Pierpaolo Ghiggino

Colorless WDM-PON Architecture for Rayleigh Backscattering and Path-Loss Degradation Mitigation

The effectiveness of colorless performance- improved wavelength-division-multiplexing passive optical networks (PONs) compatible with gigabit-PON is presented. The proposed solution is based on a service optical network unit (service-ONU) for multiwavelength distribution. Mitigation of Rayleigh backscattering effect and path-loss degradation is demonstrated in 2.5- and 10-Gb/s reflective schemes employing reflective semiconductor-optical- amplifier and reflective electroabsorption modulator at the ONU.

Analysis of the automatic frequency control in heterodyne optical receivers

A theoretical analysis of the automatic frequency control (AFC) in binary DPSK and FSK heterodyne optical receivers is presented, and its impact on the system performance is evaluated. The effects of the shot-noise AM/FM conversion in the frequency discriminator are analyzed. It is shown that with commercial DFB lasers a common analysis of the frequency control loop can be done for the three modulations considered. Design guidelines are given that account for the presence of the AFC loop by properly using some performance results derived in the assumption of perfect frequency tracking. >

Testbed for experimental analysis on seamless evolution architectures from GPON to high capacity WDM-PON

The reuse of existing infrastructure whilst keeping unaffected the legacy equipment is a crucial feature for the evolution of gigabit passive optical networks (GPONs) towards higher capacity wavelength division multiplexed-passive optical networks (WDM-PONs). In this paper a testbed for the evaluation of simple and cost effective GPON evolutions will be presented. A comprehensive set of WDM-PON architectures based on remote wavelengths distribution and wavelengths reuse for upstream (US) transmission will be proposed. Both 2.5Gb/s and 10Gb/s (symmetric traffic) have been taken into account and experimentally evaluated in terms of bit error rate (BER) on the same testing bench. System perspectives and limitations are also discussed.

Colorless WDM-PON performance improvement exploiting a Service-ONU for multiwavelength distribution

A colorless performance-improved WDM-PON compatible with Gigabit-PON is presented. The proposed solution is based on a Service-ONU for multiwavelength distribution. Mitigation of Rayleigh backscattering effect and path-loss degradation is demonstrated in 2.5 Gb/s and 10 Gb/s schemes.

Characterization of a High Capacity Multi-User Optical Access Network Using 1 Gb/s 16 QAM Subcarrier Multiplexing

Error free operation assuming common FEC techniques is experimentally demonstrated for a multi-user optical access network based on 40 channel DWDM-PON infrastructure and Gigabit Ethernet 16 QAM subcarrier multiplexing transmission. Such a system would support 400 users with symmetrical 1.25 Gb/s connections and media independent final connectivity. To replicate actual working conditions, the experimental setup relied only on commercially available components and was tested with realistic distance reach and high sub-channel load.

Front Matter: Volume 7136

This PDF file contains the front matter associated with SPIE Proceedings Volume 7136, including the Title Page, Copyright information, Table of Contents, Introduction (if any), and the Conference Committee listing.

Fiber in access technologies and network convergence: an opportunity for optical integration

Broadband networks are among the fastest growing segment in telecom. The initial and still very significant push originated with xDSL technologies and indeed a significant amount of research and development is still occurring in this field with impressive results and allowing for a remarkable use of the installed copper infrastructure way beyond its originally planned bandwidth capabilities. However it is clear that ultimately a more suitable fiber based infrastructure will be needed in order to reduce both operational and network technology costs. Such cost reduction in inevitable as the added value to end users is only related to services and these cannot be priced outside a sensible window, whilst the related bandwidth increase is much more dramatic and its huge variability must be met with little or no cost impact by the network and its operation. Fiber in access has indeed the potential to cope with a huge bandwidth demand for many years to come as its inherent bandwidth capabilities are only just tapped by current service requirements. However the whole technology supply chain must follow in line. In particular optical technology must brace itself to cope with the required much larger deployment and greater cost effectiveness, whilst at the same time deliver performance suitable to the bandwidth increase offered in the longer term by the fiber medium. This paper looks at this issues and debates the opportunities for a new class of optical devices making use of the progress in optical integration