FTLC1154SDPL4 Coherent (formerly Finisar) Compatible 100G QSFP28 LR4/OTU4 Industrial

EdgeOptic's FTLC1154SDPL4 compatible is a Coherent (formerly Finisar)-coded 100GBASE-LR4 QSFP28 transceiver built on the EdgeOptic 100G-QSFP28-10 platform and rated for industrial-temperature operation. Finisar was acquired by II-VI Incorporated in 2019 and rebranded as Coherent Corp in 2022, so the same module family appears in current procurement under both Finisar and Coherent branding. EdgeOptic's compatible matches the standard 100GBASE-LR4 optical and electrical specifications and supports OTU4 transport at 111.81 Gbps on the same LAN-WDM wavelength plan, so it covers both rate modes that the FTLC1154SDPL4 ordering code targets. The industrial-grade case temperature window (-40 to +85°C) makes this variant the destination for outside-plant cabinets, mobile cell sites, transportation tunnels, and uncontrolled-environment data hall extensions where the commercial-temperature FTLC1154SDPL is not rated to operate.

The optical interface follows IEEE 802.3ba Clause 88 100GBASE-LR4 and ITU-T G.709 OTU4 4I19D1F. Four NRZ lanes on the LAN WDM grid at 1295.56, 1300.05, 1304.58, and 1309.14 nm multiplex onto a single LC duplex pair of single-mode fiber. In 100GBASE-LR4 mode the aggregate line rate is 103.125 Gbps; in OTU4 transport mode the aggregate is 111.81 Gbps on the same wavelength plan, giving a single SKU that covers both Ethernet uplink and OTN client-side roles. The 6.3 dB optical path loss budget supports a full 10 km reach on G.652 SMF. The module operates on a single 3.3 V supply and reports DDM telemetry per SFF-8636 for tx power, rx power, bias current, supply voltage, and case temperature.

EdgeOptic's compatible carries the FTLC1154SDPL4 ordering code so procurement records and chassis inventory output stay consistent with the part number called out in the equipment configuration. The compatible carries Class 1 laser safety classification, RoHS compliance, and CE marking. Typical deployment scenarios include hardened ISP aggregation and backhaul links, mobile operator core sites in unconditioned shelters, transportation and industrial control networks, and data-center site interconnects on QSFP28 hosts that accept third-party 100GBASE-LR4 optics per the QSFP28 MSA.

Verify the entry for your specific NIC, switch, or router in the vendor's transceiver compatibility matrix before deployment. Ships next business day from EU stock with a lifetime warranty. Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. For volume orders, custom EEPROM programming, or pre-sales engineering questions, contact our sales team.