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The 400G QSFP-DD (Quad Small Form Factor Pluggable Double Density) module is a hot-pluggable form factor designed for high-speed optical networking applications. QSFP-DD outlook and connector is like the current QSFP form factor, but it has an additional row of contacts provided for an eight-lane electrical interface that operates at 50 Gbps using PAM4 modulation supporting speeds up to 400G. Nowadays 400G is one of the highest data rates in the Ethernet world, offering improved capabilities for key aggregation and high‑bandwidth interconnection applications. These modules are commonly used in data centers, enterprise networks, and telecommunications infrastructure to support high-speed data transmission and meet the demands of emerging technologies like 5G. To ensure reliable data transmission, 400G QSFP-DD modules often incorporate Forward Error Correction. FEC helps detect and correct errors in transmitted data, improving the overall reliability of the communication link. 400G QSFP-DD has been defined by the QSFP-DD MSA Group as high-density, high-speed pluggable modules that are backward compatible with 200G QSFP-DD,100G QSFP28, and even 40G QSFP+. Our compatible QSFP-DD portfolio consists of transceivers that can operate over Single-Mode or Multi-Mode optical Fiber, can be used for connection distances from a couple of meters up to 40 kilometers, and can support up to 425 Gbps data rate and 400G Ethernet application. As well as 400G QSFP-DD AOC and 400G QSFP-DD DAC Cable, where they can be used. Our QSFP-DD portfolio consists of 400GBASE-SR8, 400GBASE-DR4/ DR4+, 400GBASE-FR4, 400GBASE-LR8, 400GBASE-LR4, 400GBASE-ER8, 400GBASE-ER4 Lite and 400G BIDI QSFP-DD which are defined by QSFP-DD MSA, 100G Lambda MSA, CMIS 4.0 and IEEE 802.3bs 400 Gbps specification. 400G-QSFP-DD transceivers can work on almost all networking equipment, where there is no special algorithm for protection against third-party modules. However – we have accumulated deep expertise in custom-encoded firmware for our 400G QSFP-DD portfolio to make these modules work in almost any brand of equipment. We will be glad to know your requirements – Contact Us.
400G QSFP-DD SR8 Optical Transceiver
In this MSA-compatible 400G QSFP-DD SR8 Optical Transceiver selection You will find an SR (Short Range) Multi-Mode Fiber 850nm Optical Transceiver for distances up to 100m (over OM5) equipped MTP/MPO-16 connector. Modules are available for 400G Ethernet (412.5Gbps) applications. On the transmission side module converts 8x 50G PAM4 (Pulse-Amplitude Modulation) electrical input channels (each 53.125Gbps) into 8x independent PAM4 optical signal with the baud rate of 53.125 Gbps.
400G QSFP-DD DR4 / DR4+ Optical Transceivers
The compatible 400G QSFP-DD DR4 / DR4+ Optical Transceiver modules are specifically engineered for 400-gigabit Ethernet applications, supporting data throughput up to 500 meters and 2 kilometers over single-mode fiber (SMF). Those modules utilize PSM4 (Parallel Single Mode 4-lane) technology over a wavelength of 1310nm and are equipped with an MTP/MPO-12 connector, facilitating efficient and high-density optical connections.
400G QSFP-DD FR4 Optical Transceiver
The 400G QSFP-DD FR4 Optical Transceiver selection consists of 400 Gigabit Optical Single Mode Fiber Double LC connector Transceiver, supporting data throughput up to 2 kilometers over single-mode fiber (SMF). On the transmission side module converts 8x 50G 400GAUI-8 PAM4 (Pulse-Amplitude Modulation) electrical input channels (each 53.125Gbps) into four 1270 nm, 1290 nm, 1310 nm, 1330 nm Single Lambda 100G PAM4 CWDM optical signals.
400G QSFP-DD LR4 Optical Transceiver
The 400G QSFP-DD LR4 Optical Transceiver selection consists of 400 Gigabit Optical Single Mode Fiber Double LC connector Transceiver, supporting data throughput up to 10 kilometers over single-mode fiber (SMF). As same as for FR4, 400G QSFP-DD LR4 Optical Transceiver on the transmission side converts 8x 50G 400GAUI-8 PAM4 (Pulse-Amplitude Modulation) electrical input channels (each 53.125Gbps) into four 1270 nm, 1290 nm, 1310 nm, 1330 nm Single Lambda 100G PAM4 CWDM optical signals.
400G QSFP-DD LR8 Optical Transceiver
MSA-compatible 400G QSFP-DD LR8 Optical Transceiver selection consists of Single Mode Fiber Double LC connector Transceiver, supporting data throughput up to 10 kilometers over single-mode fiber (SMF). On the transmission side, QSFP-DD LR8 converts 8x 50G 400GAUI-8 PAM4 (Pulse-Amplitude Modulation) electrical input channels (each 53.125Gbps) into eight (1273 nm, 1277 nm, 1282 nm, 1286 nm, 1295 nm, 1300 nm, 1304 nm, 1309 nm) Single Lambda 50G PAM4 LAN-WDM optical signals which are multiplexed for transmission over SMF.
400G QSFP-DD ER4 Optical Transceiver
The 400G QSFP-DD ER4 Optical Transceiver selection consists of 400 Gigabit Optical Single Mode Fiber Double LC connector Transceiver, supporting data throughput up to 40 kilometers over single-mode fiber (SMF). As same as for LR4, 400G QSFP-DD LR4 Optical Transceiver on the transmission side converts 8x 50G 400GAUI-8 PAM4 (Pulse-Amplitude Modulation) electrical input channels (each 53.125Gbps) into four 1270 nm, 1290 nm, 1310 nm, 1330 nm Single Lambda 100G PAM4 CWDM optical signals.
400G QSFP-DD ER8 Optical Transceiver
MSA-compatible 400G QSFP-DD ER8 Optical Transceiver selection consists of Single Mode Fiber Double LC connector Transceiver, supporting data throughput up to 40 kilometers over single-mode fiber (SMF). On the transmission side, QSFP-DD ER8 converts 8x 50G 400GAUI-8 PAM4 (Pulse-Amplitude Modulation) electrical input channels (each 53.125Gbps) into eight (1273 nm, 1277 nm, 1282 nm, 1286 nm, 1295 nm, 1300 nm, 1304 nm, 1309 nm) Single Lambda 50G PAM4 LAN-WDM optical signals which are multiplexed for transmission over SMF.
400G BIDI QSFP-DD Optical Transceiver
In this MSA-compatible 400G BIDI QSFP-DD Optical Transceiver selection You will find 400G BIDI Multi-Mode Fiber Optical Transceivers in distances up to 150m over OM5 with MTP/MPO-12 connector. This signal is carried over Tx/Rx Ch1: 850nm, Ch2: 908nm and the module accepts 8x 50G (400GAUI-8) host electrical data and transmits them in two groups of optical Bi-Directional lanes (each group contains 4 pairs of optical lane) to allow optical communication over optical multi-Mode fibers. Reversely, on the receiver side, the module accepts 8 sets of optical input signals and converts them to 8 channels of electrical data.
