APD receivers achieve low noise without a TE cooler

Posted By : Nat Bowers
APD receivers achieve low noise without a TE cooler

In order to reduce the overall noise of the detector/amplifier module, the capacitance connected to the amplifier has to be as small as possible. LASER COMPONENTS' H0 series of avalanche photodiode (APD) receivers make the connections as short as possible to make the parasitic capacitance as exceptionally low as the junction capacitance of the company's low-noise Silicon and InGaAs APDs (SARP-Series and IAG-Series).

The simplest way to use a detector is with a receiver circuit, where quality is judged according to the amount of noise produced. The company's Silicon and InGaAs APDs offer the optimal pre-requisites for detectors. But for the entire system, amplifier noise is the dominant source of noise.

When developing the H0 series of APD receivers, LASER COMPONENTS aim was to achieve low noise performance with high responsivity without the need for a thermoelectric (TE) cooler (with only a thermistor required for stability). Ideally, the inherent noise of the receivers should be zero. Although not physically possible, the company's developers came very close to meeting this goal.

Thanks to the compact, modified TO-5 housing with an approximate diameter of 5mm, the H0 series APD receivers can be integrated into small systems which measure distances or detect the smallest light signals.

If integrated with the company's SAR500 Si APD with a diameter of 500µm, the module has a noise equivalent power of just 4.86fW/√Hz at an amplification of 3x106V/W without requiring an expensive and power hungry TE cooler. If the receiver is intergrated with LASER COMPONENTS' IAG series 80µm or 200µm InGaAs APD, the module can achieve a noise equivalent power of 0.47pW/√Hz at an amplification of 1.1x106V/W.

Downloads


You must be logged in to comment

Write a comment

No comments




Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

RF & Microwave 2019
20th March 2019
France Paris Expo, Porte de Versailles
ADAS Sensors 2019
20th March 2019
United States of America Detroit, Michigan
Anti-Counterfeiting Forum 2019
20th March 2019
United Kingdom Farnborough, Hampshire
Hannover Fair 2019
1st April 2019
Germany Hannover
The Security Event 2019
9th April 2019
United Kingdom NEC, Birmingham