Patent ID: 6442314
Filing Date: 2002-08-27
Classification: G02B

Abstract:
An arrayed waveguide grating in which a plurality of optical signals with varying wavelengths which are inputted from optical input waveguides are propagated while the signals are provided with phase differences for each wavelength by arrayed waveguides, and made incident onto different optical output waveguides for each wavelength, and light beams with varying wavelengths are outputted from the different optical output waveguides, comprising:one or more of the optical input waveguides disposed side-by-side; a first slab waveguide connected to the output end of said optical input waveguides; the plurality of arrayed waveguides, which are disposed side-by-side, and have lengths different from each other to propagate light led out from said first slab waveguide, and are connected to the output end of said first slab waveguide; a second slab waveguide connected to the output end of said plurality of arrayed waveguides; and the plurality of optical output waveguides disposed side-by-side and connected to the output end of said second slab waveguide, wherein a fluctuation in the refractive index of a core in its propagation direction over entire lengths of said arrayed waveguides is restrained, causing the standard deviation of the phase error distribution generated on the entire length of the plurality of arrayed waveguides in the propagation direction to be restrained to 0.6 rad or less.