We use a detailed numerical model of stimulated thermal Rayleigh scattering to compute mode instability thresholds in Tm(3+)-doped fiber amplifiers. The fiber amplifies 2040 nm light using a 790 nm pump. The cross-relaxation process is strong, permitting power efficiencies of 60%. The predicted instability thresholds are compared with those in similar Yb(3+)-doped fiber amplifiers with 976 nm p...

We demonstrate an enhanced multiwavelength L-band Brillouin-erbium fiber laser (BEFL), in which the Brillouin pump is pre-amplified before entering the single-mode fiber. The Brillouin pump pre-amplification provided by the Erbium-doped fiber has created higher intensity of Brillouin Stokes line generated in the single-mode fiber that leads to the homogenous gain saturation. Thus the built-up o...

ةـصلاخلا : ةلاحلا رايعم ثحبلا اذه يف ضرعن – ةلاحلا حشرمُــل لماشلا يبراقتلا تابثلل غارفلا – يمقرلا غارفلا عبشملا يباسحلا ضئافلا مادختساب كلذو ةددحم ةميق اذ . دقو ماظنلل ةديدج ةيصاخ ءاصقتساب رايعملا قُـتشأ ةساردلا ديق . اس رايعم عم رايعملا اذه ةنراقمب انمق امآ جنيسو راآ نم لٍآ لَـبـقِ نم هضرع مت قب . دقو جنيسو راآ رايعم نم لقأ طباوض يذ يلاحلا رايعملا نأ ةنراقملا تنابأ . و نع حرتقملا رايعملا ةعاجن ان...

ÐThe performance analysis of dynamic routing algorithms in interconnection networks of parallel computers has thus far predominantly been done by simulation studies. A limitation of simulation studies is that they usually only hold for specific combinations of network, routing algorithm, and traffic pattern. In this paper, we derive saturation point results for the class of homogeneous traffic ...

As in bulk amplifiers, the onset of nonlinear effects when amplifying ultra-short pulses in fiber amplifiers has been pointed out and investigated by several groups, specifically in erbium-doped fiber amplifiers ( EDFAs) [ l-3 1. Researchers have in fact used the Kerr nonlinearity in conjunction with group velocity dispersion in order to create even shorter pulses via higher-order soliton forma...

Synapses that reliably activate their postsynaptic targets typically release neurotransmitter with high probability, are not very sensitive to changes in calcium entry, and depress. We have determined the mechanisms that give rise to these characteristic features at the climbing fiber to Purkinje cell synapse. We find that saturation of presynaptic calcium entry, of presynaptic release, and of ...

We report on an accurate closed-form analytical model for the gain of a Brillouin fiber amplifier that accounts for material loss in the depleted pump regime. We determined the operational model limits with respect to its relevant parameters and pump regimes through both numerical and experimental validation. As such, our results enable accurate performance prediction of Brillouin fiber amplifi...

Properties of dissipative solitons generated in all-normal-dispersion fiber lasers through the gain dispersion effect are numerically studied by using a pulse-tracing technique that considers interaction between gain saturation, gain dispersion, cavity dispersion, fiber Kerr nonlinearity, and cavity boundary conditions. The numerical results qualitatively match with experimental observations an...

• Understand the principle of operation of the erbium-doped fiber amplifier (EDFA). • Construct an EDFA and an erbium-doped fiber laser. • Measure and calculate the essential parameters of the constructed EDFA. The basic theories on optical amplification by erbium-doped fibers are presented in this section as preparation for the discussions on noise characteristics and noise reduction methods p...