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Must-read 400G QSFP-DD DR4 optical modules and connectivity solutions
Industry Dynamic + 2023.11.08

With the increased demand for faster and more reliable networks, 400G has become one of the most popular optical modules when interconnecting next-generation data centre networks.QSFP-DD is the 400G solution needed for next-generation cloud computing networks. To facilitate better network deployment, Walsun will introduce a 400G QSFP-DD DR4 optical module for short-haul single-mode applications. Next, let's learn more about 400G QSFP-DD DR4 optical module.

Product Characteristics

400G QSFP-DD DR4 is a 4-channel full-duplex transceiver module in a hot-swappable QSFP-DD package, with a rate of up to 425Gbps, compliant with the QSFP-DD MSA and the IEEE 802.3bs 400GBASE-LR8 Ethernet standard, and adopts the MPO interface, with an operating wavelength of 1310nm, a maximum power consumption of 12W, and is RoHS compliant. 

QSFP-DD packages are favoured for 400G due to their high speed, small size, pluggability, etc. 400G QSFP-DD optical modules have become one of the most popular optical modules when interconnecting next-generation data centre networks. With the standardisation of 400G, major vendors and suppliers have developed different types of 400G QSFP-DD optical modules.

A 400GBASE-SR8 QSFP-DD optical module that should be hot in the market now has a transmission distance of up to 100m over multimode fibre, and is used in 400G Ethernet, high-performance data centre and cloud networks, supporting 400G-400G direct connect, 400G-2*200G interconnect (using 16-core MTP/MPO to 2*8-core MTP/MPO branch). patch cords to connect 400G QSFP-DD SR8 and two 200G QSFP56 SR4s) and 400G-8*50G interconnect (16-core MTP/MPO to 8*LC duplex patch cords to connect 400G QSFP-DD SR8 and eight 50G SR modules).

400G QSFP-DD series optical modules can be applicable equipment:

Cisco HW H3C Juniper Arista Brocade Dell Extreme Generic Intel Finisar Ciena Avago Mikrotik Allied Telesis IBM F5 Networks Palo Alto Networks Fortinet Check Point Chelsio Edge-Core D-Link Alcatel-Lucent

Connectivity Solutions

400G QSFP-DR4 optical module adopts 1310nm EML transmitter type and PAM4 Pulse Amplitude Modulation (PAM4) for signals, with a transmission distance of up to 500m over single-mode optical fibre, which is suitable for short-distance 400G and 200G/100G optical interconnections. The following are two connection options for 400G QSFP DR4 optical modules:

1, can be connected to the opposite end 100G QSFP28 DR optical module through MPO-12 to 4*LC duplex branch fibre patch cable.


2, 400G transmission can be achieved by connecting 400G QSFP-DD DR4 optical modules at both ends in the server room via MPO/MTP-8 single-mode fibre patch cords.


At the same time, silicon optical chip technology has matured and developed. 400G QSFP-DD DR4 silicon optical module adopts silicon optical chip to achieve ultra-large capacity data exchange while effectively controlling the cost and power consumption. With the continuous development of 400G large-scale data centres, the demand for 400G QSFP-DD DR4 optical modules is increasing.