30Aug, 2021
GIGALIGHT Returns to the Competition Track of Data Center Passive DAC
Shenzhen, China, August 30, 2021 − GIGALIGHT’s today launched an 8-channel 400G QSFP56-DD passive direct-attached cable (PCC) assembly that supports 3m transmission, marking its successful return to the technology track of DAC products.
The newly developed 400G QSFP56-DD PCC assembly can reach a maximum transmission distance of 3m, the insertion loss is better than 17.16dB@13.28GHz, the Pre-FEC bit error ration is better than average 1E-8, and the Post -FEC bit error ration is better than 1E-14 level, showing superior consistency of each channel.
(Partial testing diagram of 400G DACs)
Case A CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
PreBER 1.02E-08 4.79E-08 3.65E-08 9.09E-09 2.11E-08 8.39E-09 7.56E-08 5.03E-07
PostBER 0 0 0 0 0 0 0 0
Margin 71 43 43 43 57 71 57 43
Table ：400G QSFP56-DD 3m DAC Case A
Case B CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
PreBER 2.26E-09 9.72E-09 2.88E-09 1.30E-08 1.82E-08 2.68E-09 1.99E-08 2.72E-07
PostBER 0 0 0 0 0 0 0 0
Margin 71 71 57 43 71 71 71 57
Table 2：400G QSFP56-DD 3m DAC Case B
GIGALIGHT has started the R&D and production of passive DAC assemblies since 2011 and gained a large amount of customers of Passive DAC products worldwide. Through 10 years of technological innovation and practice, the company has completely solved the compliance problem of COM computing software & hardware and protocols, and has endowed high-density DACs with a set of efficient and reliable manufacturability procedures.
Over the years of R & D, GIGALIGHT has a complete family of DAC and its branch products:
Product name Protocol Maximum insertion loss Transmission distance
10G SFP+ PCC IEEE 802.3ae 17.04dB@5.16GHz 7m
25G SFP28 PCC IEEE 802.3by 22.48dB@12.89GHz 5m
40G QSFP PCC IEEE 802.3ba 17.04dB@5.16GHz 5m
100G QSFP28 PCC IEEE 802.3bj 22.48dB@12.89GHz 5m
200G QSFP56 PCC IEEE 802.3cd 17.16dB@13.26GHz 3m
400G QSFP-DD PCC IEEE 802.3cd 17.16dB@13.26GHz 3m
Table 3: GIGALIGHT DAC and branch product family

About GIGALIGHT

As the open optical network device explorer, GIGALIGHT integrates the design, manufacture and sales of active & passive optical devices and subsystems. The main products are optical transceivers, silicon photonics transceivers, liquid cooling transceivers, optical passive components, AOC & DAC, coherent optical modules and open DCI BOX subsystems. GIGALIGHT is a hardware solution provider of innovatively designed high-speed optical interconnection that focuses on data center, 5G carrier network, metro WDM transmission, UHD broadcast video and other application fields.