Jun Shan Wey

Coherent Ultra Dense WDM Technology for Next Generation Optical Metro and Access Networks

Coherent optical communication has been well established as the technology of choice for long haul and high bit rate communication systems since a decade ago. Recent technology advances and ongoing price erosion further open the window of opportunity for the application of coherent optical transmission technology in other domains. This paper describes in detail the capabilities, design and implementation of a coherent ultra dense WDM technology for optical metro and access networks. Its capabilities enable a number of attractive options, such as variable downstream bit rates from 150 Mbit/s up to 10 Gbit/s per user, embedded OTDR and the coexistence with legacy systems such as GPON, EPON, XGPON or RF-Video in optical distribution networks. Due to its flexibility and capacity, it is also suitable for deployments in metropolitan networks, as well as for mobile front-haul and back-haul applications.

Physical layer aspects of NG-PON2 standards–Part 2: System design and technology feasibility [Invited]

This is the second of a two-part paper intended to provide technical insight and rationales behind the recently approved ITU-T G.989.2 Recommendation: the physical media dependent layer specification of the 40-gigabit-capable passive optical networks (NG-PON2). While Part 1 of the paper discusses topics related to the optical link design, Part 2 focuses on wavelength control, technology feasibility, management and control channel design, and potential future standardization directions of such a multi-wavelength PON system. As the NG-PON2 system will continue to evolve, technology extensions are also discussed to provide guidance for future research.

Physical layer aspects of NG-PON2 standards—Part 1: Optical link design [Invited]

NG-PON2 is the industrys first multiple wavelength (per direction), standards-based passive optical network system that is compatible with power-split optical distribution networks. The physical media dependent layer recommendation (ITU-T G.989.2) is the result of over three years of collaborative work by members of the FSAN and ITU-T Study Group 15, Question 2 groups. This two-part paper provides the technical insight and rationales behind the recently approved standard. The first part of the paper focuses on optical link design topics, including the optical distribution network characteristics, wavelength plan, Raman fiber nonlinearity related degradation, and interchannel cross-talk tolerance. It also describes the wavelength-tuning capability of optical network units and its impact on the physical media dependent layer specification.

Standardization Activities for IPTV Set-Top Box Remote Management

IPTV services are gaining widespread use, requiring service providers to have effective methods for remotely configuring and managing IPTV set-top boxes (STBs). Solutions for such remote management are becoming standards-based. This article examines published specifications and ongoing activities on IPTV STB remote management in four standards organizations: the Broadband Forum, the Digital Video Broadcasting Project, the Open IPTV Forum, and the Alliance for Telecommunication Industry Solutions IPTV Interoperability Forum. The authors compare the protocol and data model definitions, investigate interoperability test events, and comment on possible future directions for standardization.

Medium access control for the next-generation passive optical networks: the OLIMAC approach

Next-generation passive optical networks (NG-PONs) promise significant bandwidth increase to end users. Research and standardization efforts are underway to enable enhancements from contemporary PONs to NG-PONs. An area that has not been much investigated from the context of NG-PON2 (as defined by the Full Service Access Networking [FSAN] body) is the medium access control. We showcase for the first time the open problem of MAC implementation beyond WDM PONs, in NG-PON2 with multiple-line-rate channels. We propose a solution called OLIMAC, or the Open Lambda Initiative Medium Access Control, as a mechanism to provision bandwidth and guarantee a services framework in flexible wavelength spaced systems. The article describes the implementation of OLIMAC. The OLIMAC solution is shown to work with different protocols showcasing backward compatibility with existing end-user technologies while facilitating voluminous bandwidth to end users. The OLIMAC concept is simulated, and results show the benefit of the proposal as well as how OLIMAC is instructive in the implementation of NGPON2, especially for multirate flexible wavelength-spacing solutions.

Open Lambda Initiative for Ultra High Capacity Optical Access Networks

We propose an open network architecture framework and a new initiative to achieve ultra high capacity in optical access networks. We describe the framework objectives, rules and requirements, and a use case example.