Abstract: An integrated avalanche photodetector and a method for fabrication thereof. The integrated avalanche photodetector comprises a Ge body adapted to conduct an optical mode. The Ge body comprises a first p-doped region that extends from a first main surface to a second main surface of the Ge body. The Ge body further comprises a first n-doped region that extends from the first main surface towards the second main surface of the Ge body. An intrinsic region occupies the undoped part of the Ge body. A first avalanche junction is formed by the first n-doped region that is located aside the p-doped region. The Ge body further comprises an incidence surface, suitable for receiving an optical mode, and a second n-doped Ge region that covers the Ge body and forms a second avalanche junction with the first p-doped region at the first main surface.

Abstract: The present disclosure generally relates to a method of optically coupling a photonic integrated circuit and an external optical component.

Abstract: A hybrid laser for generating radiation includes an optical passive material and an optical active material. The laser includes a first optical waveguide and optical laser components with reflectors in the optical passive material. The first optical waveguide is adapted for coupling out radiation from the hybrid laser. The laser also includes a second optical waveguide defined in the optical active material. The optical laser components include reflectors defining a cavity and furthermore are adapted for providing laser cavity confinement in the first optical waveguide and the second optical waveguide. The second optical waveguide thereby is positioned at least partly over the first optical waveguide so that an evanescent coupling interface is defined between the second optical waveguide and the first optical waveguide and the evanescent coupling interface is positioned within the laser cavity.

Abstract: The present invention relates to an integrated photonic device (100) operatively coupleable with an optical element (300) in a first coupling direction. The integrated photonic device (100) comprises an integrated photonic waveguide (120) and a grating coupler (130) that is adapted for diffracting light from the waveguide (120) into a second coupling direction different from the first coupling direction. The integrated photonics device also comprises a refractive element (110) disposed adjacent the grating coupler (130) and adapted to refract the light emerging from the grating coupler (130) in the second coupling direction into the first coupling direction.

Abstract: A photonics integrated circuit for processing radiation includes a first-dimensional grating coupler for coupling in radiation, a second two-dimensional grating coupler for coupling out radiation and a waveguide structure having two distinct waveguide arms for splitting radiation received from the first grating coupler and recombining radiation in the second grating coupler. A phase shifting means furthermore is provided for inducing an additional phase shift in at least one of the two distinct waveguide arms thereby inducing a relative phase shift of ? between the two distinct waveguide arms so as to provide a TE/TM polarization switch for radiation between the first grating coupler and the second grating coupler.

Abstract: Method of producing a photonic device including at least one light source and at least one photodetector on a structure including a waveguide layer, this method comprising the following steps: a) growing successively on a substrate (10), a photodetection structure (11) and a light source structure (12), the photodetection structure and the light source structure being made of a stack of layers, the light source layers being stacked on top of the photodetector layers and both structures sharing one of these layers.

Abstract: Photonic structures and methods of operating the photonic structures are disclosed. In one embodiment, the photonic structure includes a detector configured to detect radiation of a first wavelength range. The radiation of the first wavelength range is received from an external radiation guide, and the detector is substantially transparent to radiation of a second wavelength range that differs from the first wavelength range. The photonic structure further includes a coupling structure configured to free space couple out of the photonic structure radiation of the second wavelength range. The photonic structure further includes a guiding structure configured to optically guide the radiation of the second wavelength range through the detector.

Abstract: An optical device for optically multiplexing or demultiplexing light of different predetermined wavelengths is provided, the optical device comprising at least one first waveguide (11) and at least one second waveguide (12) formed on a substrate (10), wherein the at least one first waveguide and the at least one second waveguide intersect at an intersection, comprising a diffraction grating structure (13) formed at the intersection. There exists a first wavelength or wavelength band travelling within the first waveguide (11) exciting the grating structure and being diffracted an angle corresponding to an outcoupling direction and there exists a second wavelength or wavelength band, different from the first wavelength or wavelength band, travelling within the second waveguide (12) exciting the grating structure and being diffracted at an angle corresponding to the same outcoupling direction.

