Dispersion-corrected arrayed waveguide grating

摘要

Techniques are described for forming an arrayed waveguide grating. In one example, an arrayed waveguide grating comprises a waveguide array coupled to the output of a parallel mode converter and a concave reflective diffraction grating coupled to the output of the waveguide array, wherein the waveguide array comprises a first waveguide and a second waveguide, wherein the first waveguide of the waveguide array has a different length from the second waveguide of the waveguide array. The waveguide array has a first dispersion having a first sign and a first magnitude, wherein the concave reflective diffraction grating has a second dispersion having a second sign and a second magnitude, wherein the second sign is opposite the first sign.

主权项

1. An arrayed waveguide grating comprising:
at least one input waveguide; a first free space region of a first slab waveguide coupled to an output of the input waveguide; a concave reflective mirror coupled to the first free space region of the first slab waveguide; a parallel mode converter coupled to the concave reflective mirror through the first free space region of the first slab waveguide; a waveguide array coupled to an output of the parallel mode converter,
wherein the waveguide array comprises a first waveguide and a second waveguide,wherein the first waveguide of the waveguide array follows a first path defined by an arc length of a first circle having a first radius,wherein the second waveguide of the waveguide array follows a second path defined by an arc length of a second circle having a second radius,wherein the first radius is different from the second radius, andwherein the first and second circles are positioned concentrically; a second free space region of a second slab waveguide coupled to an output of the waveguide array; a concave reflective diffraction grating coupled to an output of the second free space region of the second slab waveguide; and a plurality of output waveguides coupled to the concave reflective diffraction grating through the second free space region of the second slab waveguide.