Home News&Events Next-generation PON standard adds wavelength division multiplexing

Wednesday28 June 2017

Next-generation PON standard adds wavelength division multiplexing

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Full Service Access Network Organization Recommends Path for Next-Generation PON Technology

Industry Experts in FSAN Agree on Technology for NG-PON2 for Greater System Capability and Enhanced Services

 The Full Service Access Network (FSAN) group has chosen wavelength division multiplexing (WDM) to complement PON's traditional time-sharing scheme for the next-generation PON standard.

Known as NG-PON2, the TWDM-PON scheme will enable operators to run several services over one network: residential broadband access, business services and mobile back-hauling. In addition, NG-PON2 will support dedicated point-to-point links – via a WDM overlay - to meet more demanding service requirements.

TWDM-PON is a pragmatic choice by FSAN, enabling operators to avoid having to change the outside plant. Instead, changes will be confined to the PON's end equipment: the central office's optical line terminal (OLT) and the home or building's optical networking unit (ONU).

NG-PON2's basic configuration will use four wavelengths, resulting in a 40Gbps PON. Support for eight (80G) and 16 wavelengths (160G) are also being considered. Each wavelength will support 10Gbps downstream (from the central office to the end users) and 2.5Gbps upstream (XGPON) or 10Gbps symmetrical services for business users.

"The idea is to reuse as much as possible the XGPON protocol in TWDM-PON, and carry that protocol on multiple wavelengths," says Derek Nesset, co-chair of FSAN's NGPON task group. Other NG-PON2 specifications include the support of at least 1Gbps services per ONU and a target reach of 40km. NG-PON2 will also support 60-100km links but that will require technologies such as optical amplification.

The technology choice for NG-PON2 is good news for system vendors such as Huawei and Alcatel-Lucent that have already done detailed work on TWDM-PON systems. FSAN will work through the International Telecommunication Union (ITU) to turn NG-PON2 into a standard. Standards-compliant NG-PON2 equipment is expected by 2014 and be deployed by operators from 2015. But much work remains to flush out the many details and ensure that the standard meets the operators’ varied requirements.

For further information: ECOC 2012; FSAN; Gazettabyte

 

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