GaAs photodiode arrays that support the QSFP standard have been released by Albis Optoelectronics AG. The standard defines an integrated four-channel optical transceiver that provides increased port density when replacing four standard SFP transceiver modules in Ethernet, Fiber Channel and Infiniband applications. The photodiodes provide bandwidth of 5 Gb/s per channel, and each optical aperture has a 100-μm diameter, facilitating optical alignment. Capacitance is 400 fF at bias voltages of 3 V. The chips are designed for wire bonding as well as for flip-chip soldering. Eight- and 12-channel versions also are available.