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y Chaotic Time-Delay Signature Suppression in a Semiconductor Laser With Frequency-Detuned Grating Feedback
被引:101
作者:
Li, Song-Sui
[1
]
Chan, Sze-Chun
[1
,2
]
机构:
[1] City Univ Hong Kong, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China
[2] City Univ Hong Kong, State Key Lab Millimeter Waves, Hong Kong, Hong Kong, Peoples R China
关键词:
Optical chaos;
time-delay signature;
semiconductor laser;
fiber Bragg grating;
RANDOM BIT GENERATION;
LINEWIDTH ENHANCEMENT FACTOR;
SURFACE-EMITTING LASERS;
PERIOD-ONE OSCILLATIONS;
WIDE-BAND CHAOS;
OPTICAL FEEDBACK;
FILTERED-FEEDBACK;
NONLINEAR DYNAMICS;
SUBJECT;
INJECTION;
D O I:
10.1109/JSTQE.2015.2427521
中图分类号:
TM [电工技术];
TN [电子技术、通信技术];
学科分类号:
0808 ;
0809 ;
摘要:
Chaotic dynamics of a semiconductor laser subject to optical feedback from a frequency-detuned fiber Bragg grating (FBG) is investigated experimentally and numerically. Although the FBG is similar to a mirror in perturbing the laser into chaos, it is not the same as amirror because it provides spatially distributed reflections. Such distributed reflections effectively suppress the undesirable time-delay signature (TDS) contained in the autocorrelation function of the chaotic intensity time-series. The investigation shows that the best suppression of TDS is attained when the FBG is positively detuned from the free-running laser frequency. The TDS suppression is due to dispersion at frequencies near an edge of the main lobe of the FBG reflectivity spectrum. The suppression prefers the FBG at a positive detuning frequency because the laser cavity is red-shifted by the antiguidance effect. Numerically, the dynamical behavior is mapped in the parameter space of detuning frequency and feedback strength, where wide regions of chaos are identified. Experimentally, the TDS suppression by FBG feedback is demonstrated for the first time. The positively detuned FBG suppresses the TDS by over ten times to below 0.04 in the experiments.
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页码:541 / 552
页数:12
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