Experimental study demonstrates high responsivity and low bit-error rates in an InP/InGaAs photodetector array, highlighting its potential for radio on free-space optical communications.
We propose an integrated back-illuminated InP/InGaAs p-i-n photodetector array (PDA) with high responsivity (R) and external quantum efficiency (EQE). The PDA was characterized and packaged for small-signal response and transmission experiments. At a bias voltage of −5 V, the dark current is below 17.5 μ A/cm 2 , and the average optical responsivity reaches up to 1 A/W for each ∅ =50 μ m element at 1550 nm. The external quantum efficiency is as high as 81% at −5 V at 1550 nm. Under a photocurrent of 63 μ A at −5 V bias, the proposed InP/InGaAs PDA exhibits an average 3 dB bandwidth of 3.6 GHz. We finally demonstrate a BER below 10 −12 at a 2.25 Gbit/s data rate. The compact size and large photosensitive area of the PDA will enable new applications for radio on free-space optical (RoFSO) communications.
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YAN et al. (2025) studied this question.
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