YOKOGAWA AQ6375 User manual

User’s
Manual AQ6375
Optical Spectrum Analyzer
Getting Started Guide
IM AQ6375-02EN
3rd Edition

Product Registration
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form accessible from our homepage.
http://tmi.yokogawa.com/
PIM 103-03E

iii
IM AQ6375-02EN
Foreword
Thank you for purchasing the AQ6375 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 three manuals for the AQ6375 including this
one. Read them along with this manual.
Manual Title Manual No. Description
AQ6375 Optical
Spectrum Analyzer
User’s Manual
IM AQ6375-01EN The manual is located on the CD included
in your package (pdf format). Explains all
functions and operating procedures of the
AQ6370C except remote control and program
functions.
AQ6370C/AQ6373/
AQ6375 Optical
Spectrum Analyzer
Remote Control User’s
Manual
IM AQ6370C-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.
AQ6375 Optical
Spectrum Analyzer
Getting Started Guide
IM AQ6375-02EN This manual. Explains instrument handling
precautions and basic operating procedures.
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 YOKOGAWA dealer.
• Copying or reproducing all or any part of the contents of this manual without the
permission of Yokogawa Meters & Instruments Corporation is strictly prohibited.
• A warranty sheet is included. It cannot be reissued. After reading the sheet, keep it in
a safe location.
Trademarks
• Microsoft and Windows are trademarks or registered trademarks of Microsoft
Corporation in the United States and/or other countries.
• Adobe, Acrobat, and PostScript 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.
Revisions
• 1st Edition: January 2011
• 2nd Edition: November 2012
• 3rd Edition: August 2013
3rd Edition : August 2013 (YMI)
All Rights Reserved, Copyright © 2011 Yokogawa Meters & Instruments Corporation

iv IM AQ6375-02EN
Checking the Contents of the Package
After opening the package, check the following items before beginning use. If any of the
contents are incorrect, missing, or appear to be abnormal, please contact your Yokogawa
dealer or representative.
AQ6375 Main Unit
Check that the model and suffix code on the name plate on the rear of the instrument
match those of your order. When contacting the dealer from which you purchased the
instrument, please give them the instrument number.
MODEL Suffix Code Description
AQ6375 Optical Spectrum Analyzer AQ6375
Specification -10 Standard model
Power cord1-D UL/CSA standard power cord (part no.: A1006WD),
maximum rated voltage: 125 V
-F VDE standard power cord (part no.: A1009WD),
maximum rated voltage: 250 V
-G AS standard power cord (part no.: A1013WD),
maximum rated voltage: 250 V
-Q BS standard power cord (part no.: A1054WD),
maximum rated voltage: 250 V
-H GB standard power cord (complies with the CCC)
(part no.: A1006WD), maximum rated voltage: 250 V
-M UL/CSA standard power cord with 3P/2P converter
(part no.: A1006WD), maximum rated voltage: 125 V
Options /FC AQ9447 (FC) connector adapter (for optical input)
/SC AQ9447 (SC) connector adapter (for optical input)
/ST AQ9447 (ST) connector adapter (for optical input)
/RFC AQ9441 (FC) universal adapter (for calibration light source
output)
/RSC AQ9441 (SC) universal adapter (for calibration light source
output)
/RST AQ9441 (ST) universal adapter (for calibration light source
output)
/B5 Built-in thermal printer
1 Make sure that the attached power cord meets the designated standards of the country and
area that you are using it in.
• No. (Instrument Number)
Please contact your nearest Yokogawa representative.
Accessories
Part Name Quantity
Power cord11
User's manual (CD) 1
Getting Start Guide 1
Rubber feet 2 pieces (1 A9088ZM sheet)
Printer roll paper (with /B5 option) 1
1 Make sure that the attached power cord meets the designated standards of the country and
area that you are using it in.

