04 Feb 2014 The simplest way to use a detector is with a receiver circuit. Here the quality is judged according to the amount of noise produced. Our extremely low-noise Silicon and InGaAs APDs (SARP-Series and IAG-Series) offer the optimal pre-requisites for detectors. For the entire system, however, the amplifier noise is the dominant source of noise.
To reduce the overall noise of the detector/amplifier module, the capacitance connected to the amplifier has to be as small as possible. This is achieved by making the connections as short as possible to minimise the parasitic capacitance together as the exceptionally low junction capacitance of our APDs.
H0 series: In our H0 series of APD receivers, the goal was to achieve low noise performance with high responsivity without the need for a TE cooler; only a thermistor would be required for stability. The inherent noise of the receivers should be zero. Although this is physically not possible, our developers came very close to meeting this goal.
Depending on the integrated feedback resistor, a bandwidth from DC up to 80MHz can be achieved. If the SAR500, our Si APD with a diameter of 500µm, is integrated, the module has a noise equivalent power (NEP) of only 4.86fW/√Hz at an amplification of 3 x 106V/W without the need for an expensive and power hungry TE cooler. With the 80µm or 200µm InGaAs APD of the IAG series, the following values can be achieved: 1.1 x 106V/W @ 0.47pW/√Hz.
Due to the very compact, modified TO-5 housing with a diameter of approximately 5mm, the H0 series APD receivers can be integrated into small systems with which, for example, distances can be measured or the smallest light signals detected.
For more information visit our website at
http://www.lasercomponents.com/uk/product/apd-receivers/
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