Multi Mode Interferometers

A multimode interferometer is essentially a broad waveguide with many (but a finite number) of guided modes. Each mode i, which we indicate as ψi, has a propagation constant βi. Because the modes are eigenmodes, they propagate independently from one another. When an MMI is excited by an incident wave, the field profile is decomposed into the eigenmodes. Even though there is no exchange of energy between these eigenmodes, they propagate at a different velocity, and the result is an interference pattern that changes along the length fo the MMI.

In order to avoid reflections, tapers are usually added to couple the access waveguide to the part of the MMI where the interference takes place. In Picazzo we provide MMIs with and without those tapers.

Tapered MMIs

MMITapered	Rectangular multimode interferometer, generated from a waveguide template with tapers.
MMIIdenticalTapered	Rectangular multimode interferometer, generated from a trace template with identical input and output trace_templates and with tapers.
MMISymmetricTapered	MMI with symmetrically distributed access templates and with tapers.
MMI1x2Tapered	MMI with one access waveguide and two output waveguides and with tapers that symmetrically distributed.
MMI2x1Tapered	MMI with two access waveguides and one output waveguides and with tapers that symmetrically distributed.
MMI2x2Tapered	MMI with one access waveguide and two output waveguides and with tapers that symmetrically distributed.

Untapered MMIs

MMI	Rectangular multimode interferometer, generated from a waveguide template
MMIIdentical	Rectangular multimode interferometer, generated from a trace template with identical input and output trace_templates.
MMISymmetric	MMI with symmetrically distributed access templates.
MMI1x2	MMI with one access waveguide and two output waveguides that symmetrically distributed.
MMI2x1	MMI with two access waveguides and one output waveguides that symmetrically distributed.
MMI2x2	MMI with one access waveguide and two output waveguides that symmetrically distributed.

Rib MMIs

RibMMIIdenticalTapered	Rectangular multimode interferometer, using a Ribwaveguide for the MMI with identical input and
RibMMISymmetricTapered	Rib MMI with symmetrically distributed access templates and with tapers.
RibMMI1x2Tapered	Rib 1x2 MMI with symmetrically distributed access templates and with tapers.
RibMMI2x1Tapered	Rib 2x1 MMI with symmetrically distributed access templates and with tapers.
RibMMI2x2Tapered	Rib 2x2 MMI with symmetrically distributed access templates and with tapers.