Influence of Nonlinear Gain and Nonradiative Recombination on the Quantum Noise in InGaAsP Semiconductor Lasers

Abdulrhmann, Salah; Ahmed, Moustafa; Yamada, Minoru

doi:10.1007/s10043-002-0260-4

Cited by 14 publications

(18 citation statements)

References 25 publications

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“…The term BS measures the gain suppression which affects the damping rate of the relaxation oscillation. 27 The direct digital modulation is included in the current term I͑t͒, which represents the stream of coded bits of the modulating electrical signal:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…In this case of above-threshold biasing, the oscillations are characterized by high damping rate as predicted by the small-signal analysis. 27,28 The relaxation oscillation is associated with the inferior property of turn-on time delay which induces errors in identifying the logic state of the bit. This effect is significant when B = 10 Gbits/ s compared with the case of B = 2.5 Gbits/ s; TOJ is 4.73 ps for the former and 2.58 ps for the latter.…”

Section: A Eye Diagrammentioning

confidence: 99%

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Analysis of semiconductor laser dynamics under gigabit rate modulation

Ahmed

Yamada

Mahmoud

2007

Journal of Applied Physics

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A theoretical study of the dynamics of semiconductor lasers subjected to pseudorandom digital modulation at gigabit rates is presented. The eye diagram, turn-on jitter ͑TOJ͒, and power fluctuations in the modulated laser wave form are analyzed. The study is based on numerical large-signal analysis of the laser rate equations. Influences of the biasing and modulation currents on the eye diagram and TOJ are examined. The degree of eye opening is measured in terms of a Q factor of the laser signal analogous to the Q factor determining the bit-error rate in transmission systems. Influence of optimizing both the sampling and decision times on the signal Q factor is modeled. We show that the most eye opening corresponds to shortening the sampling time associated with lengthening the decision time. We also assess the relative contributions of the laser intrinsic noise and pseudorandom bit pattern to the TOJ. The results show that the bit pattern is the major contributor to the TOJ when the setting time of the relaxation oscillation is longer than the bit slot.

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Section: Theoretical Modelmentioning

confidence: 99%

Section: A Eye Diagrammentioning

confidence: 99%

Analysis of semiconductor laser dynamics under gigabit rate modulation

Ahmed

Yamada

Mahmoud

2007

Journal of Applied Physics

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“…14 The last terms F S ͑t͒ and F N ͑t͒ in Eqs. ͑1͒ and ͑2͒ are Langevin noise sources and are added to the equations to describe the intrinsic fluctuations in S͑t͒ and N͑t͒ associated with quantum transitions of electrons between the valence and conduction bands.…”

Section: A Laser Rate Equationsmentioning

confidence: 99%

Effect of intensity noise of semiconductor lasers on the digital modulation characteristics and the bit error rate of optical communication systems

Ahmed

Yamada

2008

Journal of Applied Physics

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This paper presents theoretical evaluation of the digital modulation performance of semiconductor lasers in digital communication systems with gigabit rates. The study is based on numerical integration of the rate equations augmented by a nonreturn-to-zero ͑NRZ͒ bit generator. For solitary semiconductor lasers, the performance is evaluated in terms of the eye diagram, turn-on delay jitter ͑TOJ͒, and signal-to-noise ratio. In communication systems, the performance is evaluated by the bit error rate ͑BER͒ and power penalty induced by the laser noise. Contributions of both the intrinsic fluctuations and bit pattern to the TOJ and BER are assessed. The results show that when the modulation current is low and the semiconductor laser is biased relatively above threshold, the power penalty decreases although the eye diagram is not well open. When the modulation current is high enough, biasing the semiconductor laser far-above threshold achieves both lower power penalty and higher eye-diagram quality.

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“…[T]. The terms F S (t), F (t) and F N (t) are Langevin noise sources and are added to the rate equations to account for the intrinsic fluctuations in S, and N. The procedures of generating the noise sources are described in [10].…”

Section: Theoretical Modelmentioning

confidence: 99%

“…However, the dynamic characteristics and noise of SLs are influenced by the nonlinear gain (NLG), "which is the origin of many complicated nonlinear phenomena, such as mode competition phenomena, feedback noise, and gain suppression" [4][5][6], and the nonradiative recombination lifetime nr (NRRLT) parameter, "which has strong effect on the carrier life time, threshold current, spontaneous emission factor, output saturation and turn-on time delay" [7][8][9]. So, a good understanding of the influence of the NLG and NRRLTR on the dynamics and [10], and on the operations and rout to chaos with OFB in [11,12]. In this article, we aimed to study numerically and statistically the effects of NLG and NRRLTR at rout to chaos region on the dynamics stability of the SLs.…”

Section: Introductionmentioning

confidence: 99%

Variations of operations and noise of semiconductor lasers subject to optical feedback with nonlinear gain and nonradiative recombination

Abdulrhmann¹,

Al-Hossain²

2015

AIP Conference Proceedings

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Abstract. Influence of the nonlinear gain (NLG) and nonradiative recombination life time ratio (NRRLTR) on the rout to chaos and noise characteristics of semiconductor lasers (SLs) subject to optical feedback (OFB) are investigated. The analyses are performed in terms of the temporal trajectory of the photon numbers, bifurcation diagrams and relative intensity noise (RIN). Variations of the fluctuations of the photon number are statistically analyzed. The corresponding frequency dependence of RIN is characterized. The simulation results show that, NLG and NRRLTR can cause significant changes in the rout to chaos of the SLs and probability distribution of the photon numbers. We found that the value of the OFB rate at which the transition from CW to periodic oscillation (PO) or chaos state occur increases, as the value of the NLG/ NRRLTR is increased/decreased. The RIN is found to be suppressed when the laser is operated in CW or PO region and at relatively higher/lower values of the NLG/NRRLTR. We believe that, the instability of the SLs can be reduced by operating it under OFB and by increasing/decreasing the values of the NLG/NRRLTR parameter.

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Influence of Nonlinear Gain and Nonradiative Recombination on the Quantum Noise in InGaAsP Semiconductor Lasers

Cited by 14 publications

References 25 publications

Analysis of semiconductor laser dynamics under gigabit rate modulation

Analysis of semiconductor laser dynamics under gigabit rate modulation

Effect of intensity noise of semiconductor lasers on the digital modulation characteristics and the bit error rate of optical communication systems

Variations of operations and noise of semiconductor lasers subject to optical feedback with nonlinear gain and nonradiative recombination

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