THORLABS PDB570C User manual

Balanced Amplified Photodetectors
PDB570C
Operation Manual
2019

Version:
Date:
Item No.:
1.2
08-Apr-2019
M0009-510-826
Copyright © 2019 Thorlabs

Foreword
Contents 2
1 General Information 3
31.1 Safety 31.2 Ordering Codes and Accessories
2 Installation 4
42.1 Parts List 42.2 Getting Started
3 Operating Instruction 6
63.1 Operating Principle 73.2 Operating Elements 73.3 Operating Modes 73.3.1 Single Detector Mode 83.3.2 Balanced Mode 83.3.3 Auto-Balanced Mode 93.4 Optical Inputs 93.5 Electrical Outputs 103.6 Mounting 113.7 CMRR and Frequency Response 123.8 Recommendations
4 Maintenance and Service 15
5 Appendix 16
175.1 Technical Data 185.2 Individual Diagrams PDB570C 215.3 Dimensions 225.4 Certifications and Compliances 235.5 Warranty 235.6 Copyright and Exclusion of Reliability 245.7 Thorlabs 'End of Life' Policy (WEEE) 255.8 Thorlabs Worldwide Contacts

© 2019 Thorlabs
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.
Please read this advice carefully!
This manual also contains "NOTES" and "HINTS" written in this form.
Attention
Paragraphs preceded by this symbol explain hazards that could
damage the instrument and the connected equipment or may cause
loss of data.
Note
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© 2019 Thorlabs
1 General Information
3
1 General Information
Thorlabs PDB570C Balanced Amplified Photodetectors consist of two well-matched, fiber
coupled avalanche photodiodes with length matched fibers and an ultra-low noise, ultra-low dis-
tortion 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 op-
tical input signals.
Distinguished properties of the PDB570C are it's exceptionally low NEP, optical gain control
and auto-balancing function with a variable closed loop control velocity.
Additionally, the unit has a CONTROL OUTPUT that allows to monitor the auto-balancing con-
trol loop signal.
An adapter for post mounting can be attached to the bottom or side surface of the PDB570C
housing. This adapter supports #8-32 as well as M4 post mounts.
The PDB570C is supplied with an external linear power supply.
The “Getting Started” section gives an overview of how to set up the PDB570C Balanced
Amplified Photodetectors. Subsequent sections contain detailed information about principle of
operation, operating suggestions and technical specifications.
1.1 Safety
Attention
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.
All modules must only be operated with proper shielded connection cables.
Only with written consent from Thorlabs may changes to single components be carried
out or components not supplied by Thorlabs be used.
This precision device is only serviceable if properly packed into the complete original
packaging including the plastic foam sleeves. If necessary, ask for a replacement pack-
age.
Warning
Do not remove covers! The PDB570C operates with high voltages.
1.2 Ordering Codes and Accessories
PDB570C 400 MHz ultra-low noise, variable optical gain auto-balanced amplified photo-
detector with fiber length matched pigtailed InGaAs avalanche photo diodes,
fiber SMF28
10
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© 2019 Thorlabs4
PDB570C
2 Installation
This section is intended to provide information how to set up quickly the PDB570C Balanced
Amplified Photodetectors. More details and advanced features are described in further sec-
tions.
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 PDB570C mechanically and electrically.
Verify that you have received the following items within the package:
1. PDB570C 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 (±12V, 250 mA), switchable to 100 V, 120 V or 230 V line voltage
4. Operation manual
2.2 Getting Started
Attention
Please check prior to operation, if the indicated line voltage range on the power supply matches
with your local mains voltage to avoid damages to the AC power supply.
If you want use your own power supply, Thorlabs offers an appropriate DC power 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 VAC, 120 VAC, 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 Wimpedance device should be used for best RF performance.

