40GBASE-CSR4 QSFP+ Transceiver: 40G-QSFP-300

Our EDGEOPTIC 40G-QSFP-300 is a multi-vendor compatible 40GBASE-CSR4 QSFP+ optical transceiver module engineered for extended-reach 40 Gigabit Ethernet applications over multimode fiber networks. The 40G-QSFP-300 module operates at 850nm wavelength for both transmission and reception across four parallel optical lanes, supporting data rates up to 44.8 Gbps for diverse network protocols and applications. Our 40GBASE-CSR4 QSFP+ transceiver employs VCSEL (Vertical-Cavity Surface-Emitting Laser) technology for transmission and PIN photodiode arrays for receiving, optimized for extended-reach campus and data center interconnects.

The transceiver delivers a 2.5 dB guaranteed optical link budget, enabling extended transmission distance capabilities beyond standard SR4 modules. Over OM4 and OM5 multimode fiber, the module achieves distances up to 300 meters, while OM3 cabling supports approximately 200 meters of reliable connectivity. 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-300 compatible 40GBASE-CSR4 module features hot-pluggable QSFP+ form factor with MTP/MPO-12 UPC connector supporting 8 fibers (4 transmit and 4 receive channels). 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-CSR4 QSFP+ transceiver can be encoded to be compatible and successfully operate in over 80 different brands of networking equipment.

The module incorporates advanced DDM/DOM (Digital Diagnostic Monitoring) functionality providing real-time operational parameters including per-channel transmitted and received optical power levels, module temperature, laser bias current, and supply voltage monitoring. This comprehensive diagnostic data is accessible via MSA-compatible EEPROM interface, enabling proactive performance monitoring and predictive maintenance capabilities. Operating within a standard 0 to 70°C temperature range with single +3.3V power supply, the module ensures stable performance in controlled data center and campus environments.

Standards compliance includes 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 broad multi-vendor interoperability through strict adherence to QSFP+ MSA standards, though equipment with proprietary module verification may require custom EEPROM programming for full compatibility. Our 40G QSFP+ CSR4 transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards.

Primary deployment scenarios include campus backbone connections, data center inter-building links, enterprise aggregation layers, and extended-reach storage area networks. The enhanced optical budget enables longer reaches without requiring single-mode fiber infrastructure, providing cost-effective 40G connectivity for medium-distance applications. Because our focus is delivering superior quality service, we perform comprehensive quality checks before shipment including optical power measurements, connector cleanliness inspection, and QSFP+ transceiver EEPROM memory validation testing.