THORLABS PDFA100 User manual

PDFA100
O-Band Praseodymium
Doped Fiber Amplifier
Operating Manual

Fiber Amplifier
Table of Contents
Warning Symbol Definitions..............................................................................................1
Safety....................................................................................................................................2
Description...........................................................................................................................4
3.1.Shipping List....................................................................................................................4
Setup.....................................................................................................................................5
4.1.Setting the AC Line Voltage ...........................................................................................5
4.2.Changing the Fuse ..........................................................................................................5
4.3.Initial Setup ......................................................................................................................5
Operation from Instrument Front Panel...........................................................................6
5.1.Front and Back Panel Overview.....................................................................................6
5.2.Turning On the Amplifier ................................................................................................7
5.3.Adjusting the Fiber Amplifier Gain ................................................................................7
5.4.Turning the Fiber Amplifier Off ......................................................................................7
Remote Operation from Command-Line Interface.........................................................8
Making Safety Interlock Connections..............................................................................9
Troubleshooting.................................................................................................................10
General Maintenance.........................................................................................................11
9.1.Cleaning .........................................................................................................................11
9.2.Connector Cleaning ......................................................................................................11
Specifications.....................................................................................................................12
Mechanical Drawings.........................................................................................................14
Regulatory...........................................................................................................................15
12.1.Waste Treatment is Your Own Responsibility............................................................15
12.2.Ecological Background ................................................................................................15
Declaration of Conformity.................................................................................................16
Thorlabs Worldwide Contacts..........................................................................................17

Fiber Amplifier Chapter 1: Warning Symbol Definitions
Rev C, March 9, 2020 Page 1
Warning Symbol Definitions
Note: Throughout this manual, references to temperature are with respect to °C.
Below is a list of warning symbols you may encounter in this manual or on your device.
Symbol Description
Direct Current
Alternating Current
Both Direct and Alternating Current
Earth Ground Terminal
Protective Conductor Terminal
Frame or Chassis Terminal
Equipotentiality
On (Supply)
Off (Supply)
In Position of a Bi-Stable Push Control
Out Position of a Bi-Stable Push Control
Caution: Risk of Electric Shock
Caution: Hot Surface
Caution: Risk of Danger
Warning: Visible or Invisible Laser Radiation
Caution: Spinning Blades May Cause Harm

Fiber Amplifier Chapter 2: Safety
Page 2 TTN190684-D02
Safety
All statements regarding safety of operation and technical data in this instruction manual will only apply when the
unit is operated correctly.
SHOCK WARNING
High voltage inside. To avoid electrical shock, before powering the unit on, make sure that the
protective conductor of the 3-conductor power cord is correctly connected to the protective earth
contact of the socket outlet. Improper grounding can cause electric shock resulting in severe injury
or even death. Do not operate without cover installed.
EXPLOSION WARNING
This instrument must not be operated in an explosion endangered environment.
LASER WARNING
Avoid Exposure – Radiation Emitted from apertures. Do not look into the laser aperture while the
laser is on. Injury to the eye may result. Laser should not be turned on unless there is an optical
fiber connected to the laser output port. Caution – Use of controls or adjustments or performance of
procedures other than those specified herein may result in hazardous radiation exposure.
CAUTION
Note: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the
following measures: Reorient or relocate the receiving antenna.—Increase the separation between
the equipment and receiver.—Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.—Consult the dealer or an experienced radio/TV technician for help.
CAUTION
This instrument should be kept clear of environments where liquid spills or condensing moisture
are likely. It is not water resistant. To avoid damage to the instrument, do not expose it to spray,
liquids, or solvents.

Fiber Amplifier Chapter 2: Safety
Rev C, March 9, 2020 Page 3
The unit is supplied with a region-specific power cord. If using your own power cord, make sure it is IEC 320
compatible.
Make sure that the line voltage rating marked on the rear panel agrees with your local supply and that the
appropriate fuses are installed. Changing of the mains fuse can be done by the user (see Section 4.2, Changing
the Fuse). With the exception of the mains fuses, there are no user serviceable parts in this product.
Do not operate in wet or damp conditions. Do not obstruct the air ventilation slots in the housing!
This device can only be returned when packed into the complete original packaging, including all foam packing
inserts. If necessary, ask for a replacement package.
Mobile telephones, cellular phones, or other radio transmitters should not to be used within the range of three
meters of this unit since the electromagnetic field intensity may exceed the maximum allowed disturbance values
according to EN50082-1.

