THORLABS PDB48*C-AC series, PDB480C-AC, PDB481C-AC Operation Manual

Balanced Amplified Photodetectors

PDB48xC-AC
Operation Manual

2019

Version:
Date:

1.6
14-Jan-2019

Item No.:

M-0009-510-666

Copyright © 2019 Thorlabs

Contents

Foreword

2

1 General Information 3

2 Installation 4

3 Operating Instruction 5

4 Maintenance and Service 10
5 Appendix 11

31.1 Safety

31.2 Ordering Codes and Accessories

42.1 Parts List

42.2 Getting Started

53.1 Operating Principle

63.2 Optical Inputs

63.3 Electrical Outputs

73.4 Mounting

83.5 CMRR and Frequency Response

93.6 Recommendations

125.1 Technical Data

135.1.1 Individual Diagrams PDB480C-AC

155.1.2 Individual Diagrams PDB481C-AC

175.2 Dimensions

185.3 Certifications and Compliances

195.4 Warranty

195.5 Copyright and Exclusion of Reliability

205.6 Thorlabs Worldwide Contacts and WEEE Policy

We aim to develop and produce the best solution for your application
in the field of optical measurement technique. To help us to live up to
your expectations and constantly improve our products we need
your ideas and suggestions. Therefore, please let us know about
possible criticism or ideas. We and our international partners are
looking forward to hearing from you.

Thorlabs GmbH

Warning

Sections marked by this symbol explain dangers that might result in
personal injury or death. Always read the associated information
carefully, before performing the indicated procedure.

Attention

Paragraphs preceded by this symbol explain hazards that could
damage the instrument and the connected equipment or may cause
loss of data.

Note

This manual also contains "NOTES" and "HINTS" written in this form.

Please read this advice carefully!

2

© 2019 Thorlabs

1 General Information

1 General Information

Thorlabs PDB48xC-AC Balanced Amplified Photodetectors consist of two well-matched, fiber
coupled photodiodes with length matched fibers and an ultra-low noise, ultra-low distortion
high-speed transimpedance amplifier that generates an output voltage (RF OUTPUT) propor­tional to the difference between the photo current in the two photodiodes, i.e. the two optical in­put signals. Additionally, the unit has two fast monitor outputs (MONITOR+ and MONITOR-) to
measure the individual optical input power level as well as low frequency (up to 3 MHz) modu­lated signals on each detector separately.

An adapter for post mounting can be attached to the bottom or side surface of the PDB48xC-
AC housing. This adapter supports #8-32 as well as M4 post mounts.

The PDB48xC-AC is supplied with an external linear power supply.
The “Getting Started” section gives an overview of how to set up the PDB48xC-AC Balanced

Amplified Photodetectors. Subsequent sections contain detailed information about principle of
operation, operating suggestions and technical specifications.

4

1.1 Safety

Attention

The safety of any system incorporating the equipment is the responsibility of the assem­bler of the system.

All statements regarding safety of operation and technical data in this instruction manual
will only apply when the unit is operated correctly as it was designed for.

Do not remove covers! Do not open the cabinet. There are no parts serviceable by the
operator inside!

This precision device is only serviceable if properly packed into the complete original
packaging including the plastic foam sleeves. If necessary, ask for replacement pack­aging.

Refer servicing to qualified personnel!
Only with written consent from Thorlabs may changes to single components be made or

components not supplied by Thorlabs be used.

1.2 Ordering Codes and Accessories

PDB480C-AC 1.6 GHz, fixed gain, ultra-low distortion Balanced Amplified Photodetector with

fiber length matched pigtailed InGaAs photo diodes, fiber SMF28

PDB481C-AC 1.0 GHz, fixed gain, ultra-low distortion Balanced Amplified Photodetector with

fiber length matched pigtailed InGaAs photo diodes, fiber HI1060

© 2019 Thorlabs

3

PDB48xC-AC

2 Installation

This section is intended to provide information how to set up quickly the PDB48xC-AC Bal­anced Amplified Photodetectors. More details and advanced features are described in further
sections.

