OPTICAL WAVE GUIDE AND METHOD FOR MANUFACTURE THEREOF

摘要

An optical waveguide type amplifier which has a core (3) containing a rare earth element having a concentration distribution such that the concentration is high in a central portion of the core and become gradually lower toward the perimeter and also a modifying element for preventing the rare earth element from forming a cluster and for expanding the wavelength region for a light capable of being amplified having a concentration distribution similar to that of the rare earth element, wherein the concentration of the rare earth element is gradually decreased both in the X direction and the Y direction in a coordinate system formed, in a plane perpendicular to the light guiding direction of the core (3), by an X axis of the direction of the surface of a substrate (1) (the width direction of the plane) and a Y axis of the direction of the normal to the surface of a substrate (1) (the height direction of the plane). The optical waveguide type amplifier allows the achievement of an enhanced gain.