US 2025/0164692 A1 · Waveguide Implementations With Adiabatic Structures

Abstract

Optical waveguides with adiabatic bends (e.g., hybrid partial Euler bends) are described herein. The optical waveguides are implemented into various optical components of integrated photonic devices to improve the performance of the optical components and allow for more compact manufacturing of the integrated photonic devices. In one example, a waveguide having a geometric path defined in a plane and a width perpendicular to the geometric path is described. The geometric path includes an adiabatic curve connecting a first inflection point to a second inflection point on the geometric path, the adiabatic curve including: a circular arc subtending an angle from a first endpoint to a second endpoint; a clothoid connecting the first inflection point to the first endpoint of the circular arc; and an anti-clothoid connecting the second endpoint of the circular arc to the second inflection point.

Claims25

Dependent claims

A waveguide having a geometric path defined in a plane and a width perpendicular to the geometric path,

wherein the geometric path comprises an adiabatic curve connecting a first inflection point to a second inflection point on the geometric path, the adiabatic curve comprising:
a circular arc subtending an angle from a first endpoint to a second endpoint, wherein the width of the waveguide is equal to a first width along the circular arc;
a clothoid connecting the first inflection point to the first endpoint of the circular arc, wherein the width of the waveguide increases from a second, different width to the first width along the clothoid;
and
an anti-clothoid connecting the second endpoint of the circular arc to the second inflection point, wherein the width of the waveguide decreases from the first width to a third width along the anti-clothoid.

2 more elements

An integrated photonic device, comprising:

a planar surface;
a looped waveguide disposed on the planar surface, the looped waveguide having a geometric path defined in the planar surface and a width perpendicular to the geometric path, wherein the geometric path comprises:
two adiabatic curves each connecting a respective first inflection point to a respective second inflection point on the geometric path, each adiabatic curve comprising:
a respective circular arc subtending an angle from a first endpoint to a second endpoint, wherein the width of the looped waveguide is equal to a first width along the circular arc;
a respective clothoid connecting the respective first inflection point to the first endpoint of the circular arc, wherein the width of the looped waveguide increases from a second, different width to the first width along the clothoid;
and
a respective anti-clothoid connecting the second endpoint of the circular arc to the respective second inflection point, wherein the width of the looped waveguide decreases from the first width to the second width along the anti-clothoid;
and
two parallel line segments each connecting one of the first inflections points to one of the second inflection points, wherein the width of the looped waveguide is equal to the second width along each of the two parallel line segments;
and
a bus waveguide disposed on the planar surface and evanescently coupled to the looped waveguide, the bus waveguide being parallel and adjacent to one of the two parallel line segments of the looped waveguide.

8 more elements

An integrated photonic device, comprising:

a first waveguide having a first geometric path defined in a plane and a width perpendicular to the first geometric path,
wherein the first geometric path comprises a first adiabatic curve connecting a first inflection point to a second inflection point on the first geometric path, the first adiabatic curve comprising:
a first circular arc subtending an angle from a first endpoint to a second endpoint about a conformal point, wherein the width of the first waveguide is equal to a first width along the first circular arc;
a first clothoid connecting the first inflection point on the first geometric path to the first endpoint of the first circular arc, wherein the width of the first waveguide increases from a second width to the first width along the first clothoid;
and
a first anti-clothoid connecting the second endpoint of the first circular arc to the second inflection point on the first geometric path, wherein the width of the first waveguide decreases from the first width to the second width along the first anti-clothoid;
and
a second waveguide evanescently coupled to the first waveguide, the second waveguide having a second geometric path defined in the plane and a width perpendicular to the second geometric path,
wherein the second geometric path comprises a second adiabatic curve connecting a first inflection point to a second inflection point on the second geometric path, the second adiabatic curve comprising:
a second circular arc subtending the angle from a first endpoint to a second endpoint about the conformal point, wherein the width of the second waveguide is equal to a third width along the second circular arc;
a second clothoid connecting the first inflection point on the second geometric path to the first endpoint of the second circular arc, wherein the width of the second waveguide increases from a fourth width to the third width along the second clothoid;
and
a second anti-clothoid connecting the second endpoint of the second circular arc to the second inflection point on the second geometric path, wherein the width of the second waveguide decreases from the third width to the fourth width along the second anti-clothoid.

10 more elements

Dependencies are inferred from the claim text.

Waveguide Implementations With Adiabatic Structures

Life of this patent

Waveguide Implementations With Adiabatic Structures

Life of this patent

Abstract

Claims25