Abstract: A hybrid laser for generating radiation includes an optical passive material and an optical active material. The laser includes a first optical waveguide and optical laser components with reflectors in the optical passive material. The first optical waveguide is adapted for coupling out radiation from the hybrid laser. The laser also includes a second optical waveguide defined in the optical active material. The optical laser components include reflectors defining a cavity and furthermore are adapted for providing laser cavity confinement in the first optical waveguide and the second optical waveguide. The second optical waveguide thereby is positioned at least partly over the first optical waveguide so that an evanescent coupling interface is defined between the second optical waveguide and the first optical waveguide and the evanescent coupling interface is positioned within the laser cavity.

Abstract: A photonics integrated circuit for processing radiation includes a first-dimensional grating coupler for coupling in radiation, a second two-dimensional grating coupler for coupling out radiation and a waveguide structure having two distinct waveguide arms for splitting radiation received from the first grating coupler and recombining radiation in the second grating coupler. A phase shifting means furthermore is provided for inducing an additional phase shift in at least one of the two distinct waveguide arms thereby inducing a relative phase shift of ? between the two distinct waveguide arms so as to provide a TE/TM polarization switch for radiation between the first grating coupler and the second grating coupler.

Abstract: Disclosed are optical devices for coupling radiation between an optical waveguide and an external medium. In one embodiment, an optical device is disclosed comprising a semiconductor die comprising an integrated optical waveguide core and an overlying optical waveguide comprising a waveguide taper and a waveguide facet. The overlying optical waveguide at least partially overlies the integrated optical waveguide core, and the waveguide facet is between about 1 ?m and 200 ?m from an edge of the semiconductor die. In another embodiment, a method is disclosed comprising providing a substrate comprising an integrated semiconductor waveguide and forming on the substrate an overlying waveguide comprising a waveguide taper and a waveguide facet. The overlying waveguide at least partially overlies the integrated semiconductor waveguide. The method further includes cutting the substrate about 1 ?m and 200 ?m from the waveguide facet.

Abstract: Method of producing a photonic device including at least one light source and at least one photodetector on a structure including a waveguide layer, this method comprising the following steps: a) growing successively on a substrate (10), a photodetection structure (11) and a light source structure (12), the photodetection structure and the light source structure being made of a stack of layers, the light source layers being stacked on top of the photodetector layers and both structures sharing one of these layers.

Abstract: Photonic structures and methods of operating the photonic structures are disclosed. In one embodiment, the photonic structure includes a detector configured to detect radiation of a first wavelength range. The radiation of the first wavelength range is received from an external radiation guide, and the detector is substantially transparent to radiation of a second wavelength range that differs from the first wavelength range. The photonic structure further includes a coupling structure configured to free space couple out of the photonic structure radiation of the second wavelength range. The photonic structure further includes a guiding structure configured to optically guide the radiation of the second wavelength range through the detector.

Abstract: The present invention relates to an integrated photonic device (100) operatively coupleable with an optical element (300) in a first coupling direction. The integrated photonic device (100) comprises an integrated photonic waveguide (120) and a grating coupler (130) that is adapted for diffracting light from the waveguide (120) into a second coupling direction different from the first coupling direction. The integrated photonics device also comprises a refractive element (110) disposed adjacent the grating coupler (130) and adapted to refract the light emerging from the grating coupler (130) in the second coupling direction into the first coupling direction.

Abstract: Disclosed are an integrated optical coupler, and a method of optically coupling light, between an optical element and at least one integrated optical waveguide. The optical coupler includes a grating structure and is adapted for coupling light to waveguide modes with different polarization with low polarization dependent loss. For example, polarization dependent loss may be smaller than 0.5 dB. The waveguide modes may include a Transverse Electric (TE) waveguide mode and a Transverse Magnetic (TM) waveguide mode. The optical coupler may further include a two-dimensional grating structure adapted for providing polarization splitting for a first optical signal of a first predetermined wavelength and for coupling both polarizations forward or backward.

Abstract: An optical device for optically multiplexing or demultiplexing light of different predetermined wavelengths is provided, the optical device comprising at least one first waveguide (11) and at least one second waveguide (12) formed on a substrate (10), wherein the at least one first waveguide and the at least one second waveguide intersect at an intersection, comprising a diffraction grating structure (13) formed at the intersection. There exists a first wavelength or wavelength band travelling within the first waveguide (11) exciting the grating structure and being diffracted an angle corresponding to an outcoupling direction and there exists a second wavelength or wavelength band, different from the first wavelength or wavelength band, travelling within the second waveguide (12) exciting the grating structure and being diffracted at an angle corresponding to the same outcoupling direction.