An embodiment includes a light source that generates measurement light including a first wavelength, a light source that generates stimulation light including a second wavelength, an optical coupling unit that is a WDM optical coupler including optical fibers branched between an output end and input ends, the input ends being optically coupled to an output of the light sources, and the WDM optical coupler combining the measurement light with the stimulation light and outputting the combination light from the output end, a photodetector that detects an intensity of reflected light from a DUT, a light irradiation and guide system that guides the combination light toward a measurement point on the DUT and guides the reflected light from the measurement point toward the photodetector, and a galvanometer mirror that moves the measurement point, and the optical fibers propagate light in a single mode for the first wavelength.

A semiconductor detector (100) for electromagnetic radiation within a wavelength range is disclosed, comprising a first waveguide portion (110), a funnel element (130) configured to funnel incident electromagnetic radiation into a first end (112) of the first waveguide portion, and a second waveguide portion (120) extending in parallel with the first waveguide portion. The second waveguide portion is coupled to the first waveguide portion and configured to out-couple electromagnetic radiation from the first waveguide portion, within a sub-range of the wavelength range. Further, a photodetector (140) including a photoactive layer (144) is arranged at a second end (114) of the first waveguide portion and at an end (124) of the second waveguide portion, and configured to separately detect electromagnetic radiation transmitted through and exiting the first waveguide portion and the second waveguide portion.

One feature pertains to an apparatus that includes apparatus that includes an evanescent field coupler having a first surface that evanescently couples light between the evanescent field coupler and an open dielectric resonator. The apparatus also includes a thin film coating covering at least a portion of the first surface of the evanescent field coupler. The thin film coating is specifically designed so that the thin film coating reflects light of a first wavelength.

A method includes defining a first waveguide in a first region of an optical device over a first dielectric layer over a silicon on insulator (SOI) substrate of the optical device and disposing a second dielectric layer on the first waveguide and the first dielectric layer of the optical device. The method also includes defining a second region on the second dielectric layer, the first dielectric layer, and the SOI substrate. The second region includes an integrated trench structure defined in the SOI substrate. The method further includes etching the second region to form an etched second region, disposing a third dielectric layer in the etched second region, and disposing a second waveguide on at least the third dielectric layer. The second waveguide is disposed to provide an optical coupling between the second waveguide and the first waveguide.

Provided is an optical multiplexing circuit. The waveguide width of each waveguide is set such that the effective refractive index of a first optical waveguide with a first light beam in the 0-th order mode is equal to the effective refractive index of a MM conversion waveguide with the first light beam in the higher order mode and that the effective refractive indexes of the MM conversion waveguide with second and third light beams in the higher order mode are not equal to the effective refractive indexes of a second optical waveguide with the second and third light beams in the 0-th order mode.

Embodiments disclosed herein generally relate to optical coupling between a highly-confined waveguide region and a low confined waveguide region in an optical device. The low confined waveguide region includes a trench in a substrate of the optical device in order to provide additional dielectric layer thickness for insulation between the substrate of the optical device and waveguides for light signals having a low optical mode. The low confined waveguide region is coupled to the highly-confined waveguide region via a waveguide overlap and in some embodiments via an intermediary coupling waveguide.

One example system comprises a substrate and a waveguide disposed on the substrate to define an optical path on the substrate. The waveguide is configured to guide, inside the waveguide and along the optical path, a light signal toward an edge of the waveguide. The edge defines an optical interface between the waveguide and a fluidic optical medium adjacent to the edge of the waveguide. The system also includes an optical fluid and a fluid actuator configured to adjust a physical state of the optical fluid based on a control signal. The adjustment of the physical state of the optical fluid causes an adjustment of the fluidic optical medium adjacent to the edge.

The invention relates to an optical multiplexer, a light source module, a two-dimensional optical scanning device and an image projection device, where the light beam intensity from a plurality of light sources can be attenuated to a desired value without installing an additional optical attenuator element. The optical coupling ratio of an optical coupling part provided in an optical multiplexing unit is set in such a manner that the total intensity of light beams that have been inputted into individual input optical waveguides from the light sources is attenuated by a value in a range from 5 dB to 40 dB at a stage of being outputted as multiplexed light from an output optical waveguide.

Structures for a filter and methods of fabricating a structure for a filter. The filter is coupled to a waveguide core. The filter includes a first plurality of grating structures positioned adjacent to a first section of the waveguide core and a second plurality of grating structures positioned adjacent to a second section of the waveguide core. The first plurality of grating structures are configured to cause laser light in a first portion of a wavelength band to be transferred between the first section of the waveguide core and the first plurality of grating structures. The second plurality of grating structures are configured to cause laser light in a second portion of a wavelength band to be transferred between the second section of the waveguide core and the second plurality of grating structures.

The invention concerns an optoelectronic chip including a pair of optical inputs having a same bandwidth, and each being adapted to a different polarization, at least one photonic circuit to be tested, and an optical coupling device configured to couple the two inputs to the circuit to be tested.