2.1 Parts List

Inspect the shipping container for damage.
If the shipping container seems to be damaged, keep it until you have inspected the contents

and you have inspected the PDB48xC-AC mechanically and electrically.
Verify that you have received the following items within the package:

1. PDB48xC-AC Balanced Amplified Photodetector

2. Adapter Plate with four M2x8 screws and a hex key 1.5, for post-mounting the unit on a
optical table

3. LDS12B power supply (±12 V, 250 mA), switchable to 100 V, 120 V, or 230 V line
voltage

4. Operation manual

2.2 Getting Started

Note

Please check prior to operation, if the indicated line voltage range on the power supply matches
with your local mains voltage! If you want use your own power supply, Thorlabs offers an ap­propriate power connector cable.

· Carefully unpack the unit and accessories. If any damage is noticed, do not use the unit.
Contact Thorlabs and have us replace the defective unit.

· If required, mount the unit on your optical table or application. Therefore, mount the adapter
plate on bottom or side wall using the four M2x8 screws first. The adapter plate has two
mounting holes, M4 and #8-32. The M4 thread is marked. These threads can be used for
mounting onto Thorlabs posts.

· Set the power supply to your local mains voltage (100, 120, or 230 VAC):

· Connect the DC output cable of the power supply to the POWER IN jack.

· Connect the power supply to the AC outlet, turn power supply on

· Connect RF OUTPUT with coaxial cable to the data acquisition device. Please note, that a
50 W impedance device should be used for best RF performance.

· If necessary, connect monitor outputs (MONITOR+, MONITOR-) to measure the optical in-

put power for each channel individually.

© 2019 Thorlabs4

3 Operating Instruction

3 Operating Instruction

· Turn the power switch of the power supply to I. The green LED next to the DC input con­nector indicates correct power supply.

· Connect the optical source(s) to the optical input(s). Please note that the PDB48xC-AC is
designed for FC/APC connectors!

· MONITOR outputs can be used for convenient alignment of a coarse input power balance.
The maximum output voltage swing of the MONITOR outputs is 10V for high impedance
loads. Saturation of the MONITOR outputs will occur at optical input power greater than
1 mW.

· The RF output signal must not exceed the maximum RF OUTPUT power at 1 dB com­pression (see Technical Data ) to avoid saturation.

· For balanced operation illuminate both photodetectors simultaneously and use the
MONITOR outputs to fine-tune the optical power balance by observing voltage on a digital
voltmeter or other low-frequency measurement device.

· After finishing measurements, turn power off.

Attention

12

The damage threshold of the photo diodes is 10 mW (PDB480C-AC) resp. 5 mW (PDB481C­AC)! Exceeding this value will permanently destroy the detector!

3.1 Operating Principle

Thorlabs PDB48xC-AC Balanced Amplified Photodetectors consist of two well-matched, pig­tailed photodiodes and an ultra-low noise, ultra-low distortion high-speed transimpedance amp­lifier that generates an output voltage (RF OUTPUT) proportional to the difference between the
photo currents of the two photodiodes, i.e. the difference between the two optical input signals.

Additionally, the unit has two monitor outputs (MONITOR+ and MONITOR-) to observe the op­tical input power level on each photodiode separately. Due to their increased cut-off frequency,
these outputs can also be used to measure low frequency modulated signals on each detector
separately. This allows a signal normalization up to 3 MHz.

The PDB48xC-AC is powered by an external linear power supply (±12 V, 250 mA - included)
via a PICO M8 power connector.

© 2019 Thorlabs

5

PDB48xC-AC
Below is a functional block diagram of the PDB48xC-AC Balanced Amplified Photodetectors:

3.2 Optical Inputs

The PDB48xC-AC comes with fiber-coupled optical inputs. Both photo detectors are SMF28
(PDB480C-AC) resp. HI1060 (PDB481C-AC) pigtailed and FC/APC connectorized. For this
reason, a free space beam coupling directly to the PDB48xC-AC is not possible

The PDB48xC-AC can be used in balanced mode (both inputs are illuminated) as well as in
single detector mode.

In order to avoid saturation, the output signal level should not exceed the RF output power 1­dB-compression point.

Attention

The damage threshold of the photo diodes is 10 mW (PDB480C-AC) resp. 5 mW (PDB481C­AC)! Exceeding this value will permanently destroy the photo diode!

Note

Take care for clean fiber connectors prior to attach them to the PDB48xC-AC's optical inputs!
Clean and dust free connections are essential to minimize coupling loss and back reflections.

