Cisco 400G QSFP-DD High-Power (Bright) Optical module's small size and low power make it an optimal choice for a wide range of DCI/Cloud, metro access/aggregation, wireless backhaul, and campus interconnect applications. 400G Optical Module by Application (Data Communication, Telecom, Other), by Types (Less Than 1 km, 1 km, 2 km, 10 km, Others), by North America (United States, Canada, Mexico), by South America (Brazil, Argentina, Rest of South America), by Europe (United Kingdom, Germany, France, Italy, Spain. The 400G DR4 optical module is a high-speed optical transceiver module compliant with the IEEE 802. 3bs standard, designed specifically for medium-to-short distance transmission in 400G Ethernet. It adopts the QSFP-DD form factor, operates in the 1310nm wavelength band, and uses MPO-12 single-mode. Cisco is now expanding the range of 400G Digital Coherent QSFP-DD transceivers, introducing High Tx Power variants (+1dBm of Tx Power). Thanks to the miniaturization of the technology with a 7-nm manufacturing procedure and innovation in silicon photonic technology, it is now possible to also. From cloud data centers to metro and long-haul networks, 400G—particularly coherent variants like ZR and ZR+—is helping eliminate bandwidth bottlenecks and support the growing demands of AI, big data, and next-generation digital services. With a transmission rate of up to 400 Gbps, 400G transceivers offer double the capacity of their predecessor (200G transceivers). 400G. The global 400G Optical Module market size is predicted to grow from US$ 1105 million in 2025 to US$ 2057 million in 2032; it is expected to grow at a CAGR of 8.