800G transceivers utilize the same form factors as 400G optics, namely the OSFP and QSFP-DD.
OSFP: The OSFP, which stands for "Octal Small Form-factor Pluggable," is named "Octal" because its electrical interface consists of 8 electrical lanes. In the case of 800G, each electrical lane is modulated at 100Gb/s, resulting in a total bandwidth of 800Gb/s.
QSFP-DD: The QSFP-DD, which stands for "Quad Small Form-factor Pluggable - Double Density," shares a similar form factor with the QSFP but features an additional row of electrical contacts to accommodate more high-speed electrical lanes. While a QSFP has 4 high-speed electrical lanes, a QSFP-DD has 8. In the context of 800G, each electrical lane of the QSFP-DD operates at 100Gb/s, providing a total bandwidth of 800Gb/s.
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