Fiber Amplifier Chapter 3: Description
Page 4 TTN190684-D02
Description
Thorlabs' Praseodymium-Doped Fiber Amplifier (PDFA) offers high gain, high saturation power, and a low noise
figure, making it ideal for use within optical networks as either a booster amplifier or preamplifier. The fiber amplifier
technology offers an alternative to semiconductor amplifiers (SOAs) with improved optical performance by
eliminating the signal distortions typically associated with gain saturation in SOA devices. Each fiber amplifier is
enclosed in a compact, turnkey benchtop package with FC/APC (2.0 mm narrow key) input and output connectors.
The system integrates a pump laser and precision current driver to adjust the pump power in the amplifier. The
current adjustment, done through an adjustment knob on the front panel, varies the amplifier gain. The amplifier
includes input and output isolators to protect the input laser source from any amplified spontaneous emission or
back reflections, as well as to prevent the pump light from exiting the amplifier.
The PDFA gain can be controlled in constant current control (ACC) mode via the front panel interface. The pump
current of the amplifier is adjustable through the instrument's front panel, allowing the user to vary the gain and
output power. The display screen shows the pump level, as well as the temperature and emission status. An
indicator light is also included on the enable button to show when the internal laser is active. In addition to this mode
of operation, the PDFA can be operated in constant power control (APC) and constant gain control (AGC) modes
using a command-line interface via USB connection with a PC. These modes of operation allow the user to control
the amplifier for a fixed output power level or a fixed gain value. The amplifier automatically adjusts the pump current
in order to maintain the power or gain target values. For further information regarding all three modes of operation,
please see Chapter 5.
For added safety, there is an interlock connector located on the rear panel that must be shorted in order for the
output to be enabled. This can easily be configured to be triggered by doors to disable the fiber amplifier in unsafe
conditions. An enable button must be set to activate the amplifier, and a green LED indicator displays the current
state of the unit. There is a 3 second delay before the fiber amplifier turns on, and the user is warned by the rapidly
blinking LED.
The amplifier includes a universal power supply allowing operation over 100 to 240 VAC without the need for
selecting the line voltage. The fuse access is conveniently located on the rear panel.
3.1. Shipping List
The PDFA100 consists of the following components:
O-Band Praseodymium-Doped Fiber Amplifier in Benchtop Package
Interlock-Shorting BNC Connector
Region-Specific Power Cord
USB Cable
FBC250 Connector and Bulkhead Cleaner

Fiber Amplifier Chapter 4: Setup
Rev C, March 9, 2020 Page 5
Setup
CAUTION
Prior to using the PDFA systems, it is highly recommended to clean the input and output bulkheads
as well as the connector facets to be connected to the bulkheads. Failure to clean the connectors
can result in damage to the internal connectors in the PDFA as well as the connectors on fiber
patch cables connected to the PDFA.
When cleaning the connectors, ensure that the PDFA is powered off by turning off the push-button
switch. Never inspect optical connectors unless all light sources in your setup have been switched
off. Please refer to Section 9.2 for further instructions regarding connector cleaning.
4.1. Setting the AC Line Voltage
The fiber amplifier has been shipped configured for 100 to 240 VAC operation. There is no end user adjustment of
the line voltage for 110 or 220 VAC. The user needs to select the correct AC cord for their location.
4.2. Changing the Fuse
To change the power fuse, follow the following steps.
1. Remove the AC power cord if it is connected to the unit.
2. Locate the fuse tray directly adjacent to the AC power cord connection on the rear panel of the unit.
3. Carefully use a flat blade screwdriver to open the fuse tray.
4. Remove the existing fuses and install two fuses with the appropriate specifications. The replacement fuses
must be 5 mm x 20 mm, 2 A, 250 VAC, slow-blow type.
5. Push the fuse tray back into place making sure that it snaps and sits correctly.
6. Connect the appropriate power cord into the AC receptacle and plug the unit in.
4.3. Initial Setup
1. Set the unit on a dry, level working surface.
2. Plug the female end of the provided AC line cord into the IEC input receptacle on the rear of the unit. Plug
the male end into a properly grounded AC socket.
3. Install the interlock BNC connector. (See page 8 for details on the interlock circuitry.)
4. Connect the input to be amplified to the input fiber receptacle using a FC/APC fiber patch cable, carefully
cleaning both the input FC bulkhead connector and the patch cable connector beforehand. Please note that
a standard single mode (SM) cable should be used for the PDFA100, and that the input power entering the
amplifier should not exceed 10 dBm (10 mW).
5. Carefully clean both the output FC bulkhead connector and the connectors on both ends of a second
FC/APC patch cable. Connect one end of the cable to the output receptacle on the unit. Connect the other
end to a power meter or another measurement instrument. The output power from the amplifier – when
observing the 10 dBm (10 mW) input power limit – is guaranteed not to exceed 150 mW. Care should be
taken to avoid damage to the measurement instrument connected to the output port. Also note that when
the amplifier is enabled, it generates amplified spontaneous emission even when there is no input light
entering the amplifier. This should be considered when connecting measurement instruments to the output
port of the amplifier and when inspecting the fiber connectors.

