InGaAlAs/InP Integrated Optical Receiver Based on Inverse Design for Fabrication-Friendly and Low Loss

We demonstrate a fabrication-friendly, low-loss monolithic InGaAlAs/InP optical receiver featuring an inverse-designed wavelength division multiplexer (WDM) and unitraveling carrier photodiodes (UTC-PDs). Topology-optimized WDM achieves simulated insertion loss <1 dB and crosstalk < −20 dB over the C-band. The UTC-PDs exhibit a 3-dB bandwidth of >130 GHz and a responsivity of 0.56 A/W at 1550 nm, enabled by drift-dominated carrier transport. This co-design strategy bridges ultra-compact WDM and high-speed detection for scalable photonic integration.