Cisco QSFP-400G-ZR-S 400G Coherent DWDM Transceiver

The Cisco QSFP-400G-ZR-S is a 400G coherent DWDM transceiver designed for long-reach data center interconnect (DCI) and carrier Ethernet applications. It implements coherent DSP technology to enable transmission over extended distances on a single wavelength, eliminating the need for inline optical amplification in many deployment scenarios.

This transceiver operates across the C-band DWDM spectrum with integrated tunable laser capability, supporting flexible grid wavelength assignment. The ZR-S variant is optimized for cost-effective long-haul connectivity while maintaining the coherent signal processing required for 400G line-rate performance.

The module interfaces via standard QSFP-DD form factor, enabling integration into existing modular optics platforms. Supply constraints driven by limited DWDM DSP chip availability have characterized the market since its 2022 launch, with constraints expected to persist through 2025–2026.

Ideal for

• Long-distance DCI connectivity between regional data centers without intermediate optical amplification
• Carrier-grade Ethernet backbone links requiring 400G coherent signal integrity over 80+ km spans
• Flexible DWDM grid deployment in existing dark fiber infrastructure with wavelength reuse
• Submarine and terrestrial long-haul network expansion with integrated coherent processing
• Multi-tenant cloud exchange environments requiring tunable per-wavelength 400G capacity
• Enterprise campus interconnect over extended metropolitan fiber runs

Technical specifications

Available from Omnixon Global. Submit an RFQ and our team will confirm configuration and availability for your order.