Fiber Amplifier Chapter 5: Operation from Instrument Front Panel
Page 6 TTN190684-D02
Operation from Instrument Front Panel
5.1. Front and Back Panel Overview
Figure 1 Front and Rear Panels of the Fiber Amplifier (PDFA100)
Amplifier Input Port
FC/APC Bulkhead
Pump Current Adjustment Knob
Push to adjust.
Push-Button Power Switch
Display
Indicates pump current level (0-100%),
temperature status, and emission status.
Remote Interlock Input (BNC)
See page 9 for connection logic.
USB Port
Communication Port fo
r
Diagnostics and Remote
Interface
Fuse Tray
See Section 4.2 for
replacement details.
Amplifier Output Por
t
FC/APC Bulkhead
AC Power Cord
Connector
Cooling Fan - Do Not Block
Moves air from vent holes on the bottom and sides.
Periodically remove dust buildup from vents for
best operation.
AC Power On/Off
Switch
Enable Switch
and Emission
Indicator

Fiber Amplifier Chapter 5: Operation from Instrument Front Panel
Rev C, March 9, 2020 Page 7
5.2. Turning On the Amplifier
1. Please consult with your organization’s laser safety officer regarding proper operation of the amplifier at
your institution.
LASER WARNING
The amplifier generates invisible amplified spontaneous emission (ASE) even without any optical
input. The power level of the ASE can be as high as 30 mW. Therefore, all laser safety measures
should be followed even if the input light to the amplifier has been disconnected or switched off.
Additionally, it should be noted that connecting a laser to the output port of the amplifier by mistake
can cause damage to the laser due to the ASE light getting coupled into the laser source.
2. Turn on the AC power switch on the back panel.
3. Press the POWER push-button switch. The display will turn on. The pump current set-point (in % of max)
will be displayed in the middle of the screen.
4. Check the temperature status on the bottom left corner of the display. It should show “OK”. If the
temperature status shows “Stabilization” for more than 30 seconds or if it shows “Error”, please turn the
unit off and contact technical support.
5. Check the emission status of the device on the bottom right corner of the screen. It should show “Off” prior
to enabling the amplifier.
6. Make sure the interlock input on the back panel is short-circuited. See Section 6 for detailed instructions.
7. Press and release the ENABLE switch to activate the fiber amplifier. There will be a 3 second delay before
the fiber amplifier powers up. During this time, the ENABLE indicator will light up and blink.
8. Adjust the pump current set-point to the desired value by pressing the adjustment knob once. The “%” sign
blinks in the adjustment mode and it times out after 5 seconds. The knob must be pressed again after the
time-out in order to make additional adjustments to the pump current set-point.
9. Ensure that the temperature status still shows “OK” after the pump current has been increased to the
desired level. The amplifier is now producing gain and is ready to use.
5.3. Adjusting the Fiber Amplifier Gain
The default operation mode of the amplifier is by controlling the pump current. This operation mode is refered to as
the automatic current control (ACC). The fiber amplifier gain and output power are controlled by varying the pump
current set-point. The system specifications represent the performance at max operating set-point (100%). Each
unit is shipped with a test data sheet that shows the amplifier output power at two different input power levels (0
dBm and -30 dBm) as a function of the pump current set-point. The data can be used as a reference to adjust the
pump current set-point for a desired gain level. In addition to the ACC mode of operation, it is possible to operate
the PDFA in automatic power control (APC) and automatic gain control (AGC) modes. These modes of operation
are only accessible through the command-line interface as explained in Chapter 6 of this manual.
5.4. Turning the Fiber Amplifier Off
Disabling the amplifier emission - The amplifier output can be turned off by pressing and releasing the
ENABLE switch. The pump diode temperature will be maintained even when the amplifier is disabled. The
temperature status should show “OK” after the amplifier has been disabled.
Power Down - When completely powering down an enabled unit, first press and release the ENABLE
switch and then press the POWER push-button switch, which will turn OFF the entire unit. Anytime the unit
is turned OFF and then turned back ON, the fiber amplifier will be disabled until the ENABLE switch is
pressed. If the amplifier is not being used for an extended period of time, it is recommended to turn off the
AC power using the switch located on the back panel of the instrument. Please note that the pump current
set-point goes back to 0% after each AC power cycle.

