GHz bandwidth noise eater hybrid optical amplifier: design guidelines

International audienceThis Letter describes the design of an optical amplifier system optimized to reduce the relative intensity noise (RIN) of the input signal, and discloses its performance in terms of intensity noise reduction and bandwidth, without phase noise degradation. This polarization-maintaining amplifier is composed of an erbium-doped fiber amplifier (EDFA) cascaded with a semiconductor optical amplifier (SOA). The EDFA is sized to feed the SOA with a constant power corresponding to the optimal saturation level for noise reduction, through coherent population oscillations. When properly optimized, such an amplifier provides, simultaneously, 17 dB optical gain, 5.4 dB noise factor, and 20 dB reduction of the input-RIN across a 3 GHz bandwidth, without any electronics feedback loop. (C) 2014 Optical Society of Americ

Narrow linewidth tunable terahertz radiation by photomixing without servo-locking

International audienceA beatnote, tunable from dc to 1 THz, provided by a dual-frequency laser is used to feed an unitravelling carrier photodiode in order to produce a highly coherent THz signal radiated by a transverse-electromagnetic-horn antenna. The THz signal is detected and analyzed by a subharmonic mixer coupled to an electrical spectrum analyzer. All components involved in this experiment operate at room temperature without phase locking the beatnote. So far, the dynamic range evolves from 58 dB at 282 GHz to 15 dB at 1.026 THz, and the measured linewidth is better than 30$~$ kHz. Linewidth narrowing using a Brillouin fiber laser pumped by the dual-frequency laser leads to a beatnote of 500-Hz linewidth at 1$~$THz

Laser bi-fréquences accordables pour la génération d'onde millimétrique et submillimétrique à haute cohérence.

National audienc

Laser bi-fréquences accordables pour la génération d'onde millimétrique et submillimétrique à haute cohérence.

National audienc

Dual frequency tunable laser system for a microwave and terahertz oscillator

International audienc

Oscillateur Micro-Onde à THz Ultra-Stable: Résultats Préliminaires

National audienceRésultats Préliminaires : Oscillateur Micro-Onde à THz Ultra-Stabl

Dual frequency tunable laser system for a microwave and terahertz oscillator

International audienc

Oscillateur micro-onde à térahertz ultra-stable

National audienc

High spectral purity microwave and terahertz oscillator

International audienceWe report on the design of an ultra stable microwave/THz oscillator and on the realization and the characterization of its laser source. The tunable oscillator is expected to show below -150 dB rad2/Hz phase instability at an offset frequency of 10 kHz for a 30 GHz carrier frequency, as well as 18 GHz, 100 GHz, 400 GHz and 1 THz carrier frequencies