FTCD4313E2PCL Finisar Compatible 400GBASE-FR4 QSFP-DD Transceiver

EdgeOptic's FTCD4313E2PCL compatible is a 400GBASE-FR4 QSFP-DD transceiver coded for the target switch chassis, with the same 2 km duplex single-mode reach, the same LC/UPC connector, and the same optical and electrical envelope as the Finisar original part. Finisar was acquired by II-VI Incorporated in September 2019; II-VI rebranded to Coherent Corp in July 2022, so the FTCD4313E2PCL is currently marketed under the Coherent Corp brand on distributor catalogs while the part-number naming stayed Finisar.

Four CWDM wavelengths at 1271, 1291, 1311, and 1331 nm multiplex onto a single duplex LC pair. PAM4 modulation at 53.125 GBaud per lane delivers 400 Gb/s aggregate throughput. EML transmitters drive each wavelength channel; PIN photodiode receivers handle the inbound side. TX power is -3.3 to +3.5 dBm per lane, RX sensitivity is -7.3 dBm. The 4 dB optical link budget covers a 2 km OS2 span with margin for patch panels and splices in normal data center cabling environments. Power under 10 W. Full 400GBASE-FR4 specifications cover the rest.

FTCD4313E2PCL ships in commercial temperature class, rated 0 to 70 °C case. The optically identical FTCD4313E2PXL is the extended-temperature variant, rated -5 to 85 °C, intended for outdoor or extended-environment deployments where case temperature can exceed the commercial range. The two share the same FR4 optical design and the same wavelength plan; the suffix indicates which temperature class the part is qualified to. Verify the suffix against the chassis transceiver table or the installed-module label before ordering, since data center deployments use PCL while outdoor and extended-environment plants use PXL.

The original FTCD4313E2PCL is an OEM transceiver shipped into 400G switching and routing platforms. EdgeOptic codes the EEPROM for Cisco, Arista, Juniper, HPE Aruba, or other targets so the same FR4 module can replace a failed Finisar part across mixed-vendor sites. Specify the target chassis vendor on the order and the module ships pre-coded for that platform; verify host compatibility against the platform vendor's transceiver matrix for the specific software release. Generic OEM EEPROM that has not been programmed for a specific brand-name chassis can trigger an unsupported-transceiver alert and keep the link down.

Conforms to IEEE 802.3cu, 100G Lambda MSA 400G-FR4, QSFP-DD MSA, and CMIS 4.0. CMIS exposes per-lane TX and RX optical power, module case temperature, supply voltage, and laser bias current over standard I2C, so DOM integrates with existing chassis monitoring through standard NOS diagnostic commands. KP4 RS-FEC (RS(544,514)) is required from the host ASIC at 400G to meet the PAM4 BER target. Class 1 laser safe per IEC 60825-1, CE and RoHS certified.

FR4 fits 400G data center interconnect, leaf-spine uplinks, and aggregation above a 100G leaf layer. Duplex LC patching keeps structured cabling simple where the existing single-mode plant already uses LC, the alternative to MPO-12 parallel optics on DR4. 2 km covers most intra-campus and metro-edge runs.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Made to order with a 2-week lead time and lifetime warranty included. For volume pricing or platform-specific EEPROM coding requests, contact our sales team.