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Balanced Amplified Photodetectors with Fast Monitor Output


  • Models Available with Bandwidths up to 1.6 GHz
  • Noise Cancellation by Subtraction of 2 Input Signals
  • >20 dB Common Mode Rejection
  • Fast Monitor Outputs

PDB410A

PDB450C

Power Supply Included

PDB440C

Related Items

Typical Applications

  • Spectroscopy
  • Heterodyne Detection
  • Optical Coherence Tomography OCT
  • Optical Delay Measurements
  • THz Detection
Balanced Detector with Fast Monitor Output
Bandwidth Available
Wavelength Ranges
Fast Monitor
Output Bandwidth
Gain
Switchable
(DC - 0.1, 0.3, 4,
45, or 150 MHz)
320 to 1000 nm
or
800 - 1700 nm
DC - 1 MHz Switchable
DC - 15 MHz Fixed
DC - 75 MHz
DC - 100 MHz
DC - 200 MHz
DC - 350 MHz
DC - 400 MHz Optimized for 1060 nm
(900 - 1400 nm Range)
or
Optimized for 1300 nm
(1200 - 1700 nm Range)
DC - 3 MHz
30 kHz - 1.0 GHz Optimized for 1060 nm
(900 - 1400 nm Range)
30 kHz - 1.6 GHz Optimized for 1300 nm
(1200 - 1700 nm Range)

Features

  • Four Wavelength Ranges Available
    • 320 - 1000 nm
    • 800 - 1700 nm
    • 900 - 1400 nm (Optimized for 1060 nm)
    • 1200 - 1700 nm (Optimized for 1300 nm)
  • >20 dB Common Mode Rejection
  • Fast Monitor Outputs
  • <9 mVRMS Output Voltage Noise
  • Choose a Si or InGaAs Detector
  • Fiber Inputs Available in All Versions
  • Free Space Inputs Available on Some Detectors (See Below for Details)
  • Switchable Power Supply Included
  • Switchable Transimpedance Gain Version Available

These balanced photodetectors act as a balanced receiver by subtracting the two optical input signals from each other, resulting in the cancellation of common mode noise. This allows small changes in the signal path to be extracted from the interfering noise floor.

The detectors consist of two balanced photodiodes and an ultra-low-noise, high-speed transimpedance amplifier. The two photodiodes are matched to achieve an excellent common mode rejection ratio (CMRR), leading to better noise reduction. Please see the Operation tab for more details. All of these detectors incorporate three fast monitor ports for reduced noise. In addition to the RF-output from the transimpedance amplifier, the Monitor+ and Monitor- ports allow the response of each photodiode to be observed individually.

Bandwidths of DC - 350 MHz or Lower
Detectors with bandwidths of DC - 350 MHz or lower are available with either Si or InGaAs photodiodes for the 320 - 1000 nm or 800 - 1700 nm range, respectively. They contain non-fiber-coupled sensors and come with two removable FC input connectors, making them suitable for either free space or fiber-coupled applications. Although the PDB460 and PDB430 detectors also contain non-fiber-coupled sensors, the FC/PC adapters at the inputs cannot be removed. If desired, these detectors can also be ordered with AC coupling (add -AC to the item number) to block any DC offset.

Bandwidths of DC - 400 MHz or Higher
Detectors with bandwidths of DC - 400 MHz or higher feature fiber-coupled photodiodes connected to FC/APC optical inputs with exactly length-matched SMF-28e+ or HI1060 fiber to achieve excellent CMRR values across the full detector bandwidth. All of these detectors incorporate InGaAs photodiodes and are optimized for either 1060 nm (900 - 1400 nm range) or 1300 nm (1200 - 1700 nm range). The DC versions of these detectors are recommended for OCT applications, as the fiber-coupled design suppresses line artifacts in the OCT image, which generally occur when detector coupling optics are used.

Our highest bandwidth balanced detectors (PDB480C-AC and PDB4801C-AC) are offered in an AC version only and are the latest design for OCT balanced amplified photodetectors. They offer bandwidths from 30 kHz up to 1.6 GHz or 1.0 GHz, respectively, leading to considerable speed improvements. The ultra low distortion output stage supports up to a 2 Vp-p A/D card input range, which, combined with the fiber-coupled design, improves the image quality for OCT applications considerably.

AC-Coupled Version (-AC)
To block the CW component (the unmodulated part) of the optical input signal, an AC-coupled version of each detector is offered. This improves the ability to measure a comparably weak, frequency-modulated signal over a strong CW background signal that could saturate the amplifier.

Electrical Connectors
Three SMA electrical connectors provide the balanced output signal plus a fast power monitor for each of the two input signals. These two monitors enable the control of the input power levels and can be used as an independent power meter for each channel.

Packaging/Power Supply
Housed in a shielded aluminum enclosure measuring 85 mm x 80 mm x 30 mm (3.35" x 3.15" x 1.18"), these detectors are post mountable using the included adapter plate, which can be attached to the bottom or side of the housing with the included 8-32 (M4) screws. The unit is powered with the provided ±12 V DC power supply. The input voltage of 115 V or 230 V can be manually selected by a switch.