© 2019 Thorlabs
2 Installation
5
·For operation in AUTO BAL mode, it is helpful to connect the CONTROL OUTPUT to an
oscilloscope to monitor the control loop feedback signal. The CONTROL OUTPUT is de-
signed for high impedance loads, but works also on 50 Wload.
·Turn the power switch of the power supply to "I". The green LED next to the DC input con-
nector indicates correct power supply.
·Connect the optical source(s) to the optical input(s). Please note that the PDB570C is de-
signed for FC/APC connectors!
·Select the desired operation mode using the mode selector switch "RF OUTPUT". For a de-
tailed description, please see section Operating Modes .
·After the measurements are finished, turn power off.
Attention
The damage threshold of the photo diodes is 200 µW! Exceeding this value will permanently
destroy the detector!
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© 2019 Thorlabs6
PDB570C
3 Operating Instruction
3.1 Operating Principle
Thorlabs PDB570C Balanced Amplified Photodetectors consist of two well-matched, pigtailed
avalanche photodiodes (APD) and an ultra-low noise, ultra-low distortion high-speed transim-
pedance 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. The fiber lengths of the photo diodes are matched to minimize optical path length
differences between the input connectors and the APD's active area.
Additionally, the optical gain of the photo diodes can be manually controlled by changing the
bias voltage of the APD. This optical gain control is used as well for the auto-balancing func-
tion. In auto-balanced mode, a control output allows to monitor the control loop signal. The ve-
locity of the control loop is adjustable.
The PDB570C is powered by an external linear power supply (±12 V, 250 mA - included) via a
PICO M8 power connector.

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3 Operating Instruction
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3.2 Operating Elements
INPUT + / INPUT -
FC/APC inputs; inside SMF28 fiber
CONTROL OUTPUT
SMA Output of the loop control signal
RF OUTPUT
SMA, Main signal output with respect to the selected mode
DC INPUT
Power supply
OPTICAL GAIN
Control the optical gain of the photo detectors
CONTROL VELOCITY
Adjust control loop velocity
Switch RF OUTPUT
Operating mode selector
3.3 Operating Modes
The PDB570C offers three different operating modes:
3.3.1 Single Detector Mode
In single detector mode, both inputs can be connected to a signal source. Set the mode switch
to INPUT+ or INPUT- depending on what input should be monitored at RF OUTPUT.
Use OPTICAL GAIN control to adjust the RF OUTPUT signal level. Monitoring of the input sig-
nals is helpful to adjust the experimental setup for equal input power levels prior to continue
measurements in BAL or AUTO-BAL mode.
Notes
·In single detector mode, CONTROL VELOCITY and CONTROL OUTPUT are disabled.
·In single detector mode, the bandwidth is limited to 300 MHz with a slight gain peak (see
typical diagrams )
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© 2019 Thorlabs8
PDB570C
·When adjusting optical gain, make sure not to saturate the amplifier. The RF OUTPUT
voltage swing must not exceed ±2.1 V (50 Wload) resp. ±4.2 V (high Z load)!
·The other input, that is not in use, will be muted. However, due to the operating principle
of the optical gain control, the not selected input will not be completely switched off, it re-
mains active with a very weak sensitivity.
Attention
Make sure not to exceed the maximum input power of 200 µW! Higher power level may destroy
the photo detector!
3.3.2 Balanced Mode
Set the mode switch to BAL. This mode is equivalent to a standard balanced detector, with the
difference that the optical gain can be adjusted for both inputs simultaneously by a factor 4 (M
= 2.5 to 10). The balance needs to be achieved by adjusting the input power levels and ob-
serving the difference signal at the RF OUTPUT.
Note
In balanced mode, CONTROL VELOCITY and CONTROL OUTPUT are disabled.
Attention
Make sure not to exceed the maximum input power of 200 µW! Higher power level may destroy
the photo detector!
3.3.3 Auto-Balanced Mode
Set the mode switch to AUTO-BAL.
In auto balanced mode, CONTROL VELOCITY and CONTROL OUTPUT are active. The
OPTICAL GAIN control affects only INPUT-, while INPUT+ is controlled by the control loop sig-
nal for power balance. An outstanding feature of the PDB570C is the gain control to lower as
well as to higher values. That means, that it's not significant which of the two input signals has
the higher level. However, the gain control is limited to the optical gain adjustment range and is
affected by the actual Optical Gain setting. If the input signal power imbalance is greater than
the optical gain adjustment range, AUTO-BAL cannot operate properly.
A good starting point to achieve an optimal auto-balancing performance is if the input power
levels are close each to the other and the Optical Gain of INPUT- is set to a medium value.
In order to achieve optimal measurement results, set OPTICAL GAIN to medium value (or in
accordance with power ratio between the inputs). Set the CONTROL VELOCITY to minimum
for a maximum control loop stability. Depending on the input conditions higher CONTROL
VELOCITY settings may lead to better noise suppression and should be figured out experi-
mentally.
Note
If the input power difference is too large and/or the loop velocity is set too high, oscillations of
the control loop may appear.
Attention
Make sure not to exceed the maximum input power of 200 µW! Higher power level may destroy
the photo detector!

