Monolithically integrated four-channel receiver array using diffused InGaAs JFET technology

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Abstract
Four-channel receiver arrays have been fabricated by monolithically integrating diffused InGaAs JFET-based electronics with InGaAs pin photodiodes. Cascode and simple inverter transimpedance amplifier circuits have been produced, both of which use a micro-FET as a tunable feedback element to vary bandwidth between 20 and 800 MHz. A sensitivity of –28.2dBm was achieved at 1.25Gbit/s with crosstalk between adjacent channels of –50dB (electrical).