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In this paper, we investigate the enhancement of Raman amplification bandwidth in silicon based photonic crystal waveguides with self-phase modulation (SPM) effect. The Maxwell equations are solved using finite difference time domain method considering two photon absorption, free carrier absorption, Kerr and SPM effects. We also studied the effects of shape, width and average power on the Raman amplification...
We demonstrate theoretically and numerically a novel method of enhancing the bandwidth of a chaotic carrier from a multi-quantum-well laser transmitter using self-phase modulation (SPM) effect in an optical fiber round path. It is deduced theoretically that the nonlinear phase shift arisen from SPM effect has an impact on the gain and bandwidth enhancement factor of the laser. The second order nonlinear...
In this work we present a new method for peak-power scaling in nonlinear CPA-systems. In conventional CPA systems temporal stretching is used to avoid high peak powers developing during the amplification process. However, if the peak power of the stretched pulse is high enough, a considerable amount of nonlinear spectral phase shift (as described by the B-integral) can be accumulated due to self-phase...
We develop a comprehensive theoretical description of passive mode-locked semiconductor lasers based on a coarse grained time-domain approach. Under the approximation of intraband quasi equilibrium, our model accounts for the dispersion of gain, absorption and refractive index, nonlinear gain saturation from ultrafast processes, self-phase modulation, and spontaneous emission noise. We compare the...
In this paper, we present a novel fiber laser system operating at 980 nm that overcomes the limitations related to three-level operation of Yb-doped fiber amplifiers to produce femtosecond pulses. The system is composed of a mode-locked fiber laser producing 4.7 ps at 20 MHz. The pulses then are successively amplified in a polarization-maintained core-pumped fiber amplifier followed by a cladding...
Self phase modulation in hollow waveguide filled with noble gases have been successfully used to produce ultra-broad bandwidths. The intense spectral phase distortions produced by self phase modulation have previously been compensated by prism pairs and adaptive pulse shaping. Here we demonstrate the generation of 4.8 fs, 200 muJ intense laser pulses by multiphoton intrapulse interference phase scan...
In high power optical channels self phase modulation (SPM) imposes spectral broadening distortions. Consequently, ldquoover samplingrdquo beyond the bitrate is proposed according to Nyquist theorem. Here received signal ldquoover samplingrdquo together with maximum likelihood sequence equalizer is demonstrated, indicating of significant enhancement of inter-symbol-interference mitigation in highly...
Spectral shaping in a fiber amplifier with finite gain bandwidth (DeltalambdaFWHM~15nm) and strong self-phase-modulation (PhiNL~12pi) is studied numerically and experimentally. Pulses amplified to 30 muJ energy are dechirped to 250 fs duration.
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