An analytical model for the power spectral density of a voltage-controlled oscillator and its analogy to the laser linewidth theory

1998 ◽  
Vol 45 (9) ◽  
pp. 904-908 ◽  
Author(s):  
F. Herzel
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Analytical Model ◽  
Voltage Controlled Oscillator ◽  
Laser Linewidth ◽  
Power Spectral

scholarly journals Numerical Estimation of Spectral Properties of Laser Based on Rate Equations

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
Jan Litvik ◽  
Michal Kuba ◽  
Daniel Benedikovic ◽  
Jozef Dubovan ◽  
Milan Dado
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Communication Systems ◽  
Spectral Properties ◽  
Optical Power ◽  
Time Dependent ◽  
Rate Equations ◽  
Laser Linewidth ◽  
Power Spectral ◽  
Laser Signal

Laser spectral properties are essential to evaluate the performance of optical communication systems. In general, the power spectral density of the phase noise has a crucial impact on spectral properties of the unmodulated laser signal. Here the white Gaussian noise and1/f-noise are taken into the consideration. By utilizing the time-dependent realizations of the instantaneous optical power and the phase simultaneously, it is possible to estimate the power spectral density or alternatively the power spectrum of an unmodulated laser signal shifted to the baseband and thus estimate the laser linewidth. In this work, we report on the theoretical approach to analyse unmodulated real-valued high-frequency stationary random passband signal of laser, followed by presenting the numerical model of the distributed feedback laser to emulate the time-dependent optical power and the instantaneous phase, as two important time domain laser attributes. The laser model is based on numerical solving the rate equations using fourth-order Runge-Kutta method. This way, we show the direct estimation of the power spectral density and the laser linewidth, when time-dependent laser characteristics are known.

Analytical Model for Guideway Surface Roughness

1976 ◽  
Vol 98 (4) ◽  
pp. 425-431 ◽  
Author(s):  
M. Bala Krishna ◽  
D. A. Hullender
Keyword(s):  
Numerical Simulation ◽  
Surface Roughness ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Analytical Model ◽  
Digital Computer ◽  
Short Wavelength ◽  
Simulation Techniques ◽  
Power Spectral ◽  
Computer Numerical Simulation

An analytical model is presented for calculating the power spectral density of relatively short wavelength guideway irregularities associated with surface roughness. The results are presented in terms of design tolerances which can be interpreted in terms of the familiar California profile index or in terms of measurable deviations from a straight edge. Digital computer numerical simulation techniques are used to verify the model.

Fuzzy Modeling of Multi-Degree-of-Freedom Power Spectral Density Systems

2009 ◽  
Vol 2 (1) ◽  
pp. 40-47
Author(s):  
Montasser Tahat ◽  
Hussien Al-Wedyan ◽  
Kudret Demirli ◽  
Saad Mutasher
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Fuzzy Modeling ◽  
Degree Of Freedom ◽  
Power Spectral
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