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Dual logarithmic photodetector

PRODUCTS > PHOTONICS > PHOTODETECTORS > DUAL LOGARITHMIC PHOTODETECTOR
PD10R - Dual logarithmic photodetector
PD10R - Dual logarithmic photodetector Output voltage vs Optical Power Frequency response Measurement of gas cell absorption Setup for measurement of gas cell absorption PD10R 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 PIN photodiodes
Active diameter 300 µm
Wavelength range 900 nm to 1700 nm
Optical input power -67 dBm to 7 dBm (0 dBm = 1 mW)
Peak responsivity (1550 nm) 0.90 A/W
Photodiode connector FC
Logarithmic amplifier
Small signal bandwidth 1.2 MHz at 3 dB (for input current > 100 µA)
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
Max. current 40 mA
Other
Outside dimensions 38 mm x 53 mm x 12 mm
Operating temperature 0 °C to 50 °C

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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.

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 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.

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.

Gas cell absorption

Complementary products

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Ordering codes

REFERENCE ATTRIBUTE
PD10R InGaAs photodiodes mounted
PD10R-NOP No photodiodes

Export information

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

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