3.3 Electrical Outputs

The Thorlabs PDB48xC-AC has three SMA output connectors:

· MONITOR +

· MONITOR -

· RF OUTPUT

RF OUTPUT delivers an output voltage proportional to the difference between the photo cur­rents of the two photodiodes This voltage can by calculated to:

with:

Â(l

) - responsivity of the photo diode at given wavelength

© 2019 Thorlabs6

3 Operating Instruction

P

opt,1

and P

- optical input power

opt,2

G - transimpedance gain of the RF output

The responsivity Â(l) for a given wavelength can be read from the individual curves in section
Technical Data to estimate the RF OUTPUT voltage. Please note that the given responsivity
curves represent typical values - individual responsivity may deviate.

The maximum RF OUTPUT power is typically + 18 dBm at 1 dB compression. To explain that:
An ideal amplifier would be a linear device - it's gain is constant at any input power level. In
reality, the output power of the amplifier is limited (e.g. by supply voltage). That means, with in­creased input power the amplifier becomes saturated. Before the saturation is reached, a re­duction in gain takes place - the result is a compression effect. The 1 dB compression point is
defined as the output power where the gain is 1 dB less than the small signal gain.

In order to avoid saturation, the output signal level should not exceed this 1-dB-compression
point.

MONITOR Outputs

The signal monitor outputs (MONITOR+ and MONITOR-) allow observation of the input power
level and can be used as individual power indicators. These outputs can also be used to meas­ure RF (up to 3 MHz) modulated signals on each detector separately. The maximum output

voltage swing of the MONITOR output is +10 V for high impedance loads (+1.5 V into 50 W).
Saturation of MONITOR outputs will occur at optical input power level greater than 1 mW, de­pending on the detector's wavelength response.

The amplifier offset voltage is factory set to zero at 23°C ambient temperature. A small drift dur­ing a short warm-up period (~5min) may occur. For exact DC light level measurements a con­stant temperature environment is recommended.

3.4 Mounting

The PDB48xC-AC is housed in a rugged shielded aluminum enclosure.
For post mounting an adapter can be attached to the bottom or side surface using four M2x8

screws (see below). This adapter supports #8-32 as well as M4 post mounts. The M4 tread is
marked.

© 2019 Thorlabs

7

PDB48xC-AC

3.5 CMRR and Frequency Response

An important specification for balanced amplifiers is it's ability to suppress common mode
noise, which is reflected in the Common Mode Rejection Ratio (CMRR). In the setup as de­scribed below, the Device under Test (DuT) - here a PDB48xC-AC - is tested for CMRR. A
common mode signal is generated, which is canceled out when the amplifier is in balanced
mode.

A network analyzer is used as signal generator (output A) and receiver (input B) The receiver is
synchronized with the signal generator and measures selectively at the same frequency. A
laser light source is modulated by the signal generator (port A) and acts as transmitter. To the
laser output a 3 dB fusion coupler is connected, splitting the modulated light signal into two
paths. Depending on the measurement task, one or both coupler outputs are connected to the
inputs of the DuT. The output of the DuT that should be measured is connected to the network
analyzers Port B.

Frequency response measurements

The frequency response of each signal path can be measured by connecting only one coupler
output to the appropriate input. This way, the frequency response curves of the RF OUTPUT
from INPUT + and INPUT- can be measured, as well as the frequency responses of the
MONITOR outputs, as shown in the individual technical data.

CMRR measurement

For Common Mode Rejection measurement, both outputs of the fusion coupler are connected
to both inputs of the DuT. The optical power level at both inputs must be well matched ("bal­anced") in order to achieve the optimal common mode suppression. Now the common mode re­jection can be measured as a function of frequency. The frequency response of the RF
OUTPUT must be considered when calculating the CMRR - it is the difference between the RF
OUTPUT signal at a given frequency and the measured common mode or balanced output sig­nal - at the same frequency. Typical measurement curves can be found in the individual tech­nical data.

© 2019 Thorlabs8

3 Operating Instruction

3.6 Recommendations

Thorlabs PDB48xC-AC Balanced Amplified Photodetectors can eliminate noise sources to al­low precise measurements. The PDB48xC-AC is designed to be used in a dual beam setup:
one optical path for measurement and one invariant reference path. If set up properly, the
PDB48xC-AC can reduce common mode noise for more than 25 dB over the specified fre­quency range. Below are given some recommendations to achieve an optimal common mode
suppression:

· To obtain the maximum possible common mode rejection (common mode noise suppres-

sion), equal power levels on each photodetector are essential. Any power imbalance will be
amplified and hence decrease the possible noise reduction.

