scholarly journals Microring resonators with external optical feedback for time delay reservoir computing

2021 ◽  
Author(s):  
Giovanni Donati ◽  
Claudio Mirasso ◽  
Mattia Mancinelli ◽  
Lorenzo Pavesi ◽  
Apostolos Argyris
Keyword(s):  
Time Delay ◽  
Optical Feedback ◽  
Microring Resonators ◽  
Reservoir Computing

scholarly journals Fast physical repetitive patterns generation for masking in time-delay reservoir computing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Apostolos Argyris ◽  
Janek Schwind ◽  
Ingo Fischer
Keyword(s):  
Time Delay ◽  
Optical Feedback ◽  
Time Series Prediction ◽  
Computing System ◽  
Performance Comparison ◽  
Operating Conditions ◽  
Periodic Signal ◽  
Reservoir Computing ◽  
Temporal Masking ◽  
Fast Processing

AbstractAlbeit the conceptual simplicity of hardware reservoir computing, the various implementation schemes that have been proposed so far still face versatile challenges. The conceptually simplest implementation uses a time delay approach, where one replaces the ensemble of nonlinear nodes with a unique nonlinear node connected to a delayed feedback loop. This simplification comes at a price in other parts of the implementation; repetitive temporal masking sequences are required to map the input information onto the diverse states of the time delay reservoir. These sequences are commonly introduced by arbitrary waveform generators which is an expensive approach when exploring ultra-fast processing speeds. Here we propose the physical generation of clock-free, sub-nanosecond repetitive patterns, with increased intra-pattern diversity and their use as masking sequences. To that end, we investigate numerically a semiconductor laser with a short optical feedback cavity, a well-studied dynamical system that provides a wide diversity of emitted signals. We focus on those operating conditions that lead to a periodic signal generation, with multiple harmonic frequency tones and sub-nanosecond limit cycle dynamics. By tuning the strength of the different frequency tones in the microwave domain, we access a variety of repetitive patterns and sample them in order to obtain the desired masking sequences. Eventually, we apply them in a time delay reservoir computing approach and test them in a nonlinear time-series prediction task. In a performance comparison with masking sequences that originate from random values, we find that only minor compromises are made while significantly reducing the instrumentation requirements of the time delay reservoir computing system.

scholarly journals Chaotic Time-Delay Signature Suppression and Entropy Growth Enhancement Using Frequency-Band Extractor

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 516
Author(s):  
Yanqiang Guo ◽  
Tong Liu ◽  
Tong Zhao ◽  
Haojie Zhang ◽  
Xiaomin Guo
Keyword(s):  
Time Delay ◽  
Frequency Band ◽  
Secure Communication ◽  
Optical Feedback ◽  
Random Number Generation ◽  
Permutation Entropy ◽  
Growth Enhancement ◽  
Dynamical Process ◽  
Promising Tool ◽  
Entropy Growth

By frequency-band extracting, we experimentally and theoretically investigate time-delay signature (TDS) suppression and entropy growth enhancement of a chaotic optical-feedback semiconductor laser under different injection currents and feedback strengths. The TDS and entropy growth are quantified by the peak value of autocorrelation function and the difference of permutation entropy at the feedback delay time. At the optimal extracting bandwidth, the measured TDS is suppressed up to 96% compared to the original chaos, and the entropy growth is higher than the noise-dominated threshold, indicating that the dynamical process is noisy. The effects of extracting bandwidth and radio frequencies on the TDS and entropy growth are also clarified experimentally and theoretically. The experimental results are in good agreements with the theoretical results. The skewness of the laser intensity distribution is effectively improved to 0.001 with the optimal extracting bandwidth. This technique provides a promising tool to extract randomness and prepare desired entropy sources for chaotic secure communication and random number generation.

scholarly journals Reservoir computing with a single time-delay autonomous Boolean node

2015 ◽  
Vol 91 (2) ◽  
Author(s):  
Nicholas D. Haynes ◽  
Miguel C. Soriano ◽  
David P. Rosin ◽  
Ingo Fischer ◽  
Daniel J. Gauthier
Keyword(s):  
Time Delay ◽  
Reservoir Computing ◽  
Single Time

Multi-target ranging using optical reservoir computing approach in the laterally coupled semiconductor lasers with self-feedback

2021 ◽  
Author(s):  
Dong-Zhou Zhong ◽  
Zhe Xu ◽  
Ya-Lan Hu ◽  
Ke-Ke Zhao ◽  
Jin-Bo Zhang ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
Hilbert Transform ◽  
Optical Feedback ◽  
Optical Injection ◽  
Reservoir Computing ◽  
Probe Signal ◽  
Laser Array ◽  
Target Ranging ◽  
Relative Errors ◽  
Computing Approach

Abstract In this work, we utilize three parallel reservoir computers using semiconductor lasers with optical feedback and light injection to model radar probe signals with delays. Three radar probe signals are generated by driving lasers constructed by a three-element lase array with self-feedback. The response lasers are implemented also by a three-element lase array with both delay-time feedback and optical injection, which are utilized as nonlinear nodes to realize the reservoirs. We show that each delayed radar probe signal can well be predicted and to synchronize with its corresponding trained reservoir, even when there exist parameter mismatches between the response laser array and the driving laser array. Based on this, the three synchronous probe signals are utilized for ranging to three targets, respectively, using Hilbert transform. It is demonstrated that the relative errors for ranging can be very small and less than 0.6%. Our findings show that optical reservoir computing provides an effective way for applications of target ranging.

