Orange S.A.

About: Orange S.A. is a company organization based out in Paris, France. It is known for research contribution in the topics: Terminal (electronics) & Signal. The organization has 6735 authors who have published 9190 publications receiving 156440 citations. The organization is also known as: Orange SA & France Télécom.

Simultaneous edge flipping in triangulations

Abstract: We generalize the operation of flipping an edge in a triangulation to that of flipping several edges simultaneously. Our main result is an optimal upper bound on the number of simultaneous flips that are needed to transform a triangulation into another. Our results hold for triangulations of point sets and for polygons.

Demonstration of RSOA-based remote modulation at 2.5 and 5 Gbit/s for WDM PON

Abstract: This paper investigates the performance of a reflective semiconductor optical amplifier in a bidirectional wavelength-division multiplexed passive optical network at 2.5 and 5 Gbit/s over 20 and 15 dB link budget.

Common technical specification of the G-PON system among major worldwide access carriers

Abstract: Gigabit-capable passive optical networks (G-PONs) have been successfully standardized at ITU-T following the work done by the Full-Service Access Network (FSAN) group. G-PON is a powerful and flexible optical access system with various options to accommodate many services and interface types. In order to provide guidance to vendors on the key options required by operators at this time and hence speed up early volumes for large field trials and deployments, many of the major worldwide access carriers (AT&T, BT, DT, FT, KT, NTT, and TI) have developed a common technical specification (CTS) for G-PON systems. This article describes the G-PON standard and underlines the scope and results of the CTS

Linearly polarized fiber-optic laser

Abstract: A fiber-optic laser comprising a birefringent optic fiber possessing a Bragg grating at each of its ends,. A light source emits a light beam having two modes of polarization in the fiber. The birefringence of the fiber makes it possible to keep the two polarization modes separate. The two Bragg gratings are photo-recorded in the fiber and are made in such a way that their resonance wavelength is matched for one polarization. The wave emitted by the fiber is then polarized linearly along P1. Applications to linearly polarized lasers for optical transmission, instrumentation, spectroscopy, medicine, the detection of chemical species and telemetry.

A novel approach to achieve unequal error protection for video transmission over 3G wireless networks

Abstract: In this paper, we present a novel unequal error protection technique that enhances the video transmission quality over wireless networks. The case of application considered is a UMTS/TDD transmission system for H263 compressed and turbo-coded video sequences. The overall redundancy added to the compressed stream is non-uniformly distributed between the succeeding video frames in order to minimize the mean distortion over the transmitted sequence. The repartition of the redundancy on the video stream is optimized using an analytical approach which aims to alleviate the error propagation along the sequence. Different puncturing patterns of the rate 1 3 turbo-coder were considered in our simulations. The results obtained here are compared to those with a classical equal error protection scheme. We demonstrate that the gain in the system performances can reach 1.5 dB (in terms of the mean peak signal-to-noise ratio) without any significant increase in the transmission rate or the receiver complexity.