Summary

Recommendation ITU-T G.698.6 provides optical parameter values for physical layer interfaces of wavelength division multiplexing (WDM) systems primarily intended for mobile fronthaul and metro applications in the O-band, optimized for 5 km transmission distances. Applications are defined using optical interface parameters and values for single-channel interfaces of multichannel WDM optical systems in point-to-point applications. This Recommendation uses a system architecture comprising a head-end equipment (HEE) connecting to the tail-end equipment (TEE) through a black link. For mobile fronthaul applications, the HEE is in a central office while the TEE is in a remote antenna site. A single bidirectional transmission fibre or a pair of unidirectional transmission fibres is used in the black link to connect the HEE to the TEE. This version of the Recommendation includes unidirectional and bidirectional WDM applications at 25 Gbit/s per channel with alternating channel wavelength spacing of 7 nm and 13 nm in the O-band.