Athermal InP-based 90°-hybrid Rx OEICs with pin-PDs >60 GHz for coherent DP-QPSK photoreceivers

An InP-based 90° hybrid OEIC with integrated pin-photodiodes is presented. It operates unaffected in the temperature range of 15°–35° C, offering low PDL <1 dB, and stable performance in the wavelengths of 1530 nm to 1565 nm.