High-Resolution Spectrometer Based on Fiber Laser with Vibration-Induced Sweeping

Abstract— The application of a new type of tunable high-coherence laser—a fiber laser with vibration-induced sweeping (LVIS) in which the sweeping of its wavelength with a range of more than 2 nm is induced by the vibration of the FL cavity section—is experimentally shown for the first time for a high-resolution spectral analysis of a fiber Bragg grating (FBG). It is demonstrated that the use of a fiber LVIS makes it possible both to simplify the signal detection and improve the accuracy of measuring the FBG spectra by an order of magnitude in comparison with the schemes using pulsed self-sweeping lasers, owing to averaging a signal over a large number of points. The results of measurements show that the proposed method can be applied to resolve spectral structures with a width of about 64 MHz (\({\sim}0.5\) pm).