Thorlabs also offers Fiber-Based Interferometers, which feature an integrated balanced detector. If you are primarily interested in using our balanced detectors with OCT systems, a condensed list of detectors suitable for this application an be found here.

Item #PDB410APDB410CPDB420APDB420CPDB430APDB430C
Detector Type Si/PIN InGaAs/PIN Si/PIN InGaAs/PIN Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm 320 - 1000 nm 800 - 1700 nm 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.53 A/W 1.0 A/W 0.53 A/W 1.0 A/W 0.50 A/W 1.0 A/W
Active Detector Diameter 0.8 mm 0.3 mm 0.8 mm 0.3 mm 0.4 mm 0.15 mm
Bandwidth (3 dB) DC - 100 MHz DC - 75 MHz DC - 350 MHz
Common Mode Rejection Ratio >25 dB (Typical >35 dB) >35 dB >20 dB (Typical >25 dB)
Transimpedance Gaina 50 x 103 V/A 250 x 103 V/A 10 x 103 V/A
Minimum NEP 7 pW/Hz1/2
(DC - 10 MHz)
3.8 pW/Hz1/2
(DC - 10 MHz)
6.5 pW/Hz1/2
(DC - 10 MHz)
3.5 pW/Hz1/2
(DC - 10 MHz)
13.5 pW/Hz1/2
(DC - 100 MHz)
7 pW/Hz1/2
(DC - 100 MHz)
Integrated Noise (DC - 100 MHz) 100 nWRMS 65 nWRMS 77 nWRMS 47 nWRMS 505 nWRMS 256 nWRMS
Overall Output Voltage Noise 2 mVRMS 2.2 mVRMS 7 mVRMS 7.7 mVRMS 1.4 mVRMS 1 mVRMS
RF Output
Conversion Gain RF-Outputa,b 26.5 x 103 V/W 50 x 103 V/W 133 x 103 V/W 250 x 103 V/W 5 x 103 V/W 10 x 103 V/W
CW Saturation Power RF-Output 135 µW @ 820 nm 72 µW @ 1550 nm 27 µW @ 820 nm 15 µW @ 1550 nm 720 µW @ 820 nm 360 µW @ 1550 nm
Impedance 50 Ω
Max Voltage Swing ±1.8 V for 50 Ω Load
±3.6 V for High-Impedance Load
DC Offset < ±3 mV
RF-Output Coupling DC, AC-Coupling upon Request
Monitor Outputs
Conversion Gain Monitor Outputs 10 V/mW @ 820 nm 10 V/mW @ 1550 nm 10 V/mW @ 820 nm 10 V/mW @ 1550 nm 10 V/mW @ 820 nm 10 V/mW @ 1550 nm
Impedance 220 Ω
Max Voltage Swing 1.55 V for 50 Ω Load
10 V for High-Impedance Load 
Bandwidth DC to 1 MHz
Voltage Noise <180 µVRMS
DC Offset < ±2 mV
General
Fiber Optical Inputsc FC/PC or FC/APC
(Removable)
FC/PC or FC/APC
(Not Removable)
Photodiode Damage Threshold 20 mW
Electrical Outputs SMA (Qty. 3)
Dimensions 85 mm x 80 mm x 30 mm (3.35" x 3.15" x 1.18")
Weight 0.35 kg (without Power Supply)
Operating Temperature Ranged 0 to 40 °C
Storage Temperature Range -40 to 70 °C
Power Supply ±12 V @ 200 mA
  • Value is given for high-impedance load. For a 50 Ω load, divide the value by 2.
  • Given at detector peak responsivity.
  • For PDB430C FC and PDB460C the FC adapter is NOT removable.
  • Non-condensing.
Item #PDB440APDB440CPDB450APDB450CPDB460APDB460C
Detector Type Si/PIN InGaAs/PIN Si/PIN InGaAs/PIN Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm 320 - 1000 nm 800 - 1700 nm 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.53 A/W 1.0 A/W 0.53 A/W 1.0 A/W 0.50 A/W 1.0 A/W
Active Detector Diameter 0.8 mm 0.3 mm 0.8 mm 0.3 mm 0.4 mm 0.15 mm
Bandwidth (3 dB) DC - 15 MHz DC - 150, 45, 4, 0.3, 0.1 MHz DC - 200 MHz
Common Mode Rejection Ratio >35 dB >25 dB (Typical >30 dB) >25 dB (Typical >35 dB)
Transimpedance Gaina 51 x 103 V/A 103, 104, 105, 106, 107 V/A 30 x 103 V/A
Minimum NEP 6.4 pW/Hz1/2
(DC - 10 MHz)
3.3 pW/Hz1/2
(DC - 10 MHz)
1.3 pW/Hz1/2
(DC - 100 MHz)
0.7 pW/Hz1/2
(DC - 100 MHz)
13.2 pW/Hz1/2
(DC - 100 MHz)
6.0 pW/Hz1/2
(DC - 100 MHz)
Integrated Noise (DC - 100 MHz) 25 nWRMS 14 nWRMS 100 nWRMS 65 nWRMS 290 nWRMS 130 nWRMS
Overall Output Voltage Noise
0.4 mVRMS 0.4 mVRMS 0.5 mVRMS (103 Transimpedance Gain),
0.8 mVRMS (104 Transimpedance Gain),
1.0 mVRMS (10Transimpedance Gain),
1.1 mVRMS (106 Transimpedance Gain),
2.0 mVRMS (10Transimpedance Gain)
2.6 mVRMS 2.3 mVRMS
RF Output
Conversion Gain RF-Outputa,b 27 x 103 V/W 51 x 103 V/W 0.53 x 10V/W,
0.53 x 10V/W,
0.53 x 10V/W,
0.53 x 10V/W,
