Mach-zehnder interferometers having folded delay arms

Abstract

Structures for a Mach-Zehnder interferometer and methods of forming a structure for a Mach-Zehnder interferometer. The structure comprises a Mach-Zehnder interferometer including a first directional coupler, a second directional coupler, a first delay arm between the first and second directional couplers, and a second delay arm between the first and second directional couplers. The first delay arm includes a portion with a U-shape that surrounds a pocket, and the second delay arm includes a portion with a U-shape that extends into the pocket.

Dependencies are inferred from the claim text.