2022/04/11 by Yanli Zhang, Zhang, Yanli, Shanshan Wang +5
Computer Science · Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Applied Physics (physics.app-ph) #Computer science #FOS: Electrical engineering #FOS: Physical sciences #Fiber laser #Laser #Laser linewidth #Materials science #Multi-mode optical fiber #Optical Coherence Tomography Applications #Optical fiber #Optics #Optics (physics.optics) #Optoelectronics #Photonic Crystal and Fiber Optics #Physics #Systems and Control (eess.SY) #cs.SY #eess.SY #electronic engineering #information engineering #physics.app-ph #physics.optics
paper · pdf · doi:10.48550/arxiv.2204.05146
10 pages,6 figures
arxiv created 2022/04/11 · openalex publication_date 2022/04/11 · arxiv updated 2022/04/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The combinations of artificial intelligence and lasers provide powerful ways to form smart light sources with ground-breaking functions. Here, a Raman fiber laser (RFL) with reconfigurable and programmable spectra in an ultra-wide bandwidth is developed based on spectral-spatial manipulation of light in multimode fiber (MMF). The proposed fiber laser uses nonlinear gain from cascaded stimulated Raman scattering, random distributed feedback from Rayleigh scattering, and point feedback from an MMF-based smart spectral filter. Through wavefront shaping controlled by a genetic algorithm, light of selective wavelength(s) can be focused in the MMF, forming the filter that, together with the active part of the laser, actively shape the output spectrum with a high degree of freedom. We achieved arbitrary spectral shaping of the cascaded RFL (e.g., continuously tunable single-wavelength and multi-wavelength laser with customizable linewidth, mode separation, and power distribution) from the 1st- to the 3rd-order Stokes emission by adjusting the pump power and auto-optimization of the smart filter. Our research uses artificial-intelligence controlled light manipulation in a fiber platform with multi-eigenmodes and nonlinear gain, mapping the spatial control into the spectral domain as well as extending the linear control of light in MMF to active light emission, which is of great significance for applications in optical communication, sensing, and spectroscopy.