The application provides a interface light path structure with all polarization-maintaining function. A first polarization-maintaining-transferring device includes a first port, a second port, and a third port, wherein the first port receives a first polarized light output by the polarization beam-splitting device, the second port is connected to the first Faraday rotation mirror, and the third port is connected to a first port of the first polarization-maintaining coupler. A second polarization-maintaining-transferring device includes a first port, a second port, and a third port, wherein the first port receives a second polarized light output by the polarization beam-splitting device, the second port is connected to the second Faraday rotation mirror, and the third port is connected to a second port of the first polarization-maintaining coupler.

An optical wiring component includes an optical waveguide component that has a first end surface and a second end surface and includes a plurality of optical waveguides extending from the first end surface to the second end surface, an angle formed by a plane including the first end surface and a plane including the second end surface being 70° or more, a plurality of optical fibers that have a first end and a second end, one or more first optical connectors that are mounted on the first end and fixed to the optical waveguide component at the first end surface by an adhesive agent, and one or more second optical connectors that are mounted on the second end.

A manufacturing method of an optical splitter of the present disclosure includes: performing first processing that involves mounting a coated optical fiber on a jig configured to store the coated optical fiber, and polishing the coated optical fiber together with the jig until reaching a vicinity of a core of the coated optical fiber or the core of the coated optical fiber; performing second processing that involves applying a refractive index matching material having a refractive index lower than a refractive index of the core of the coated optical fiber onto a polished face of the coated optical fiber on the jig polished in the first processing or onto a polished face of an optical waveguide circuit having been polished in advance until reaching a vicinity of a core or reaching the core, and then bonding the polished faces to each other; and performing third processing that involves positionally aligning the polished faces bonded with each other in the second processing to move the jig or the optical waveguide circuit to a position at which a desired splitting ratio is obtained.

A fiber array unit (FAU) includes a substrate, a plurality of optical fibers, and a lid. The substrate includes: an optical window extending through a layer of non-transparent material, a plurality of grooves, and an alignment protrusion configured to mate with an alignment receiver. The plurality of optical fibers are disposed in the plurality of grooves. The alignment protrusion is configured to align the plurality of optical fibers with an external device when mated with the alignment receiver. The plurality of optical fibers is disposed between the lid and the substrate.

A waveguide illuminator includes an input waveguide, a waveguide splitter coupled to the input waveguide, and a waveguide array coupled to the waveguide splitter. The waveguide array includes an array of out-couplers out-coupling portions of the split light beam to form an array of out-coupled beam portions for illuminating a display panel. Locations of the array of out-couplers are coordinated with locations of individual pixels of the display panel, causing each light beam portion to propagate through a corresponding pixel of the display panel, thereby improving efficiency of light utilization by the display panel.

An optical multiplexing and demultiplexing method of the present disclosure includes arranging, face to face, a polished surface of a coated optical fiber whose side surface is polished to a core or a vicinity of the core and a polished surface of a plurality of optical waveguides that are arranged in parallel in a longitudinal plane and that each have different propagation constants and whose side surfaces are polished to cores corresponding one to one therewith or vicinities of the cores; and aligning the polished surface of the coated optical fiber and the polished surface of the plurality of optical waveguides so that desired branching ratio is obtained from one end of the coated optical fiber to the end, distal to the former end, of one optical waveguide of the plurality of optical waveguides by relatively moving the polished surface of the coated optical fiber and the polished surface of the plurality of optical waveguides.

An optical telescope may include an array of optical lenslets in a common plane, and optical waveguides extending from respective optical lenslets and each having a common optical path delay. Further, at least one optical star coupler may be downstream from the optical waveguides, and an optical detector may be downstream from the at least one optical star coupler and having an optical image formed thereon.

A fiber optic splitter arrangement includes a housing defining a non-enterable interior; at least one optical power splitter disposed within the non-enterable interior; an input port carried by the housing; and a multi-fiber connection port carried by the housing. The input port and/or the multi-fiber connection port may be attached directly to the housing. Output fibers of more than one optical power splitter disposed within the non-enterable interior may be routed to the same multi-fiber connection port. Output fibers of a single optical power splitter may be routed to multiple multi-fiber connection ports.

A fiber optic splitter arrangement includes a housing defining a non-enterable interior; at least one optical power splitter disposed within the non-enterable interior; an input port carried by the housing; and a multi-fiber connection port carried by the housing. The input port and/or the multi-fiber connection port may be attached directly to the housing. Output fibers of more than one optical power splitter disposed within the non-enterable interior may be routed to the same multi-fiber connection port. Output fibers of a single optical power splitter may be routed to multiple multi-fiber connection ports.

An optical device includes a modulator and a tap coupler. The modulator includes an optical waveguide that is formed of a thin-film lithium niobate (LN) substrate and through which light passes, and an electrode that applies voltage to the optical waveguide, and modulates a phase of light that passes through the optical waveguide in accordance with an electric field in the optical waveguide, where the electric field corresponds to the voltage. The tap coupler includes at least a part formed of the thin-film LN substrate, and splits a part of the light that passes through an inside of the optical waveguide. The tap coupler includes a delayed interferometer that splits a part of the light that passes through the optical waveguide, at a split ratio corresponding to a phase difference of light that passes through an inside of the tap coupler from the optical waveguide.