0.53 x 107 V/W
10V/W,
10V/W,
10V/W,
10V/W,
107 V/W
16 x 103 V/W 30 x 103 V/W
CW Saturation Power RF-Output 130 µW @ 820 nm 70 µW @ 1550 nm 9 mW @ 820 nm 4.5 mW @ 1550 nm 225 µW @ 820 nm 120 µW @ 1550 nm
Impedance 50 Ω
Max Voltage Swing ±1.8 for 50 Ω Load
±3.6 V for High-Impedance Load
±4.6 V (103 to 105 Gain)a
±10 V (107 Gain)a
±1.8 for 50 Ω Load
±3.6 V for High-Impedance Load
DC Offset < ±3 mV
Monitor Outputs
Conversion Gain Monitor Outputs 10 V/mW @ 820 nm 10 V/mW @ 1550 nm 10 V/mW @ 820 nm 10 V/mW @ 1550 nm 10 V/mW @ 820 nm 10 V/mW @ 1550 nm
Impedance 220 Ω
Max Voltage Swing 1.55 V for 50 Ω Load
10 V for High-Impedance Load
Bandwidth DC to 1 MHz
Voltage Noise <180 µVRMS
DC Offset < ±2 mV
General
Fiber Optical Inputsb FC/PC or FC/APC
(Removable)
FC/PC or FC/APC
(Not Removable)
Photodiode Damage Threshold 20 mW
Electrical Outputs SMA (Qty. 3)
Dimensions 85 mm x 80 mm x 30 mm (3.35" x 3.15" x 1.18")
Weight 0.35 kg (without Power Supply)
Operating Temperature Ranged 0 to 40 °C
Storage Temperature Range -40 to 70 °C
Power Supply ±12 V @ 200 mA
  • Value is given for a high-impedance load. For a 50 Ω load, divide the value by 2.
  • Given at detector peak responsivity.
  • For PDB430C FC and PDB460C the FC adapter is NOT removable.
  • Non-condensing.
Item #PDB470CaPDB471CaPDB480C-ACaPDB481C-ACa
Detector
Detector Type InGaAs/PIN
Optical Inputs FC/APC
Internal Coupling Fiber SMF-28e+ HI1060 SMF-28e+ HI1060
Coupling Loss <0.5 dB (<0.3 dB Typ.) <1.0 dB (<0.4 dB Typ.) <0.5 dB (<0.3 dB Typ.) <1.0 dB (<0.4 dB Typ.)
Operating Wavelength Optimized for 1300 nm
(1200 - 1700 nm Range)
Optimized for 1060 nm
(900 - 1400 nm Range)
Optimized for 1300 nm
(1200 - 1700 nm Range)
Optimized for 1060 nm
(900 - 1400 nm Range)
Typical Max Responsivity 0.9 A/W @ 1300 nm 0.72 A/W @ 1060 nm 0.9 A/W @ 1300 nm 0.72 A/W @ 1060 nm
Active Detector Diameter 0.075 mm 0.080 mm 0.075 mm 0.080 mm
Optical Back Reflection <-40 dB
Photodiode Damage Threshold 10 mW 5 mW 10 mW 5 mW
RF OUTPUT
RF OUTPUT Bandwidth (3 dB) DC - 400 MHz 30 kHz - 1.6 GHz 30 kHz - 1.0 GHz
Common Mode Rejection Ratio >25 dB (>30 dB Typ.)
RF OUTPUT Transimedance Gainb 10 x 103 V/A 16 x 103 V/Ac
RF OUTPUT Conversion Gainb 9 x 103 V/W @ 1300 nm 7.2 x 103 V/W @ 1060 nm 14.4 x 103 V/W @ 1300 nmc 11.5 x 103 V/W @ 1060 nmc
RF OUTPUT Power at 1 dB Compressionc - +16.5 dBm Min
+18 dBm Typ.
RF OUTPUT CW Saturation Power 420 µW @ 1300 nm 530 µW @ 1060 nm See Note Below
RF OUTPUT Coupling DC (AC Coupling Available upon Request) AC Coupling Only
RF OUTPUT Impedance 50 Ω
Max Voltage Swing ±1.9 V for 50 Ω Load
±3.8 V for High-Impedance Load
See Note Below
Minimum NEP 8 pW/Hz1/2 (DC to 100 MHz) 9.3 pW/Hz1/2 (30 kHz to 100 MHz) 9.0 pW/Hz1/2 (30 kHz to 100 MHz)
Overal Output Voltage Noise <2.0 mVRMS <9 mVRMS <6.5 mVRMS
MONITOR Outputs
MONITOR Output Impedance 200 Ω
MONITOR Output Bandwidth (3 dB) DC - 3 MHz
MONITOR Output Conversion Gain, High Z Loadb 9 V/mW @ 1300 nm 7.2 V/mW @ 1060 nm 9 V/mW @ 1300 nm 7.2 V/mW @ 1060 nm
MONITOR Output Voltage Swing, High Z Load 10 V Max
Overall Output Voltage Noise <0.65 mVRMS
DC Offset < ±2 mV
General
Electrical Outputs SMA
DC Power Supply ±12 V @ 200 mA
Operating Temperature Ranged 0 °C to 40 °C
Storage Temperature Range -40 °C to 70 °C
Dimensions (W x H x D) 85 mm x 80 mm x 30 mm (3.35" x 3.15" x 1.18")
Weight 0.35 kg
  • All technical data are valid at 23 ± 5 °C and 45 ± 15% relative humidity (non-condensing).
  • Values for transimpedance and conversion gain are lossless gain values [i.e. losses introduced by the FC/APC connectors (typically 0.15 to 0.35 dB) are not considered].
  • For a 50 Ω load.
  • Non-Condensing.

