Time-delay signature of chaos in 1550 nm VCSELs with variable-polarization FBG feedback

Li, Yan; Wu, Zheng-Mao; Zhong, Zhuqiang; Yang, Xiaoxia; Mao, Song; Xia, Guang-Qiong

doi:10.1364/oe.22.019610

Cited by 19 publications

(8 citation statements)

References 41 publications

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“…In general, by using the FBG instead of a mirror for feedback, all of the TD signatures presented in Fig. 3 are suppressed [15,28]. Yet, it is desirable to further eliminate the residual TD signatures.…”

Section: Resultsmentioning

confidence: 99%

“…where <•> denotes time-average and Δt is the time-shift. Also, TD information can possibly be revealed by the permutation entropy (PE) [21,28,33,34]. PE is evaluated versus the embedding delay time τ e by the following procedure for each polarization with intensity time series I(t).…”

Section: System Model and Theorymentioning

confidence: 99%

“…We also studied similar TD signature suppression in a chaotic VCSEL that is subject to two feedbacks with variable polarizations [26] or is subject to mutual coupling from another VCSEL [27]. Additionally, we investigated the TD features of a chaotic VCSEL under variable-polarization feedback from a grating [28], but only the total output intensity was considered without resolving the two polarization components (PCs). This was due to the challenge of operating the VCSEL with two co-existing PCs in chaos.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Polarization-resolved time-delay signatures of chaos induced by FBG-feedback in VCSEL

Zhong¹,

Li²,

Chan³

et al. 2015

Opt. Express

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Polarization-resolved chaotic emission intensities from a vertical-cavity surface-emitting laser (VCSEL) subject to feedback from a fiber Bragg grating (FBG) are numerically investigated. Time-delay (TD) signatures of the feedback are examined through various means including self-correlations of intensity time-series of individual polarizations, cross-correlation of intensities time-series between both polarizations, and permutation entropies calculated for the individual polarizations. The results show that the TD signatures can be clearly suppressed by selecting suitable operation parameters such as the feedback strength, FBG bandwidth, and Bragg frequency. Also, in the operational parameter space, numerical maps of TD signatures and effective bandwidths are obtained, which show regions of chaotic signals with both wide bandwidths and weak TD signatures. Finally, by comparing with a VCSEL subject to feedback from a mirror, the VCSEL subject to feedback from the FBG generally shows better concealment of the TD signatures with similar, or even wider, bandwidths.

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Section: Resultsmentioning

confidence: 99%

Section: System Model and Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polarization-resolved time-delay signatures of chaos induced by FBG-feedback in VCSEL

Zhong¹,

Li²,

Chan³

et al. 2015

Opt. Express

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“…Different from conventional reflected mirrors, an FBG can provide distributed feedback along its length, and the group velocity dispersion of FBG can weaken and suppress the TDS. We extended the FBG feedback to VCSELs and theoretically studied the TDS of chaos in VCSELs subject to variable-polarization FBG feedback [20] as well as the polarization-resolved TDS of chaos in an FBG feedback VCSEL (FBGF-VCSEL) [21]. Even so, no experimental investigation on the TDS of chaotic output from an FBGF-VCSEL has been carried on.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the time-delay signature of chaotic output from a 1550 nm VCSEL subject to FBG feedback

Zhong

Xia

2016

Photon. Res.

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The time-delay signature (TDS) of chaos output in a 1550 nm vertical-cavity surface-emitting laser (VCSEL) subject to fiber Bragg grating (FBG) feedback is investigated experimentally. Autocorrelation function (ACF) and mutual information (MI) are used for quantitatively identifying the TDS of chaos. For various bias currents, the TDS evolution with the feedback strength is different, as the FBG provides wavelength-selective feedback. Furthermore, based on the TDS map of the FBG feedback VCSEL (FBGF-VCSEL) in the parameter space of feedback strength and bias current, the optimal TDS suppression regions, where the dominant polarization mode of FBGF-VCSEL locates at the edge of the main lobe of FBG reflection spectrum, have been determined. Finally, for comparative purpose, the TDS of chaos in mirror feedback VCSEL (MF-VCSEL) also has been presented, and the results show that an FBGF-VCSEL possesses better TDS suppression performance than an MF-VCSEL.

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“…These phenomena are often considered as a drawback, degrading the laser performance. At present, they can also be generalized to apply some areas of great concern, such as polarization switch, polarization multiplexing and demultiplexing and optical logic gates devices [11][12][13][14][15][16][17]. It is a very attractive scheme that optical logic devices are designed by means of the PS of an optically injected VCSEL.…”

Section: Introductionmentioning

confidence: 99%

Controllable optoelectric composite logic gates based on the polarization switching in an optically injected VCSEL

Zhong

Luo

2015

Opt. Express

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Based on the polarization switching mechanism in an optically injected vertical cavity surface emitting laser (VCSEL), and the new electro-optic modulation theory, we propose a novel approach to implement optoelectric logic gates. Here, the two linearly polarized lights from the output of the laser are considered as two logic outputs. Under the electro-optic modulation, one of the logic outputs is the NOT operation with the other one. With the same logic input signal, we perform various digital signal processing (AND, OR, XNOR, NAND, NOR and XOR) in the optical domain, controlling the logic operation of the applied electric field between the two logic input signals. On this basis, the logic operation of half-adder is further implemented.

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Time-delay signature of chaos in 1550 nm VCSELs with variable-polarization FBG feedback

Cited by 19 publications

References 41 publications

Polarization-resolved time-delay signatures of chaos induced by FBG-feedback in VCSEL

Polarization-resolved time-delay signatures of chaos induced by FBG-feedback in VCSEL

Experimental investigation on the time-delay signature of chaotic output from a 1550 nm VCSEL subject to FBG feedback

Controllable optoelectric composite logic gates based on the polarization switching in an optically injected VCSEL

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