The dual balanced receiver module QPRV is a small form-factor, optical front-end for DQPSK applications up to 44.6 Gbit/s. It has a bend-insensitive ribbon fi ber optical interface and a co-planar RF interface. The receiver contains four waveguideintegrated pin-photodiodes (PDs) and two linear transimpedance amplifi ers (TIAs) delivering a typical differential output swing of 500 mVpp. The transimpedance of each TIA is manually adjustable to meet linearity specifi cations over a large optical input power range. For both the in-phase and quadrature inputs the receiver offers peak level monitors for convenient feedback to the demodulator phase control circuitry.