CQP-85400G-SR4 400Gbps QSFP-DD Optical Transceiver with 850nm VCSEL Array and Hot-Swappable Design for Data Centers

The CQP-85400G-SR4 is a high-performance enterprise-grade 400G QSFP-DD SR4 optical transceiver specifically designed for short-range high-bandwidth connectivity in modern data centers. It adopts advanced PAM4 modulation technology and 850nm VCSEL array to deliver stable and efficient data transmission over multi-mode fiber. With a compact QSFP-DD form factor, it maximizes port density for space-constrained data center environments, supporting hot-swappable design and digital optical monitoring (DOM) for easy maintenance and real-time performance tracking.

The CQP-85400G-SR4 is a cutting-edge 400G optical transceiver engineered to meet the ever-growing bandwidth demands of modern data centers, AI clusters, and high-performance computing (HPC) environments. It combines high-speed transmission, low latency, and high reliability to deliver a superior connectivity solution for intra-data center short-range links.

Designed with advanced PAM4 modulation technology, this transceiver achieves 400Gbps aggregate data rate through 4 parallel 106.25Gbps lanes, significantly increasing data throughput compared to traditional 100G or 200G modules. The 850nm VCSEL array technology ensures cost-effective short-range transmission, making it the optimal choice for intra-rack, row-to-row, and short-distance inter-cabinet connections in data centers.

The compact QSFP-DD double-density form factor allows for higher port density on network switches, reducing the physical space required in data centers and lowering deployment costs. The hot-swappable design enables easy installation and replacement without disrupting network operations, minimizing downtime and improving maintenance efficiency.

Equipped with built-in DOM (digital optical monitoring), the CQP-85400G-SR4 provides real-time monitoring of key performance metrics including module temperature, supply voltage, laser bias current, transmit power, and receive power. This allows network administrators to proactively monitor module health, detect potential issues early, and ensure stable network operation.

This transceiver is fully compliant with IEEE 802.3bs, QSFP-DD MSA, and CMIS 4.0 standards, ensuring seamless integration with mainstream network equipment from leading manufacturers. It also supports 4x100G-SR breakout mode, providing flexible compatibility with legacy 100G networks and enabling smooth network migration and upgrade.

• Ultra High Bandwidth: 400Gbps aggregate data rate with 4×106.25Gbps per lane PAM4 modulation delivers exceptional throughput to support next-generation data center workloads
• Optimized Short Range Transmission: 850nm VCSEL technology enables 100m transmission over OM4 MMF, 60m over OM3 MMF, and 30m over OM2 MMF
• Cost Effective Solution: Mature 850nm VCSEL technology and multi-mode fiber reduce deployment costs compared to single-mode solutions
• High Port Density: QSFP-DD double-density form factor maximizes port density on network switches
• Superior Compatibility: Fully compliant with industry standards and supports 4x100G-SR breakout mode
• Low Latency & Low Power: Optimized DSP design minimizes transmission latency while energy-efficient design reduces power consumption
• Easy Maintenance: Hot-swappable design supports online replacement and built-in DOM provides real-time performance monitoring
• Environmental Compliance: RoHS 2.0 compliant and Class 1 eye-safe laser design meets global standards