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Updated: Feb 3, 2026

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
Virtual FBGs Using Saturable Absorbers for Sensing with Fiber Lasers
Luis Rodriguez-Cobo1, Rosa A Perez-Herrera2, María A Quintela3
1CIBER-bbn, Instituto de Salud Carlos III, 28029 Madrid, Spain. luis.rodriguez@unican.es.
Abstract:
The spectral narrowing of Fiber Bragg Gratings (FBGs) introduced by unpumped Er-doped fiber (EDF) was analyzed for fiber lasers (FL). Owing to spatial hole burning (SHB), the spectral response of a virtual FBG can be employed for narrowing the band pass filter employed to determine the lasing wavelength of laser cavities. A common FL was mounted to analyze the spectral stability of the method, and a FL sensor for strain and temperature measurements was experimentally characterized to determine the stability of the narrowing effect achieved by the unpumped EDF, which acts as a virtual FBG. The results exhibited remarkably good narrowing effects of the spectral response of uniform FBGs.
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