WAVELENGTH VARIABLE LIGHT SOURCE

摘要

PROBLEM TO BE SOLVED: To provide a wavelength variable light source capable of individually adjusting light power of two outputs and being small size.SOLUTION: The wavelength variable light source of the invention comprises: a wavelength variable light source part for outputting laser beam; an optic amplifier for amplifying the laser beam outputted from the wavelength variable light source part; and a branch part for branching into two branches the laser beam outputted after being amplified by the optic amplifier. The branch part is a Mach-Zehnder interferometer or a directional coupler, and to the branch part, an electrode for adjusting a branch ratio of the laser beam at the branch part is coupled.