HIGH RESOLUTION SPECTROMETER BASED ON A FIBER LASER WITH VIBRATION-INDUCED SWEEPING
E.K. Kashirina, I.A. Lobach, S.I. Kablukov
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: spectral analysis, wavelength tuning, erbium fiber laser, FBG
Abstract
For a high-resolution spectral analysis of a fiber Bragg grating (FBG), the use of a new type of a tunable highly coherent laser, i.e., a fiber laser with vibration-induced sweeping, is demonstrated for the first time, in which wavelength tuning in the 2-nm range is induced by vibration of a part of the laser cavity. It is demonstrated that the use of the fiber laser makes it possible both to simplify the signal detection and to increase the accuracy of measuring the FBG spectra by an order of magnitude compared to schemes where pulsed self-sweeping lasers are used, due to averaging the signal over a larger number of points. The measurements show that the proposed technique can be used to resolve structures with a spectral width of about 64 MHz (~ 0.5 pm).
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