v
IM AQ6375-02EN
Checking the Contents of the Package
Accessories (Sold Separately)
Part Name Model/Part Number Specifications
AQ9447 connector adapter 810804602-FCC FC type (for optical input)
810804602-SCC SC type (for optical input)
810804602-STC ST type (for optical input)
AQ9441 universal adapter 813917321-FCC FC type (for calibration light source output)
813917321-SCC SC type (for calibration light source output)
813917321-STC ST type (for calibration light source output)
Printer roll paper B9988AE Lot size is 10 rolls, 10 meters each

vi IM AQ6375-02EN
Safety Precautions
This instrument is an IEC safety class I(provided with terminal for protective earth
grounding). The general safety precautions described herein must be observed
during all phases of operation. If the instrument is used in a manner not specified in
this manual, the protection provided by the instrument may be impaired. Yokogawa
Electric Corporation assumes no liability for the customer’s failure to comply with these
requirements.
The following symbols are used on this instrument.
Danger, Refer to the user's manual.
This symbol appears on dangerous locations on the instrument which require
special instructions for proper handling or use. The same symbol appears in the
corresponding place in the manual to identify those instructions.
Alternating current
ON(power)
OFF(power)

vii
IM AQ6375-02EN
Safety Precautions
Failure to comply with the precautions below could lead to injury or death or
damage to the instrument.
WARNING
• Use the Instrument Only for Its Intended Purpose
The optical measuring instrument is designed to measure the optical
characteristics of light sources and evaluate their performance. Do not use this
instrument for anything other than as an optical measuring instrument.
• Check the Physical Appearance
Do not use the instrument if there is a problem with its physical appearance.
• Use the Correct Power Supply
Before connecting the power cord, ensure that the source voltage matches the
rated supply voltage of the instrument and that it is within the maximum rated
voltage of the provided power cord.
• Use the Correct Power Cord and Plug
To prevent the possibility of electric shock or fire, be sure to use the power cord
supplied by YOKOGAWA. The main power plug must be plugged into an outlet
with a protective earth terminal. Do not disable this protection by using an
extension cord without protective earth grounding.
Also, do not use power cord that came with the instrument on any other device.
• Connect the Protective Grounding Terminal
Make sure to connect the protective earth to prevent electric shock before
turning ON the power. The power cord that comes with the instrument is a
three-prong type power cord. Connect the power cord to a properly grounded
three-prong outlet.
• Do not Impair the Protective Grounding
Never cut off the internal or external protective earth wire or disconnect the
wiring of the protective earth terminal. Doing so poses a potential shock hazerd.
• Do not Operate with Defective Protective Grounding or Fuse
Do not operate the instrument if the protective earth or fuse might be defective.
Make sure to check them before operation.
• Reference light source output light
The instrument has a built-in reference light source for wavelength calibration,
and infrared light is always being output from the optical output connector. Never
look into the optical output connector. Infrared light entering the eyes can cause
severe injury and loss of vision.
• Do not Operate in an Explosive Atmosphere
Do not operate the instrument in the presence of flammable liquids or vapors.
Operation in such environments constitutes a safety hazard.
• Do Not Remove the Covers or Disassemble or Alter the Instrument
Only qualified YOKOGAWA personnel may remove the covers and disassemble
or alter the instrument.
Opening the cover is dangerous, because some areas inside the instrument
have high voltages.
• Installation Location
• This instrument is designed to be used indoors. Do not install or use it
outdoors.
• Install the instrument so that you can immediately remove the power cord if an
abnormal or dangerous condition occurs.

viii IM AQ6375-02EN
Safety Precautions
• Laser Class 1
This instrument complies with “Class 1 laser product” defined in “IEC60825-1.
Never look at the optical output connector or the top end of the optical fiber
connected to the optical output connector while the infrared light is being output.
If the infrared light output is observed at a distance of 100mm or less from the
infrared light emitting part by means of optical method (loupe, magnifying glass,
microscope, etc.), this may cause eye injury. The infrared light cannot be seen.
However, if the infrared light enters your eye(s), this may cause eye injury and
the eyesight to be ruined excessively.
Safety Precautions for Laser Products
This instrument uses a laser light source. This instrument is a Class 1 laser product
as defined by IEC 60825-1 Safety of Laser Products-Part 1: Equipment Classification,
Requirements and User’s Guide.
CLASS 1
LASER PRODUCT
Laser Class 1 Label
If the laser output is observed at a distance of
100mm or less from the laser beam emitting
part by means of optical method (loupe,
magnifying glass, microscope, etc.), this may
cause eye unjury.
Class Laser Type Wavelength Maximum
Output Power
Diameter of
Mode Field
Numerical
Aperture
1 EL-LED 1.55µm 0.04mW 9µm 0.1
CAUTION
Operating Environment Limitations
This product is a Class A (for industrial environments) product. Operation of this
product in a residential area may cause radio interference in which case the user
will be required to correct the interference.

