In recent years, the data center market continues to maintain rapid growth. Servers used for artificial intelligence generated content (AIGC) has high requirements for the data transmission, demanding high-rate optical modules, which promotes the accelerated evolution towards 800G optical modules. We organized the investigation and evaluation of one typical type of 800G optical modules, 2×FR4, from 3 different vendors, the application of which is spreading rapidly in data centers. Key parameters have been tested and analyzed, including wavelength deviation, side-mode suppression ratio (SMSR), average launch power(each lane), outer optical modulation amplitude (OMAouter), receiver sensitivity (OMAouter), eye diagram, power consumption as well as DDM function. Interconnection and interworking has also been demonstrated both on instrument and switch. The results show current commercial 800G 2×FR4 optical modules are capable to meet the requirements of the standards that have been released.
The 5G fronthaul optical modules are the basic building block of the 5G network and WDM solutions are desired. Application code of MWDM has just been defined in ITU SG15 in December 2021 and are currently under intense study, naming draft recommendation G.owdm2. We organized the investigation and evaluation of MWDM optical modules from different vendors. Key parameters of optical/electrical interface have been tested and analyzed, including wavelength deviation, 20dB bandwidth, total mean output power, optical sensitivity, optical path penalty, eye diagram, power consumption as well as DDM function. Current commercial 25G MWDM optical modules are demonstrated capable to support transmission in O band covering almost all scenarios of 5G fronthaul.
The 5G fronthaul optical modules are the basic building block of the 5G network. With the further development of 5G, the shortage of optical fiber resources will gradually become prominent, and WDM solutions are desired. There are currently 4 WDM scheme candidates, CWDM, MWDM, LWDM and DWDM, and the debate over this issue continues. We organized the investigation and evaluation of one typical type of 25G optical modules (CWDM) from different vendors. Key parameters of optical/electrical interface have been tested and analysed, including spectrum characteristics, total mean output power, sensitivity, optical path penalty, eye diagram, power consumption as well as DDM function. Current commercial 25G CWDM optical modules are demonstrated capable to support 10 km transmission, covering almost all scenarios of 5G fronthaul.
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