WAVELENGTH TUNABLE EXTERNAL CAVITY LASER

摘要

A wavelength tunable external cavity laser is provided to have stable optical coupling efficiency and oscillation characteristics by coupling a wavelength tunable waveguide Bragg-grating reflection filter and a semiconductor laser diode through an active alignment method using an additional substrate. A semiconductor laser diode(200) outputs a multi-wavelength optical signal and is mounted on a first substrate. A wavelength tunable reflection filter(103) is mounted on a second substrate, and outputs a single-wavelength optical signal using resonance of a diffraction grating, and changes the wavelength of the single-wavelength optical signal by changing a refractive index of the diffraction grating. The first substrate is a 3-5 compound semiconductor substrate. The second substrate is a silicon substrate, and the tunable reflection filter is formed with a polymer material with a negative thermo-optic coefficient and has a waveguide structure.