摘要
Based on the general mechanism of the coherent population oscillations, we propose the fundamental harmonic fractional delay （FHFD） to evaluate the superluminal and slow light propagation in semiconductor optical amplifier （SOA）. The sinusoidal and square-wave signals in SOA are investigated with the propagation equations. It is shown that the superlnminal and slow light always accompany the signal distortion, and FHFD depends on the signal distortion as well as the incident power, the modulation frequency, and the optical gain.
Based on the general mechanism of the coherent population oscillations, we propose the fundamental harmonic fractional delay （FHFD） to evaluate the superluminal and slow light propagation in semiconductor optical amplifier （SOA）. The sinusoidal and square-wave signals in SOA are investigated with the propagation equations. It is shown that the superlnminal and slow light always accompany the signal distortion, and FHFD depends on the signal distortion as well as the incident power, the modulation frequency, and the optical gain.
基金
This work was partly supported by the National Natural Science Foundation of China （Nos. 61275075 and 11274037）, the Natural Science Foundation of Beijing （Nos. 4112042 and 4132035）, the Specialized Research Fund for the Doctoral Program of Higher Education （No. 20120009110032）, and the Beijing Jiaotong University （No. 2012JBM103）.
