FTCD4313E1PCL Finisar Compatible 400GBASE-FR4 QSFP-DD Transceiver

EdgeOptic's FTCD4313E1PCL 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, and the FTCD4313 family is now marketed under the Coherent Corp brand on distributor catalogs while retaining the Finisar SKU naming.

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.

The FTCD4313 family includes E1PCL, E2PCL, E2PXL, and E3PCL variants on distributor catalogs. The PCL suffix indicates commercial temperature class (0 to 70 °C); the PXL suffix indicates an extended-temperature variant on the same optical design. Check the Coherent Corp datasheet for the exact extended-temperature rating. The E1, E2, and E3 prefix differences are not publicly documented by Coherent Corp at the level of a primary datasheet, so the safe ordering practice is to verify the exact suffix on the chassis transceiver table or the installed module label and order the matching part. EdgeOptic supplies a compatible for E1PCL specifically; for an E2PCL or E2PXL request, use the corresponding sibling page.

The original FTCD4313E1PCL is an OEM transceiver shipped into 400G switching and routing platforms. EdgeOptic codes the EEPROM for Cisco, Arista, Juniper, 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.

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, commercial temperature 0 to 70 °C.

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.