Abstract
Chaotic Brillouin dynamic gratings (BDGs) have special advantages such as the creation of single, permanent and localized BDG. However, the periodic signals induced by conventional optical feedback (COF) in chaotic semiconductor lasers can lead to the generation of spurious BDGs, which will limit the application of chaotic BDGs. In this paper, filtered optical feedback (FOF) is proposed to eliminate spurious BDGs. By controlling the spectral width of the optical filter and its detuning from the laser frequency, semiconductor lasers with FOF operate in the suppression region of the time-delay signature, and chaotic outputs serving as pump waves are then utilized to generate the chaotic BDG in a polarization maintaining fiber. Through comparative analysis of the COF and FOF schemes, it has been demonstrated that spurious BDGs are effectively eliminated and that the reflection characterization of the chaotic BDG is improved. The influence of FOF on the reflection and gain spectra of the chaotic BDG is analyzed as well.
Highlights
Brillouin dynamic gratings (BDGs) have attracted increasing and extensive attention due to their applications in distributed fiber sensing[1], tunable optical delays[2], all-optical flip-flops[3], all-optical signal processing[4], and high-resolution optical spectrometers[5]
To generate a single BDG in an optical fiber, amplified spontaneous emissions (ASEs) with single correlation peaks can be used as pump waves[23]
The essential cause of the spurious BDG generation is that chaotic light from a semiconductor laser with conventional optical feedback (COF) contains a periodic signal induced by the optical round trip in the external cavity feedback
Summary
Brillouin dynamic gratings (BDGs) have attracted increasing and extensive attention due to their applications in distributed fiber sensing[1], tunable optical delays[2], all-optical flip-flops[3], all-optical signal processing[4], and high-resolution optical spectrometers[5]. The time-delay signature of the output chaos from the semiconductor laser with FOF can be effectively suppressed by adjusting the parameters of the optical filter, i.e., the spectral width Λ of the filter and its detuning Δν from the laser frequency.
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