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.
We demonstrate a high speed fiber Bragg grating sensor array interrogation using 1.3 μm Fourier-domain modelocked
(FDML) wavelength-swept laser. The slope coefficients for measured relative wavelength difference and relative
time delay from the static strain are 1.02 pm/μstrain and 0.16 ns/μstrain, respectively. We demonstrate the dynamic
response of the FBG sensor array with 100 Hz modulation strain based on the FDML wavelength swept laser at 25.3 kHz
scanning rate. The FBG sensor interrogation system using FDML wavelength swept laser can be realized for the high
speed and high sensitivity monitoring systems.