Si free-space balanced photodetector

PDX10B-SI - Si free-space balanced photodetector
PDX10B-SI - Si free-space balanced photodetector PDX10B-SI - Frequency response PDX10B-SI - Shot noise PDX10B-SI - Noise Equivalent Power

Koheron PDX10B-SI is a Si free-space balanced photodetector with 80 kV/A transimpedance gain and 8 MHz bandwidth. With a noise-equivalent power spectral density of only 1 pW/√Hz at 800 nm and the capability to reject laser common mode noise, the photodetector can be shot-noise limited even at a low input signal level. A monitoring input signal is provided for each photodiode to assist with beam alignment and power balancing.

Quantity Price



Detector type Si PIN photodiode Si PIN photodiode
Active diameter 800 µm 800 µm
Wavelength range 320 nm to 1000 nm 320 nm to 1000 nm
Optical input power 0 mW to 3 mW 0 mW to 3 mW
Photodiode peak responsivity (800 nm) 0.55 A/W 0.55 A/W
Transimpedance amplifier
Small signal bandwidth 0 Hz to 8 MHz at 3 dB 0 Hz to 50 MHz at 3 dB
Coupling DC DC
Transimpedance gain 80 kV/A 3 kV/A
Noise Equivalent Power 1.4 pW/√Hz (at 1 MHz) 6 pW/√Hz (at 1 MHz)
Output voltage range (high impedance) -8.0 V to 8.0 V -8.0 V to 8.0 V
Output voltage range (50 Ω) -3.8 V to 3.8 V -3.8 V to 3.8 V
Output impedance 50 Ω 50 Ω
Output SMA female connector SMA female connector
Monitoring (MON+ / MON-)
Gain 1 V/mA 1 V/mA
Bandwidth 4 kHz 4 kHz
Output impedance 1 kΩ 1 kΩ
Power supplies
Positive supply voltage 5.5 V to 9 V (nominal 6 V) 5.5 V to 9 V (nominal 6 V)
Negative supply voltage -9 V to -5.5 V (nominal -6 V) -9 V to -5.5 V (nominal -6 V)
Quiescent current 35 mA per rail 35 mA per rail
Maximum current 100 mA per rail 100 mA per rail
Outside dimensions 49 mm x 40 mm x 18 mm 49 mm x 40 mm x 18 mm
Operating temperature 0 °C to 50 °C 0 °C to 50 °C
Weight 29 g 29 g

More Photodetectors

Functional diagram

PDX10B-80-DC-SI free-space Si balanced photodetector functional diagram


Output power spectral density

The power spectral density of the PDX10B-80-DC-SI free-space balanced photodetector output was measured for different incident optical powers. Optical source is a pair of 810 nm LEDs driven by a Koheron DRV110-A-375 laser driver. Power spectrum is measured using the Koheron ALPHA250 FFT analyzer.

PDX10B Output power spectral density 80 kV/A version
PDX10B-80-DC-SI output power spectral density
PDX10B Output power spectral density 3 kV/A version
PDX10B-3-DC-SI output power spectral density

Small signal frequency response

PDC10B-80-DC-SI photodetector frequency response
PDC10B-80-DC-SI frequency response
PDX10B-3-DC-SI photodetector frequency response
PDX10B-3-DC-SI frequency response

Noise equivalent power

The figure below shows the noise-equivalent power spectral density at a wavelength of 810 nm.

PDX10B-80-DC-SI photodetector noise equivalent power
PDX10B-80-DC-SI noise equivalent power
PDX10B-3-DC-SI photodetector noise equivalent power
PDX10B-3-DC-SI noise equivalent power

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Export information

HS code 8541.40.90
Country of Origin France

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