· Equal optical path lengths are very important for common mode noise suppression especially

at higher frequencies. Any path length difference will introduce a phase difference between
the two signals, which will decrease the noise reduction capability of the balanced detector.
The figure below shows the maximum allowed path length difference in fiber to obtain a de­sired CMRR.

· Avoid etalon effects (interference fringes caused between two optical surfaces) in optical

paths. Using angle polished optical connectors will greatly reduce etalon effects in a fiber
based setup. Effects like residual frequency modulation, polarization noise, polarization
wiggle or spatial modulation can also degrade common mode noise suppression. For further
details contact Thorlabs. In general, reducing sources of differential losses in the optical
paths (other than the measurement itself) will improve the common mode noise reduction.

· Another critical point can be electrostatic coupling of electrical noise associated with ground

loops. In most cases an electrically isolated post (see Thorlabs parts TRE or TRE/M) will
suppress electrical noise coupling. Always try to identify the electrical noise sources and in­crease the distance to the PDB48xC-AC Balanced Detector. Different common ground points
can also be tested.

© 2019 Thorlabs

9

PDB48xC-AC

4 Maintenance and Service

Protect the PDB48xC-AC from adverse weather conditions. The PDB48xC-AC is not water res­istant.

Attention

To avoid damage to the instrument, do not expose it to spray, liquids or solvents!

The unit does not need a regular maintenance by the user. It does not contain any modules
and/or components that could be repaired by the user himself. If a malfunction occurs, please
contact Thorlabs for return instructions.

Do not remove covers!

To clean the PDB48xC-AC series housing, use a mild detergent and damp cloth. Do not soak
the unit in water or use solvent based cleaners.

Cleaning of the fiber connectors

The photodiodes of the PDB48xC-AC
are pigtailed with single mode fiber
and connectorized by FC/APC con­nectors. Clean and dust-free surfaces
of the ferrule tips are essential to
minimize coupling losses. If the con­nectors are suspected to be soiled,
the ferrule tips can be cleaned this
way:

Remove the two screws (1), fixing the
front part (2) of the switchable ad­apter. Detach the front part (2) an
clean the ferrule tip using a lint-free
tissue damped with alcohol or pro­panol. The ferrule receptacle of the
front part (2) can be cleaned from
dust using compressed air (duster).

When mounting the front adapter, take care for it's correct orientation: The cylindrical key of the
front part must match with it's counterpart in the PDB48xC-AC's housing.

Warning

The screws (3), fixing the base of the switchable adapter to the housing, must not be re­moved!

© 2019 Thorlabs10

5 Appendix

5 Appendix

Comments and explanations to the individual specifications

- Typical responsivity is the responsivity Â(l) of the photo diode at the stated wavelength.

- Transimpedance [V/A] is the ratio of output voltage to photo current, it is wavelength inde-

pendent.

- Conversion gain [V/W] is the ratio of output voltage to input optical power, by other words

G

CONV

= G

TRANS

× Â(l)

This formula shows, that the conversion gain is dependent on the actual wavelength. In
specifications, it is given only for the indicated operating wavelength.

- NEP (Noise Equivalent Power) is stated for 30 kHz to 100 MHz frequency range.

- Overall output voltage noise [V

] is the value which can be measured across a 50 W

RMS

load at large bandwidth, e.g., if connect the RF output to a 50 W terminated scope input.

- Max. input power is the damage threshold of the photo diode.

- Typical noise spectra (diagrams): These spectra were measured using an electrical spec-

trum analyzer (resolution bandwidth 100 kHz, video bandwidth 10 kHz). The INPUTs of the
balanced detectors under test were blocked. The lower curve in the diagram was measured
with the same setup and the balanced detectors under test switched off, i.e., it represents
the measurement system’s noise floor.

- Monitor outputs are designed for use with high impedance loads (e.g., high-Z scope input

etc.), but can also drive 50 W loads. Monitor outputs conversion gain is given for the indic­ated operating wavelength and high impedance load.

- Typical frequency response curves are measured using the setup described in section

"CMRR and Frequency Response"

8

© 2019 Thorlabs

11

PDB48xC-AC

Item #

PDB480C-AC

PDB481C-AC

Detector

Detector Type

InGaAs / PIN

Optical Inputs

FC/APC (SMF28e+ inside)

FC/APC (HI1060 inside)

Coupling Loss

< 0.5 dB (typ. < 0.3 dB)

<1.0 dB (typ. < 0.4 dB)

Operating Wavelength

1300 nm

(1200 - 1700 nm)

1060 nm

(900 - 1400 nm)

Responsivity, typ.

