400G Optical Transceivers
Use this series page to compare form factors, link reaches and interface directions before selecting a specific model. Final specifications, compatibility coding and delivery options remain tied to the ordered P/N and target host.
DR4 spreads four lanes across a parallel single-mode MPO trunk, which suits breakout to 4x100G. FR4 carries the full 400G over one duplex single-mode pair on LC, which drops into structured cabling that was never built for parallel trunks. Both are single-mode and neither substitutes for the other.
No. QSFP-DD, OSFP and QSFP112 are different form factors with different electrical interfaces, even at the same 400G line rate. Confirm the exact cage on the host port first; the rate label alone never establishes that a module will seat and link.
With a parallel PMD and a host that supports the lane mode, yes. The source port has to be configured for breakout and each 100G branch port must accept that rate. A duplex PMD such as FR4 or LR4 cannot break out regardless of host configuration, because the lanes are combined onto one fiber pair inside the module.
