Numerical modeling of intensity and phase noise in semiconductor lasers

Analysis of semiconductor laser dynamics under gigabit rate modulation

“…The power fluctuations in the 1 level are simultaneously suppressed due to improvement of laser coherency, 3 while those in the 0 level slightly change which then decreases the denominator ͑ 1 + 0 ͒. The net result is an increase of Q signal with the increase of I b as shown in the figure. On the other hand when I b is higher than but near I th , the power P 0 ͑t͒ exhibits relaxation oscillations with enhanced fluctuations, 3 increasing the denominator ͑ 1 + 0 ͒. The powers P 0 and P 1 should increase with the same amount above threshold, however, the enhanced relaxation oscillations of P 0 ͑t͒ may increase average power P 0 within the optimized sampled period T s .…”

“…The intrinsic origins of this noise are inclusion of the spontaneous emission into the lasing mode and processes of electron-hole recombination. 2,3 Moreover, the laser exhibits inferior characteristics during the transient regime, such as time delay of the laser turn on. 4,5 The turn-on delay is defined as the time interval between the onset of the electrical pulse and the resulting optical pulse.…”

Influence of instantaneous mode competition on the dynamics of semiconductor lasers

“…However, these random generations should satisfy the correlation relations (12)- (14) among the noise sources. In previous works [26], [30], the authors proposed a technique to solve this problem and adopt these numerical generations for both cases of single mode and multimode operations. In this subsection, we apply such a technique to the present model.…”

Theoretical analysis of mode-competition noise in modulated laser diodes and its influence on the noise performance of fibre links

“…They are added to the rate equations to account for intrinsic fluctuations of the laser associated with quantum transitions of electrons between the valence and conduction bands [17].…”

“…In the above equations, the property of orthogonality among modes is introduced in terms of the Kronecker delta p,q . The variances of the noise sources V xy (with x and y referring to any of S p or N) are determined as sums of variances of the fluctuating terms in the rate equations [17,18].…”