We performed an experiment of wavelength-swept laser based on active mode-locking on reflective
semiconductor optical amplifier (RSOA). Since this laser does not have a wavelength-selecting filter, it can
achieve a high sweeping speed and reduce the component cost and size. Compared to the conventional SOA
gain medium, RSOA shows a merit of higher efficiency of cross gain modulation due to the twice propagation
of active gain region. We applied this laser to Fiber Bragg grating (FBG) strain sensor system which can have
faster data acquisition speed than conventional wavelength-swept laser method. The linear response of FBG
peak for the applied strain is monitored using the proposed laser source.