A theoretical model for the mode-locked hybrid soliton pulse source (HSPS) is developed by using a time domain solution of coupled-mode equations and rate equations. Numerical simulations show that grating must be both linearly chirped and apodized to be used in HSPS systems with a wide mode-locking frequency range (2.1 to 3 GHz) and transform-limited output pulses.
The intensity modulation (IM) of a hybrid soliton pulse source (HSPS) utilizing linearly chirped Gaussian apodized fiber Bragg grating is described using electric field approach. The HSPS is modeled by a time-domain solution of the coupled-mode equations. It is shown that resonance peak spectral splitting (RPSS) in the IM spectra does not strongly depends on antireflection coated reflectivity, and gain compression factor. It is also found that RPSS disappears by choosing suitable liner chirp rate in Gaussian apodized FBG.
The small signal intensity modulation (IM) of a hybrid soliton pulse source (HSPS) utilizing Gaussian apodized fiber Bragg grating is described using electric field approach. The HSPS is modeled by a time-domain solution of the coupled-mode equations. It is shown that type of external cavity is important effect on resonance peak spectral splitting (RPSS) in IM response as well as effect of laser and fiber Bragg grating (FBG) parameters. The RPSS can be suppressed by using linearly chirped Gaussian apodized FBG as an external cavity insted of Gaussian apodized FBG.
The relative intensity noise (RIN) of hybrid soliton pulse source (HSPS) utilizing different fiber Bragg gratings (FBGs) are described. The HSPS is modeled by a time-domain solution of the coupled-mode equations including spontaneous emission noise, and RIN is calculated using numerical solutions of these equations. RIN reduction up to 4 dB has been demonstrated for the mode-locked HSPS using a suitable window function such as Gaussian apodized and introducing appropriate linear chirp value into gratings.
Intensity noise of mode-locked hybrid soliton pulse source (HSPS) with linearly chirped uniform fiber Bragg grating (FBG) is reported using by coupled-mode equations. Mode-locking is difficult to achieve for some value of rf and dc bias currents because of increasing noise. Hence, transform-limited pulses are not generated over a wide tuning range although these pulses are obtained over a wide tuning range without any noise.
Mode-locked and relative intensity noise (RIN) of hybrid soliton pulse source (HSPS) utilizing Gaussian apodized fiber Bragg grating (with zero dc-index change) is described. The HSPS is modeled by a time-domain solution of the coupled-mode equations including spontaneous emission noise. RIN is calculated using numerical solutions of these equations. It is found that for these gratings soliton type pulse are not generated at the mode-locking frequency. However, these pulses can be generated only at limited tuning range with and without noise. RIN peak does not locate at the fundamental frequency that shows optical resonance due to cavity roundtrip time. Also, obtained soliton pulses are not directly related to magnitude of noise.
The effect of carrier noise on hybrid soliton pulse source (HSPS) is described when it is mode-locked. The model is based on a time domain solution of coupled-mode equations. Relative intensity noise (RIN) is calculated using numerical solution of these equations. It was showed that carrier noise reduces the mode-locking range and near transform limited pulses are not generated because of this noise.
The noise and mode-locking phenomena of a hybrid soliton pulse source (HSPS) utilizing Gaussian apodized fiber Bragg grating is described. The HSPS is modeled by a time-domain solution of the coupled-mode equations including spontaneous emission noise. Relative intensity noise (RIN) is calculated using numerical solutions of these equations. It is found that near transform limited pulses are only generated over a limited frequency range even if system is properly mode-locked over a wide frequency range around the fundamental mode-locking frequency. If transform limited pulses are not obtained at the fundamental frequency, output pulse is not more affected from the noise at this frequency. It is also found that noise reduction is possible by using these gratings.
In this study, different second harmonic distortion (2HD) levels of a 1.55 micrometers , InGaAsP ridge waveguide laser diode are investigated by using a mathematical model based on multi-mode rate equations. The rate equations with an input current i are solved numerically by using fourth order Runge-Kutta algorithm for frequencies ranging from 1 GHz to 10 GHz with 1 GHz steps and the standard parameter values. The important parameters of 1.55 micrometers . InGaAsP semiconductor lasers such as Auger recombination, non- radiative recombination, spontaneous emission lifetime and gain saturation are taken into account. The effects of some parameters on 2HD for different threshold levels are examined and computed graphically.
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