Journal ArticleDOI
Enhancing light slow-down in semiconductor optical amplifiers by optical filtering.
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TLDR
It is shown that the degree of light-speed control in a semiconductor optical amplifier can be significantly extended by the introduction of optical filtering, and good quantitative agreement with numerical simulations is shown.Abstract:
We show that the degree of light-speed control in a semiconductor optical amplifier can be significantly extended by the introduction of optical filtering. We achieve a phase shift of ~150° at 19 GHz modulation frequency, corresponding to a several-fold increase of the absolute phase shift as well as the achievable bandwidth. We show good quantitative agreement with numerical simulations, including the effects of population oscillations and four-wave mixing, and provide a simple physical explanation based on an analytical perturbation approach.read more
Citations
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Journal ArticleDOI
Microwave Photonic Signal Processing
TL;DR: This paper reviews the recent advances in the field of radio frequency signal processing using photonic devices and subsystems or microwave photonic (MWP) signal processing and highlights the most significant advances reported by different research groups in overcoming their main limitation factors.
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Wideband 360 degrees microwave photonic phase shifter based on slow light in semiconductor optical amplifiers.
TL;DR: This work demonstrates for the first time a continuously tunable 360 degrees microwave phase shifter spanning a microwave bandwidth of several tens of GHz (up to 40 GHz), exploiting the phenomenon of coherent population oscillations in combination with a regeneration stage realized by four-wave mixing effects.
Journal ArticleDOI
Widely Tunable Microwave Photonic Notch Filter Based on Slow and Fast Light Effects
TL;DR: In this paper, a continuously tunable microwave photonic notch filter at around 30 GHz is experimentally demonstrated and 100% fractional tuning over 360deg range is achieved without changing the shape of the spectral response.
Journal ArticleDOI
Widely tunable microwave phase shifter based on silicon-on-insulator dual-microring resonator.
TL;DR: Tunable microwave phase shifters based on electrically tunable silicon-on-insulator microring resonators with maximum phase-shifting range of 0-600 degrees are proposed and demonstrated.
Journal ArticleDOI
Theory of Optical-Filtering Enhanced Slow and Fast Light Effects in Semiconductor Optical Waveguides
TL;DR: In this article, a theoretical analysis of slow and fast light effects in semiconductor optical amplifiers based on coherent population oscillations and including the influence of optical filtering is presented, which is shown to enable a significant increase of the controllable phase shift experienced by an intensity modulated signal traversing the waveguide.
References
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Journal ArticleDOI
Observation of ultraslow light propagation in a ruby crystal at room temperature.
TL;DR: It is observed that a quantum coherence effect, coherent population oscillations, produces a very narrow spectral "hole" in the homogeneously broadened absorption profile of ruby, which leads to a large value of the group index.
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Photonic signal processing of microwave signals
TL;DR: In this paper, several photonic signal processors, including high-resolution microwave filters, widely tunable filters, arbitrary waveform generators, and fast signal correlators, are discussed, and a new concept for realizing multiple-tap coherence-free processor filters, based on a new frequencyshifting technique, is presented.
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Discrete-time optical Processing of microwave signals
TL;DR: In this paper, the fundamental principles and recent advances in the field of photonic filtering of microwave signals using discrete-time incoherent processing are presented and a comprehensive review of the fundamentals, applications, and current state of the art is provided.
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Slow light in a semiconductor waveguide at gigahertz frequencies
TL;DR: A semi-analytical model based on the effect of coherent population oscillations and taking into account propagation effects is derived and is shown to well account for the experimental results and it is shown that the carrier lifetime limits the maximum achievable delay.
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Slow and Fast Light in Semiconductor Quantum-Well and Quantum-Dot Devices
TL;DR: In this paper, the authors provide a review of recent progress of slow and fast light using semiconductor devices and discuss results obtained with semiconductor quantum-well/quantum-dot absorber and optical amplifiers.