ix
IM AQ6375-02EN
Waste Electrical and Electronic Equipment
Waste Electrical and Electronic Equipment (WEEE), Directive 2002/96/EC
(This directive is valid only in the EU.)
This product complies with the WEEE Directive (2002/96/EC) marking
requirement. This marking indicates that you must not discard this electrical/
electronic product in domestic household waste.
Product Category
With reference to the equipment types in the WEEE directive Annex 1, this
product is classified as a “Monitoring and Control instrumentation” product.
Do not dispose in domestic household waste. When disposing products in the EU,
contact your local Yokogawa Europe B. V. office.
New EU Battery Directive
New EU Battery Directive, DIRECTIVE 2006/66/EC
(This directive is valid only in the EU.)
Batteries are included in this product. This marking indicates they shall be sorted
out and collected as ordained in ANNEX II in DIRECTIVE 2006/66/EC.
Battery type
Lithium battery
You cannot replace batteries by yourself. When you need to replace batteries,
contact your local Yokogawa Europe B.V.office.

xIM AQ6375-02EN
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.
Note Calls attention to information that is important for proper operation of
the instrument.
Notations Used on Pages Describing Operating Procedures
On pages that describe the operating procedures, 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.
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)

xi
IM AQ6375-02EN
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
of IM AQ6375-01EN.
Preparing for Measurement
Setting Conditions and Measuring
Waveform Display
Installing the Instrument
Turning the Power ON/OFF
Wavelength Calibration
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
Internal Printer(Optional)
Section 3.1
Section 3.4
Section 3.7
Section 5.1
Section 5.2 to 5.11
Section 6.1 to 6.4
Section 6.5
Section 6.8
Section 6.12
Section 7.1 to 7.9
Section 7.12
Section 8.1
Section 8.2 to 8.8
Section 4.6
Measurement Start (Sweep)
External Trigger Measurement
Synchronous Sweep Measurement
Section 5.12
Section 5.15
Section 5.17

xiii
IM AQ6375-02EN
Contents
Checking the Contents of the Package .......................................................................................... iv
Safety Precautions.......................................................................................................................... vi
Waste Electrical and Electronic Equipment ....................................................................................ix
New EU Battery Directive ............................................................................................................... ix
Symbols and Notation Used in This Manual....................................................................................x
Flow of Operation ........................................................................................................................... xi
1 Front Panel ............................................................................................................................15
2 Rear Panel.............................................................................................................................16
3 Panel Keys and Knobs ..........................................................................................................17
4 LCD Screen ...........................................................................................................................20
5 Installing the Instrument.........................................................................................................22
6 Attaching the Connector Adapter...........................................................................................24
7 Connecting a Communication Interface.................................................................................26
8 Turning the Power ON/OFF...................................................................................................29
9 Connecting the DUT ..............................................................................................................34
10 Specications.........................................................................................................................35
11External Dimensions..............................................................................................................38

15
IM AQ6375-02EN
1 Front Panel
Front Panel
AQ6375
USB
POWER
FUNCTION DATA E NTRY
CENTER
SWEEP
SPAN LEVEL
ZOOM
SETUP
MARKER
DISPLAY
PEAK
SEARCH
TRACE
ANALYSIS
USER MEMORY FILE
SYSTEM
ADVANCE
PROGRAM
OREMOTE
UNDO/
LOCAL
HELP
COPY
FEED
COARSE
789
456
123
0.
-
BACK
SPASE
nm/
ENTER
m/
ENTER
OPTICAL INPUT CALIBRATION
OUTPUT
1 2
3 4
5 6 7 8 9 10
11 12
1200 ~ 2400 nm
OPTICAL SPECTRUM ANALYZER
No. Name Function
1 LCD display Displays measured waveform, measurement conditions,
measurement values, etc.
2 Soft key section Used to execute the functions assigned to the soft keys on
the right side of the LCD display
3 FUNCTION section Used to enter settings pertaining to all measurements
(sweep, measurement conditions, data analysis, and various
functions)
4 DATA ENTRY section Used for measurement condition parameter input, label
input, etc.
5 POWER Used to start and shut down the instrument.
6 USB interface Used to connect USB storage media
7 UNDO/LOCAL See the following table(3 Panel keys and Knobs)
8 HELP Used to check the contents of the soft key menu displayed
on the screen.
9 COPY Used to make hard copies of the screen through the internal
printer (optional)
10 FEED Used to feed recording paper
11 OPTICAL INPUT Optical input connector
12 CALIBRATION OUTPUT Reference light source optical output connector used for
alignment adjustments and wavelength calibration

