Mr. Ting-De Liao Profile

Ting-De Liao

at Yuan Ze Univ

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Proceedings Article | 9 May 2018 Paper

Dynamical characteristics of semiconductor laser under both optical and optoelectronic feedback

Shao-Wei Lu, Ting-De Liao, Yu-Shan Juan

Proceedings Volume 10682, 1068225 (2018) https://doi.org/10.1117/12.2307615

KEYWORDS: Optoelectronics, Semiconductor lasers, Feedback loops, Microwave radiation, Laser optics, Nonlinear dynamics, Chaos, Attenuators, Feedback control, Beam splitters

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Nonlinear dynamics of semiconductor lasers under individually optoelectronic feedback (OEF) and optical feedback (OF) is attracted much attention in these two decades. In this paper, nonlinear dynamics of single-mode distributed feedback (DFB) semiconductor laser subject to dual feedback composed of both optical feedback and optoelectronic feedback are investigated experimentally. The dynamical states shown in individual system are observed, quasi-periodic (QP) oscillation and pulsation, regular pulsation (RP), chaotic oscillation (CO) and pulsation (CP). To explore the microwave signals generated by quasi-periodic states in the dual feedback system, we also measure the suppression ratio of unwanted frequency side peak and RF spectral linewidth in frequency domain. On the other hand, the corresponding time series are also considered and discussed by calculating the amplitude variation of regular pulses and pulse widths. Moreover, a side peak suppression ratio of about 56 dB is achieved when applying the hybrid feedback scheme. The amplitude variation ratio of regular pulses is optimized to 0.008 and the pulse-width is approximately 0.12 ns which is smaller than those coefficient when applying individual OF and OEF system. The improved percentage of averaged amplitude variation in regular pulses of around 60 percent is also obtained. Furthermore, the complexity of chaotic waveforms generated by hybrid feedback system are discussed and calculated.

Proceedings Article | 22 February 2017 Paper

Generation of broadband chaos and stabilized regular pulses by quasi-periodic states in dual-feedback system

Ting-De Liao, Yu-Shan Juan

Proceedings Volume 10098, 100981Z (2017) https://doi.org/10.1117/12.2251794

KEYWORDS: Chaos, Nonlinear dynamics, Optoelectronics, Semiconductor lasers, Laser optics, Complex systems, Feedback control, Signal generators, Laser systems engineering, Feedback loops, Microwave radiation, Optical simulations

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Nonlinear dynamics of semiconductor lasers under individually optoelectronic feedback (OEF) and optical feedback (OF) is attracted much attention in these two decades. However, according to my knowledge, there is no related research results in dual-feedback system composed of optical and optoelectronic feedbacks. In this paper, the nonlinear dynamics of the dual-feedback system is studied and applications in generation of broadband chaos and stabilized pulses based on quasi-periodic (QP) states are achieved. Generally, QP states do not have contributed application which limited the research attention in recent years. Here we focused on the QP state and turned it to be the useful chaos and pulses. The QP is firstly generated by pure OEF system and then applying an additional OF system to obtain the chaos and pulses by tuning the controllable conditions of feedback strength and delay time. To explore the rich dynamics of the dual feedback system, mappings of each dynamical states are calculated, including regular pulsing, periodic oscillation, and chaotic oscillation and pulsing states. Furthermore, chaos bandwidth and amplitude variation of regular pulses are examined to quantify the signals generated. A 2-fold improvement of chaotic oscillation frequency is observed in dual feedback system compared to the chaos generated by pure OEF system. Broadband bandwidth of chaotic oscillation is obtained in dual-feedback system when using a relaxation oscillation frequency of 2.5 GHz laser in the free-running condition. Moreover, the improved percentage of averaged amplitude variation in regular pulses is around 81.6% compared to those generated by pure OEF scheme.

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