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3 Operating Instruction
9
3.4 Optical Inputs
The PDB570C comes with fiber-coupled optical inputs. Both photo detectors are SMF28 pig-
tailed and FC/APC connectorized. For this reason, a free space beam coupling directly to the
PDB570C is not possible. However, if the PDB570C shall be used with open beam, we recom-
mend Thorlabs' pigtailed aspheric collimators CFS18-1310-APC or similar.
For details about operating wavelength range, spectral responsivity etc. please see the explan-
ations in section Appendix and the subsequent specifications and diagrams.
The PDB570C 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 max. RF OUTPUT
voltage swing! This can be achieved by reducing the optical input power or the optical gain set-
ting.
Attention
The damage threshold of the photo diodes is 200 µW! Exceeding this value will permanently
destroy the photo diode!
Note
Take care for clean fiber connectors prior to attach them to the PDB570C's optical inputs!
Clean and dust free connections are essential to minimize coupling loss and back reflections.
Using other than SMF28 fibers at the input may lead to increase of coupling loss.
3.5 Electrical Outputs
The Thorlabs PDB570C has two SMA output connectors:
·CONTROL OUTPUT
·RF OUTPUT
RF OUTPUT delivers an output voltage proportional to the difference between the photo cur-
rents of the two photodiodes. This voltage can be calculated to:
URF, OUT = (PINPUT+ - PINPUT- ) x  ( l ) x GTRANS x M
with: Â ( l )- responsivity of the photo diode at given wavelength
PINPUT+ and PINPUT- - optical input power
GTRANS - transimpedance gain of the RF output
M - APD multiplication (optical gain) factor; adjustable between 2.5 and 10.
The responsivity  ( l )for a given wavelength can be read from the individual curve in section
Individual Diagrams to estimate the RF OUTPUT voltage. Please note that the given re-
sponsivity curve represents typical values - individual responsivity may vary.
The maximum output voltage swing of the RF OUTPUT is ± 4.2 V for high impedance loads
and ±2.1 V into 50 W.
Note
It is recommended to use the RF OUTPUT with 50 Wload, as the performance is optimized for
this termination. A high impedance load can be connected, but in this case distortions will ap-
pear in case of broadband signals.
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PDB570C
CONTROL OUTPUT
The CONTROL OUTPUT is active in auto-balanced mode only and delivers an output voltage
proportional to the feedback loop control signal. It is a measure for the power imbalance of the
optical input signals. In the case, that the input signal spectrum contains low frequency com-
ponents, the control output will reproduce these components while they are suppressed at the
RF-OUTPUT in auto-balanced condition. The CONTROL VELOCITY setting determines the
cutoff frequency for the low frequency components.
The maximum output swing of the CONTROL OUTPUT of ± 4.7V is reached with high Z loads
only. 50 Wloads are possible, but in this case the output voltage drops to 5% due to the internal
source impedance. The monitoring of the CONTROL OUTPUT signal is also recommended to
ensure that the control loop does not oscillate due to critical conditions .
Further, as the the auto balance loop is able to "filter out" low frequency components of the bal-
anced signal, the CONTROL OUTPUT signal may contain relevant measurement information,
for example in swept source absorption measurements.
3.6 Mounting
The PDB570C 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.
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3 Operating Instruction
11
3.7 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 de-
scribed below, the Device under Test (DuT) - here a PDB570C - is tested for CMRR. A com-
mon mode signal is generated, which is canceled out when the amplifier is in balanced or auto-
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 RF OUTPUT of the DuT is connected to the network analyzers Port B.
Frequency response measurements
Depending on the setting of the operation mode selector , the frequency responses of each
signal path can be measured:
INPUT+ and INPUT- : both coupler outputs can be connected and the signal path, that should
be measured, is selected by the operation mode selector.
BAL mode: the frequency response is measured by connecting only one coupler output to the
appropriate input.
AUTO-BAL-mode: The frequency response curve in AUTO-BAL mode is identical to BAL-
mode. Frequency response measurements should be made in BAL-mode only.
The frequency response curves of the RF OUTPUT from INPUT + and INPUT- and in BAL
mode are shown in the individual diagrams .
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 ("bal-
anced") in order to achieve the optimal common mode suppression in BAL mode. In the AUTO-
BAL mode, the optical power levels at both inputs can be slightly different. 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 sig-
nal - at the same frequency. Typical measurement curves can be found in the individual dia-
grams .
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PDB570C
3.8 Recommendations
Thorlabs PDB570C Balanced Amplified Photodetectors can eliminate noise sources to allow
precise measurements. The PDB570C is designed to be used in a fiber based setup: one op-
tical path for measurement and one invariant reference path. If set up properly, the PDB570C
can reduce common mode noise for more than 30 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. In BAL mode, a manual adjust-
ment is necessary while in AUTO-BAL mode the power imbalance should not exceed the ad-
justment range of the OPTICAL GAIN to allow automatic power balance.
·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 de-
sired 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 sup-
press electrical noise coupling. Always try to identify the electrical noise sources and increase

