A wavelength selective switch includes an optical fiber array, a multiplexing/demultiplexing component, and a transmission direction adjustment component. The optical fiber array includes a first optical fiber and at least one second optical fiber. The first offset is used to compensate for a second offset of a diffraction spectrum generated when a plurality of single-wavelength optical signals obtained after an optical input signal is processed by the multiplexing/demultiplexing component arrive at the transmission direction adjustment component, so that the second offset of the diffraction spectrum of the plurality of single-wavelength optical signals arriving at the transmission direction adjustment component is 0 or may be ignored. An optical system has a simple structure, and no optical element needs to be added. This increases optical design freedom, facilitates optical path system commissioning, and reduces reliability risks and costs of subsequent products.

A short-waveband active optical component based on a vertical emitting laser and a multi-mode optical fiber has an emitting end and a receiving end. In the emitting end, multiple VCSELs generate multiple optical signals of different wavelengths, and multiple photodiodes in the receiving end receive the optical signals emitted by the VCSELs. Both ends use a focusing lens array to collimate and focus the optical signals A Z-block-shaped prism performs a light combining function at the emitting end, while another Z-block-shaped prism performs a light splitting function at the receiving end. Both ends use a focusing lens for collimating and focusing the optical signals at ends of a multi-mode optical fiber, which is used for transmitting the optical signals generated by the VCSELs. The short-waveband active optical component has a small size and a high transmission rate.

A polarization volume grating (PVG) includes a bulk, birefringent medium characterized by a plurality of helical structures with helix axes and a periodicity Λ.sub.y and an anisotropic alignment material having a rotatable optical axis, disposed on a top or bottom surface of the medium. The PVG is characterized in that the optical axis of the alignment material has a continuously rotated optical axis orientation in a plane of the material surface and a periodicity Λ.sub.x, wherein the helix axes are normal to the optical axes in the alignment material surface, further wherein the birefringent medium is characterized by a plurality of controllably slanted refractive index planes having a slant angle φ=±arctan (Λ.sub.y/Λ.sub.x) and a Bragg period Λ.sub.B. Fabrication methods are disclosed.

Apparatus and method are disclosed for co-aligning a number of laterally displaced radiation beams from respective radiation source outputs, each beam having a respective waveband. The apparatus comprises a collimating element for receiving each of said radiation beams with respective lateral displacements and a combining element for receiving each of said radiation beams passed by said collimating element. The apparatus further comprises a radiation source mount for positioning the radiation source outputs relative to the collimating element. The method comprises longitudinally positioning the radiation source outputs upon the mount, relative to the collimating element, in dependence upon the waveband of each beam, to cause the radiation beams passed by the combining element to be co-aligned.

An operation method of a remote laser projection device includes emitting multiple first lights to an optical transmission module through multiple light source modules, the optical transmission module includes multiple optical fibers, and each of the light source modules includes to a plurality of optical fibers; and transmitting the first lights to the projection head through the optical fiber of the corresponding optical transmission module.

A short-waveband active optical component based on a vertical emitting laser and a multi-mode optical fiber (3) is provided. In the component, multiple VCSELs (11) are configured to be used for generating multiple optical signals of different wavelengths; multiple photodiodes (15) are configured to be used for receiving the optical signals emitted by the VCSELs (11); two focusing lens arrays (12, 22) or lens array group elements are configured to be used for collimating and focusing optical signals at an emitting end (1) and a receiving end (2); two Z-block-shaped prisms (13, 23) are configured to be used for a light combining function of the emitting end (1) of the optical component and a light splitting function of the receiving end (2); one multi-mode optical fiber (3) is configured to be used for transmitting the optical signals generated by the VCSELs (11); and two focusing lenses (14, 24) are configured to be used for collimating and focusing optical signals at two ends of the multi-mode optical fiber (3). The short-waveband active optical component has a small size and a high transmission rate.

A wavelength selective switch includes: N input ports, an input-side fiber array, an input-side collimator array, an input-side beam deformation and polarization conversion component, an input-side wave-demultiplexing component, an input-side switching engine, a focusing transformation lens group, an output-side switching engine, an output-side wave-combining component, an output-side beam deformation and polarization conversion component, an output-side collimator array, an output-side fiber array, and M output ports. The focusing transformation lens group includes two identical aspheric convex lenses that are placed in parallel, where a curvature from a center to an edge of a surface of the aspheric convex lens changes continuously. A spatial position of the focusing transformation lens group and the curvature from the center to the edge of the surface are so set that light with different wavelengths from the input-side switching engine is focused to a corresponding position of the output-side switching engine respectively.

A wavelength switching apparatus includes M input components, a first optical component, a first switch array, a second switch array, a second optical component, and K output components. The M input components include at least one local input component having N input ports, and a light beam input by the local input component can be converged, under an action of the first optical component, on a row of switch units that are in the first switch array and that are corresponding to the local input component. In this way, this is equivalent to further connecting an N*1-dimensional WSS to an input end of an M*K-dimensional WSS, so that the wavelength switching apparatus can integrate a wavelength adding function based on the M*K-dimensional WSS.

Implementations disclosed describe a system comprising a first optical device to receive an input beam of light, the input beam having a plurality of spectral components of light, and cause the input beam to disperse into a plurality of spectral beams, wherein each of the plurality of spectral beams corresponds to one of the plurality of spectral components and propagates along a spatial path that is different from spatial paths of other spectral beams, and a second optical device to collect a portion of each of the spectral beams, wherein the collected portion depends on the spatial path of the respective spectral beam, and form an output beam of light from the collected portion of each of the spectral beams, wherein a spectral profile of the output beam is different from a spectral profile of the input beam of light.

A short-waveband active optical component based on a vertical emitting laser and a multi-mode optical fiber has an emitting end and a receiving end. In the emitting end, multiple VCSELs generate multiple optical signals of different wavelengths, and multiple photodiodes in the receiving end receive the optical signals emitted by the VCSELs. Both ends use a focusing lens array to collimate and focus the optical signals A Z-block-shaped prism performs a light combining function at the emitting end, while another Z-block-shaped prism performs a light splitting function at the receiving end. Both ends use a focusing lens for collimating and focusing the optical signals at ends of a multi-mode optical fiber, which is used for transmitting the optical signals generated by the VCSELs. The short-waveband active optical component has a small size and a high transmission rate.