Tunable Linear Fiber Laser Cavity Based on a Twisted Mechanical Long Period Grating

Abstract

The present manuscript shows linear cavity fiber laser experimental analysis. The fiber laser arrangement, use an all fiber mechanical long period grating (MLPG) to control single and dual laser emission.  Here, single laser emission centered at 1562nm with a signal to noise ratio of 27dB and a linewidth less than 0.1nm is obtained and tuned from 1562nm to 1546nm, by twisted a conventional section of single mode fiber that was set into the MLPG. Thus, when the twist is around 120º dual emission is obtained with centered wavelengths at 1533nm and 1546nm, these emissions can be switched between them when the twist is incremented and the peak centered at 1546nm is tuned in backward direction. The proposed laser offers wavelength and power stability with minimal variations of   0.5dB and 0.5nm respectively.  This laser can be applied in several fields such as sensing, optical signal analysis and optical communications.