Philippe Guignard

Perspective in next-generation home networks: Toward optical solutions?

The meaning of broadband connection is in continuous evolution. FTTH and ever-improving ADSL technologies are capable of offering to the final residential user a very-high-performance access network connection to the main door of our homes. At the same time, high-definition and interactive video will require higher and higher bit rates inside the home. Both drivers lead to the requirement for high-quality networking also inside homes, to avoid a somehow ironic, but indeed possible situation in which the home area network becomes the actual bottleneck of the full system. In this article we review the requirements for next-generation HANs and show that this environment may end up taking advantage of optical cabling solutions as an alternative to more traditional copper or pure wireless approaches.

Ultra-Broadband Wireless Home Network Based on 60-GHz WPAN Cells Interconnected via RoF

In this paper, we first identify the key requirements for the deployment of a 1-Gb/s ultra-broadband home area network (UBB-HAN). Second, we propose an architecture based on a transparent optical backbone feeding local access points. Third, we underline the role of the IEEE802.15.3c pre-standard to provide a suitable radio interface for the UBB-HAN and demonstrate the technical feasibility of the concept using radio over fiber (RoF). More than 1-Gb/s transmission is demonstrated for 50-m optical antenna remoting using radio-over-fiber plus 15-m radio transmission.

2-Dimensional optical CDMA system performance with parallel interference cancellation

In this paper, we investigate the feasibility of a 2 Dimensional Optical Code Division Multiple Access system (2DOCDMA), with electronic coding and decoding functions. We present a modified construction method of Multi-Wavelength Optical Orthogonal Codes (MWOOC) which permits high flexibility for the code parameters choice. Our objective is to evaluate the 2D code performance, with a Conventional Correlation Receiver (CCR) and a more complex one named Parallel Interference Cancellation receiver (PIC). For example, for a Bit Error Rate (BER)10-9, 30 simultaneous users and an electrical implementation, we show that contrary to the CCR, the use of a PIC receiver leads to workable 2D code solutions.

Source coherence impairments in a direct detection direct sequence optical code-division multiple-access system.

We demonstrate that direct sequence optical code- division multiple-access (DS-OCDMA) encoders and decoders using sampled fiber Bragg gratings (S-FBGs) behave as multipath interferometers. In that case, chip pulses of the prime sequence codes generated by spreading in time-coherent data pulses can result from multiple reflections in the interferometers that can superimpose within a chip time duration. We show that the autocorrelation function has to be considered as the sum of complex amplitudes of the combined chip as the laser source coherence time is much greater than the integration time of the photodetector. To reduce the sensitivity of the DS-OCDMA system to the coherence time of the laser source, we analyze the use of sparse and nonperiodic quadratic congruence and extended quadratic congruence codes.

Optical access evolutions and their impact on the metropolitan and home networks

This paper describes broadband optical access networks evolutions including high speed home interfaces for fixed and mobile services. Technical challenges are also discussed, namely concerning optical extended budget, 10 Gbit/s interfaces as well as the impact of access evolutions on the metropolitan network.

Flexibility in Access Networks : a Novel WDMA/TDMA Scheme for Passive Optical Networks

We propose a new access network scheme introducing WDM based flexibility, with dynamic rearrangement of customer connections. We focus on physical layer issues, simulation and experimental results are provided for a network without optical amplification.

Fair Resource Distribution Within the Flexible WDMA/TDMA Optical Access Network Based on GPON Infrastructure

In this paper a proposition for a flexible optical access network is presented. The general idea of a physical layer over an existing gigabit passive optical network (GPON) infrastructure is described, and three possible realizations are reported through laboratory experiments and computer simulations. Two algorithms for efficient bandwidth allocation in the time and wavelength domains have been designed, and the results of their application in one realistic scenario are reported. We found that the combined flexibility in the time and wavelength domains may handle burst arrivals in a cost-effective way and may be considered as a viable solution for upgrading optical access networks in the future.

Flexible Optical Access Network with SOA Amplification

A new scheme of WDM flexible amplified optical access network has been presented in this paper. Results of laboratory experiments, simulations of MAC layer and discussion over cost effectiveness have been provided.

2-Dimensional Optical CDMA System Performance with Parallel Interference Cancellation

In this paper, we investigate the feasibility of a 2 Dimensional Optical Code Division Multiple Access system (2DOCDMA), with electronic coding and decoding functions. We present a modified construction method of Multi-Wavelength Optical Orthogonal Codes (MWOOC) which permits high flexibility for the code parameters choice. Our objective is to evaluate the 2D code performance, with a Conventional Correlation Receiver (CCR) and a more complex one named Parallel Interference Cancellation receiver (PIC). For example, for a Bit Error Rate (BER)10-9, 30 simultaneous users and an electrical implementation, we show that contrary to the CCR, the use of a PIC receiver leads to workable 2D code solutions.

Scalable Optical Multi-service Home Network

We present a multi-service and scalable home network based on CWDM and broadcast and select technologies using single mode fiber. Network dimensioning is reported and the link budget is investigated in a multi-application configuration.