Patent ID: 7133194
Filing Date: 2006-11-07
Classification: H01S

Abstract:
1. A wavelength tunable light source comprising: an optical amplifier amplifying and outputting a beam; a beam steering unit moving the path of the beam output from the optical amplifier in response to an electrical signal; and a concave diffraction grating diffracting the beam passing through the beam steering unit and incident thereon according to the incidence angle of the beam and reflecting part of the beam with a specific wavelength, wherein the path of beam produced by the optical amplifier is changed by the beam steering unit when the electrical signal is applied to the beam steering unit to be incident on the concave diffraction grating, and then diffracted and reflected by the concave diffraction grating such that only the part of the beam with the specific wavelength is fed back to the beam steering unit and the optical amplifier, thereby achieving wavelength tuning.