ArticleScientific reports2026
Polarization-modulable ASE light source using Bi
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report an all-fiber polarization-modulable amplified spontaneous emission (ASE) light source, enabled by the thermo-optic effect of a Bi2O2S thin film. By coupling a 980 nm laser diode as the control signal and allowing it to interact with linearly polarized ASE light, photon-to-photon modulation is achieved through localized photothermal heating in the Bi2O2S thin film. The induced refractive index variation generates a controllable phase delay between orthogonal polarization components, resulting in continuous rotation of the polarization azimuth degree. Experimental results show a linear polarization tuning behavior, with a maximum azimuth rotation of 28.44° and a rotation efficiency of 0.0825°/mW (R² = 0.9773). Importantly, the ASE spectrum remains unchanged during modulation, confirming stable wavelength operation and purely polarization-based control. The fully fiber-integrated, compact, and alignment-free configuration provides a practical and highly stable platform for implementing tunable polarization control in broadband light sources. This polarization-modulable ASE source offers potential for applications in lidar sensing, optical coherence tomography, coherent detection, and other polarization-sensitive photonic systems.
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