A novel technique to reduce crosstalk in monolithically integrated high speed photoreceiver arrays

InP-based monolithically integrated p-i-n/HBT photoreceiver 8- and 16-element arrays with a novel on-chip shielding, to reduce electrical and optical crosstalk, have been fabricated and characterized. The maximum measured bandwidth per channel is 11.5 GHz. A measured adjacent channel crosstalk of -25 dB improves to -40 dB with the shielding at a frequency of 5 GHz and with a dual biasing scheme.