Note:
For the PDB480C-AC and PDB481C-AC, the RF output signal must not exceed the RF Output Power at 1 dB Compression, which is the point at which the amplified signal at 1 GHz is compressed by 1 dB. Above this value, the amplified signal will become non-linear and begin to saturate. The RF output voltage at this saturation point can be calculated using the following formula:

where R is the load impedance (50 Ω), P0 is defined as 1 mW, and L(dBm) is the power level in dBm. Using the specified RF Output Power at 1 dB Compression of 16.5 dBm, this yields the following "maximum" output voltage:

Operation of Balanced Detectors with Bandwidths up to 400 MHz

Thorlabs' Balanced Amplified Photodetectors consist of two well-matched photodiodes and an ultra-low noise, high-speed transimpedance amplifier (TIA) that generates an output voltage (RF OUTPUT) proportional to the difference between the photocurrents in the two photodiodes (i.e., the two optical input signals). Additionally, the unit has two fast monitor outputs (MONITOR+ and MONITOR-) to observe the optical input power levels on each photodiode separately. These outputs are low frequency outputs and cannot be used to measure an RF modulation on the signal. The block diagrams applies to our balanced detectors with Bandwidths up to 400 MHz.

Balanced receiver

Operation of the PDB480C-AC and PDB481C-AC Balanced Detectors

Similar to the balanced detectors described above, the PDB480C-AC and PDB481C-AC Balanced Amplified Photodetectors consist of two well-matched, fiber-coupled photodiodes connected to the inputs with length-matched fibers and an ultra-low noise, ultra-low distortion high-speed transimpedance amplifier (TIA). Similar to the detectors described above, this TIA generates an output voltage (RF OUTPUT) proportional to the difference between the photocurrent in the two photodiodes (i.e. the two optical input signals). Additionally, the unit offers two fast monitor outputs (MONITOR+ and MONITOR-) that allow the user to measure the individual optical input power levels as well as low frequency modulated signals up to 3 MHz.

Balanced receiver

Pin Diagrams for Large-Area Balanced Amplified Photodetectors

Monitor +/-

BNC Female

BNC Female

0 - 10 V Hi-Z (1.5 V for 50 Ω loads)

RF Output

BNC Female

BNC Female

±10 V for Hi-Z (±3 V for 50 Ω loads)

PDB Male (Power Cables)

Pinout for PDA Power Cable

PDB Female (Photodetector)

