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Answered on 1:28 am
The 400G-DR4, 400G-XDR4 and 400G-PLR4 transceivers can interoperate with each other under certain conditions. The 400G-DR4 and the 400G-XDR4 can break out to 4x100G and interoperate with 4x100G-FR QSFPs over parallel single-mode fiber (SMF) with MPO-12 connector. The 400G-PLR4 can break out to 4x100G and interoperate with 4x100G-LR QSFPs over parallel SMF with MPO-12 connector. However, the 400G-DR4, the 400G-XDR4 and the 400G-PLR4 cannot interoperate with each other directly, as they use different optical modulation schemes and wavelengths. The 400G-DR4 and the 400G-XDR4 use PAM4 modulation and operate at 1310nm wavelength, while the 400G-PLR4 uses NRZ modulation and operates at CWDM4 wavelength. Therefore, to interconnect these transceivers, a conversion device or a multiplexer/demultiplexer is needed.
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