0.85 A/W @ 1300 nm

0.72 A/W @ 1060 nm

Active Detector Diameter

0.075 mm

0.080 mm

Optical Back Reflection

< -40 dB

Photo Diode Damage Threshold

10 mW

5 mW

RF OUTPUT

RF OUTPUT Bandwidth (3dB)

30 kHz to 1.6 GHz

30 kHz to 1.0 GHz

Common Mode Rejection Ratio

>25 dB (typ. >30 dB)

RF OUTPUT Transimpedance Gain

50 W load

16 x 103 V/A

RF OUTPUT Conversion Gain

50 W load

14.4 x 103 V/W @ 1300 nm

11.5 x 103 V/W @ 1060 nm

RF OUTPUT Power at 1 dB compression

50 W load

min. +16.5 dBm

typ. +18 dBm

RF OUTPUT Coupling

AC coupling only

RF Output Impedance

50 W

Minimum NEP (30 kHz to 100 MHz)

Overall Output Voltage Noise

< 9 mV

RMS

< 6.5 mV

RMS

MONITOR Outputs

MONITOR Output Impedance

200 W

MONITOR Output Bandwidth (3 dB)

DC to 3 MHz

MONITOR Output Conversion Gain

High Z load

9 V/mW @ 1300 nm

7.2 V/mW @ 1060 nm

MONITOR Output Voltage Swing

High Z load

max. 10 V

Overall Output Voltage Noise

< 0.65 mV

RMS

DC Offset

< ± 2 mV

General

Electrical Outputs

SMA

DC Power Supply

± 12V @ 250mA

Operating Temperature Range 1)

0 - 40 °C

Storage Temperature Range

-40 to 70 °C

Dimensions (W x H x D)

85 mm x 80 mm x 30 mm

Weight

0.35

5.1 Technical Data

1

) non-condensing

Values for transimpedance and conversion gain are lossless gain values, i.e., losses introduced by FC/APC con­nectors (typically 0.15 to 0.35 dB) are not considered.

All technical data are valid at 23 ± 5°C and 45 ± 15% rel. humidity (non condensing)

© 2019 Thorlabs12

5.1.1 Individual Diagrams PDB480C-AC

PDB480C-AC - Typical Detector Responsivity

PDB480C-AC - Typical RF OUTPUT Frequency Response

5 Appendix

© 2019 Thorlabs

13

PDB48xC-AC

PDB480C-AC - Typical MONITOR Output Frequency Response

PDB480C-AC - Typical RF-OUTPUT Spectral Noise

© 2019 Thorlabs14

5.1.2 Individual Diagrams PDB481C-AC

PDB481C-AC - Typical Detector Responsivity

PDB481C-AC - Typical RF OUTPUT Frequency Response

5 Appendix

© 2019 Thorlabs

15

PDB48xC-AC

PDB481C-AC - Typical MONITOR OUTPUT Frequency Response

PDB481C-AC - Typical RF-OUTPUT Spectral Noise

© 2019 Thorlabs16

5.2 Dimensions

PDB48xC-AC Mechanical Drawing

5 Appendix

© 2019 Thorlabs

17

PDB48xC-AC

5.3 Certifications and Compliances

© 2019 Thorlabs18

5 Appendix

5.4 Warranty

Thorlabs warrants material and production of the PDB48xC-AC for a period of 24 months start­ing with the date of shipment. During this warranty period Thorlabs will see to defaults by repair
or by exchange if these are entitled to warranty.

For warranty repairs or service the unit must be sent back to Thorlabs. The customer will carry
the shipping costs to Thorlabs, in case of warranty repairs Thorlabs will carry the shipping costs
back to the customer.

If no warranty repair is applicable the customer also has to carry the costs for back shipment.
In case of shipment from outside EU duties, taxes etc. which should arise have to be carried by

the customer.
Thorlabs warrants the hard- and/or software determined by Thorlabs for this unit to operate

fault-free provided that they are handled according to our requirements. However, Thorlabs
does not warrant a fault free and uninterrupted operation of the unit, of the software or firmware
for special applications nor this instruction manual to be error free. Thorlabs is not liable for
consequential damages.

Restriction of Warranty

The warranty mentioned before does not cover errors and defects being the result of improper
treatment, software or interface not supplied by us, modification, misuse or operation outside
the defined ambient stated by us or unauthorized maintenance.

