Terahertz radiation shaping based on optical spectrum modulation in the time domain

Abstract

A terahertz shaping system based on optical fiber components as opposed to traditional free-space solutions is proposed. It is based on the time-domain modulation of the optical source spectrum. Standard singlemode fiber distributes and disperses the pulse before filtering its spectral components by means of the cross-gain and cross-phase modulation effects taking place in an interferometric semiconductor optical amplifier structure. Experimental measurements are obtained, showing the tunability of the system as well as its reconfigurability.

Quantum optical arbitrary waveform manipulation and measurement in real time

“…It is, however, challenging to transition this technology in its present form to the quantum domain because of the large insertion loss typically incurred, in addition to the inevitable modulation loss [11]. We note that OAWG devices using active gain are not applicable to quantum signals [12]. Such high losses or background noise levels can devastate quantum signals through decoherence and render single-photon states highly probabilistic and/or impure, making them unsuitable for quantum-optical applications particularly when on-demand quantum signals are desired.…”

Experimental characterization of extremely broadband THz impulse radio communication systems

“…Recently, such pulsed THz systems have attracted more research interests in developing high speed THz wireless communication because of its huge bandwidth [9]. So far, main efforts are however still focusing on analyzing THz propagation channel property [10] and shaping THz pulse [11] in a traditional THz spectroscopy system, due to the challenges associated with generation and detection of high repetition rate pulses.…”