[8p-Z16-1~19] 3.14 Optical control devices and optical fibers

[8p-Z16-10] Lasing operation of EDF ring laser based on σ-type resonator with cascaded-chirped long period fiber grating

〇Koken Fukushima¹, Manuel Guterres Soares¹, Koki Nakaya¹, Atsushi Wada¹, Satoshi Tanaka¹, Fumihiko Ito² (1.NDA, 2.Shimane Univ.)

Keywords:fiber optic sensor, long period fiber grating, fiber optic ring laser

Previously, we have proposed an Erbium-doped fiber ring laser (EDFRL) using a cascaded-chirped long period fiber grating (C-CLPG) as a wavelength selection element from the viewpoint of the sensor applications. In this paper, a σ-type EDFRL is proposed by using an optical circulator and a Faraday rotator mirror (FRM) to realize the stable sensing operation. In this configuration, the C-CLPG, sensing element, is separated from the main loop of the EDFRL, and the FRM is capable of suppression of the fluctuation effects of the polarization state of the sensor part, so that more practical applications of the sensor are expected.