Fiber Amplifier Chapter 6: Remote Operation from Command-Line Interface
Page 8 TTN190684-D02
Remote Operation from Command-Line Interface
The Command Line Interface (CLI) provides the user with a method of controlling the PDFA remotely over the
USB interface that is emulating a serial port. A standard terminal program (such as Tera Term) can be used to
send commands to the PDFA and receive responses. The following functions are available through the CLI:
Enabling and disabling the amplifier emission.
Reading status indicators
Setting the current set-point value in the ACC operation mode.
Operating the system in APC or AGC modes at user-defined power or gain values.
The list below shows the list of available commands along with a brief description and syntax:
Command: Command description:
Help DISPLAY COMMANDS – Lists commands available to the user
le ENABLE LASER – Turns the Pump LASER ON
ld DISABLE LASER - Turns the Pump LASER OFF
sloc SET LASER DIODE OPERATING CURRENT – Sets the Pump LASER output
sloc <current>
Set current is between: 0 to 100 percent
gloc GET LASER DIODE OPERATING CURRENT – Returns the Pump LASER
output
stat STATUS REGISTER – Returns the following status info:
Interlock : Open or Closed
Temp stable: Stable or Unstable
Temp fault : No Fault or Fault
LASER : ON or OFF
runpwr RUN PID POWER CONTROL – Enables the amplifier and starts the PID power
control loop to keep output power constant
runpwr <power>
<power> can be any positive value representing the output power in
micro-Watts
rungain RUN PID GAIN CONTROL – Enables the amplifier and starts the PID gain
control loop to keep the amplifier gain constant
rungain <gain>
<gain> can be any positive value representing the gain value in linear
scale.
Please note that the system default mode is the ACC mode. This mode is accessible by the front panel operation
and the current set point is adjustable using the front panel knob as well as the CLI. The instrument enters this
mode after every power cycle. Enabling the laser from the front panel switch or by executing the “le” command
results in entering the ACC mode of operation. The APC and AGC modes of operation can be activated using the
commands “runpwr” and “rungain”. These commands enable the amplifier and start control loops to maintain a
constant level of output power or gain. The control loops can be interrupted by turning the laser off using the
command “ld”. Alternatively, by setting the power or gain to zero, the control loop is interrupted and amplifier
emission is turned off. If the control loop fails to reach its target under either APC or AGC modes, the closed-loop
operation is automatically terminated and the amplifier id disabled. Upon exiting the control loop, the amplifier goes
back to the default ACC mode.

