Experimental demonstration of a fast tunable laser based on DFB semiconductor laser array using reconstruction-equivalent-chirp (REC) technique

We propose a novel approach of fast tunable laser, which uses high-speed driving circuit and DFB semiconductor laser array to achieve the fast switching of wavelength. We use single chip microcomputer and FPGA to form the control system, and a high-speed driving circuit to ensure the switching speed. The 8-channel DFB laser array was fabricated based on reconstruction-equivalent-chirp (REC) technique. The experimental result shows that the switching time of the wavelength is about 30 ns.