Goxs-bi5303-20d And Goxs-bi3503-20d Sfp-bidi Transceivers – High-performance optical transceiver module providing hot-pluggable connectivity for fiber optic networks. This small form-factor pluggable (SFP) module delivers multi-gigabit data transmission speeds (1.25 Gbps to 2.5 Gbps) over single-mode fiber with reach capabilities up to 80km. BiDirectional (BiDi) WDM technology enables simultaneous transmit and receive operations on a single fiber strand using wavelength division multiplexing (1490nm/1550nm or 1310nm/1550nm), effectively doubling network capacity without requiring additional fiber installation. Features include hot-swappable form factor, LC optical connectors, built-in digital diagnostic monitoring (DDM), automatic power control, temperature-compensated laser drivers, and wide dynamic range photodiode receivers. Industrial-grade construction with full metal enclosure provides excellent EMI and ESD protection. Compliant with MSA specifications and industry standards including IEEE 802.3z, IEEE 802.3ae, ITU-T G.695, and Bellcore TA-NWT-000983. Eye-safe laser design meets IEC60825-1 classification. Suitable for Gigabit Ethernet, Fiber Channel, SDH, SONET, and CPRI applications in enterprise networks, data centers, service provider networks, and telecommunications infrastructure. Must be used in matched pairs for BiDi operation.