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Performance Analysis of an InGaAs Based p-i-n Photodetector

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Author(s): Diponkar Kundu | Dilip Kumar Sarker | Md. Galib Hasan | Pallab Kanti Podder | Md. Masudur Rahman

Journal: International Journal of Soft Computing & Engineering
ISSN 2231-2307

Volume: 2;
Issue: 1;
Start page: 316;
Date: 2012;
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Keywords: p-i-n photodetector | quantum efficiency | photocurrent density | normalized frequency response.

ABSTRACT
an InGaAs based p-i-n photodetector model ischosen in order to find out quantum efficiency, photocurrentdensity, and normalized frequency response with and without RCeffect. Normalized frequency response is the most importantfactor in order to analysis the performance of p-i-n photodetector.Quantum efficiency, photocurrent density, normalized frequencyresponse curves are obtained by formulation which is done fromstructure and MATLAB simulation. A relation for thefiber-to-waveguide coupling efficiency has also been used tocalculate the overall quantum-efficiency of waveguidephotodetector [1]. Normalized frequency response is obtained byvarying value of frequency dependent transfer function ofequivalent circuit model of p-i-n photodetector with frequency.For enhancing bandwidth of photodetector, the parametric valuesof photodetector such as reverse bias junction capacitance andresistance, has been optimized. The effect of carrier trapping at aheterointerface has also been considered to study the frequencydependence of the photocurrent at low-bias voltages [1].
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