Further claims will not be consented to and will not be acknowledged. Thorlabs does explicitly
not warrant the usability or the economical use for certain cases of application.

Thorlabs reserves the right to change this instruction manual or the technical data of the de­scribed unit at any time.

5.5 Copyright and Exclusion of Reliability

Thorlabs has taken every possible care in preparing this document. We however assume no li­ability for the content, completeness or quality of the information contained therein. The content
of this document is regularly updated and adapted to reflect the current status of the hardware
and/or software. We furthermore do not guarantee that this product will function without errors,
even if the stated specifications are adhered to.

Under no circumstances can we guarantee that a particular objective can be achieved with the
purchase of this product.

Insofar as permitted under statutory regulations, we assume no liability for direct damage, indir­ect damage or damages suffered by third parties resulting from the purchase of this product. In
no event shall any liability exceed the purchase price of the product.

Please note that the content of this document is neither part of any previous or existing agree­ment, promise, representation or legal relationship, nor an alteration or amendment thereof. All
obligations of Thorlabs result from the respective contract of sale, which also includes the com­plete and exclusively applicable warranty regulations. These contractual warranty regulations
are neither extended nor limited by the information contained in this document. Should you re­quire further information on this product, or encounter specific problems that are not discussed
in sufficient detail in the document, please contact your local Thorlabs dealer or system in­staller.

All rights reserved. This document may not be reproduced, transmitted or translated to another
language, either as a whole or in parts, without the prior written permission of Thorlabs.

Copyright © Thorlabs 2019. All rights reserved.

© 2019 Thorlabs

19

PDB48xC-AC

US
A, Canada, and South America

Thorlabs, Inc.
56 Sparta Avenue
Newton, NJ 07860
USA
Tel: [phone]
Fax: [phone]

www.thorlabs.com
www.thorlabs.us (West Coast)

Email: [e-mail]
Support: [e-mail]

UK and Ireland

Thorlabs Ltd.
1 Saint Thomas Place, Ely
Cambridgeshire CB7 4EX
United Kingdom
Tel: [phone]
Fax: [phone]

www.thorlabs.com

Email: [e-mail]
Support: [e-mail]

Europe

Thorlabs GmbH
Hans-Böckler-Str. 6
85221 Dachau
Germany
Tel: [phone]
Fax: [phone]

www.thorlabs.de

Email: [e-mail]

Scandinavia

Thorlabs Sweden AB
Bergfotsgatan 7
431 35 Mölndal
Sweden
Tel: [phone]
Fax: [phone]

www.thorlabs.com

Email: [e-mail]

France

Thorlabs SAS
109, rue des Côtes
78600 Maisons-Laffitte
France
Tel: [phone]
Fax: [phone]

www.thorlabs.com

Email: [e-mail]

Brazil

Thorlabs Vendas de Fotônicos Ltda.
Rua Riachuelo, 171
São Carlos, SP 13560-110
Brazil
Tel: [phone]
Fax: [phone]

www.thorlabs.com

Email: [e-mail]

Japan

Thorlabs Japan, Inc.
3-6-3 Kitamachi
Nerima-ku, Tokyo 179-0081

Japan

Tel: [phone]
Fax: [phone]

www.thorlabs.co.jp

Email: [e-mail]

China

Thorlabs China
Room A101, No. 100
Lane 2891, South Qilianshan Road
Putuo District
Shanghai 200331
China
Tel: [phone]
Fax: [phone]

www.thorlabs.com

Email: [e-mail]

5.6 Thorlabs Worldwide Contacts and WEEE Policy

Thorlabs verifies our compliance with the WEEE (Waste Electrical and Electronic Equip­ment) directive of the European Community and the corresponding national laws. Ac­cordingly, all end users in the EC may return “end of life” Annex I category electrical and
electronic equipment sold after August 13, 2005 to Thorlabs, without incurring disposal
charges. Eligible units are marked with the crossed out “wheelie bin” logo (see right),
were sold to and are currently owned by a company or institute within the EC, and are
not dissembled or contaminated. Contact Thorlabs for more information. Waste treat­ment is your own responsibility. “End of life” units must be returned to Thorlabs or
handed to a company specializing in waste recovery. Do not dispose of the unit in a litter
bin or at a public waste disposal site.

© 2019 Thorlabs20

www.thorlabs.com