40GBASE-ER4 QSFP+ Transceiver: 40G-QSFP-40

Our EDGEOPTIC 40G-QSFP-40 is a multi-vendor compatible 40GBASE-ER4 QSFP+ optical transceiver module engineered for extended-reach 40 Gigabit Ethernet applications over single-mode fiber infrastructure. The 40G-QSFP-40 module utilizes four-channel CWDM technology operating at 1271nm, 1291nm, 1311nm, and 1331nm wavelengths for both transmission and reception, supporting data rates up to 44.8 Gbps across various network protocols and applications. Our 40GBASE-ER4 QSFP+ transceiver employs DFB (Distributed Feedback) laser technology for transmission and APD (Avalanche Photodiode) receivers, specifically optimized for long-haul metropolitan and regional network connectivity.

The transceiver delivers an exceptional 19 dB guaranteed optical link budget, which determines the maximum transmission distance capabilities. Over standard single-mode fiber, the module reliably achieves distances up to 40 kilometers, providing robust connectivity for metropolitan area networks and inter-city connections. However, distance is just an indicative parameter calculated for convenience of identification – ultimately we calculate distance considering minimum optical budget and average attenuation of optical cabling in the industry.

40G-QSFP-40 compatible 40GBASE-ER4 module features hot-pluggable QSFP+ form factor with duplex LC/UPC connectors, significantly simplifying fiber infrastructure deployment compared to parallel optics solutions. The electrical interface conforms to INF-8438i and SFF-8436 MSA (Multi-Source Agreement) specifications, ensuring seamless compatibility with standard QSFP+ host systems across multiple vendor equipment platforms. Our 40GBASE-ER4 QSFP+ transceiver can be encoded to be compatible and successfully operate in over 80 different brands of networking equipment.

The module incorporates sophisticated DDM/DOM (Digital Diagnostic Monitoring) functionality providing real-time monitoring of critical operational parameters including per-channel transmitted and received optical power levels, module temperature, laser bias current, and supply voltage. The APD receiver technology enhances sensitivity for detecting weak optical signals over extended distances. This comprehensive diagnostic information is accessible via MSA-compatible EEPROM interface, enabling proactive network management and performance optimization. Operating within a standard 0 to 70°C temperature range with single +3.3V power supply, the module maintains reliable performance in controlled telecommunications environments.

Standards compliance encompasses IEEE 802.3ba for 40 Gigabit Ethernet, alongside OTU3/OTU3e2 support at 43.01/44.58 Gbps for Optical Transport Networks and STM-256 compatibility for SDH/SONET applications at 39.81 Gbps. The transceiver achieves extensive multi-vendor interoperability through strict adherence to QSFP+ MSA standards, though equipment with proprietary module authentication may require custom EEPROM programming for complete compatibility. Our 40G QSFP-40 transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards.

Primary deployment scenarios include metropolitan area network backbones, inter-data center connectivity, service provider core networks, and long-haul enterprise connections. The 40-kilometer reach with duplex LC connectivity enables cost-effective 40G solutions for extended-distance applications while CWDM technology maximizes fiber utilization efficiency. Because our focus is providing superior quality service, we perform rigorous quality checks before delivery including optical power validation, APD receiver sensitivity testing, connector cleanliness verification, and QSFP+ transceiver EEPROM memory data validation.