The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
With the fast increase of mobile data transfers, wireless communications carrier frequencies have entered in the millimeter wave region and now they enter in the submillimeter or terahertz region. In this context photonic-based emitters have several advantages, we will present our communication links results using photomixers at 0.2, 0.4 and 0.6 THz.
Narrow linewidth THz generation using a cascaded Brillouin fibre laser structure and a unitraveling carrier photodiode is proposed. Using two distributed feedback lasers separated by > 1 THz with 1 MHz initial linewidth, the linewidth of the realized THz source is found to be < 100 Hz at 1014.7 GHz without use of any active stabilization of the laser cavity or any microwave reference.
We propose a 600 GHz data transmission of high definition television using the combination of a photonic emission using an uni-travelling carrier photodiode and an electronic detection, featuring a very low power at the receiver. Only 10 nW of THz power at 600GHz were sufficient to ensure real-time error-free operation. This combination of photonics at emission and heterodyne detection lead to achieve...
By combining a UTC-PD as a THz emitter and a 400 GHz Schottky-based heterodyne detection, we realized an indoor THz link working up to 22 Gbps at 400 GHz carrier frequency with ultra-low THz power. The eye diagram at receiver is clearly opened are the system is working with only 1 µW received THz power.
The Fermi Pasta Ulam (FPU) recurrence is an ubiquitous phenomenon observable in many fields of physics. Its dynamics is mathematically well described by the nonlinear Schrödinger equation (NLSE), in particular through a class of solutions known as Akhmediev Breathers (ABs) [1]. This phenomenon been demonstrated experimentally in optical fibers a few years ago, in a system which was modeled by a pure...
Using a dual frequency Brillouin fiber laser and a 1.55 μm photomixer, we report the generation of a highly coherent kilo-Hertz level sub-millimeter wave emission. This system does not require any electrical synthesizer, and low cost telecom components are used to achieve very simple source architecture. The THz photomixer is composed of a uni-travelling carrier photodiode integrated with an antenna...
By submitting a cloud of cold caesium atoms to a periodically pulsed standing wave, we experimentally realized a quantum system presenting a dynamic that is chaotic in the classical limit called the Kicked Rotor. Such a system presents a phenomenon called dynamical localization (DL). DL is the suppression of the classical chaotic energy growth by quantum interferences due to long range coherence in...
We present a very simple system consisting in laser-cooled atoms interacting with a time-modulated standing laser wave. Such a system presents a quantum dynamics that can display different chaotic behaviors like quantum-chaos and quasi-classical chaos.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.