Fiber Amplifier Chapter 7: Making Safety Interlock Connections
Rev C, March 9, 2020 Page 9
Making Safety Interlock Connections
The PDFA100 is equipped with a remote interlock connector located on the rear panel. In order to enable the fiber
amplifier, a short circuit must be applied across the terminals of the Remote Interlock connector. This connection is
made available to allow the user to connect a remotely actuated switch to the connector (i.e. an open door indicator).
The switch that is connected to this interlock must be normally open (N.O.), meaning that it has to be closed in
order for the unit to be enabled. If the switch is changed to an open state, the amplifier will automatically shut down.
If the switch returns to a closed condition, the amplifier will not re-enable until the ENABLE switch is pressed.
All units shipped from Thorlabs are configured with a shorting BNC device installed in the interlock connector. If you
are not going to use this feature then you can leave the shorting device installed and the unit will operate normally,
as described throughout this manual. If you wish to make use of the interlock feature you will need to acquire the
appropriate mating connector (BNC male) and wire it to your remote interlock switch.

Fiber Amplifier Chapter 8: Troubleshooting
Page 10 TTN190684-D02
Troubleshooting
CAUTION
Invisible Laser Radiation. Do not look directly into the fiber receptacle. Use a viewing card to help
determine whether the fiber amplifier is generating an output.
WARNING
Never open the amplifier housing cover for troubleshooting. Refer servicing to qualified personnel.
The following table describes some typical problems that may be encountered while using the PDFA100 and
possible solutions to these problems.
Problem Solution
Unit does not turn on when pressing the
power ON/OFF button on the front panel.
1. Make sure the AC line cord is fully inserted into the
AC Input receptacle and plugged into an outlet
providing 100 to 240 VAC. Also ensure that the AC
power switch on the back panel has been turned on.
2. Fuse(s) may be open. Refer to Section 4.2 for
information on replacing open fuses. If the problem
persists, please return the unit to Thorlabs for
evaluation.
Unit powers on but does not enable when
pressing the ENABLE button.
1. Check to make sure the interlock connector is
installed on the rear panel. See Chapter 7 for details.
2. Check the temperature status on the front panel
display. If temperature status is not OK for more than
30 seconds, turn the unit off and contact technical
support.
Unit is enabled but there is no output.
1. Check to make sure you are using the correct type
of fiber patch cable for the particular wavelength and
FC/APC connector type.
2. Check to make sure the input connector to the
PDFA has power.
3. Inspect the connectors on both cables connected to
input and output ports to ensure they are clean and not
dama
g
ed.

Fiber Amplifier Chapter 9: General Maintenance
Rev C, March 9, 2020 Page 11
General Maintenance
Aside from the AC input fuse, there are no user serviceable parts in this product. If you suspect something has
failed in the unit, please contact Thorlabs for advice on returning the unit for evaluation.
Always clean fiber optic connectors that will be inserted into the system and install the dust cap whenever the source
is not being used. Allowing dust and dirt onto the fiber end faces will degrade coupling efficiency and possibly
damage the fiber patch cables, both inside and outside.
9.1. Cleaning
The housing can be cleaned using a soft, slightly damp cloth. Avoid using any solvents on or near the unit. Keep
the vent holes on the sides, rear and bottom of the enclosure free of dust buildup. Restricted airflow will cause the
temperature controls to operate inefficiently and, in extreme cases, loss of temperature control.
9.2. Connector Cleaning
Always clean the ferrule end of your fiber patch cables as well as the input and output FC bulkheads prior to inserting
the fiber patch cables into the FC bulkheads. Thorlabs offers the FCC-7020 Fiber Cleaning Cloth Spool, which can
be used for cleaning the ferrule ends of the patch cables.
Additionally, each unit is shipped with an FBC250 Bulkhead and Connector Cleaner for cleaning the input and
output bulkheads.
Figure 2 FBC250 Bulkhead and Connector Cleaner
To use the FBC250 Bulkhead and Connector Cleaner, please refer to the instructions shipped with the FBC250.

