La guerre des Balkans:élites nationales et discours transnationaux dans la française, allemande et britannique

Cet article repose sur une étude de la presse de lEstablishment en France, en Allemagne et au Royaume-Uni, au cours de la guerre des Balkans en 1999. Les sources sont la Frankfurter Allgemeine Zeitung, Le Monde et le Financial Times. Lobjectif est de voir en quoi la manière de rapporter les événements révèle des priorités politiques des diverses élites qui lisent ces journaux, ainsi que de leur perception de lordre international. Le résultat des travaux indique lexistence dun certain degré de synchronisation dans la façon dont la presse a concentré lattention de lopinion publique ; il indique aussi quil existe des différences sensibles entre ces journaux français, allemand et britannique, en termes de contenu et de perspectives. Malgré lexistence dun discours transnational, la sphère publique européenne demeure fragmentée. This article is based on a study of the press in France, Germany and the United Kingdom, during the Balkans war in 1999. The sources are the Frankfurter Allgemeine Zeitung, Le Monde and the Financial Times. The objectve is to see how report events reveal the priorities of the various political elites who read these newspapers, as well as their perception of international lordre. The outcome of the study indicates some degree of synchronization in the way the press has focused mindfulness of public opinion and that it also indicates there are significant differences between the French newspapers, German and British, in terms of content and perspectives. Despite the existence of a transnational speech, the European public sphere remains fragmented.

Isolator-free switchable uni- and bidirectional hybrid mode-locked erbium-doped fiber laser

An Erbium-doped fibre ring laser hybrid mode-locked with single-wall carbon nanotubes (SWNT) and nonlinear polarisation evolution (NPE) without an optical isolator has been investigated for various cavity conditions. Precise control of the state of polarisation (SOP) in the cavity ensures different losses for counter-propagating optical fields. As the result, the laser operates in quasi-unidirectional regime in both clockwise (CW) and counter-clockwise (CCW) directions with the emission strengths difference of the directions of 22 dB. Furthermore, by adjusting the net birefringence in the cavity, the laser can operate in a bidirectional generation. In this case, a laser pumped with 75 mW power at 980 nm generates almost identical 790 and 570 fs soliton pulses with an average power of 1.17 and 1.11 mW. The operation stability and pulse quality of the soliton pulses in both unidirectional regimes are highly competitive with those generated in conventional ring fibre lasers with isolator in the cavity. Demonstrated bidirectional laser operation can find vital applications in gyroscopes or precision rotation sensing technologies.

Uni-and bidirectional hybrid mode-locked erbium-doped isolator-free fibre laser

We have investigated a hybrid mode-locked Erbium-doped fibre ring laser without optical isolator. Creating different losses in the cavity for counter-propagating pulses via net birefringence adjusting, the laser can operate in both unidirectional regimes with extinction over 22 dB, as well as can establish stable bidirectional generation.