2019
DOI: 10.1016/j.optlastec.2018.08.057
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Time-delay signature concealed broadband gain-coupled chaotic laser with fiber random grating induced distributed feedback

Abstract: A broadband chaotic laser with a flat power spectrum extending up to 8.5GHz is achieved by injecting continuous wave laser light into a chaotic diode laser perturbed by fiber random grating induced distributed feedback, which forms a gain-coupled chaotic laser system. More than triple bandwidth enhancement is realized with appropriate frequency detuning between the master and slave lasers. Unlike normal chaotic lasers, the output from such a broadband chaotic laser is free from time-delay signature, which can … Show more

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Cited by 16 publications
(11 citation statements)
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“…The coupling between the feedback light of the fiber random grating, the injected light of the master laser, and the original light of the slave laser leads to the bandwidth broadening of the chaotic laser. Random distributed feedback from a large number of scattering centers along the length of the grating significantly increases the complexity of the external feedback cavity modes, 89 resulting in complete suppression of the TDS of chaotic signals. The difference between this method and that in Ref 77 is the single‐mode fiber is replaced with a fiber random grating, which has a smaller size and is easily for package and integration.…”
Section: The Performance Improvement Of Chaotic Lasermentioning
confidence: 99%
“…The coupling between the feedback light of the fiber random grating, the injected light of the master laser, and the original light of the slave laser leads to the bandwidth broadening of the chaotic laser. Random distributed feedback from a large number of scattering centers along the length of the grating significantly increases the complexity of the external feedback cavity modes, 89 resulting in complete suppression of the TDS of chaotic signals. The difference between this method and that in Ref 77 is the single‐mode fiber is replaced with a fiber random grating, which has a smaller size and is easily for package and integration.…”
Section: The Performance Improvement Of Chaotic Lasermentioning
confidence: 99%
“…in recent years, many methods have been proposed to improve the chaotic signal bandwidth and reduce TDS, such as, the wideband flat chaotic signal is obtained by asymmetric dual-channel feedback 8 , parallel low-delay broadband chaotic signals are obtained by injecting a continuous wave laser into a self-phase modulated external cavity laser 9 . the delay interference self-phase modulated optical feedback is used to improve the chaotic signal bandwidth 10 , the dispersion effect of optical fiber is used to suppress the time delay [11][12][13][14] and the mode selection effect of the grating is used to achieve the purpose of suppressing the time delay [15][16][17] In this paper, we proposed and experimentally verified a multi-channel chaotic signal generation scheme based on a weak resonator cavity Fabry-Perot laser diode (WRC-FPLD), the self-phase modulation is introduced into the feedback loop of WRC-FPLD, and the multi-channel chaotic signals are obtained by adjusting the optical feedback power. The optical feedback scheme based on self-phase modulation optical feedback (SPMOF) scheme is also compared with the conventional optical feedback (COF) scheme, and the experimental results are surface the chaotic signal based on SPMOF scheme has larger bandwidth and lower TDS.…”
Section: Introductionmentioning
confidence: 99%
“…In these applications, more chaotic oscillation can contribute to increasing the performance, for example, randomness in random bit generation, a high bit rate in security in chaotic communication. Various methods of generating chaotic oscillation with a broad bandwidth and large chaotic property have been studied, for example, using a master-slave LD system with frequency detuning [20,21], an external feedback system with dual feedback [22], or an external feedback system with random feedback [23].…”
Section: Introductionmentioning
confidence: 99%