Complete Guide to 400G QSFP-DD Optical Transceivers
Definition of 400G QSFP-DD Transceivers
QSFP-DD stands for Quad Small Form Factor Pluggable Double Density. What Double Density means? What’s the difference with the QSFP and QSFP28?
The 400G QSFP-DD Transceiver follows the same port densities system as the QSFP and QSFP28, but the QSFP-DD will support eight lanes instead of four lanes for the QSFP and QSFP28, which double the density.
Each of the eight lanes will operate a data rate up to 50Gb/s providing a 400Gb/s data speed and increasing the capacity of the QSFP28 by four. The 400G QSFP-DD MSA published that the size of the optical transceivers enables to put 36 ports in one switch slot, accumulating 14.4 Tbp/s in one slot.
Multi-mode transceivers are the low cost transceivers. QSFP-DD SR8 use more expensive non-standard MPO connectors which cancel out some of the cost savings of the multi-mode transceiver.
400G QSFP-DD SR8
The 400G QSFP-DD SR8 transceiver supports connections of up to 100 meters over multi-mode fiber and uses MPO connectors. The wavelength is 850nm. It is compliant with the QSFP-DD MSA.
Single-Mode transceivers are more expensive than multi-mode transceivers but they allow to reach longer distance.
400G QSFP-DD DR4
The 400G QSFP-DD DR4 transceiver supports connections of up to 500 meters over single-mode fiber and uses MPO connector. The wavelengths is 1310nm. It is compliant with the QSFP-DD MSA.
400G QSFP-DD DR4+
The 400G QSFP-DD DR4+ supports connections of up to 2 kilometers over single-mode fiber and uses MPO connector. The wavelengths is 1310nm. It is compliant with the QSFP-DD MSA.
The 400G QSFP-DD LR4 transceiver supports connections of up to 10 kilometers over single-mode fiber and uses LC connectors. The wavelengths are 1296 to 1309nm. It is compliant with the QSFP-DD MSA.
The best solution for testing switches and servers ports is the passive electrical loopback transceiver. The loopback transceiver works by simulating the communication between two devices by transmitting the data (output) and receiving it (input).
400G QSFP-DD Loopback
The 400G QSFP-DD Loopback is a cost effective and high quality solutions to test 400G QSFP-DD transceivers ports.
||Optech Part Number
||400G QSFP-DD SR8
||850nm, 100m, MPO
||400G QSFP-DD DR4
||1310nm, 500m, MPO
||400G QSFP-DD DR4+
||1310nm, 2km, MPO
||400G QSFP-DD LR4
||1310nm, 10km, LC
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Optech offers a broad range of networking and communication solutions in following categories: Optical Transceivers, SFP, 10G SFP+, 25G SFP28, 40G QSFP+, 100G QSFP28 , 400G QSFP-DD, Direct Attach Cables (DAC), Active Optical Cables (AOC), Ethernet Media Converter, Fiber Optical Patchcord, BWDM, CWDM, DWDM Mux/Demux and Repeater products.
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