16 IM AQ6375-02EN
2 Rear Panel
Rear Panel
TRIGGER
IN
TRIGGER
OUT
ANALOG
OUT
SERIAL
(RS
- 232)
ETHERNET
10/100BASE
- TX
VIDEO OUT
(SVGA)
KBD
GP
- IB1
(IEEE488.1/488.2)
GP
- IB2
(IEEE488.1)
(FOR TLS,ETC. )
WARNING
MAIN POWER
ON
OFF
100 - 240V AC
150VA MAX
50/60Hz
FUSE
250V T5A
910
8
11
3 4 5
1
2
6
7
USB
USB
12
13
No. Name Function
1 GP-IB1 GP-IB port for controlling this unit through an external
computer
2 GP-IB2 GP-IB port that allows this unit to serve as a system
controller on the GP-IB bus for controlling an external device
3 SERIAL RS-232 interface
4 TRIGGER IN Input connector for synchronous signals for the synchronous
measurement function with the Tunable Laser Source
5 TRIGGER OUT Output connector for synchronous signals for the
synchronous measurement function with the Tunable Laser
Source
6 ANALOG OUT Analog output
7 MAIN POWER Used to turn the main power ON/OFF
8 Power cord connector Connect the power cord to this connector
9 VIDEO OUT (SVGA) Analog RGB video signal (SVGA-compliant) interface
10 ETHERNET Ethernet Interface (10/100BASE-TX)
11 USB interface Used to connect USB storage media or USB mouse
12 KBD External keyboard interface (PS/2)
13 Exhaust holes

17
IM AQ6375-02EN
3 Panel Keys and Knobs
FUNCTION Section
The FUNCTION section contains 17 function keys and 4 auxiliary keys. When you press
a function key, information about the function is displayed on the soft key menu located
on the right side of the LCD display.
SWEEP
The SWEEP key contains functions related to sweeping. When you press the SWEEP
key, the soft key menu for sweeping appears.
CENTER
The CENTER key contains functions related to setting the center wavelength and center
frequency for measurements. The soft key functions change depending on whether the
screen display mode is wavelength display mode or frequency display mode.
SPAN
The SPAN key contains functions pertaining to settings for the wavelength span or
frequency span being measured. The soft key functions change according to whether the
screen display mode is wavelength display mode or frequency display mode.
LEVEL
The LEVEL key contains functions related to level axis settings.When you press the
LEVEL key, the soft key menu for setting reference level appears.
SETUP
The SETUP key contains functions related to measurement condition settings.
ZOOM
The ZOOM key contains the zoom function, which allows the user to freely enlarge or
reduce a measured waveform in order to check a small area of the measured waveform,
or to check the overall waveform.
This key is used to set the waveform enlarged/reduced display conditions.
DISPLAY
The DISPLAY key contains functions related to screen display.This key is used to set the
screen to upper/lower 2-split display mode (split mode).
TRACE
The TRACE key contains functions related to trace mode settings.
MARKER
The MARKER key contains functions related to markers.
PEAK SEARCH
The PEAK SEARCH key contains functions for searching for peaks and bottoms in
measured waveforms.
ANALYSIS
The ANALYSIS key contains functions related to measured waveform analysis.
FUNCTION
CENTER
SWEEP
SPAN LEVEL
ZOOM
SETUP
MARKER
DISPLAY
PEAK
SEARCH
TRACE
ANALYSIS
USER MEMORY FILE
SYSTEM
ADVANCE
PROGRAM
OREMOTE
UNDO/
LOCAL
HELP
COPY
FEED

