Base station optical line terminal of passive optical subscriber network using wavelength division multiplexing method and method for manufacturing the same

A base station optical line terminal of a passive optical subscriber network using a wavelength division multiplexing method, the base station optical line terminal comprising

• a wavelength division multiplexing unit on which a plurality of wavelength division multiplexers is integrated on a planar waveguide;
• a higher order grating unit in which a reflective grating with a higher order period on a waveguide connected to each output waveguide of the wavelength division multiplexing unit, wherein the higher order period of the reflective grating is wider than 3 periods;
• and
• a semiconductor optical device platform unit mounted thereon a plurality of semiconductor optical device units made of a plurality of semiconductor optical devices and constituting an external cavity laser by connecting outputs of the semiconductor optical devices to each waveguide of the higher order grating unit through an optical waveguide,
• wherein the wavelength division multiplexing unit, the higher order grating unit and the semiconductor optical device platform unit are hybrid-assembled on the same chip in the planar optical waveguide and an optical fiber for an optical output is attached to one end of the output waveguide of the wavelength division multiplexer of the wavelength division multiplexing unit.