Locking the wavelength of a narrow linewidth optical fiber laser to the peak transmitting wavelength of a Fabry–Perot filter

Abstract

An optical fiber laser with a stable wavelength and a narrow linewidth spectrum is investigated by locking its wavelength to the peak transmitting wavelength of a Fabry–Perot filter. A fiber Bragg grating reflects the fluorescence emitted from erbium-doped fiber as the laser gain light; thus, the wavelength of the laser can be selected freely from the fluorescence spectrum of the erbium-doped fiber. The laser wavelength is locked to the peak transmitting wavelength of a Fabry–Perot filter, which compensates for the influences resulting from ambient disturbances with a feedback loop. The wavelength stability of the laser can exceed 10−8.