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International Conference on Transparent Optical Networks

True time delays and phase shifters based on slow light technologies for microwave photonics applications

Juan Lloret, Juan Sancho, Ivana Gasulla, Salvador Sales, J. Capmany

Published Jun 1, 2011• 1 citation
Publisher

Abstract

This paper presents the salient results related to the proposal, implementation and characterization of true time delays and phase shifters based on Slow and Fast Light technologies developed by our group within the framework of the ICT-FET GOSPEL funded by European Union. In particular, results based on the use of coherent population oscillations in Semiconductor Optical Amplifiers and Brillouin Effects in optical fibers will be described.

DOI
10.1109/icton.2011.5971119

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This paper presents the salient results related to the proposal, implementation and characterization of true time delays and phase shifters based on Slow and Fast Light technologies developed by our group within the framework of the ICT-FET GOSPEL funded by European Union. In particular, results based on the use of coherent population oscillations in Semiconductor Optical Amplifiers and Brillouin Effects in optical fibers will be described.
We provide a comprehensive review of the application of slow and fast light (SFL) techniques to the field of microwave photonics. Basic principles leading to the implementation of phase shifting and true time delay operations which are instrumental in this field are first considered. We then focus on the description of the main results obtained by our groups in the implementation of broadband, full 360 phase shifting using coherent population oscillations in semiconductor waveguides. Next, attention is given to the evaluation of the system impairments implied by these devices when included in analog links. Finally, the main results obtained for several microwave photonic applications such as filtering, arbitrary waveform generation and optoelectronic oscillators (OEOs) are reviewed, and other directions for future research in the field are discussed.
In this talk we show how slow and fast light effects arising from the nonlinear gain and refractive index dynamics within semiconductor optical amplifiers can be used to control the phase shift of microwave frequency signals. Theoretical predictions with experimental conformation will be shown as to how continuous phase shifting can be achieved and pay particular attention to the noise issue that arises in such phase shifters. Finally, applications of such phase shifters, including realizations of tunable microwave notch filters and tunable optoelectronic oscillators will be presented.
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