Low-Noise Large-Area Quad Photoreceivers Based on Low-Capacitance Quad InGaAs Photodiodes

We report a large-area quad photoreceiver (2x2 array) having an equivalent input current noise density of< 3.2 pA/Hz per quadrant up to a 3-dB bandwidth of approximately 20 MHz. The low-noise photoreceiver performance is enabled by a 1-mm diameter quad p-i-n InGaAs photodiode having 2.5-pF capacitance per quadrant at 5-V reverse bias.