YOKOGAWA AQ6376 User manual

User’s
Manual AQ6376
Optical Spectrum Analyzer
IM AQ6376-01EN
2nd Edition

i
IM AQ6376-01EN
Thank you for purchasing the AQ6376 Optical Spectrum Analyzer. This instrument
enables high speed measurement of the optical properties of LD and LED light sources,
optical amps, and other devices. To improve ease of use, it includes mouse-based user
operation and a brand-new zoom function.
This getting started guide describes the instrument’s functions, operating procedures,
and handling precautions, and provides other important information for use of the
instrument. For correct operation, please read this manual thoroughly before use. After
reading this manual, keep it in a convenient location for quick reference in the event a
question arises during operation. There are four manuals for theAQ6376 including this
one. Read them along with this manual.
List of Manuals Manual Title Manual No. Description
AQ6376 Optical Spectrum
Analyzer
User’s Manual
IM AQ6376-01EN This manual. The manual is located on the CD
included in your package (pdf format). Explains
all functions and operating procedures of the
AQ6376 except remote control and program
functions.
AQ6376 Optical Spectrum
Analyzer Remote Control
User’s Manual
IM AQ6376-17EN The manual is located on the CD included in
your package (pdf format). Explains functions for
controlling the instrument with communication
commands and program functions.
AQ6376 Optical Spectrum
Analyzer Getting Started
Guide
IM AQ6376-02EN Provided as a printed manual.
This guide explains the handling precautions,
basic operations, and specifications of the
AQ6376.
AQ6376 Optical Spectrum
Analyzer IM AQ6376-92Z1 A document for China.
The “-EN” in the manual number is the language code.
Contact information of Yokogawa offices worldwide is provided on the following sheet.
Document Description Description
PIM 113-01Z2 List of worldwide contacts
Notes
• Thecontentsofthismanualaresubjecttochangewithoutpriornoticeasaresult
of improvements in the instrument’s performance and functions. Display contents
illustrated in this manual may differ slightly from what actually appears on your screen.
• Everyefforthasbeenmadeinthepreparationofthismanualtoensuretheaccuracy
of its contents. However, should you have any questions or find any errors, please
contact your nearest YOKOGAWAdealer.
• Copyingorreproducingalloranypartofthecontentsofthismanualwithoutthe
permission of Yokogawa Test & Measurement Corporation is strictly prohibited.
Trademarks
• MicrosoftandWindowsaretrademarksorregisteredtrademarksofMicrosoft
Corporation in the United States and/or other countries.
• AdobeandAcrobataretrademarksorregisteredtrademarksofAdobeSystems
incorporated.
• Thecompanyandproductnamesusedinthismanualarenotaccompaniedbythe
trademark or registered trademark symbols (TM, ®)
• Othercompanyandproductnamesaretrademarksorregisteredtrademarksoftheir
respective companies.
2nd Edition : October 2017 (YMI)
All Rights Reserved, Copyright © 2016 Yokogawa Test & Measurement Corporation

ii IM AQ6376-01EN
Revisions
• 1stEdition: April2016
• 2ndEdition: October2017

iii
IM AQ6376-01EN
Symbols and Notation Used in This Manual
Safety Markings
The following markings are used in this manual.
Improperhandlingorusecanleadtoinjurytotheuserordamageto
the instrument. This symbol appears on the instrument to indicate
that the user must refer to the user's manual for special instructions.
The same symbol appears in the corresponding place in the user's
manual to identify those instructions. In the manual, the symbol is
usedinconjunctionwiththeword“WARNING”or“CAUTION.”
WARNING Calls attention to actions or conditions that could cause serious or
fatalinjurytotheuser,andprecautionsthatcanbetakentoprevent
such occurrences.
CAUTION Callsattentionstoactionsorconditionsthatcouldcauselightinjuryto
the user or damage to the instrument or user’s data, and precautions
that can be taken to prevent such occurrences.
French
AVERTISSEMENT Attire l’attention sur des gestes ou des conditions susceptibles
de provoquer des blessures graves (voire mortelles), et sur les
précautions de sécurité pouvant prévenir de tels accidents.
ATTENTION Attire l’attention sur des gestes ou des conditions susceptibles de
provoquer des blessures légères ou d’endommager l’instrument ou les
données de l’utilisateur, et sur les précautions de sécurité susceptibles
de prévenir de tels accidents.
Note Calls attention to informn that is important for proper operation of the
instrument.
on that is important for proper operation of the instrument.

iv IM AQ6376-01EN
Notations Used on Pages Describing Operating Procedures
On pages that describe the operating procedures in Chapter 3 through 11, the following
notations are used to distinguish the procedures from their explanations.
Procedure This subsection contains the operating procedure used to carry out
the function described in the current chapter. All procedures are
written with inexperienced users in mind; experienced users may not
need to carry out all the steps.
Explanation This subsection describes the setup parameters and the limitations on
the procedures. It may not give a detailed explanation of the function.
For a detailed explanation of the function, see chapter 2.
Notations Used in the Procedures
Panel Keys and Soft keys
Bold characters used in the procedural explanations indicate characters that are marked on the
panel keys or the characters of the soft keys displayed on the screen menu.
Unit
k: Denotes “1000.” Example: 100kS/s
K: Denotes “1024.” Example: 459KB (file data size)
Symbols and Notation Used in This Manual

