HG Genuine MQD-77F2C Compatible 400GBASE-LR4 QSFP-DD Transceiver

EdgeOptic's MQD-77F2C compatible is an HG Genuine-coded version of the EdgeOptic 400G-QSFP-DD-11 multi-vendor 400GBASE-LR4 QSFP-DD transceiver. It carries the EEPROM identification a host expects for the HG Genuine MQD-77F2C optic and replaces the original part one-for-one for 400GbE LR4 links over single-mode fiber. The module reaches 10 km on duplex single-mode fiber.

MQD-77F2C carries 400 Gigabit Ethernet as four 100G PAM4 optical lanes on the CWDM4 grid at 1271, 1291, 1311 and 1331 nm per ITU-T G.694.2. The eight 50G PAM4 electrical channels on the host side are multiplexed to the four optical lanes inside the module, and a duplex LC/UPC connector pair carries all four wavelengths over one G.652 single-mode fiber in each direction. The line rate is 425 Gbps, which carries the 400GbE payload together with the RS(544,514) KP4 forward error correction overhead. This module is 400GbE only; it does not support Fibre Channel, OTN or SONET framing.

IEEE 802.3bs defines the 400GbE electrical and rate envelope; the LR4 optical PMD follows the 100G Lambda MSA 400G-LR4-10 specification. RS(544,514) KP4 forward error correction runs on the host ASIC, and both ends of the link must run the same FEC mode. The transmitter uses EML lasers and the receiver uses PIN photodiodes. Average launch power per lane runs from −2.8 dBm to +4 dBm, and average receiver sensitivity per lane is −9.1 dBm, giving a 7.1 dB average link budget for the 10 km span. The receiver overload point is +4.5 dBm and the minimum transmitter extinction ratio is 3.5 dB. Clock and data recovery is integrated, and the module reports temperature, supply voltage, laser bias, optical transmit power and optical receive power through DOM/DDM.

The module operates across the 0 to 70 °C commercial temperature range and draws up to 9 W. It works on switches and routers with QSFP-DD ports provisioned for 400GbE LR4. For 400GbE links over distances inside 2 km, a DR4 or FR4 module is the lower-cost choice; LR4 is the part to specify when the span needs the full 10 km of single-mode reach. Confirm the host port is set for 400GbE LR4 and that KP4 FEC matches at both ends during commissioning, and verify the optic against the chassis transceiver table for the target platform.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms, the MQD-77F2C compatible is made to order on a 2-week lead time and ships with a lifetime warranty. For volume pricing or deployment questions, contact our sales team.