© 2019 Thorlabs
3 Operating Instruction
13
the distance to the PDB570C Balanced Detector. Different common ground points can also
be tested.
·APD are particularly suitable for measurement of very low power. But the higher the optical
gain and the higher the input power, the higher is the noise generated in the APD, this way
impacting the NEP. This increment is known as "excess noise" and characterized by the Ex-
cess Noise Factor (ENF). It describes the statistical noise that is inherent with the stochastic
APD multiplication process.
·The non-linearity of the used APD leads to a decrease of the PDB570C conversion gain, par-
ticularly at high optical gain and high input power levels:
Above diagram shows the dependency of the RF OUTPUT voltage of optical input power.
The dotted lines show the theoretical curves that are calculated (see the formula ), while
the solid lines represent the measured values. The reason for this behavior is that the APD
multiplication factor (optical gain) depends not only on the applied reverse voltage, but also
on the incident optical power. As a consequence, it is recommended to keep the optical
power level as low as possible, particularly when operating with high optical gain.
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PDB570C
Control Velocity Setting
The output signal of the transimpedance amplifier represents the current imbalance between
the two optical inputs. In auto-balanced mode, this imbalance signal is used as the input signal
of the control loop. Depending on the polarity of the imbalance, the output signal of the loop
amplifier decreases (PINPUT+ > PINPUT- ) or increases (PINPUT+ < PINPUT- ) the optical gain of
INPUT+. The control loop velocity defines how fast the loop reacts - the higher the velocity, the
faster the loop. By other words, the auto balance control loop can suppress low frequency com-
ponents of the balanced signal at the RF OUTPUT, while the CONTROL VELOCITY setting
defines the "upper cut frequency". However, the loop velocity depends also on the following
confounding factors:
·optical gain, set for INPUT-
·ratio of input power levels
·absolute input power level
·modulation depth of of the disturbance signal
This means, that the loop velocity varies depending on above stated factors. For this reason,
the CONTROL VELOCITY is not graduated in bandwidth values.

© 2019 Thorlabs
4 Maintenance and Service
15
4 Maintenance and Service
Note
The detector performance may suffer from dirty or dusty fiber connectors. This might be the
cause for reduced overall performance or loss of balance between the detectors. Therefore,
when fiber connectors are frequently un- and replugged, please clean the fiber connectors as
described below.
Cleaning of the fiber connectors
The photodiodes of the PDB570C are
pigtailed with a single mode fiber and
connect to fibers with FC/APC con-
nectors. Clean and dust-free surfaces
of the ferrule tips are essential to
minimize coupling losses and to keep
the two detectors balanced. If the
connectors are suspected to be dirty,
please follow these instructions:
Remove the two screws (1), which
hold the front part (2) of the switch-
able adapter. Detach the front part (2)
and remember the correct orientation.
Clean the ferrule tip using a lint-free
tissue damped with alcohol or iso-pro-
panol. Clean the ferrule receptacle of
the front part from dust using com-
pressed air.
When remounting the front adapter, ensure its correct orientation: The cylindrical key of the
front part must match with its counterpart in the PDB570C housing.
Warning
Never remove the screws (3), fixing the base of the switchable adapter to the housing!
Note
Aside from this, 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. If other malfunctions oc-
cur, please contact Thorlabs.
Warning
Do not remove housing covers! The PDB570C operates with high voltages!
Protect the PDB570C from adverse weather conditions. The PDB570C is not water resistant.
Attention
To avoid damage to the instrument, do not expose it to spray, liquids or solvents! To
clean the PDB570C housing, use a damp cloth. Do not soak the unit in water or use solvent
based cleaners.

