Structures including stacked photonics chips and methods of fabricating a structure including stacked photonics chips. The structure comprises a first chip including a first waveguide core, a ring resonator adjacent to a portion of the first waveguide core, and a first dielectric layer over the first waveguide core and the ring resonator. The first dielectric layer has a first surface. The structure further comprises a second chip including a second waveguide core and a second dielectric layer over the second waveguide core. The second dielectric layer has a second surface adjacent to the first surface of the first dielectric layer, and the second waveguide core is positioned adjacent to the ring resonator.

Methods, systems, and devices are disclosed for implementing athermal optical devices based on composite structures having different components with different thermal properties such as a composite structure having materials of positive and negative thermo-optic effects or a composite structure having materials exhibiting different thermal expansion coefficients. In one aspect, a method for providing thermally stabilized optical device structure against temperature fluctuations includes forming an optical device structure to include a first optical material and a second optical material different from the first optical material, in which one of the first and second optical material exhibits a positive thermal-optic effect and the other one exhibits a negative thermal-optic effect, and structuring the first and second optical materials in the optical device structure to reduce a change in an effective refractive index of the optical device structure collectively produced by the first and second optical materials in response to a temperature variation.

The disclosure relates to a tunable microring resonator, comprising a primary waveguide having first and second ends, a plurality of secondary waveguides each having a different length and each having first and second ends and a Micro-Electro-Mechanical System (MEMS) adjustable to optically couple at least a first end of the primary waveguide with a first respective end of a selected secondary waveguide thereby allowing light to circulate within the tunable microring resonator.

Systems and methods are provided for stabilizing the resonance properties of a microring resonator modulator. Intrinsic optical absorption within the p-n junction of a microring modulator resonator is employed as a feedback signal for thermally stabilizing the microring resonator modulator. In some example embodiments, the input optical power provided to a bus waveguide that is optically coupled to the microring resonator modulator is sufficiently low such that the photocurrent dependence on input power is predominantly linear in nature, thereby avoiding or reducing the effect of nonlinear absorption through two-photon absorption. The example embodiments described herein may be employed to achieve a fabrication process that is free of heterogeneous device integration, for example, avoiding the integration of germanium detectors with a silicon-based integrated optical circuit or the need to sacrifice a portion of the ring resonator circumference for the integration of an extrinsic defect-mediated photodetector, thus reducing complexity and manufacturing cost.

An electro-optic combiner includes a polarization splitter and rotator (PSR) that directs a portion of incoming light having a first polarization through a first optical waveguide (OW). The PSR rotates a portion of the incoming light having a second polarization to the first polarization to provide polarization-rotated light. The PSR directs the polarization-rotated light through a second OW. Each of the first and second OW's has a respective combiner section. The first and second OW combiner sections extend parallel to each other and have opposite light propagation directions. A plurality of ring resonators is disposed between the combiner sections of the first and second OW's and within an evanescent optically coupling distance of both the first and second OW's. Each of ring resonators operates at a respective resonant wavelength to optically couple light from the combiner section of the first OW into the combiner section of the second OW.

The present invention provides an optical device and a method for operating the same, the optical device including a substrate, an optical waveguide extending in a first direction on the substrate, and a ring resonator adjacent to the optical waveguide in a second direction intersecting the first direction on the substrate, wherein the ring resonator includes a first graphene layer and a second graphene layer on the substrate, a first insulating layer between the substrate and the first graphene layer, a second insulating layer between the first graphene layer and the second graphene layer, a first electrode and a second electrode connected to the first graphene layer, and a third electrode connected to the second graphene layer, wherein the first graphene layer, the second graphene layer, the first insulating layer, and the second insulating layer have a ring shape or a partially open ring shape.

A fiber ring resonator having a relatively long loop of standard single-mode fiber with a short nanofiber segment. The evanescent mode of the nanofiber segment allows the cavity-enhanced field to interact with atoms in close proximity to the nanofiber surface.

An example optical polarization controller can include a substantially planar substrate and a waveguide unit cell formed on the substantially planar substrate. The waveguide unit cell can include a first out-of-plane waveguide portion and a second out-of-plane waveguide portion coupled to the first out-of-plane waveguide portion. Each of the first and second out-of-plane waveguide portions can respectively include a core material layer arranged between a first optical cladding layer having a first stress-response property and a second optical cladding layer having a second stress-response property. The first and second stress-response properties can be different such that each of the first and second out-of-plane waveguide portions is deflected by a deflection angle.

The disclosure relates to a tunable microring resonator, comprising a primary waveguide having first and second ends, a plurality of secondary waveguides each having a different length and each having first and second ends and a Micro-Electro-Mechanical System (MEMS) adjustable to optically couple at least a first end of the primary waveguide with a first respective end of a selected secondary waveguide thereby allowing light to circulate within the tunable microring resonator.

A device and associated methods for using surface electromagnetic waves (SEWs) generated at the surface of photonic band gap multilayers (PBGMs) in place of surface plasmons (SPs) in metal films. One device is a photonic circuit comprising a multilayer apparatus to generate surface electromagnetic waves, wherein the surface electromagnetic waves comprise the signal medium within the circuit. The circuit may be formed or etched on the surface of the multilayer apparatus.