Description

Farsince 400G QSFP‑DD LR4 is a hot‑pluggable optical transceiver designed for long‑reach 400‑Gigabit Ethernet on single‑mode fiber. The module converts eight electrical lanes in the QSFP‑DD host to four optical lanes using 100G PAM4 and CWDM wavelengths (1271/1291/1311/1331 nm). It presents a duplex LC/UPC interface and supports reaches up to 10 km on G.652 SMF. Typical deployments include data‑center spine/leaf interconnects, aggregation to core routers, campus distribution links and short‑haul DCI where 400G over LC patching is required.

An EML transmitter and PIN receiver architecture provides stable operation with KP4 FEC on the host, while digital diagnostics through CMIS enable real‑time monitoring for operations and maintenance. The compact QSFP‑DD form factor supports high‑density panels and hot‑swap serviceability. Interoperability with the 100G Lambda MSA 400G LR4‑10 specification and QSFP‑DD MSA ensures smooth integration across major platforms. Farsince offers OEM‑specific coding, project labeling, acceptance testing and coordinated supply to support rollout and lifecycle spares.

Specifications

• Product Type: 400G QSFP‑DD LR4 optical transceiver
• Host Interface: QSFP‑DD MSA, CMIS management
• Device Interface: Duplex LC/UPC
• Data Rate: 4 × 106.25G PAM4 (400G aggregate)
• Wavelengths: CWDM 1271/1291/1311/1331 nm
• Fiber Type: Single‑mode (G.652)
• Reach: Up to 10 km
• Optical Engine: EML transmitters / PIN receivers
• Digital Diagnostics: DOM/DDM via I2C (CMIS)
• Host FEC: KP4 FEC required
• Operating Temperature: 0°C to +70°C case
• Applications: Spine‑leaf, aggregation/core, campus links, DCI ≤10 km
• Compatibility: 100G Lambda MSA 400G LR4‑10; CAUI‑8 electrical; QSFP‑DD MSA
• Power Design: Power class up to ~10 W
• Compliance: RoHS, REACH
• Customization: Vendor coding, labeling and test reports available