Patent ID: 11860412
Assignee: CISCO TECHNOLOGY, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A delay line photonic arrangement comprising:
a first arm waveguide with a first optical phase;
a second arm waveguide with a second optical phase, wherein a difference between the first optical phase and the second optical phase changes according to a thermo-optic effect as a temperature of the first arm waveguide and the second arm waveguide fluctuates; and
a compensation structure comprising:
at least one compensation structure layer positioned above a waveguide plane comprising the waveguide;
at least one additional compensation structure layer positioned below the waveguide plane; and
at least one further compensation structure layer within the waveguide plane; and

wherein the at least one compensation structure layer is positioned at a first distance from at least one arm waveguide of the first arm waveguide and the second arm waveguide, wherein the compensation structure applies a compensation stress on the at least one arm waveguide via pressure exerted by the compensation structure on surrounding materials between the compensation structure and the at least one arm waveguide as a temperature of the compensation structure increases during operation, wherein the compensation stress alters the thermo-optic effect on the difference between the first optical phase and the second optical phase to counteract a change in a refractive index of the waveguide as a temperature of the photonic arrangement increases.