
You can configure this port manually or automatically through a remote DHCP
server.
For more information, section Using the OSA20 in Remote Control, p. 125.
Audio and Serial Ports
Unused ports.
Important
The Ethernet ports can only be used for remote control of the OSA20. Any
other use is not possible.