WAVEGUIDE STRUCTURE AND ARRAYED WAVEGUIDE GRATING STRUCTURE

摘要

PURPOSE: A waveguide structure and an arrayed waveguide grating structure are provided to improve a crosstalk characteristic by reducing a phase error of an arrayed waveguide and the coupling loss between the arrayed waveguide and a star coupler. CONSTITUTION: A plurality of arrayed waveguides(103) connect an input start coupler(102) and an outer star coupler(104) optically. The arrayed waveguides includes a first section with a high confinement factor and a second section with a low confinement factor. The first section of the arrayed waveguide has the same structure.