The ULN-PDB modules are plug-and-play ultralow noise balanced photodetectors in a compact and user-friendly package. They are proposed with InGaAs, Si, or Extended InGaAs photodiodes and offer a selection of bandwidths and gains in DC- or AC-coupled versions. Moreover, the ULN-PDB-x4 version offers 4 balanced photodetectors in one unit. The ULN-PDB modules offer adaptable optical coupling like free-space, FC/APC, FC/PC (either wide or narrow key) with additional mechanical adaptors.
YOUR ULTRALOW NOISE SYSTEMS.
SILENTSYS develops, produces, and commercializes solutions in photonics, microwave/THz, and electronics. With patented designs and extensive expertise, the products are compact and user-friendly. SILENTSYS targets emerging industrial and lab needs, especially in quantum technologies, metrology, sensing, and communications, offering cutting-edge performance tailored to modern applications.
ULN-PDB: Ultralow Noise Balanced Photodetectors
from €1 190
When every photon matters, trust the detector that captures them clean!
SPECIFICATIONS
| MODEL | ULN-PDB-200 | ULN-PDB-400 | ULN-PDB-800 | ULN-PDB-2200 | ULN-PDB-x4 |
|---|---|---|---|---|---|
| Number of outputs | 1 | 4 | |||
| Spectral range | 200 nm – 1100 nm | 400 nm – 1100 nm | 800 nm – 1700 nm | 800 nm – 2200 nm | Depending on the selected photodiodes |
| Responsivity typ. | 0.4 A/W at 800 nm | 0.55 A/W at 850 nm | 0.9 A/W at 1550 nm | 1.2 A/W at 1850 nm | - |
| Photodiode damage threshold | typ. 5 mW (photodiode dependent) | ||||
| Common-mode rejection ratio (CMRR) | > 60 dB | ||||
| Electrical coupling | DC or AC | ||||
| Trans-impedance gain, Bandwidth, Minimum noise equivalent power (NEP) (example combinations) | 39 kV/A, 100 MHz, 3 pW/√Hz 39 kV/A, 10 MHz, 0.3 pW/√Hz 3.9 kV/A, 100 MHz, 3 pW/√Hz 390 V/A, 500 MHz, 6.5 pW/√Hz | ||||
| Output impedance | 50 Ω | ||||
| Maximum Electrical Bandwidth | 500 MHz (depending on the gain) | ||||
| Output voltage noise | typ. 2.5 nV/√Hz with 390 V/A // typ. 12 nV√Hz with 39 kV/A (noise floor) | ||||
| Output voltage range | -3 V to +3 V | ||||
| Output connectors | SMA female | ||||
| Input connectors | FC/PC or FC/APC (narrow or wide key) or Free space adjustable through mechanical adaptors | ||||
| Product dimensions | 108 x 79 x 33 mm³ | 272 x 108 x 33 mm³ | |||
| Product weight | 300 g | 1.2 kg | |||
| Price | Starting from €1 190 | Starting from €3 750 | |||
| Datasheet |  | | |||
| User guide |  | | |||
PERFORMANCES
FUNCTIONAL DIAGRAM
The functional diagram is a simple view of what the instrument does. It enables a fast and simple understanding of the internal functionalities in respect to the system inputs and outputs.
DRAWINGS
The dimensions of the device are presented here with a simplified view. It also shows the connections from the front and back view of the instrument.
Dimensions are in [mm]
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