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PDB570C
5 Appendix
Comments and explanations to the individual specifications
-Operating Wavelength The operating wavelength range is 1200 to 1700 nm. The optimal
performance is reached between 1260 and 1625 nm due to the SMF28 fiber properties.
However, the photo detectors operate within the 900 to 1700 nm range. Away from the op-
timum wavelength range 1260 to 1625nm, the fiber pigtails may introduce a higher insertion
loss (particularly, between the two optical windows of the used SMF28 fiber and beyond
1625 nm) or the light will propagate multi-modal (below the SMF28 cut-off wavelength of
1240 nm).
-Typical responsivity is the responsivity Â(l) of the photo diode at the stated wavelength.
-Transimpedance gain [V/A] is the ratio of output voltage to photo current, it is wavelength
independent and independent from optical gain. The value is given into a high impedance
load. For 50 Wload at RF output, the value is divided by 2.
-Optical Gain M is the adjustable (optical) gain of the photo detector.
-Conversion gain [V/W] is the ratio of output voltage to input optical power, by other words
GCONV = GTRANS × Â(l) × M
This formula shows, that the conversion gain is dependent on the actual wavelength. In
specifications, it is given only for the indicated operating wavelength. The value is given into
a high impedance load. For 50 Wload at RF output, the value is divided by 2.
-NEP (Noise Equivalent Power) is stated for DC to 100 MHz frequency range.
-Overall output voltage noise [VRMS] is the value which can be measured across a 50 W
load at large bandwidth and maximum optical gain, 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. The electrical noise is independent of the optical
gain setting!
-Typical frequency response curves are measured using the setup described in section
"CMRR and Frequency Response"
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5 Appendix
17
5.1 Technical Data
Item #
PDB570C
Detector
Detector Type
InGaAs / APD
Optical Inputs
FC/APC (SMF28e+ inside)
Coupling Loss
< 0.5 dB (typ. < 0.3 dB)
Operating Wavelength
1300 nm
(1200 - 1700 nm)
Max. Responsivity, typ. 1)
0.9 A/W @ 1300 nm
Optical Back Reflection
< -40 dB
Max. Input Power 2)
200 µW
RF OUTPUT
Bandwidth (3dB; Balanced / Auto-Balanced)
DC to 400 MHz
Bandwidth (3dB; INPUT + / INPUT -)
DC to 300 MHz
Common Mode Rejection Ratio
>25 dB (typ. >35 dB)
Transimpedance Gain, High Z
2 x 103V/A
Optical Gain Factor
2.5 to 10, adjustable
Conversion Gain at 1300 nm
4.5 x 103to 18.0 x 103V/W
CW Saturation Power 2)
200 µW @ 1300 nm
RF Output Coupling
DC coupling only
RF Output Impedance
50 W
RF Output Voltage Swing, max.
± 4.2 V (High Z load)
± 2.1 V (50 Wload)
Minimum NEP (DC to 100 MHz) 2)
Overall Output Voltage Noise
< 0.4 mVRMS
DC Offset, typ.
±3 mV
CONTROL Output
CONTROL Output Impedance
1 kW
CONTROL Output Voltage Swing, High Z load
max. ±4.7 V
General
Electrical Outputs
SMA
DC Power Supply
± 12V @ 250mA
Operating Temperature Range 3)
0 - 40 °C
Storage Temperature Range
-40 to 70 °C
Dimensions without connectors (W x H x D)
95 mm x 80 mm x 44.3 mm
Weight
0.37 kg
1) at M=1
2) at maximum optical gain (M=10)
3) non-condensing
Values for transimpedance and conversion gain are lossless gain values, i.e., losses introduced by FC/APC con-
nectors (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)

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PDB570C
5.2 Individual Diagrams PDB570C
PDB570C - Typical Detector Responsivity
PDB570C Typical RF Output Frequency Response
(Single Detector Mode, Gain M=5)