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<p>The chaotic signal bandwidth (BW) in distributed feedback (DFB) lasers with unidirectional optical injection has been simulated. A slave laser diode (SLD) is subjected to a variable center frequency signal delivered by a single-mode optical fiber from an identical-type master laser diode (MLD). The study confirmed that the resulting broadband chaotic signal fluctuated against selected unidirectional optical injection (OI) strength values. Depending on that and frequency detuning, the BW of the chaotic signal is increased approximately three times more than that observed with the original free-running value in the case of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2509_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="63" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Delta f= 50\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Δ</mi> <mi>f</mi> <mo>=</mo> <mn>50</mn> </mrow> </math></EquationSource> </InlineEquation> GHz, where the maximum resulted BW value is 23.24&#xa0;GHz, which is large enough to upload huge data securely by an appropriate chaotic communication technique.</p>

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Effect of detuning in laser diode chaotic dynamics with unidirectional optical injection

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Hawraa H. Khalaf,
  • Ayser A. Hemed

摘要

The chaotic signal bandwidth (BW) in distributed feedback (DFB) lasers with unidirectional optical injection has been simulated. A slave laser diode (SLD) is subjected to a variable center frequency signal delivered by a single-mode optical fiber from an identical-type master laser diode (MLD). The study confirmed that the resulting broadband chaotic signal fluctuated against selected unidirectional optical injection (OI) strength values. Depending on that and frequency detuning, the BW of the chaotic signal is increased approximately three times more than that observed with the original free-running value in the case of \(\Delta f= 50\) Δ f = 50 GHz, where the maximum resulted BW value is 23.24 GHz, which is large enough to upload huge data securely by an appropriate chaotic communication technique.