FTLX8511D3 Finisar Compatible 10GBASE-SR SFP+ Transceiver

EdgeOptic's 10G-SFP-300 compatible is a Finisar-coded 10GBASE-SR SFP+ transceiver matching the FTLX8511D3 part number. In Finisar's naming convention, the FTLX prefix designates 10G extended operating temperature range modules, while the 8511 portion identifies the 850 nm SR variant and the D3 suffix indicates the product revision. Finisar was acquired by II-VI in 2019 (now Coherent), but the FTLX8511D3 remains a widely referenced SKU across enterprise switching and routing platforms. The module transmits at 850 nm using a VCSEL laser at 10.3125 Gbps line rate per IEEE 802.3ae, with a PIN photodiode receiver. Maximum reach is 300 m on OM3 and 400 m on OM4, with a minimum optical budget of 6.1 dB. The duplex LC interface supports DDM/DOM diagnostics for real-time monitoring of transmit power, receive power, temperature, bias current, and supply voltage.

The FTLX8511D3 was a common OEM SR optic before the Coherent transition, appearing in bill-of-materials for Cisco, Juniper, Arista, HPE, and other enterprise platforms as a third-party-accepted module. Many network operators still reference this Finisar part number when sourcing replacements for installed infrastructure or specifying optics in new procurement RFPs. The chipset supports multi-rate operation from 1.25 to 10.3125 Gbps, covering 10G Ethernet, Gigabit Ethernet, and STM-64 (9.95 Gbps) applications depending on host port configuration. DDM threshold monitoring allows network management systems to track optical power degradation and generate alerts before link failures occur. Operating temperature range is 0 to 70 degrees C (commercial grade). The extended temperature designation in the FTLX prefix refers to Finisar's internal product classification rather than an industrial temperature range.

EdgeOptic encodes each module's EEPROM with Finisar vendor identification data, so platforms that accepted original Finisar optics will accept this compatible without additional configuration. The module is compliant with the SFP+ MSA (SFF-8432) and is CE/RoHS certified. Each unit passes optical parameter measurements (transmit power, receive sensitivity, extinction ratio), connector inspection, and EEPROM validation before shipment. For bulk pricing, replacement planning for legacy Finisar inventory, or multi-vendor environment support, contact our sales team.