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IM AQ6376-01EN
Flow of Operation
The figure below is provided to familarize the first-time user with the general flow of this
instrument operation. For a description of each item, see the relevant section or chapter.
Preparing for Measurement
Setting Conditions and Measuring
Waveform Display
Alignment Adjustment
Wavelength Calibration
Purging
Auto Sweep Setting and Measurement
Other Settings
Waveform Display
Displaying Calculated Waveforms
Marker Display
Searching
Waveform Analysis
Waveform Analysis
GO/NO-GO Judgment
Saving Display Data and Printing Out
Storage Media
Saving Data
Section 2.1
Section 2.2
Section 2.3
Section 4.1
Section 4.2 to 4.11
Section 5.1 to 5.4
Section 5.5
Section 5.9
Section 5.13 to 5.14
Section 6.1 to 6.9
Section 6.12
Section 7.1
Section 7.2 to 7.8
Measurement Start (Sweep)
External Trigger Measurement Section 4.12
Section 4.15

vi IM AQ6376-01EN
2.1 to 2.3, 7.3 to 7.11, 9.7
Contents
Symbols and Notation Used in This Manual....................................................................................iii
Flow of Operation..............................................................................................................................v
Chapter 1 Functions
1.1 System Structure.............................................................................................................. 1-1
1.2 Measurement ................................................................................................................... 1-2
1.3 Waveform Display ........................................................................................................... 1-7
1.4 Analysis.......................................................................................................................... 1-12
1.5 Other .............................................................................................................................. 1-14
Chapter 2 Preparing for Measurement
2.1 AlignmentAdjustment....................................................................................................... 2-1
2.2 Wavelength Calibration .................................................................................................... 2-4
2.3 Purge................................................................................................................................ 2-8
2.4 Important Points During Measurement........................................................................... 2-12
Chapter 3 Common Operations
3.1 Description of Soft Keys................................................................................................... 3-1
3.2 Using the Mouse and External Keyboard......................................................................... 3-3
3.3 Entering Numerical Values and Strings............................................................................ 3-5
3.4 Screen Display................................................................................................................. 3-7
3.5 Setting the Date and Time................................................................................................ 3-8
Chapter 4 Measurement
4.1 Auto Measurement........................................................................................................... 4-1
4.2 Horizontal/Vertical Axis Settings....................................................................................... 4-2
4.3 Sub Scale......................................................................................................................... 4-7
4.4 Setting the Reference Level............................................................................................4-11
4.5 Center Wavelength (Center Frequency / Center Wavenumber) Setting........................ 4-15
4.6 Sweep Width Settings.................................................................................................... 4-21
4.7 Wavelength (Frequency / Wavenumber) Resolution Settings........................................ 4-25
4.8 Sampling Point/Interval Settings .................................................................................... 4-27
4.9 Sensitivity Settings......................................................................................................... 4-29
4.10 Sweep Speed Settings................................................................................................... 4-31
4.11 Averaging Times Setting................................................................................................. 4-32
4.12 Trace Settings ................................................................................................................ 4-33
4.12 Measurement Start (Sweep) .......................................................................................... 4-35
4.14 Specifying a Sweep Range............................................................................................ 4-37
4.15 Pulse Light Measurement............................................................................................... 4-38
4.16 External Trigger Measurement....................................................................................... 4-43
4.17 Trigger Output ................................................................................................................ 4-47
4.18 Smoothing...................................................................................................................... 4-48
4.19 Analog Out ..................................................................................................................... 4-49

