Wavelength-swept cascaded Raman fiber laser around 1310nm for OCT imaging

We experimentally demonstrated a novel wavelength-swept laser using a cascaded Raman gain around 1310 nm and a 1064/1310 WDM coupler in a ring cavity. Highly non-linear fiber of 2 km and fiber Bragg gratings at 1064, 1117, 1175, 1240nm are used to increase the power efficiency. Linear wavelength sweeping is demonstrated with the 100 Hz triangular driving signal to fiber Fabry-Perot tunable filter in the optimized ring cavity around 1310 nm region. The measured sweeping range and output power were 27 nm and 2.1 mW, respectively, which are suitable for OCT image.