40km Long Reach PAM4 50G QSFP28 Single Mode Optical Transceiver for 5G Fronthaul

The QSFP28 50G optical transceiver is a single-lambda PAM4 module engineered for 40km transmission over standard single-mode fiber at a 1311nm wavelength. By pairing an electro-absorption modulated laser (EML) transmitter with an avalanche photodiode (APD) receiver, this QSFP28 50G optical transceiver keeps a clean 50 Gbps signal across metro and long-haul spans where conventional duplex 25G NRZ modules simply cannot reach.

Built to the 50GBASE-ER, QSFP28 MSA and SFF-8636 specifications, every unit supports I2C digital diagnostics, hot-swappable installation and a single 3.3V supply. The 1311nm single-mode design maximizes link budget and keeps chromatic dispersion low over the full 40km span, which is why this QSFP28 50G optical transceiver is widely deployed in 5G fronthaul, data center interconnect and telecom backhaul networks.

Technical Specifications

Typical Application Areas

• 5G fronthaul and mid-haul links between distributed and centralized units
• Long-reach data center interconnect (DCI) up to 40km
• Metro Ethernet rings and telecom backhaul
• 50G aggregation in service provider transport networks
• Enterprise campus and metropolitan area network extension

Key Advantages

• 40km long-reach single-mode transmission on a single fiber pair
• PAM4 modulation doubles the throughput of a single laser lane
• 1311nm low-dispersion wavelength for stable long spans
• Hot-swappable QSFP28 form factor with real-time digital diagnostics
• Under 5W power draw for dense, high-port-count chassis

Quality, Compliance & Compatibility

Manufacturing follows a controlled flow from wafer-level laser screening to module assembly in a Class 10000 clean room. Every 1311nm laser is characterized for wavelength stability, side-mode suppression and output power before mounting, and each QSFP28 50G optical transceiver is then burned in and re-tested for PAM4 eye quality and receiver sensitivity. Finished units meet RoHS, CE and FCC requirements and can be supplied with TAA-compliant BOMs on request. Performance is verified against the 50GBASE-ER optical mask across the full operating temperature range, so the module holds its margin in real field conditions rather than only on the bench.

Interoperability is validated against major switch and router platforms, including common 50G Ethernet line cards and 5G transport appliances. We provide EEPROM pre-configuration and coding so the module is recognized correctly on first insertion, and our engineers assist with host-compatibility testing before volume orders. For 40km long-reach spans we also supply matched patch cords, attenuation guidance and link-budget calculations to help you plan 5G fronthaul and data center interconnect links with confidence.

Each order ships in ESD-safe, shock-resistant packaging with individual serial labels and test reports. Modules carry a multi-year warranty, and our support team offers RMA handling, firmware guidance and long-term supply continuity for both pilot builds and mass production.

Frequently Asked Questions

Each QSFP28 50G optical transceiver passes 100% end-of-line testing, including eye-mask, sensitivity and 40km system BER verification before shipment, and ships with a multi-year warranty and full OEM labeling support. Our optical engineering team provides compatibility checks, firmware guidance and long-term supply continuity, so your 5G fronthaul and 40km long-reach links stay online with confidence.