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IM AQ6376-01EN
2.1, 2.4, 2.6, 2.7, 9.6
Chapter5 Waveform Display
5.1 Zooming In/Out on Waveforms......................................................................................... 5-1
5.2 Wavelength Updating/Fixing............................................................................................. 5-8
5.3 MAX/MIN HOLD Display................................................................................................ 5-10
5.4 Sweep Average ...............................................................................................................5-11
5.5 Displaying Calculated Waveforms.................................................................................. 5-13
5.6 Normalized Display ....................................................................................................... 5-18
5.7 Curve Fitting .................................................................................................................. 5-19
5.8 Power Density Trace..................................................................................................... 5-25
5.9 Marker Display ............................................................................................................... 5-26
5.10 Displaying a Split Screen ............................................................................................... 5-44
5.11 Noise Mask..................................................................................................................... 5-46
5.12 Copying and Clearing Traces......................................................................................... 5-48
5.13 Single Search................................................................................................................. 5-50
5.14 Multi Search ................................................................................................................... 5-54
Chapter 6 Analysis
6.1 Spectrum Width Measurement......................................................................................... 6-1
6.2 Notch Width Measurement............................................................................................... 6-4
6.3 SMSR Measurement........................................................................................................ 6-6
6.4 POWER Measurement..................................................................................................... 6-8
6.5 DFB-LD, FP-LD, and LED Measurement......................................................................... 6-9
6.6 PMD Measurement ........................................................................................................ 6-10
6.7 WDM Transmission Signal Analysis (Except Wavenumber Mode) ................................ 6-12
6.8 Optical Amp Gain and NF Measurement (Except Wavenumber Mode)......................... 6-19
6.9 Optical Filter Characteristics Measurement (Except Wavenumber Mode)..................... 6-26
6.10 Editing the Grid Table (Except Wavenumber Mode) ...................................................... 6-35
6.11 Measurement of Level Fluctuations in Single-Wavelength Light (0 nm Sweeping)........ 6-39
6.12 Go/No-Go Judgment (Template) .................................................................................... 6-42
6.13 Specifying an Analysis Range........................................................................................ 6-54
6.14 Correcting Displayed Values .......................................................................................... 6-57
6.15 Analysis Data Logging.................................................................................................... 6-60
Chapter 7 Saving/Loading Data
7.1 USB Storage Media.......................................................................................................... 7-1
7.2 Temporarily Saving and Redisplaying Traces to and from Internal Memory.................... 7-2
7.3 Saving/Loading Displayed Data ....................................................................................... 7-6
7.4 Saving/Loading Displayed Data(All Trace)..................................................................... 7-22
7.5 Saving/Loading Setting Data.......................................................................................... 7-28
7.6 Saving/Loading Analysis Results Data........................................................................... 7-33
7.7 Saving/Loading Program Data ....................................................................................... 7-41
7.8 Saving Screen Image Data ............................................................................................ 7-47
7.9 Saving/Loading Template Data....................................................................................... 7-51
7.10 Saving and Loading Logging Data ................................................................................. 7-57
7.11 Creating Files ................................................................................................................. 7-63
1
2
3
4
5
6
7
8
9
App
Index
Contents

viii IM AQ6376-01EN
2.1 to 2.3, 7.3 to 7.11, 9.7
Chapter 8 Other Operations
8.1 Registering Soft keys ....................................................................................................... 8-1
8.2 Data Initialization.............................................................................................................. 8-2
8.3 Help................................................................................................................................ 8-17
8.4 Registering and Loading Character Strings ................................................................... 8-18
8.5 Locking Keys.................................................................................................................. 8-19
8.6 Other Settings ................................................................................................................ 8-21
8.7 Displaying System Information....................................................................................... 8-26
Chapter 9 Maintenance
9.1 Updating the Firmware..................................................................................................... 9-1
9.2 Mechanical Inspection...................................................................................................... 9-4
9.3 Operational Inspection ..................................................................................................... 9-5
9.4 Inspection of Wavelength Accuracy.................................................................................. 9-6
9.5 Inspection of Level Accuracy............................................................................................ 9-7
9.6 Replacing Fuses............................................................................................................... 9-8
9.7 Daily Maintenance............................................................................................................ 9-9
9.8 Care during Storage........................................................................................................9-11
9.9 Recommended Replacement Parts ............................................................................... 9-12
9.10 Warning Display Function............................................................................................... 9-13
Appendix Appendix 1 GRID Table for WDM Wevelength......................................................................App-1
Appendix 2 Data Calculation Algorithms for Spectrum Widths .............................................App-2
Appendix 3 Details of Each Analytical Functions................................................................App-11
Appendix 4 Detailed Explanations of WDM Analysis Function ...........................................App-19
Appendix5 DetailsofOpticalAmplierAnalysisFunction ..................................................App-30
Appendix 6 Details of Optical Filter Analysis Function........................................................App-33
Appendix 7 Soft Key Tree Diagram.....................................................................................App-50
Appendix 8 END USER LICENSE AGREEMENT...............................................................App-69
Index
Contents

1-1
IM AQ6376-01EN
Functions
1
2
3
4
5
6
7
8
9
10
11
App
Index
Chapter 1 Functions
1.1 System Structure
System Structure
Control target
GP-IB interface
RS-232 interface
Ethernet interface
PC
Video signal output
trigger output
Analog output
External trigger input
USB mouse
USB keyboard
USB storage
medium
USB mouse
USB storage
medium USB 101 keyboard
AQ6376
1500 ~ 3400 nm
USB
POWER
FUNCTION DATA ENTRY
CENTER
SWEEP
SPAN LEVEL
ZOOM
SETUP
MARKER
DISPLAY
PEAK
SEARCH
TRACE
ANALYSIS
USER MEMORY FILE
SYSTEM
ADVANCE
PROGRAM
OREMOTE
UNDO/
LOCAL
HELP
COPY PRESET
COARSE
789
456
123
0
.
-
BACK
SPASE
nm/
ENTER
m/
ENTER
OPTICAL INPUT
(600 1700nm)
CALIBRATION
OUTPUT
OPTICALSPECTRUM ANALYZER
Purge gas charge/discharge