Patent ID: 11899254
Assignee: EFFECT PHOTONICS B.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. A photonic integrated circuit comprising:
an indium phosphide, InP,-based substrate that is provided with a first InP-based optical waveguide and a neighboring second InP-based optical waveguide;
a dielectric planarization layer that is arranged at least between the first optical waveguide and the second optical waveguide, wherein at least between the first optical waveguide and the second optical waveguide, the dielectric planarization layer is provided with:
a recess that is arranged to reduce or prevent optical interaction between the first optical waveguide and the second optical waveguide via the dielectric planarization layer;

wherein at the location of the recess, the dielectric planarization layer has:
a first sidewall that is arranged sloped towards the first optical waveguide; and
a second sidewall that is arranged sloped towards the second optical waveguide; and

wherein the recess is arranged to provide access to the InP-based substrate.