k -domain linearization of wavelength-swept laser for optical coherence tomography

We propose a new method for k -domain linearization using fiber Bragg gratings (FBGs) in a wavelength-swept source for optical coherence tomography (OCT). A wavelength-swept source with a scanning fiber Fabry-Perot tunable filter is constructed using a conventional ring laser cavity. Five FBGs are used to recalibrate the nonlinear response from the wavelength-swept source. We achieved good quality sample imaging using the k -domain linearization algorithm based on FBGs. The sensitivity at 2 mm is improved by more than 10 dB after k -domain linearization.