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FRET-Assisted Cascaded Multi-Window Random Laser for Physical Random Bit Generation

Zhijia Hu, Ninghe Han, Xiaolong Ban, Yulin Chen, Dong Tan, Zijun Cheng, Jiangying Xia

Published Jan 1, 2026• 0 citations
Publisher
DOI
10.2139/ssrn.7556985

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Fȍrster resonance energy transfer (FRET) is a fundamental approach for fabricating widely tunable (≥100 nm) random lasers and cascaded ones, which are the fundamental direction for achieving applications breakthroughs of random lasers in multi-fields, such as speckle-free imaging and biosensing. However, it is challenging to realize due to a lack of method to investigate the emission mechanism and emission characteristics of FRET-assisted random laser. In this work, the replica symmetry breaking and the Lévy flight are introduced to investigate the dynamical emission mechanism of FRET-assisted random laser. It is revealed that FRET can induce the disorder in random laser to frustrate coherently oscillating modes, resulting in a non-trivial interaction between the modes, which generates discrete emission field. This emission field exhibits low spatiotemporal coherence, which is essential for using random laser in super-resolution spectroscopy and even photolithography. Meanwhile, the phase diagram of dynamics during the FRET is derived to reveal the dynamical evolution of the interaction between random laser modes during FRET, which illustrates how FRET influences the emissions properties of random laser. This work broadens not only the approach for exploring order physical principles in disorder random laser based on statistical analysis methods, but also provides the theoretical support for the design of complex energy level random lasers with special application properties.
Abstract Correlations existing among spectral components in multi‐wavelength lasers have remained a fundamental constraint impeding their development as chaotic comb entropy sources for parallel random bit generation. Herein, spectrotemporally uncorrelated multi‐order Stokes/anti‐Stokes emissions are achieved by exploiting cascaded stimulated Brillouin scattering and quasi‐phase‐matched four‐wave mixing in a random fiber laser. The proposed configuration introduces random instabilities arising from random mode resonance while enabling disordered energy redistribution across different lasing lines, which thereby effectively eliminates the inherent correlation between multiple Stokes/anti‐Stokes emission lines, realizing a spectrotemporally uncorrelated chaotic frequency comb. Parallel fast random bit generation is fulfilled using 31 channels, with a single‐channel bit rate of 35‐Gbps and a total bit rate of 1.085‐Tbps. This work, in a simple and efficient way, breaks the spectrotemporally correlation barrier for utilizing a multi‐wavelength laser to achieve a high‐quality chaotic laser source, opening new avenues for achieving greatly accelerated random bit generation through parallelization and offering potential benefits for future developments in secure communication and high‐performance computing systems.
Correlations existing between spectral components in multi-wavelength lasers have been the key challenge that hinders these laser sources from being developed to chaotic comb entropy sources for parallel random bit generation. Herein, spectrotemporally uncorrelated multi-order Stokes/anti-Stokes emissions are achieved by cooperatively exploiting nonlinear optical processes including cascaded stimulated Brillouin scattering and quasi-phase-matched four-wave mixing in a Brillouin random fiber laser. Chaotic instabilities induced by random mode resonance are enhanced and disorderly redistributed among different lasing lines through complex nonlinear optical interactions, which comprehensively releases the inherent correlation among multiple Stokes/anti-Stokes emission lines, realizing a chaotic frequency comb with multiple spectrotemporally uncorrelated channels. Parallel fast random bit generation is fulfilled with 31 channels, single-channel bit rate of 35-Gbps and total bit rate of 1.085-Tbps. National Institute of Standards and Technology statistic tests verify the randomness of generated bit streams. This work, in a simple and efficient way, breaks the correlation barrier for utilizing multi-wavelength laser to achieve high-quality spectrotemporally uncorrelated chaotic laser source, opening new avenues for achieving greatly accelerated random bit generation through parallelization and potentially revolutionizing the current architecture of secure communication and high-performance computation.