A semiconductor optical device includes: a base configured to intersect with a first direction; a first protrusion configured to protrude from the base in the first direction, the first protrusion including a planar lightwave circuit including: a core layer; and a cladding layer surrounding the core layer; a second protrusion configured to protrude from the base in the first direction and arranged along the first protrusion in a second direction intersecting with the first direction, a height of the second protrusion from the base in the first direction being lower than a height of the first protrusion; an optical semiconductor element placed on a facet of the second protrusion in the first direction and optically connected to the core layer; and a marker provided on the second protrusion in a manner exposed on the facet, the marker being made of a same material as the core layer.

An illumination system (200) includes an illumination device (202); an optical element (206) positioned to receive light (208) from the illumination device (202); a layer (210) of a transparent material disposed on the optical element (206) and positioned to receive light (208) from the illumination device (202); and an interlock circuit (220) configured to measure a resistivity of the layer (210) of transparent material and to control operation of the illumination device (202) based on the measured resistivity.

A light source device includes: a substrate having a support face; a plurality of light emitting elements disposed on the support face, the plurality of light emitting elements including a first light emitting element and a second light emitting element, each of which is a vertical-cavity surface-emitting laser element; and a planar lightwave circuit having a light incident face that faces the support face and including a plurality of optical waveguides configured to guide light that has exited from the respective plurality of light emitting elements and entered the light incident face. The planar lightwave circuit is directly or indirectly supported by the plurality of light emitting elements. The substrate includes a first wiring layer electrically connected to the first light emitting element and the second light emitting element.

A light source device includes: first and second laser diodes; a reflector having: first and second reflecting faces configured to reflect a portion of light from the respective first and second laser diodes and to transmit a portion of the light from the respective first and second laser diodes, and first and second exit faces configured to allow the portions of the light transmitted through the respective first and second reflecting faces to exit; and a photodetector including: first and second light receiving element configured to receive light exiting the first and second exit faces, respectively. The reflector is configured such that the light transmitted through the first reflecting face is hindered from exiting the second exit face and the light transmitted through the second reflecting face is hindered from exiting the first exit face.

A light emitting device includes: laser diodes (LDs); a planar lightwave circuit (PLC) including optical waveguides; and a lens. The optical waveguides include: a first optical waveguide to receive first light emitted from a first LD and to emit the first light from a first light-exiting end; and a second optical waveguide to receive second light emitted from a second LD and to emit the second light from a second light-exiting end. The first light-exiting end causes refraction such that the first light exits in a first direction. The second light-exiting end causes refraction such that the second light exits in a second direction. A distance from the first light-exiting end to the lens along the first direction is shorter than a distance from the second light-exiting end to the lens along the second direction.

In at least one embodiment, the radiation-emitting device comprises a laser bar for emitting laser radiation. The device further includes a waveguide having a core, a cladding, an entry face, and an exit face. The device may include a heat sink having a mounting side where the waveguide is applied thereon, the cladding being arranged at least above and below the core in relation to the mounting side. The device may be configured so that, during operation, the laser radiation impinges on the entry face of the waveguide and passes from there into the core. The core may include a conversion element configured to convert the laser radiation into secondary radiation. The waveguide may be configured to guide the laser radiation and/or the secondary radiation inside the core as far as the exit face by reflection at the interface between the cladding and the core.

In at least one embodiment, the radiation-emitting device comprises a laser bar for emitting laser radiation. The device further includes a waveguide having a core, a cladding, an entry face, and an exit face. The device may include a heat sink having a mounting side where the waveguide is applied thereon, the cladding being arranged at least above and below the core in relation to the mounting side. The device may be configured so that, during operation, the laser radiation impinges on the entry face of the waveguide and passes from there into the core. The core may include a conversion element configured to convert the laser radiation into secondary radiation. The waveguide may be configured to guide the laser radiation and/or the secondary radiation inside the core as far as the exit face by reflection at the interface between the cladding and the core.

An optical device may include a substrate and vertical-cavity surface-emitting lasers (VCSELs) on the substrate. The optical device may also include a coupling layer over the substrate and that includes optical guides aligned with the VCSELs to guide outputs thereof from a vertical path direction to a lateral path direction. The optical device also includes controllable delay elements, each controllable delay element associated with a respective optical guide, and a controller coupled to the controllable delay elements.

Configurations are disclosed for multi-wavelength optical devices and systems. In particular, multi-wavelength optical devices that include separate chips optically connected via phonic wire bonds. The disclosed configurations can utilize photonic wire bond interconnects and photonic wire bond interconnection techniques, which may facilitate low-cost implementation of wavelength division multiplexed optical systems.

The invention relates to a device for coupling a flared laser source (10) and an output waveguide (3), comprising a coupler (20), a combiner (40), and a network of intermediate waveguides (30) located between the coupler and the combiner and comprising a correcting central section (S.sub.c) in which an effective index associated with the guided modes is adjusted so that the optical paths of the intermediate waveguides (30) between the coupler (20) and the combiner (40) are identical to one another.