Phase noise and spectral line shape in semiconductor lasers

Daino, B.; Spanó, P.; Tamburrini, M.; Piazzolla, S.

doi:10.1109/jqe.1983.1071842

Cited by 132 publications

(28 citation statements)

References 10 publications

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“…This parameter is not included in our model since the α-value is negligible in QCLs, which has been confirmed by experiments [19]. In general, if the spectral density of the frequency fluctuation is known, the mean squared value of the phase change can be obtained as [20] ( ) ( ) …”

Section: Noise Spectramentioning

confidence: 86%

Effects of resonant tunneling and dynamics of coherent interaction on intrinsic linewidth of quantum cascade lasers

2012

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A theoretical model for calculation of the intrinsic linewidth of QCLs is built on the basis of the quantum Langevin approach. It differs from the traditional rate equation model in that the resonant tunneling and the dynamics of coherent interaction can be considered. Results show that the coupling strength and the dephasing rate associated with resonant tunneling strongly affect the linewidth of THz QCLs in the incoherent resonant-tunneling transport regime but only induce little influence in the coherent regime. The dynamics of coherent interaction and resonanttunneling transport show insignificant effects on the linewidth calculation of mid-infrared QCLs due to strong coupling in resonant tunneling. We also demonstrate that by properly designing the active regions of QCLs, one can reduce the intrinsic linewidth according to our model.

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Section: Noise Spectramentioning

confidence: 86%

Effects of resonant tunneling and dynamics of coherent interaction on intrinsic linewidth of quantum cascade lasers

2012

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“…These statistics for are valid assuming a Lorentzian line shape, where the power spectral density of the instantaneous laser frequencies, and , are white. This assumption has been experimentally verified for the frequency range of 1 MHz up to the relaxation resonance of the laser, which is typically a few gigahertz [13]. Strictly speaking, the effects of the relaxation resonance on the phaseto-intensity noise should be considered.…”

Section: Statistics Of Random Processesmentioning

confidence: 95%

Phase noise in coherent analog AM-WIRNA optical links

Taylor

Poor

Forrest

1997

J. Lightwave Technol.

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Coherent analog amplitude modulated-wideband rectifier narrowband (AM-WIRNA) systems have been the focus of many recent studies because of their high performance and relative immunity to phase noise compared to angle modulated systems. Despite their natural advantages over angle modulated systems, AM-WIRNA receivers are still vulnerable to phase noise because of distortion of their phase broadened signals in a finite bandwidth system. We present the first numerical analysis of the effects of this distortion on the performance of AM-WIRNA systems. The analysis accurately models the power spectral density of the phase-to-intensity noise with a root-mean-square deviation from the averaged experimental noise spectrum of 1.2 dB and a maximum deviation of 3.8 dB in the modulation range of <2 GHz. The accuracy of the analysis is limited primarily by nonidealities in the AM-WIRNA receiver and the accuracy of the analytical intermediate frequency (IF) filter model. Optimal link designs are presented which minimize the impact of phase-to-distortion noise in AM-WIRNA systems. We present experimental data from AM-WIRNA links which use both external cavity and distributed feedback lasers for the signal and local oscillator sources. The numerical analysis predicts the link signal-to-noise ratio (SNR) for different signal laser powers to within 1.4 dB of experiment. We find that systems requiring high SNR such as phased array antennas and AM-CATV are significantly affected by this noise.

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“…Laser noise has been a research subject for several decades in both laser physics and signal analysis [16][17][18][19]. Laser noise characterization is an important step to analyze noise effects in OCT processes.…”

Section: Laser Noise In Oct Processesmentioning

confidence: 99%