Pinout for PDA Power Connector

Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
LDS1212 Support Documentation LDS1212:±12 VDC Regulated Linear Power Supply, 6 W, 115/230 VAC
PDB410A Support Documentation PDB410A:Fixed Gain Balanced Amp. Photodetector, 100 MHz, Si
PDB410A-AC Support Documentation PDB410A-AC:Fixed Gain Balanced Amp. Photodetector, 100 MHz, Si, AC Coupled
PDB410C Support Documentation PDB410C:Fixed Gain Balanced Amp. Photodetector, 100 MHz, InGaAs
PDB410C-AC Support Documentation PDB410C-AC:Fixed Gain Balanced Amp. Photodetector, 100 MHz, InGaAs, AC Coupled
PDB420A Support Documentation PDB420A:Fixed Gain Balanced Amp. Photodetector, 75 MHz, Si
PDB420A-AC Support Documentation PDB420A-AC:Fixed Gain Balanced Amp. Photodetector, 75 MHz, Si, AC Coupled
PDB420C Support Documentation PDB420C:Fixed Gain Balanced Amp. Photodetector, 75 MHz, InGaAs
PDB420C-AC Support Documentation PDB420C-AC:Fixed Gain Balanced Amp. Photodetector, 75 MHz, InGaAs, AC Coupled
PDB430A Support Documentation PDB430A:Fixed Gain Balanced Amp. Photodetector, 350 MHz, Si
PDB430A-AC Support Documentation PDB430A-AC:Fixed Gain Balanced Amp. Photodetector, 350 MHz, Si, AC Coupled
PDB430C Support Documentation PDB430C:Fixed Gain Balanced Amp. Photodetector, 350 MHz, InGaAs
PDB430C-AC Support Documentation PDB430C-AC:Fixed Gain Balanced Amp. Photodetector, 350 MHz, InGaAs, AC Coupled
PDB440A Support Documentation PDB440A:Fixed Gain Balanced Amp. Photodetector, 15 MHz, Si
PDB440A-AC Support Documentation PDB440A-AC:Fixed Gain Balanced Amp. Photodetector, 15 MHz, Si, AC Coupled
PDB440C Support Documentation PDB440C:Fixed Gain Balanced Amp. Photodetector, 15 MHz, InGaAs
Part NumberProduct Description
PDB440C-AC Support Documentation PDB440C-AC:Fixed Gain Balanced Amp. Photodetector, 15 MHz, InGaAs, AC Coupled
PDB450A Support Documentation PDB450A:Switchable Gain Balanced Amp. Photodetector, Si
PDB450A-AC Support Documentation PDB450A-AC:Switchable Gain Balanced Amp. Photodetector, Si, AC Coupled
PDB450C Support Documentation PDB450C:Switchable Gain Balanced Amp. Photodetector, InGaAs
PDB450C-AC Support Documentation PDB450C-AC:Switchable Gain Balanced Amp. Photodetector, InGaAs, AC Coupled
PDB460A Support Documentation PDB460A:Fixed Gain Balanced Amp. Photodetector, 200 MHz, Si
PDB460A-AC Support Documentation PDB460A-AC:Fixed Gain Balanced Amp. Photodetector, 200 MHz, Si, AC Coupled
PDB460C Support Documentation PDB460C:Fixed Gain Balanced Amp. Photodetector, 200 MHz, InGaAs
PDB460C-AC Support Documentation PDB460C-AC:Fixed Gain Balanced Amp. Photodetector, 200 MHz, InGaAs, AC Coupled
PDB470C Support Documentation PDB470C:Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs
PDB470C-AC Support Documentation PDB470C-AC:Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs, AC Coupled
PDB471C Support Documentation PDB471C:Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs
PDB471C-AC Support Documentation PDB471C-AC:Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs, AC Coupled
PDB480C-AC Support Documentation PDB480C-AC:Fiber Coupled Balanced Amp. Photodetector, 1.6 GHz, InGaAs, AC Coupled
PDB481C-AC Support Documentation PDB481C-AC:Fiber-Coupled Balanced Amp. Photodetector, 1.0 GHz, InGaAs, AC Coupled

