Coherent control in a semiconductor optical amplifier operating at room temperature

Capua, Amir; Karni, Ouri; Eisenstein, G.; Sichkovskyi, Vitalii; Ivanov, V.; Reithmaier, Johann Peter

doi:10.1038/ncomms6025

Cited by 20 publications

(12 citation statements)

References 31 publications

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“…The equation was derived under the assumption that the magnetocrystalline and demagnetization fields are small compared to the external field. The apparent agreement indicates that the ensemble-averaged Rabi oscillations are observable in the ferromagnetic film and implies that the well-established methods and techniques used in coherent quantum processing can be applied on ferromagnetic materials and vice versa36.…”

Section: Resultsmentioning

confidence: 57%

Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film

et al. 2017

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Rabi oscillations describe the process whereby electromagnetic radiation interacts coherently with spin states in a non-equilibrium interaction. To date, Rabi oscillations have not been studied in one of the most common spin ensembles in nature: spins in ferromagnets. Here, using a combination of femtosecond laser pulses and microwave excitations, we report the classical analogue of Rabi oscillations in ensemble-averaged spins of a ferromagnet. The microwave stimuli are shown to extend the coherence-time resulting in resonant spin amplification. The results we present in a dense magnetic system are qualitatively similar to those reported previously in semiconductors which have five orders of magnitude fewer spins and which require resonant optical excitations to spin-polarize the ensemble. Our study is a step towards connecting concepts used in quantum processing with spin-transport effects in ferromagnets. For example, coherent control may become possible without the complications of driving an electromagnetic field but rather by using spin-polarized currents.

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Section: Resultsmentioning

confidence: 57%

Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film

et al. 2017

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“…Finally, the transition between the semi-classical and the classical regimes of light-matter interactions, namely the process of quantum mechanical dephasing, can be mapped using a coherent Ramsey analogous experiment [22], where one pulse sets the quantum coherent state of the system and a second one probes it as it evolves in time and dephases.…”

Section: Introductionmentioning

confidence: 99%

Breakthroughs in Photonics 2014: Time-Scale-Dependent Nonlinear Dynamics in InAs/InP Quantum Dot Gain Media: From High-Speed Modulation to Coherent Light–Matter Interactions

et al. 2015

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The dynamical properties of InP-based quantum dot (QD) gain media are surveyed and analyzed for three time scales ranging from tens of picoseconds to less than 200 fs, where quantum coherent phenomena are observable. Each of these time scales determines the important properties of QD devices, i.e., modulation capabilities, nonlinear gain, and coherent light-matter interactions. Experimental investigations and modeling results are described, highlighting the state of the art in QD devices for the important 1550-nm telecom wavelength range.

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“…The power and the pulse duration of the SOA input pulse train are dBm 14  and ps 2 . 3 , respectively. It is found that the SOA optimized bias current becomes larger at a higher repetition rate.…”

Section: Relation Between Soa Optimized Bias Current and Input Pulse mentioning

confidence: 99%

“…Semiconductor optical amplifiers (SOAs) have become the key devices in the integrated optical systems and passive optical networks (PON) for the advantages of high energy-efficient, wide operational bandwidth and small size [1][2][3][4][5][6][7]. However, the gain saturation mechanism in SOAs causes the distortion of the amplified output pulse.…”

Section: Introductionmentioning

confidence: 99%

High-speed pulse train amplification in semiconductor optical amplifiers with optimized bias current

et al. 2017

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In this paper we have experimentally investigated the optimized bias current of semiconductor optical amplifiers (SOAs) in order to achieve the high-speed input pulse train amplification with high gain and low distortion. Variations of the amplified output pulse duration with the amplifier bias currents have been analyzed and it is found that compared with the input pulse duration, the amplified output pulse duration is broadened; as the SOA bias current decreases from the high level (larger than the saturated bias current) to the low level, the broadened pulse duration of the amplified output pulse initially decreases slowly and then rapidly. Based on the analysis, an optimized bias current of SOA for high-speed pulse train amplification is introduced. The relations between the SOA optimized bias current and the parameters of the input pulse train (pulse duration, power and repetition rate) are experimentally studied. It is found that the larger input pulse duration, the lower input pulse power or the higher repetition rate can lead to a larger SOA optimized bias current, which corresponds to a larger optimized SOA gain. The effects of assist light injection and different amplifier temperatures on the SOA optimized bias current are studied and it is found that assist light injection can effectively increase the SOA optimized bias current while SOA has the lower optimized bias current at the temperature 20°C than that at other temperatures.

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Coherent control in a semiconductor optical amplifier operating at room temperature

Cited by 20 publications

References 31 publications

Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film

Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film

Breakthroughs in Photonics 2014: Time-Scale-Dependent Nonlinear Dynamics in InAs/InP Quantum Dot Gain Media: From High-Speed Modulation to Coherent Light–Matter Interactions

High-speed pulse train amplification in semiconductor optical amplifiers with optimized bias current

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