400G optical module with high temperature resistance

400G high-temperature resistant optical modules are advanced transceivers designed for high-speed, high-bandwidth data transmission in demanding environments, supporting QSFP-DD or OSFP form factors with PAM4 or coherent modulation.OverviewA 400G optical module converts electrical signals into optical signals for transmission over fiber and back into electrical signals at the receiver, enabling ultra-high-speed data transfer up to 400Gb/s . These modules are critical for modern data centers, cloud computing, and enterprise networks, especially where high-density and high-performance connections are required.Key FeaturesForm Factors: QSFP-DD (Quad Small Form Factor Pluggable Double Density) and OSFP (Octal Small Form Factor Pluggable) are the most common 400G module form factors . QSFP-DD supports backward compatibility with QSFP28, while OSFP provides slightly larger dimensions for higher thermal dissipation.Modulation Techniques: PAM4 (4-Level Pulse Amplitude Modulation) is widely used for short-reach modules like SR4 and SR4.2, while coherent DP-16QAM modulation is used in long-reach modules like 400ZR for single-wavelength 400G transmission .Transmission Distance: Short-reach SR4 modules typically support 70–100 meters on OM3 fiber and up to 150 meters on OM4 fiber . Long-reach LR4/ER4 modules can achieve 10–30 km, and 400ZR modules can reach up to 120 km over single-mode fiber .Fiber Type: Multimode fiber (MMF) is used for short-reach modules, while single-mode fiber (SMF) is used for long-reach and DWDM applications .High-Temperature Resistance: Modules designed for high-temperature environments feature enhanced thermal management, including heat sinks and optimized PCB layouts, allowing stable operation in elevated ambient temperatures typical of industrial or high-density data center deployments.ApplicationsData Center Interconnects (DCI): High-performance 400G modules like 400ZR and ZR+ support long-distance, high-bandwidth connections between data centers without external line systems .Cloud and Enterprise Networks: SR4.2 modules provide high-density, short-to-medium distance connections within large-scale data centers, supporting 400G bandwidth with improved transmission quality .Metro and Long-Haul Networks: LR4/ER4 and QSFP-DD ZR+ modules enable cost-effective 400G transmission over tens to hundreds of kilometers, suitable for metro IP and DWDM applications .SummaryOriginal 400G high-temperature resistant optical modules combine high-speed 400G transmission, robust thermal design, and flexible form factors (QSFP-DD or OSFP) to meet the demands of modern high-density networks. They support both short-reach multimode and long-reach single-mode applications, using PAM4 or coherent modulation, making them ideal for data centers, cloud computing, and long-haul optical networks .