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Posted Comments:
Poster:tschalk
Posted Date:2015-03-03 10:15:39.0
This is a response from Thomas at Thorlabs. Thank you very much for your inquiry. Please note that the measurement of "spectral noise" and "frequency response" is explained in the manual of the PDBs: http://www.thorlabs.de/thorcat/21600/PDB450C-AC-Manual.pdf. You can find the information you are looking for at section 3.6 CMRR and Frequency Response and at section 5 Appendix Typical noise spectra. Unfortunately, it is not possible to flatten the frequency response. I will contact you directly with more detailed information.
Poster:mahldyla
Posted Date:2015-02-27 11:42:57.35
To whom it may concern: Could you explain how the plots of "spectral noise" and "frequency response" are measured for each of the balanced detectors? The reason that I ask is that, with balanced inputs, the output should be shot noise, which is white. I would expect both plots to be identical then, if I am not misunderstanding anything. Also, is there a way to flatten the frequency response of the detector?
Poster:shallwig
Posted Date:2015-01-09 03:40:54.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. You can calculate the rise time of the PDB410A by using the specified 3dB bandwidth and the following formula: f(3dB)=0.35/rise time. This gives you a rise time of 3.5ns. This limitation comes from the built in amplifier. I will contact you directly to discuss your application in detail and to check which PDB meets your requirements best.
Poster:kiwa
Posted Date:2015-01-08 04:02:02.833
What is the rise and fall time of the PDB410A? I want to use it together with Maitai Ti:sapphire oscilator at 42 MHz together with boxcar which will sellect one pulse at 1kHz rate for THz detection via balanced detection. I'm wondering if 100 MHz diodes are fast enough, or shall I go for 350 MHz? It is a free space optics setup so it's better if photodiodes have large area.
Poster:shallwig
Posted Date:2015-01-07 04:59:03.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. We specify the frequency response for various gain settings in the spec sheet of the PDB450A as follows: RF OUTPUT Bandwidth (-3 dB): DC - 150 / 45 / 4 / 0.3 / 0.1 MHz RF OUTPUT Transimpedance Gain: 10^3 / 10^4 / 10^5 / 10^6 / 10^7 V/A So for 10^3 and 10^4 gain settings the 3dB bandwidth is specified with DC-150MHz and DC-45MHz . In the manual http://www.thorlabs.com/thorcat/21600/PDB450A-Manual.pdf on page 31 you can also find a curve showing the frequency versus amplitude for the different gain settings. I will contact you directly to discuss your application in detail and to check if you need further information.
Poster:bpursley
Posted Date:2014-12-29 12:40:43.14
To whom it may concern: Do you have a model (or could suggest one) for the frequency response of the various gain settings on the PDB450A? In particular, the 10^3 and 10^4 gain settings? Thanks in advance!
Poster:bdada
Posted Date:2011-12-29 11:27:00.0
Response from Buki at Thorlabs: To keep everything free-space, I would recommend post mounting two mirrors to an optical table. To minimize space requirements, one of the mirrors can be D shaped. We have sent you a schematic describing the set up. Unfortunately there is not an easy way to mount a lens directly to the balanced detector box. Please contact TechSupport@thorlabs.com if you have any questions.
Poster:boris.povazay
Posted Date:2011-12-27 16:24:59.0
Dear Thorlabs team! You mention that free-space coupling onto the detectors is possible with by dismounting the FC-connectors. However - it is unclear how to couple into that 0.8-0.3mm wide detectors. Especially since they are so close together it is extremely challenging to hit them with a focussed beam. Do you have any suggestions up your sleeve on how to mount pair of lenses with x-y-z positioning capability to the detector box (rather than independently in front of the device)? Many thanks and best regards, Boris
Poster:jvigroux
Posted Date:2011-12-05 09:53:00.0
A response from Julien at Thorlabs: the distance between the photodiode chip and the ferrule of the fiber is between 600µm and 1.1mm. This range is the sum of the mechanical tolerances given by the photodiode manufacturer and ours.
Poster:
Posted Date:2011-11-30 15:31:01.0
A response from Tyler at Thorlabs to Sergey: The diameter of the photodiodes is 0.8 mm. We are looking into the distance between the fiber tip and the photodiode. We will contact you with this information and help you determine an appropriate fiber.
Poster:Sergey.L.Vinogradov
Posted Date:2011-11-29 01:14:37.0
Dear support staff, I try to use PDB450A in Dynamic Light Scattering Spectroscopy at 633 nm with various MM fiber core diameter ranging from 50 to 400 um. Regretfully, I did not find any information on alignment of FC receptacle to photodiode except some general remark: "In general, multi-mode fiber at the input can be used, but in this case the light beam spot diameter exceeds detector’s active area, which results in a reduced output signal as well." Nevertheless, I assume that some large core fiber with low NA could be coupled to photodiode aperture without losses. Please, let me see some mechanical drawing related to that, at least clarifying the distance between receptacle and photodiode. I would also appreciate your advises on appropriate combination of NA and core diameter providing lossless coupling. Thanks in advance, Sergey Vinogradov
Poster:jvigroux
Posted Date:2011-06-06 08:17:00.0
A response from Julien at Thorlabs: Dear Claudius, the bandwidth of the monitor outputs is unfortunately limited by the amplifier that is used for those. An upgrade up to 100MHz or higher is of course technically possible but would imply a large amount of modification and would probably driver the price up substantially. Should you be interested anyways, please contact our technical support at techsupport@thorlabs.com
Poster:weimann
Posted Date:2011-06-03 06:59:44.0
Dear Sir or Madam, Is there the possibility to get a balanced detector with an even faster monitor output? For a current research project a balanced detector with the possbibility to read out a ~100 MHz (or faster) signal from the single PDs would be really helpful. Yours sincerely, Claudius Weimann.
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Switchable Gain with Fast Monitor Output

Specificationsa
Item # PDB450A PDB450C
Detector Type Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.53 A/W 1.0 A/W
Active Detector Diameter 0.8 mm 0.3 mm
Bandwidth (3 dB) DC - 150, 45, 4, 0.3, 0.1 MHz
Common Mode Rejection Ratio >25 dB (Typical >30 dB)
Transimpedance Gainb 103, 104, 105, 106, 107 V/A
Optical Inputs FC/PC or FC/APC (Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ω loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB450A Support Documentation
PDB450ACustomer Inspired!Switchable Gain Balanced Amp. Photodetector, Si
$1,450.00
Today
PDB450A-AC Support Documentation
PDB450A-ACSwitchable Gain Balanced Amp. Photodetector, Si, AC Coupled
$1,450.00
Today
PDB450C Support Documentation
PDB450CSwitchable Gain Balanced Amp. Photodetector, InGaAs
$1,550.00
Today
PDB450C-AC Support Documentation
PDB450C-ACSwitchable Gain Balanced Amp. Photodetector, InGaAs, AC Coupled
$1,550.00
Today