Fiber Amplifier Chapter 10: Specifications
Page 12 TTN190684-D02
Specifications
Item # PDFA100
Amplifier Specifications (Taken at 100% Pump Current Set-Point)
a
Operating Wavelength Range
b
1280 nm - 1330 nm
Input Power Range -30 - 10 dBm
Output Power (@ 3 dBm Input Power)
c,d
>16 dBm
Small Signal Gain (@ -30 dBm Input Power)
c
>20 dB
Noise Figure (@ -30 dBm Input Power)
c
<8 dB
Laser Class 1M
Fiber Specifications
Polarization-Dependent Gain <0.5 dB
Return Loss at Input Port >50 dB
Input / Output Isolation >30 dB
Input / Output Fiber Type Single Mode
Input / Output Fiber Connectors FC/APC Compatible, 2.0 mm Narrow Key
a. SMF-28 Ultra fiber patch cables with FC/APC connectors are used on the input and output.
b. The wavelength range over which the small signal gain (at -30 dBm input power) does not fall below
10 dB.
c. Specified at 1310 nm. Please refer to published data on the Thorlabs website for typical curves showing
the variation of each parameter with wavelength.
d. Please refer to published data on the Thorlabs website for the scaling of the output power vs. the input
power.
Absolute Maximum Ratings
Absolute Maximum Input Power 10 mW (10 dBm)
Absolute Maximum Output Power 150 mW (22 dBm)
Operating Temperature 15 to 30 °C
Storage Temperature -10 to 40 °C

Fiber Amplifier Chapter 10: Specifications
Rev C, March 9, 2020 Page 13
General Specifications
Input Voltage 100 - 240 VAC, 50 - 60 Hz
Input Power 20 W (Max)
Fuse Rating 2 A, 250 V
Fuse Type Time-Lag (Slow-Blow)
Fuse Size 5 mm x 20 mm
Dimensions (W x D x H) 250.0 mm x 300.0 mm x 122.2 mm
(9.84" x 11.81" x 4.81"
)
Weight 7.5 lbs

Fiber Amplifier Chapter 11: Mechanical Drawings
Page 14 TTN190684-D02
Mechanical Drawings
Figure 3 PDFA100 Mechanical Drawing

Fiber Amplifier Chapter 12: Regulatory
Rev C, March 9, 2020 Page 15
Regulatory
As required by the WEEE (Waste Electrical and Electronic Equipment Directive) of the European Community and
the corresponding national laws, Thorlabs offers all end users in the EC the possibility to return “end of life” units
without incurring disposal charges.
This offer is valid for Thorlabs electrical and electronic equipment:
Sold after August 13, 2005
Marked correspondingly with the crossed out “wheelie bin” logo (see right)
Sold to a company or institute within the EC
Currently owned by a company or institute within the EC
Still complete, not disassembled and not contaminated
As the WEEE directive applies to self-contained operational electrical and electronic products, this end of life take
back service does not refer to other Thorlabs products, such as:
Pure OEM products, that means assemblies to be built into a unit by the user (e. g. OEM laser driver cards)
Components
Mechanics and optics
Left over parts of units disassembled by the user (PCB’s, housings etc.).
If you wish to return a Thorlabs unit for waste recovery, please contact Thorlabs or your nearest dealer for further
information.
12.1. Waste Treatment is Your Own Responsibility
If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery.
Do not dispose of the unit in a litter bin or at a public waste disposal site.
12.2. Ecological Background
It is well known that WEEE pollutes the environment by releasing toxic products during decomposition. The aim of
the European RoHS directive is to reduce the content of toxic substances in electronic products in the future.
The intent of the WEEE directive is to enforce the recycling of WEEE. A controlled recycling of end of life products
will thereby avoid negative impacts on the environment.
Wheelie Bin Logo

Fiber Amplifier Chapter 13: Declaration of Conformity
Page 16 TTN190684-D02
Declaration of Conformity

Fiber Amplifier Chapter 14: Thorlabs Worldwide Contacts
Rev C, March 9, 2020 Page 17
Thorlabs Worldwide Contacts
For technical support or sales inquiries, please visit us at www.thorlabs.com/contact for our most up-to-date
contact information.
USA, Canada, and South America
Thorlabs, Inc.
UK and Ireland
Thorlabs Ltd.
sales.uk@thorlabs.com
techsupport.uk@thorlabs.com
Europe
Thorlabs GmbH
europe@thorlabs.com
Scandinavia
Thorlabs Sweden AB
France
Thorlabs SAS
Brazil
Thorlabs Vendas de Fotônicos Ltda.
Japan
Thorlabs Japan, Inc.
China
Thorlabs China
chinasales@thorlabs.com

www.thorlabs.com
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