Stable-unstable switching dynamics in semiconductor lasers with external cavities

Dong, Jia-Xin; Ruan, Jingya; Zhang, Luan; Zhuang, Jun-Ping; Chan, Sze-Chun

doi:10.1103/physreva.103.053524

Cited by 8 publications

(3 citation statements)

References 72 publications

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“…is the nonlinear carrier relaxation rate, 𝐽𝐽 ̃ is the normalized bias current above the threshold, and b is the linewidth enhancement factor. The parameters are extracted from a commercial communication laser [28][29][30]: γc = 5.36×10 11 s −1 , γs = 5.96×10 9 s −1 , γn = 7.53×10 9 s −1 , γp = 1.91×10 10 s −1 , J ̃ = 1.222, and b = 3.2. Second-order Runge-Kutta integration is conducted on Eqs.…”

Section: Chaos Generation and Detectionmentioning

confidence: 99%

Coherent approaches on chaotic semiconductor lasers for dimensional enhancement

Ruan,

Zhang,

Chan

2024

Semiconductor Lasers and Laser Dynamics XI

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Chaotic dynamics in semiconductor lasers under feedback is useful for ranging, security, reinforcement learning, and random bit generation. Complementing temporal characterizations, geometric characterization is realized using the correlation dimension D2. Numerically, a coherent combination of injection and feedback on a laser is considered in showing dimensional enhancement that qualitatively agrees with recent experiments. Experimentally, measurements of the dimensions continue to show enhancement in complexity by coherently incorporating injection and feedback without fixing the phase. The measurements are enabled by employing a large data size, while re-embedding through including a principal component analysis (PCA) is considered. Also, balanced homodyning with a delay is considered on a laser under injection alone, where the estimated dimension is found to nearly double as the baseband is strengthened. Based on singlemode laser dynamics, the coherent approaches of continuous-wave injection, delayed feedback, and balanced homodyning are demonstrated for manipulating the chaotic complexity for applications.

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Section: Chaos Generation and Detectionmentioning

confidence: 99%

Coherent approaches on chaotic semiconductor lasers for dimensional enhancement

Ruan,

Zhang,

Chan

2024

Semiconductor Lasers and Laser Dynamics XI

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“…The Hopf-bifurcation boundary between the stable state and the period-one state was demonstrated in red color in Figure 2, indicating a fluctuation feature; when L was in a short-cavity region, the short-cavity region corresponded to the Hopf-bifurcation boundary with obvious fluctuation (e.g., L < 0.9 m). However, with the increase of L, the fluctuation of the Hopf-bifurcation boundary was gradually stabilized [12,[28][29][30] and tended to a constant feedback strength (e.g., κ c = 0.0011 for current system parameter settings) when L was larger than the critical external cavity length denoted by L c (e.g., 0.9 m shown in Figure 2). We, hence, set the switching status for this SLOF with L larger than L c , and κ near the Hopf-bifurcation boundary as the system operating condition.…”

Section: A Semiconductor Laser With Optical Feedback (Slof) At a Switching Statusmentioning

confidence: 99%

Achieving Long Distance Sensing Using Semiconductor Laser with Optical Feedback by Operating at Switching Status

Nie

Ruan

et al. 2022

Sensors

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In this study, a novel distance sensing method is presented by using a semiconductor laser (SL) with optical feedback (OF) and operating the SL at a switching status happened between two nonlinear dynamic states (stable state and period-one state). In this case, without the need for any electronic or optical modulation devices, the laser intensity can be modulated in a square wave form due to the switching via utilizing the inherent SL dynamics. The periodicity in the switching enables us to develop a new approach for long-distance sensing compared to other SL with OF-based distance measurement systems and lift the relevant restrictions that existed in the systems. Moreover, the impact of system controllable parameters on the duty cycle of the square wave signals generated was investigated on how to maintain the proposed system robustly operating at the switching status. Both simulation and experiment verified the proposed sensing approach.

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“…The region magnified in the inset allows the identification of oscillations of constant frequency f RO that characterize the oscillatory region and a sharp transition to the stable regime. The coexistence of stable and unstable dynamics is a common feature of SL with low optical feedback [43,45,46].…”

Section: Low Feedback Ratementioning

confidence: 99%

Nonlinear Dynamics of a Single-Mode Semiconductor Laser with Long Delayed Optical Feedback: A Modern Experimental Characterization Approach

et al. 2022

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Semiconductor lasers can exhibit complex dynamical behavior in the presence of external perturbations. Delayed optical feedback, re-injecting part of the emitted light back into the laser cavity, in particular, can destabilize the laser’s emission. We focus on the emission properties of a semiconductor laser subject to such optical feedback, where the delay of the light re-injection is large compared to the relaxation oscillations period. We present an overview of the main dynamical features that emerge in semiconductor lasers subject to delayed optical feedback, emphasizing how to experimentally characterize these features using intensity and high-resolution optical spectra measurements. The characterization of the system requires the experimentalist to be able to simultaneously measure multiple time scales that can be up to six orders of magnitude apart, from the picosecond to the microsecond range. We highlight some experimental observations that are particularly interesting from the fundamental point of view and, moreover, provide opportunities for future photonic applications.

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Stable-unstable switching dynamics in semiconductor lasers with external cavities

Cited by 8 publications

References 72 publications

Coherent approaches on chaotic semiconductor lasers for dimensional enhancement

Coherent approaches on chaotic semiconductor lasers for dimensional enhancement

Achieving Long Distance Sensing Using Semiconductor Laser with Optical Feedback by Operating at Switching Status

Nonlinear Dynamics of a Single-Mode Semiconductor Laser with Long Delayed Optical Feedback: A Modern Experimental Characterization Approach

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