Leading manufacturers of 400G optical modules include InnoLight, Coherent, Eoptolink, Cisco (Acacia), Accelink, Kocent Optec, and Broadcom.

Key Global Manufacturers

• InnoLight Technology (China): A top supplier for hyperscale AI and cloud data centers, specializing in 400G and 800G OSFP/QSFP-DD modules with high-speed PAM4 designs for dense deployments .
• Coherent (USA): Formerly Finisar, Coherent produces a wide range of optical transceivers, including 400G ZR/ZR+ coherent modules, leveraging silicon photonics and integrated optics for telecom and datacom applications .
• Eoptolink Technology (China): Known for agile manufacturing and low-power PAM4 400G transceivers, serving cloud networks and fast deployment scenarios .
• Cisco (Acacia Communications, USA): Focuses on coherent optics for long-haul data center interconnects, offering high-performance 400G modules for enterprise and telecom networks .
• Accelink Technology (China): Provides optical transceivers and components for telecom backbones, 5G fronthaul, and high-speed data center applications .
• Kocent Optec (China): OEM manufacturer offering cost-efficient 400G modules with multi-vendor compatibility (Cisco, Arista, Juniper), emphasizing reliability, thermal management, and rapid R&D iteration .
• Broadcom (USA): Supplies 400G/lane optical DSPs and EML/PD modules, enabling next-generation 1.6T and 3.2T transceivers, optimized for AI infrastructure and high-density data centers .

Considerations for Selection

• Form Factor: QSFP-DD and OSFP are common for 400G modules, while coherent ZR/ZR+ modules are used for metro and long-haul networks .
• Modulation Technology: PAM4 is widely adopted for 400G to double bit rate per lane, while coherent optics support longer distances .
• Compatibility: Many OEMs ensure multi-vendor interoperability, which is critical for large-scale deployments .
• Power and Thermal Efficiency: Leading manufacturers focus on low power consumption and effective thermal management to support dense data center environments . These manufacturers collectively cover hyperscale cloud, telecom, and enterprise networks, providing both standard and custom 400G optical modules to meet evolving bandwidth demands and next-generation network requirements.