Article Overview
400G NRZ optical modules are available but generally have longer lead times than PAM4 modules due to lower demand and production complexity.
Availability and Market Context
400G optical modules using NRZ signaling are less common than PAM4-based modules, which dominate the market for high-speed 400G deployments . NRZ modules typically use 8×50G lanes or 16×25G lanes, depending on the electrical interface, and are often implemented in QSFP-DD or OSFP form factors . Because NRZ is an older modulation scheme, production volumes are lower, which can extend delivery times compared to PAM4 modules that are widely adopted in hyperscale data centers and telecom networks .
Factors Affecting Delivery Time
- Form Factor and Lane Configuration: QSFP-DD and OSFP modules with 8×50G NRZ lanes are more readily available than 16×25G NRZ modules, which may require specialized gearboxes and DSPs .
- Standardization and Production: NRZ modules follow mature standards (IEEE 802.3bs), but the industry focus has shifted to PAM4 for 400G, meaning NRZ modules may have longer lead times due to lower production priority .
- Supply Chain and Vendor: Lead times vary by manufacturer. Large vendors like Arista, Juniper, and FS.com may offer stock modules for immediate shipment, but custom or high-volume orders can take several weeks to a few months .
Typical Delivery Estimates
- In-stock modules: 1–3 weeks for standard QSFP-DD 400G NRZ modules from major distributors.
- Custom or bulk orders: 6–12 weeks depending on lane configuration, reach (SR4, DR4, LR4), and vendor production schedules .
- Longer-range or specialized modules (e.g., LR4, ER4, ZR4 with NRZ): May require additional DSP or optical engine integration, potentially extending delivery to 3–4 months .
Recommendations
- Confirm form factor and lane configuration with your vendor to ensure compatibility with existing switches or routers.
- Consider PAM4 alternatives if delivery speed is critical, as PAM4 modules are more widely stocked and supported.
- Plan procurement well in advance for NRZ modules, especially for large-scale deployments or long-reach applications. In summary, while 400G NRZ optical modules are available, delivery times are generally longer than PAM4 modules, ranging from a few weeks for in-stock items to several months for specialized or bulk orders, depending on vendor and module specifications .
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