Optical Interconnect Solution for 200G/400G Cloud Data Center

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The Cloud Data Center is the infrastructure of Cloud Computing. The cloud IT infrastructure is mainly composed of switches, servers and fiber optic cables, optical transceivers and active optical cables that interconnect them all. For the optical interconnection of Next-Generation 200G/400G Cloud Data Center, Gigalight offers a perfect solution. Let's get to know it.

The network architecture of the Next-Generation Cloud Data Center is generally pided into three layers, namely, Spine Core, Edge Core, and ToR (Top of Rack).

The Optical Interconnect Solution for 200G/400G Cloud Data Center

The transmission distance between the ToR access switches and the server NICs is generally less than 5m. For this case, the 200G solution is 25G or 50G DAC/AOC interconnects and the 400G solution is 50G or 100G DAC/AOC interconnects. The DAC (direct-attached copper cable) has the advantages of lower cost, power consumption and heat dissipation, while the AOC (active optical cable) has the advantages of lower weight, longer transmission distance, and easier installation and maintenance.

The transmission distance between the ToR access switches and the Edge Core switches is generally less than 100m. Optical transceiver and MTP/MPO cable can be used here. However, AOC is used more in fact. For this case, the 200G solution is 200G QSFP-DD AOC and 200G QSFP56 AOC. The 200G QSFP-DD AOC uses NRZ modulation, however, the future tends to the 200G QSFP56 AOC using PAM4 modulation. And the 400G solution is 400G QSFP-DD AOC that uses the 8x 50G PAM4 modulation technology.

The transmission distance between the Edge Core switches and the Spine Core switches is generally less than 2km. The 200G FR4 and 400G FR8 optical transceivers are used here and interconnected with duplex LC cables. For this case, the 200G solution is the 200G QSFP56 FR4 2km optical transceiver and the 200G QSFP-DD PSM8 2km optical transceiver, while the 400G solution is the 400G QSFP-DD FR8 2km optical transceiver.

From the Spine Core to the Core Router, which belongs to the DCI Metro Interconnect, the transmission distance is generally less than 100km. The CFP/CFP2 coherent optical transceivers are used here, interconnected with duplex LC cables. For this case, the 200G solution is the 200G CFP2-DCO optical transceiver.

Gigalight has a complete line of cloud data center products. And the optical interconnection products used in the Next-Generation 200G/400G Cloud Data Center have been launched or are being developed. The following products list is for reference.

Optical Transceivers

Product Name Max. Data Rate Form Factor Wavelength Max. Distance
400G QSFP-DD SR8 425Gbps QSFP56-DD 850nm 100m
400G QSFP-DD PSM8 425Gbps QSFP56-DD 1310nm 2km
400G QSFP-DD LR8 425Gbps QSFP56-DD LAN-WDM 10km
200G QSFP-DD LR4 212.5Gbps QSFP56-DD LAN-WDM 10km
200G QSFP-DD ER4 212.5Gbps QSFP56-DD LAN-WDM 40km
200G QSFP56 SR4 212.5Gbps QSFP56 850nm 100m
200G QSFP56 DR4 212.5Gbps QSFP56 1310nm 500m
200G QSFP56 FR4 212.5Gbps QSFP56 CWDM4 2km
200G QSFP56 uFR4 212.5Gbps QSFP56 CWDM4 2km
200G QSFP56 LR4 212.5Gbps QSFP56 LAN-WDM 10km
200G QSFP56 ER4 212.5Gbps QSFP56 LAN-WDM 40km
200G QSFP-DD SR8 206.25Gbps QSFP28-DD 850nm 100m
200G QSFP-DD PSM IR8 206.25Gbps QSFP28-DD 1310nm 2km
200G QSFP-DD PSM LR8 206.25Gbps QSFP28-DD 1310nm 10km
200G QSFP-DD CWDM8 206.25Gbps QSFP28-DD CWDM8 2km
200G QSFP-DD LR8 206.25Gbps QSFP28-DD LAN-WDM 10km

Active Optical Cables

Product Name Max. Data Rate Form Factor 1 Form Factor 2 Max. Length
400G QSFP-DD AOC 425Gbps/425Gbps QSFP56-DD QSFP56-DD 100m
400G QSFP-DD to 2x 200G QSFP56 AOC 425Gbps/212.5Gbps QSFP56-DD QSFP56 100m
400G QSFP-DD to 8x 50G SFP56 AOC 425Gbps/53.125Gbps QSFP56-DD SFP56 100m
200G QSFP56 AOC 212.5Gbps/212.5Gbps QSFP56 QSFP56 100m
200G QSFP56 to 4x 50G SFP56 AOC 212.5Gbps/53.125Gbps QSFP56 SFP56 100m
200G QSFP-DD AOC 206.25Gbps/206.25Gbps QSFP28-DD QSFP28-DD 100m
200G QSFP-DD to 2x 100G QSFP28 AOC 206.25Gbps/103.125Gbps QSFP28-DD QSFP28 100m
200G QSFP-DD to 4x 50G QSFP28 AOC 206.25Gbps/51.5625Gbps QSFP28-DD QSFP28 100m