The present disclosure provides a multi-pass free-carrier absorption variable optical attenuator device, including: a diode structure including a P-type doped region and an N-type doped region separated by an intrinsic region; and an optical waveguide including a plurality of optical waveguide sections aligned parallel to one another and disposed between the P-type doped region and the N-type doped region and within the intrinsic region of the diode structure. Further, the present disclosure provides a multi-pass thermal phase shifter device, including: a silicon structure including or coupled to one or more heater elements; and an optical waveguide including a plurality of optical waveguide sections aligned parallel to one another and disposed adjacent to the one or more heater elements. Optionally, at least two of the optical waveguide sections have different geometries and are separated by a predetermined gap.

A display according to an embodiment of the disclosure includes a light-emitting device and a display panel unit. The light-emitting device includes a light guide plate, a light source, a reflecting plate, and a dot pattern. The light guide plate has a light-outputting surface including a plurality of band-shaped projections extending in a direction orthogonal to the light-entering end surface. The light source is disposed along the light-entering end surface. The reflecting plate is disposed to face the rear surface of the light guide plate. The dot pattern fixes the light guide plate and the reflecting plate to each other and serves as a light scatterer. The display panel unit includes a display panel, an optical sheet, and a fixing layer. The fixing layer adheres or sticks the display panel and the optical sheet to each other and serves as a light diffuser.

A lidar system, including: a laser, an optical detector, a laser antenna, and a silicon-based integrated magneto-optical circulator. The silicon-based integrated magneto-optical circulator includes a silicon-based integrated Mach-Zehnder interference structure or a silicon-based integrated micro-ring structure, and silicon-based integrated magneto-optical waveguides. The silicon-based integrated magneto-optical circulator further includes an input port, a receiving port, and an emission port. The laser is aligned and coupled to the input port of the silicon-based integrated magneto-optical circulator via an optical fiber, a grating coupler, or an edge coupler. The optical detector is aligned and coupled to the receiving port of the silicon-based integrated magneto-optical circulator via the optical fiber, the grating coupler, or the edge coupler. The laser antenna is aligned and coupled to the emission port of the silicon-based integrated magneto-optical circulator via the optical fiber, the grating coupler, or the edge coupler.

An optical modulator includes a first shifter and a second shifter. The first shifter includes a first waveguide through which first light passes, and a first electrode that causes power according to a drive voltage to act on the first waveguide. The first shifter shifts a phase of the first light passing through the first waveguide in accordance with the drive voltage applied to the first electrode. The second shifter includes a second waveguide through which second light passes, and a second electrode that causes power according to a drive voltage to act on the second waveguide. The second shifter shifts a phase of the second light passing through the second waveguide in accordance with the drive voltage applied to the second electrode. The second shifter is constituted to have a smaller amount of phase shift according to a predetermined amount of drive voltage than the first shifter.

The invention relates to an optical system comprising: a laser source which generates pulsed laser radiation consisting of a temporal sequence of laser pulses; and at least one pulse compression device which is located in the beam path and has a non-linear medium, wherein the laser pulses undergo non-linear spectral broadening during propagation through the medium, and a chirp is applied to the laser pulses. The aim of the invention is to provide an optical system which makes it possible to generate non-linearly compressed laser pulses with improved temporal pulse contrast or with improved pulse quality. According to the disclosed approach, a group delay dispersion which varies along the beam path and which compensates at least partially for the chirp is applied to the laser pulses by the pulse compression device.

A liquid crystal coherent transparent display screen and a liquid crystal-laser transparent display system are provided. The liquid crystal coherent transparent display screen includes a first substrate, a second substrate, a first electrode layer, a first partial reflector, a first alignment layer, a second electrode layer, a second partial reflector, a second alignment layer, and a liquid crystal layer. The first partial reflector and the second partial reflector form an optical resonant microcavity, to replace the polarizer, the analyzer and the optical filters in conventional technology, thereby improving the light transmittance of liquid crystal transparent display.

The present disclosure provides an image capturing apparatus, including: a light source module configured to emit an incident light, wherein the light source module has a first surface and a second surface opposite to each other; an LCD module having a first surface and a second surface opposite to each other, wherein the second surface of LCD module faces the first surface of light source module, an air gap is formed between LCD module and light source module, and LCD module comprises a scattering layer for scattering the incident light; a light-transmitting cover plate having a first surface and a second surface, wherein first surface of the light-transmitting cover plate is configured to contact with an object to be captured, and second surface of the light-transmitting cover plate faces first surface of LCD module; and a sensor module configured to collect incident light reflected by light-transmitting cover plate.

The present disclosure provides an image capturing apparatus, including: a light source module having a first surface and a second surface opposite to each other; an LCD module having a first surface and a second surface opposite to each other, wherein the second surface of the LCD module faces the first surface of the light source module, and the LCD module includes a scattering layer for scattering an incident light; a light-transmitting cover plate having a first surface and a second surface opposite to each other, wherein the first surface of the light-transmitting cover plate is configured to contact with an object to be captured, and the second surface of the light-transmitting cover plate is configured to face the first surface of the LCD module; and a sensor module configured to collect the incident light reflected by the light-transmitting cover plate.

A backlight module is provided. A brightness enhancing layer is disposed on a surface of light-emitting layer. The brightness enhancing layer comprises a plurality of optical microcavities, and each of the microcavities is configured to resonate a part of light emitted by and entering the light-emitting layer to obtain resonant light and emit the resonant light. The backlight module can greatly improve brightness of the light-emitting layer. Furthermore, a display device having the backlight module is also provided.

Variable optical attenuator assisted control of optical devices is provided. A device comprises: an uncooled laser and ring resonator modulator, an optical waveguide configured convey an optical signal of the laser from an input to an output, a heater that heats the ring resonator modulator, a variable optical attenuator that attenuates the optical signal on the optical waveguide, one or more power monitors and a controller. The controller is configured to: in response to determining that one or more of: heater power overhead is unavailable to reduce heater power for laser wavelength tracking; and the heater power is at or below a given lower heater power; and determining that that laser current is increased to assist with ring resonator modulator control for the laser wavelength tracking: control, using the one or more power monitors, attenuation of the VOA to control the output power into a target output power range.