Coherent releases high-speed InP photodiodes for 1.6T transceivers

Coherent (COHR) has announced the production release of high-speed indium phosphide InP photodiodes. Designed for use in the next generation of 800G and 1.6T transceivers with 200 Gb/s PAM4 optical lanes, and available in both singlet and 1×4 array configurations with integrated lenses, they provide efficient optical coupling and compatibility with all major 4-channel and 8-channel transimpedance amplifiers TIA . Featuring a wide optical response from 900 nm to 1650 nm and high responsivity at 1310 nm, these RoHS-compliant devices have a 3 dB bandwidth greater than 50 GHz, a low capacitance of 50 femtofarads fF , and low dark current. The photodiode arrays are available in two different flip-chip pad configurations for compatibility with high-performance TIAs and are engineered to meet the demanding requirements of longwave fiber-optic communication systems. “These photodiodes represent a major advancement in reliability and performance for data center applications,” said Kou-Wei Wang, Vice President, InP DML & Photodiodes at Coherent. “Their high bandwidth and excellent optical characteristics allow our customers to develop high-speed optical transceivers with an additional performance margin.” These high-speed photodiodes are currently available in sample quantities, with general availability planned for Q1 2025.