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Question 2

​Optical systems for fibre access networks

(Continuation of Question 2/15)

Recommendations for point-to-point and point-to-multi point optical access systems, such as the G-PON (G.984 series) and XG-PON (G.987 series), have allowed telecommunications manufacturers to develop inter-operable optical access equipment, by which Fiber To The Home has become reality. Practical experience with the design and deployment will necessitate revision of these Recommendations to include, for example, enhanced services, better interoperability, higher split ratios and increased capacity.

To provide new features in optical access, such as wavelength division multiple access (WDMA), orthogonal frequency division multiple access (OFDMA), and hybrid xDMA/yDMA systems, will necessitate the development of new Recommendations.

Fibre access systems need to support a range of service capabilities at the edge. Wireless, wireline and fibre (e.g. G.65x and Plastic Optical Fibre (POF)) will be needed. Economies are needed for fibre access deployment to become prevalent as a mass-market solution. Demand will be driven by factors such as: the ability to carry interactive and broadcast services (e.g. residential video, HDTV), managed bandwidth to multiple Internet Service Providers (ISPs), together with higher quality of service and improved resilience. Solutions are required for a wide range of market segments and situations including: business, small-to-medium-enterprise, small-office-home-office, residential and mobile backhaul, as well as green field and network upgrade.

To support current and/or future wireless/mobile services, optical access systems are expected to provide flexible broadband communication channels for plural base stations in some cases, and to support digital and/or analogue transmission of Radio Frequency signals for remote base stations in some other cases.

Demand for dedicated GbE and 10GbE services initially to business users is increasing. New techniques are needed to increase performance and reduce costs for both dedicated and shared bearer services. Both access and metro networks should be considered when offering such access services, because currently, access nodes are sometimes bypassed to minimize overall network cost. Both Point-to-point and point-to-multi-point solutions will be considered.

Integration of all services onto a single backhaul fibre network is an important economic consideration for network operators.

To be successful, Q2/15 needs to harmonize with other bodies which have a strong optical access industry role, such as IEEE and IEC. The following major Recommendations in force fall under its responsibility: G.981, G.982, G.983 series, G.984 series, G.985, G.986, G.987 series, G.988, G.989 series, G.9801, and G.9802.

What new architecture, technologies and protocols are needed to:
What enhancements to existing Recommendations are needed to improve interoperability between Optical Network Unit (ONU) and Optical Line Terminal (OLT)? 
What new or enhancements to existing Recommendations are needed to:
Study items to be considered include, but are not limited to:
Tasks include, but are not limited to:

NOTE − An up-to-date status of work under this Question is contained in the SG15 Work Programme at  


Study Groups: 
Standardization bodies, forums and consortia: