The integrated DPSK receiver module IDRV consists of a balanced photoreceiver and an integrated delay-line interferometer (DLI). The IDRV is a differential front-end for 43 Gbit/s DPSK-applications featuring high differential gain of typically 1500 V/W. The two output ports of a phase-tunable DLI are coupled into two single chip waveguide-integrated pin-photodiodes (PD). Signal gain is obtained using a differential amplifier with limiting output stage. The limiting amplifier produces a typical differential output voltage swing of 550 mV. The receiver is therefore well suited for phase modulated OC-768/STM-256 system operation.