Columbia University

Samantha P Roberts

Michal Lipson

You-Chia Chang

Christopher Thomas Phare

Aseema Mohanty

Brian Stern

Moshe Zadka

Utsav D Dave

A millimeter scale weak grating coupler comprising a silicon waveguide having bars of overlay material of length (a) disposed periodically at a period (&#x2227;) adjacent the silicon waveguide whereby a uniform grating output is achieved.

Millimeter scale long grating coupler

Light recycling within a waveguide is achieved by mode conversion instead of resonance. A structure is provided in in which light makes multiple passes through the same waveguide by converting the mode to a different mode after each pass and rerouting the light back into the same waveguide. The structure includes a bus waveguide and at least one mode converter device disposed at or adjacent each of two opposing ends of the bus waveguide, wherein each mode converter devices is configured to receive light having a receiving mode along a first direction and to cause light having a different mode from the receiving mode to propagate in a second direction opposite the first direction.

Resonance-free light recycling in waveguides

Growing community of inventors

Ithica, NY, United States of America

Samantha P Roberts