Bandwidth: DC to 15 MHz with Fast Monitor Output

Specificationsa
Item # PDB440A PDB440C
Detector Type Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.53 A/W 1.0 A/W
Active Detector Diameter 0.8 mm 0.3 mm
Bandwidth (3 dB) DC - 15 MHz
Common Mode Rejection Ratio >35 dB
Transimpedance Gainb 51 x 103 V/A
Optical Inputs FC/PC or FC/APC (Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ω loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB440A Support Documentation
PDB440AFixed Gain Balanced Amp. Photodetector, 15 MHz, Si
$1,380.00
Today
PDB440A-AC Support Documentation
PDB440A-ACFixed Gain Balanced Amp. Photodetector, 15 MHz, Si, AC Coupled
$1,380.00
Today
PDB440C Support Documentation
PDB440CFixed Gain Balanced Amp. Photodetector, 15 MHz, InGaAs
$1,460.00
Today
PDB440C-AC Support Documentation
PDB440C-ACFixed Gain Balanced Amp. Photodetector, 15 MHz, InGaAs, AC Coupled
$1,460.00
Today

Bandwidth: DC to 75 MHz with Fast Monitor Output

Specificationsa
Item # PDB420A PDB420C
Detector Type Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.53 A/W 1.0 A/W
Active Detector Diameter 0.8 mm 0.3 mm
Bandwidth (3 dB) DC - 75 MHz
Common Mode Rejection Ratio >35 dB
Transimpedance Gainb 250 x 103 V/A
Optical Inputs FC/PC or FC/APC (Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ω loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB420A Support Documentation
PDB420AFixed Gain Balanced Amp. Photodetector, 75 MHz, Si
$1,270.00
Today
PDB420A-AC Support Documentation
PDB420A-ACFixed Gain Balanced Amp. Photodetector, 75 MHz, Si, AC Coupled
$1,270.00
Today
PDB420C Support Documentation
PDB420CFixed Gain Balanced Amp. Photodetector, 75 MHz, InGaAs
$1,360.00
Today
PDB420C-AC Support Documentation
PDB420C-ACFixed Gain Balanced Amp. Photodetector, 75 MHz, InGaAs, AC Coupled
$1,360.00
Today

Bandwidth: DC to 100 MHz with Fast Monitor Output

Specificationsa
Item # PDB410A PDB410C
Detector Type Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.53 A/W 1.0 A/W
Active Detector Diameter 0.8 mm 0.3 mm
Bandwidth (3 dB) DC - 100 MHz
Common Mode Rejection Ratio >25 dB (Typical >35 dB)
Transimpedance Gainb 50 x 103 V/A
Optical Inputs FC/PC or FC/APC (Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ω loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB410A Support Documentation
PDB410ACustomer Inspired!Fixed Gain Balanced Amp. Photodetector, 100 MHz, Si
$1,140.00
Today
PDB410A-AC Support Documentation
PDB410A-ACFixed Gain Balanced Amp. Photodetector, 100 MHz, Si, AC Coupled
$1,140.00
Today
PDB410C Support Documentation
PDB410CCustomer Inspired!Fixed Gain Balanced Amp. Photodetector, 100 MHz, InGaAs
$1,200.00
Today
PDB410C-AC Support Documentation
PDB410C-ACFixed Gain Balanced Amp. Photodetector, 100 MHz, InGaAs, AC Coupled
$1,200.00
Today

Bandwidth: DC to 200 MHz with Fast Monitor Output

Specificationsa
Item # PDB460A PDB460C
Detector Type Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.50 A/W 1.0 A/W
Active Detector Diameter 0.4 mm 0.15 mm
Bandwidth (3 dB) DC - 200 MHz
Common Mode Rejection Ratio >25 dB (Typical >35 dB)
Transimpedance Gainb 30 x 103 V/A
Optical Inputs FC/PC or FC/APC
(Removable)
FC/PC or FC/APC
(Not Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ω loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB460A Support Documentation
PDB460ACustomer Inspired!Fixed Gain Balanced Amp. Photodetector, 200 MHz, Si
$1,400.00
Today
PDB460A-AC Support Documentation
PDB460A-ACFixed Gain Balanced Amp. Photodetector, 200 MHz, Si, AC Coupled
$1,400.00
Today
PDB460C Support Documentation
PDB460CCustomer Inspired!Fixed Gain Balanced Amp. Photodetector, 200 MHz, InGaAs
$1,380.00
Today
PDB460C-AC Support Documentation
PDB460C-ACFixed Gain Balanced Amp. Photodetector, 200 MHz, InGaAs, AC Coupled
$1,380.00
Today

