Experimental generations and analyses of chaos-modulated pulses for pulsed chaos lidar applications based on gain-switched semiconductor lasers subject to optical feedback

被引：17

作者：

Chen, Chih-Ying ^{[1
]}

Cheng, Chih-Hao ^{[1
]}

Pan, Da-Kung ^{[1
]}

Lin, Fan-Yi ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Elect Engn, Inst Photon Technol, Hsinchu 30013, Taiwan

来源：

OPTICS EXPRESS | 2018年 / 26卷 / 16期

关键词：

NONLINEAR DYNAMICS; INJECTION; RADAR; RESOLUTION; SCANNERS; TIME;

D O I：

10.1364/OE.26.020851

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We experimentally generate and analyze chaos-modulated pulses for pulsed chaos lidar applications based on gain-switched semiconductor lasers subject to optical feedback. While conventional pulsed lidars emit repetitive short pulses without specificity making them vulnerable to interference and range ambiguity, chaos lidars possess the advantages of no range ambiguity and immune to interference and jamming benefited by the aperiodic and uncorrelated chaos waveforms used. Compared to the cw chaos lidars originally proposed, the pulsed chaos lidars can have significantly higher peak power under the class-1 eye-safe regulation that is essential for long-range low-reflectivity target detection. We investigate the temporal, spectral, and cross-correlation characteristics of the modulated pulses obtained with different feedback strengths and modulation currents. Induced by the transient response and evolving with the delayed feedback, modulated pulses exhibiting periodic oscillations and complex dynamics such as chaos are observed. Under a weakly damped condition with large modulation current and moderate feedback strength, we successfully generate uncorrelated chaos-modulated pulses suitable for the pulsed chaos lidar applications. With the current configuration, for cross-correlations comparable to the benchmark of 0.19 set by the cross-correlation of the intensity fluctuation on the sole gain-switched pulses without feedback, uncorrelated waveforms with durations up to 218 ns in a 500 ns modulated pulse can be effectively utilized. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：20851 / 20860

页数：10

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