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Dual logarithmic photodetector

PRODUCTS > PHOTONICS > PHOTODETECTORS > DUAL LOGARITHMIC PHOTODETECTOR
PD10R Dual logarithmic photodetector
PD10R Dual logarithmic photodetector PD10R Dual logarithmic photodetector output voltage vs optical power PD10R Dual logarithmic photodetector frequency response PD10R Dual logarithmic photodetector gas cell absorption PD10R Dual logarithmic photodetector absorption measurement setup PD10R Dual logarithmic photodetector mechanical drawing

Koheron PD10R is a dual logarithmic photodetector for general purpose optical power measurements. In addition to two analog outputs log(A) and log(B), the PD10R gives the log-ratio log(A/B) with an adjustable offset and two gain settings (x1 and x10). The PD10R provides a fully-analog solution for direct absorption measurement in spectroscopy setups.
For free-space measurements, see Koheron PDX10R free-space logarithmic photodetector.

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Specifications

PD10R
Detector
Detector type Dual InGaAs photodiodes
Active diameter 300 µm
Wavelength range 900 nm to 1700 nm
Optical input power(0 dBm = 1 mW) -67 dBm to 7 dBm
Peak responsivity(1550 nm) 0.9 A/W
Photodiode connector FC
Logarithmic amplifier
Small signal bandwidth(at 3 dB, input current > 100 µA) 1.2 MHz
Logarithmic slope 300 mV/decade
Intercept photocurrent 100 pA
Output impedance 1 kΩ
Power supplies
Supply voltage 3.3 V to 13 V
Quiescent current 11 mA
Maximum current 40 mA
Other
Outside dimensions 38 mm x 53 mm x 12 mm
Operating temperature 0 °C to 50 °C
Weight 24 g

More Photodetectors

Characterization

Output voltage vs Optical power

Optical source is a Koheron LD101 1550 nm DFB laser followed by a variable optical attenuator and measured with a Thorlabs PM100D / S155C power meter.

PD10R Dual logarithmic photodetector output voltage vs optical power
PD10R output voltage vs optical power

We observe a linear behavior between -50 dBm (10 nW) and 7 dBm (5 mW).

Frequency response

Frequency response of the logarithmic amplifier for several input optical powers:

PD10R Dual logarithmic photodetector frequency response
PD10R frequency response

Absorption measurement

The PD10R can perform accurate absorption measurements with small amounts of optical power. We used the setup below to observe the absorption lines of a HCN gas cell with 200 nW of total optical power. Optical source is a DFB laser whose temperature is increased linearly from 10 to 25 °C in 60 s. The absorption path and the reference path are connected respectively to the A and B inputs of the PD10R.

PD10R Dual logarithmic photodetector absorption measurement setup
PD10R absorption measurement setup

The three outputs log(A), log(B) and log(A/B) have been recorded simultaneously during the 60 s temperature sweep. Intensity variation observed on the log(A) and log(B) channels are nicely rejected on the log(A/B) output. Numerical computation of log(A/B) from log(A) and log(B) is represented in the cyan curve.

PD10R Dual logarithmic photodetector gas cell absorption
PD10R gas cell absorption

Complementary products

Dual power supply New options

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Ordering codes

PRODUCT NUMBER ATTRIBUTE
PD10R InGaAs photodiodes mounted
PD10R-NOP No photodiodes

Export information

PRODUCT NUMBER COUNTRY OF ORIGIN HS CODE HTSUS ECCN
PD10R France 85414900 8541499500 EAR99
PD10R-NOP France 85423990 8542390001

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