scope:

This Recommendation describes some extended functions for the ATM-PON system defined in ITU-T G.983.1.

This Recommendation describes the Broadband Passive Optical Network (BPON) system that uses wavelength division multiplexing techniques (WDM). These WDM techniques allow operators to provide additional services without disturbing the basic ATM-PON system.

This Recommendation defines new wavelength allocations to distribute ATM-PON signals and additional service signals simultaneously. New wavelength bands for additional services are made available by constraining the current ATM-PON downstream wavelength to a portion of downstream optical spectrum originally specified in ITU-T G.983.1. The new bands have potential to provide unidirectional and bidirectional services. The wavelength allocation defined in this Recommendation enables the distribution of video broadcast services or data services, and the general optical characteristics of these services are taken into account. However, the detailed specifications of these services, such as modulation scheme, signal format, and so on are beyond the scope of this Recommendation.

This Recommendation defines new reference points and optical interface parameters because of the new WDM and/or optical power splitter/combining functions needed at OLT and/or ONU sites.

However, the reference points and Optical Access Network (OAN) described in this Recommendation will remain compatible with the existing ITU-T G.982 and G.983.1.

This Recommendation also defines new environmental conditions required for the ONU equipment. These conditions are required for outside plant applications of the ATM-PON system.

This Recommendation describes the relevant differences from ITU-T G.983.1. However, sections that specify the TC layer are not included in this Recommendation, because they are not relevant to WDM enhancements. The specifications of the TC layer are given by other Recommendations, such as ITU-T G.983.1.