18 IM AQ6375-02EN
MEMORY
The MEMORY key contains functions for writing the contents of the active trace to the
unit’s internal memory. When you press the MEMORY key, the traces and memory list
screen (soft key menu) are displayed. A memory number may be entered in the DATA
ENTRY section, or selected using the rotary knob or arrow keys.
FILE
The FILE key contains functions for saving and loading waveform data, program data,
and the like to and from USB storage media (USB memory/HDD).
PROGRAM
The PROGRAM key contains the soft keys related to program functions for controlling
measurements through a program.
SYSTEM
The SYSTEM key contains system-related functions such as monochromator adjusting
optical alignment, wavelength adjustment, hardware setup, and setting initialization.
ADVANCE
The ADVANCE key contains functions related to template function settings.
USER
Frequently used soft keys can be registered on the soft key menu in the USER key.
Registering frequently used soft keys in the USER key allows you to execute frequently
used functions in a small number of steps.
COPY/FEED
The COPY key is used to output the measurement screen to the internal printer or a file.
When you press the COPY key, the measured waveforms and lists displayed on the
screen are output to the internal printer or a file.
The FEED key is used to feed printer paper. Paper feeding continues as long as you hold
down the FEED key.
UNDO/LOCAL
The key's function changes depending on the status of the instrument when the UNDO/
LOCAL key is pressed. The following table shows the key's functions.
Status of Instrument Function
UNDO action is allowed If the UNDO key is pressed after changing parameter
settings, changing or deleting data, etc., the previous
action (change, deletion, etc.) is canceled and the state
preceding that action is restored.
During user key registration If the UNDO key is pressed during user key registration,
registration mode is canceled and the soft key menu
which appeared when the SYSTEM key was pressed is
displayed again.
During remote control by
external PC (Remote light is on)
Changes the state from the remote state back to the
local state. The remote light turns off.
HELP
When you press the HELP key, a soft key menu of the currently displayed screen is
displayed explanations.
Soft keys for selecting the “MORE INFO” which indicate additional information are
displayed by some soft keys in HELP screen.
3 Panel Keys and Knobs

19
IM AQ6375-02EN
DATA ENTRY Section
This unit allows you to enter measurement conditions and various other parameters
through the DATA ENTRY section. Three different entry methods can be used in the
DATA ENTRY section, the rotary knob, the arrow keys, and the numeric keypad.
Rotary knob
When you press a soft key which has a parameter, the current setting is displayed in
the parameter entry window. Turning the rotary knob raises or lowers the numeric value
shown in the parameter entry window (turn clockwise to increase and counterclockwise
to decrease), and the internal setting changes at the same time.
Note that if the COARSE key is on (lamp on), the numeric value increase/decrease step
will be larger.
Arrow keys (▲, ▼)
Pressingthe▲keyhasthesameeffectasturningtherotaryknobclockwise.Likewise,
pressingthe▼keyhasthesameeffectasturningtherotaryknobcounterclockwise.
Holding an arrow key down for 0.5 second or longer activates auto-repeat.
If the multi-marker function has been selected, the arrow keys can be used to scroll the
marker value display in the data area.
COARSE Key
You can raise the digit of settings being entered or the increase/decrease step for
numerical values.
Each time you press this key the setting toggles between ON and OFF. When ON, the
lamp lights.
Numeric keypad
You can enter numerical values directly into the parameter input window by pressing
keys of the numeric keypad.
After you have pressed a parameter soft key to display the current setting in the
parameter display area, you can press a numeric keypad key to display the numeric
keypad input area including the entered numeric value.
If the value entered with the numeric keypad is not in the allowed value range, the
nearest allowed value will be set.
μm/ENTER Key and nm/ENTER Key
Enters values input using the numeric keypad or the parameter input window.
Use one or the other key if entering a parameter value with a particular unit.
Ifaparameterdoesnothaveaunitassociatedwithit,youcanuseeithertheμm/ENTER
key or the nm/ENTER key.
BACK SPACE Key
Use this key if you make an error when inputting values with the numeric keypad. The
last entered (right-most) character is removed, allowing entry of the correct character.
By holding the BACK SPACE key down, you can erase the entire entry in the numeric
keypad input area and make the numeric keypad input area disappear, returning it to the
condition preceding numeric keypad input.
DATA ENTRY
COARSE
789
456
123
0.
-
BACK
SPASE
nm/
ENTER
m/
ENTER
3 Panel Keys and Knobs

20 IM AQ6375-02EN
4 LCD Screen
1
2
3
4
5
6
7 8 9 10 11 12 13
14 15 16 17
18
19
20
21
22
No. Function
1 Data area
2 Measurement conditions area
3 (Displayed when any of the measurement conditions are changed.)
4 Displays level axis scale per DIV
5 (Displayed when measurement is not correctly carried out.)
6 Displays reference level
7 Label area (56 characters)
8 Displays wavelength resolution
9 Displays measurement sensitivity
10 Displays averaging times
11 Displays the number of measurement samples
12 Displays date and time
13 Displays each trace status
14 (Only displayed when ZOOM function is used)
15 Displays the statuses of main settings (When a setting is ON, its display is depressed, or
is displayed with white on black background if the display colors are black and white.)
16 Displays wavelength axis scale per DIV
17 Displays sweep status
(RPT=Repeat; SGL=Single; STP=Stop)
18 Displays soft key menu
(Displays markers and data analysis results.)