The Role of Master Laser with Feedback in Time-Delay Signature Suppression of Semiconductor Laser Subject to Chaotic Optical Injection

2017 ◽  
Vol 27 (11) ◽  
pp. 1750169 ◽  
Author(s):  
Liyue Zhang ◽  
Wei Pan ◽  
Penghua Mu ◽  
Xiaofeng Li ◽  
Shuiying Xiang ◽  
...  
Keyword(s):  
Time Delay ◽  
Semiconductor Laser ◽  
Optical Feedback ◽  
Bias Current ◽  
Optical Injection ◽  
Strength Parameter ◽  
Master Laser ◽  
Feedback Strength ◽  
Chaotic Signals

The important role of parameters in master laser with optical feedback for the elimination of time-delay (TD) signature in semiconductor laser subject to chaotic optical injection is investigated systemically. The experimental results show that TD signature suppressed chaotic signals can be credibly generated by increasing the feedback strength of the master laser, which is quite different from the trends observed in semiconductor laser (SL) with optical feedback. Systematically numerical analysis is also carried out as a validation, and it is shown that with low bias current and strong feedback strength, parameter regions contributing to successful TD suppression are much wider. Furthermore, it is shown that the influence of frequency detuning in TD concealment will change with the increase of feedback strength. All the numerical results are in perfect accordance with experimental observation.

scholarly journals Performance optimization research of reservoir computing system based on an optical feedback semiconductor laser under electrical information injection

2019 ◽  
Vol 27 (14) ◽  
pp. 19931 ◽  
Author(s):  
DianZuo Yue ◽  
ZhengMao Wu ◽  
YuShuang Hou ◽  
Bing Cui ◽  
YanHong Jin ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
Performance Optimization ◽  
Optical Feedback ◽  
Computing System ◽  
Reservoir Computing

Influence of Coupling Conditions on Time Delay Line Characteristics of Integrated Waveguide Microring Resonators

2011 ◽  
Vol 31 (6) ◽  
pp. 0613001
Author(s):  
韩秀友 Han Xiuyou ◽  
张佳宁 Zhang Jianing ◽  
宋红妍 Song Hongyan ◽  
吴彭生 Wu Pengsheng ◽  
王凌华 Wang Linghua ◽  
...  
Keyword(s):  
Time Delay ◽  
Delay Line ◽  
Microring Resonators ◽  
Coupling Conditions

Time-Delay Signature Suppression in Chaotic Laser Source with Optical Feedback by Brillouin Scattering

2017 ◽  
Vol 44 (2) ◽  
pp. 0208002
Author(s):  
张建忠 Zhang Jianzhong ◽  
冯昌坤 Feng Changkun ◽  
张明江 Zhang Mingjiang ◽  
刘 毅 Liu Yi ◽  
张永宁 Zhang Yongning
Keyword(s):  
Time Delay ◽  
Optical Feedback ◽  
Brillouin Scattering ◽  
Laser Source ◽  
Chaotic Laser

Time-delay signature concealment of polarizationresolved chaos outputs in vertical-cavity surface-emitting lasers with variablepolarization filtered optical feedback

2015 ◽  
Vol 13 (9) ◽  
pp. 091401-91405
Author(s):  
Li Zhou Li Zhou ◽  
Guangqiong Xia Guangqiong Xia ◽  
Zhuqiang Zhong Zhuqiang Zhong ◽  
Jiagui Wu Jiagui Wu ◽  
Shuntian Wang Shuntian Wang ◽  
...  
Keyword(s):  
Time Delay ◽  
Optical Feedback ◽  
Cavity Surface ◽  
Surface Emitting Lasers ◽  
Vertical Cavity Surface ◽  
Emitting Lasers ◽  
Vertical Cavity

5. Time delay systems for reservoir computing

2019 ◽  
pp. 117-152
Author(s):  
Silvia Ortín ◽  
Luis Pesquera ◽  
Guy Van der Sande ◽  
Miguel C. Soriano
Keyword(s):  
Time Delay ◽  
Delay Systems ◽  
Reservoir Computing ◽  
Time Delay Systems
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