Compact 100G Coherent Receiver Using InP-based 90° Hybrid Integrated with Photodiodes

A compact 100G coherent receiver using InP-based 90° hybrid integrated with photodiodes is reported. The package body size, at 13.6 × 25.2 × 5.5 mm, is the smallest ever reported. The device demonstrates bandwidth of 24 GHz and responsivity of 64 mA/W at 1550 nm. 128 Gbit/s DP-QPSK transmission tests have been successfully conducted.