Top manufacturers of integrated optical receiver modules (IORMs) include major players like Broadcom, Coherent (Finisar), Lumentum, Sumitomo Electric, and Innolight, serving telecom, data center, and CATV markets with high-speed, compact modules for 100G/400G+ applications, while specialized suppliers like Sanland and YB Photonics offer modules for PON and specific optical sensing needs, all focusing on integrating photodiodes, transimpedance amplifiers (TIAs), and other components for efficient optical-to-electronic conversion. 

To find a manufacturer, consider your specific needs (speed, range, application) and look into these key companies for high-volume or specialized solutions.