Bandwidth: DC to 350 MHz with Fast Monitor Output

Specificationsa
Item # PDB430A PDB430C
Detector Type Si/PIN InGaAs/PIN
Wavelength Range 320 - 1000 nm 800 - 1700 nm
Typical Max Responsivity 0.50 A/W 1.0 A/W
Active Detector Diameter 0.4 mm 0.15 mm
Bandwidth (3 dB) DC - 350 MHz
Common Mode Rejection Ratio >20 dB (Typical >25 dB)
Transimpedance Gainb 10 x 103 V/A
Optical Inputs FC/PC or FC/APC
(Removable)
FC/PC or FC/APC
(Not Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ω loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB430A Support Documentation
PDB430AFixed Gain Balanced Amp. Photodetector, 350 MHz, Si
$1,450.00
Today
PDB430A-AC Support Documentation
PDB430A-ACFixed Gain Balanced Amp. Photodetector, 350 MHz, Si, AC Coupled
$1,450.00
3-5 Days
PDB430C Support Documentation
PDB430CFixed Gain Balanced Amp. Photodetector, 350 MHz, InGaAs
$1,550.00
Today
PDB430C-AC Support Documentation
PDB430C-ACFixed Gain Balanced Amp. Photodetector, 350 MHz, InGaAs, AC Coupled
$1,550.00
Today

Bandwidth: DC to 400 MHz with Fast Monitor Output

Responsitivity of the PDB470C-AC and PDB471C-AC Balanced Detectors
Click to Enlarge
The two vertical lines mark 1060 nm (red) and 1300 nm (blue). The shaded regions indicate the specified wavelength range for each detector.
Specificationsa
Item # PDB471C PDB470C
Operating Wavelength Optimized for 1060 nm
(900 - 1400 nm Range)
Optimized for 1300 nm
(1200 - 1700 nm Range)
Detector Type InGaAs/PIN
Internal Coupling Fiber HI1060 SMF-28e+
Typical Max Responsivity 0.72 A/W @ 1060 nm 0.9 A/W @ 1300 nm
Active Detector Diameter 0.080 mm 0.075 mm
Bandwidth (3 dB) DC - 400 MHz
Common Mode Rejection Ratio >25 dB (>30 dB Typ.)
Transimpedance Gainb 10 x 103 V/A
Optical Inputs FC/APC
Monitor Output Bandwidth DC - 3 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Values for transimpedance 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% relative humidity (non-condensing).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB471C Support Documentation
PDB471CFiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs
$1,750.00
Today
PDB471C-AC Support Documentation
PDB471C-ACFiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs, AC Coupled
$1,750.00
Lead Time
PDB470C Support Documentation
PDB470CCustomer Inspired!Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs
$1,650.00
Today
PDB470C-AC Support Documentation
PDB470C-ACCustomer Inspired!Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs, AC Coupled
$1,650.00
Lead Time

Bandwidth: 30 kHz to 1 GHz or Higher with Fast Monitor Output

Responsitivity of the PDB480C-AC and PDB481C-AC Balanced Detectors
Click to Enlarge
The two vertical lines mark 1060 nm (red) and 1300 nm (blue). The shaded regions indicate the specified wavelength range for each detector.
Specificationsa
Item # PDB481C-AC PDB480C-AC
Operating Wavelength Optimized for 1060 nm
(900 - 1400 nm Range)
Optimized for 1300 nm
(1200 - 1700 nm Range)
Detector Type InGaAs/PIN
Internal Coupling Fiber HI1060 SMF-28e+
Typical Max Responsivity 0.72 A/W @ 1060 nm 0.90 A/W @ 1300 nm
Active Detector Diameter 0.080 mm 0.075 mm
Bandwidth (3 dB) 30 kHz - 1.0 GHz 30 kHz - 1.6 GHz
Common Mode Rejection Ratio >25 dB (>30 dB Typ.)
Transimpedance Gainb 16 x 103 V/A
Optical Inputs FC/APC
Monitor Output Bandwidth DC - 3 MHz
  • For a full list of specifications, please see the Specs tab above.
  • For a 50 Ohm load.

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

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDB481C-AC Support Documentation
PDB481C-ACFiber-Coupled Balanced Amp. Photodetector, 1.0 GHz, InGaAs, AC Coupled
$1,750.00
Today
PDB480C-AC Support Documentation
PDB480C-ACFiber Coupled Balanced Amp. Photodetector, 1.6 GHz, InGaAs, AC Coupled
$1,660.00
Today

12 VDC Regulated Power Supply

  • Replacement Power Supply for the Balanced Amplified Photodetectors Sold Above
  • ±12 VDC Power Output
  • Current Limit Enabling Short Circuit and Overload Protection
  • On/Off Switch with LED Indicator
  • Switchable AC Input Voltage (115 or 230 VAC)
  • 6.6 ft (2 m) Cable with LUMBERG RSMV3-657/2M Male Connector
  • UL and CE Compliant

The LDS1212 ±12 VDC Regulated Linear Power Supply is intended as a replacement for the supply included with our PDB line of balanced photodetectors sold on this page. The cord has three pins: one for ground, one for +12 V, and one for -12 V (see diagram above). This power supply ships with a location-specific power cord and the voltage switch is set to the proper setting for your location before it is shipped. This power supply can also be used with our PDA series of amplified photodetectors, our PMM series of photomultiplier modules, our APD series of avalanche photodetectors, and our dichroic atomic vapor spectroscopy systems.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LDS1212 Support Documentation
LDS1212NEW!±12 VDC Regulated Linear Power Supply, 6 W, 115/230 VAC
$77.00
Today
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