ITU-T G.698.5 PDF

The purpose of this Recommendation is to provide optical interface specifications towards the realization of transversely compatible bidirectional dense wavelength division multiplexing (DWDM) systems in O-band, primarily intended for mobile fronthaul and metro applications.

This Recommendation defines and provides values for optical interface parameters of point-to-point WDM applications on single-mode optical fibres through the use of the black link approach with both of the propagation directions sharing the same optical fibre end-to-end.

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 is used in the black link to connect the HEE to the TEE. This version of the Recommendation includes bidirectional single-fibre WDM applications at 25 Gbit/s per channel with a nominal optical channel frequency spacing of 800 GHz.

For the applications in this version of the Recommendation, the black link does not contain optical amplifiers.

This Recommendation describes bidirectional WDM systems that include the following features:

– Operating wavelength band: the O-band;

– Nominal optical channel frequency spacing: 800 GHz;

– Nominal bit rate of signal channel: 25 Gbit/s;

– Nominal transmission distances: 10 km and 20 km;

– Maximum capacity: 6 bidirectional channels (at 12 wavelengths) at 25 Gbit/s.

Specifications are organized according to application codes.