Method for fabricating laser diode having optical fiber Bragg grating as front mirror of external resonator and laser diode fabricated thereby

A laser having an optical fiber Bragg grating as a front mirror of external resonator comprising:

• a ferrule provided with a cylindrical free space penetrating both ends thereof;
• an optical fiber fixedly inserted into the ferrule and including the optical fiber Bragg grating formed at a designated region thereof, which is inserted into the cylindrical free space;
• a light source optically coupled to one end of the optical fiber;
• and
• a tube disposed at the other end of the optical fiber connected to the light source, and provided with a cylindrical free space penetrating both ends thereof, into which the optical fiber is inserted, and one end fixed to one end of the ferrule,
• wherein the optical fiber is fixed to the cylindrical free space of the ferrule by a first thermal epoxy resin applied to a partial region of the outer cylindrical surface of the optical fiber at the other region, at which the optical fiber Bragg grating is not formed, and is fixed to the cylindrical free space of the tube by a second thermal epoxy resin, and the tube and the ferrule are fixed to each other by a third thermal epoxy resin.