A disclosed optical waveguide element includes a cladding portion formed on a substrate; an optical waveguide which is formed inside the cladding portion and has a refractive index higher than that of the cladding portion; an optical filter which is inserted into a slit formed in the cladding portion to divide the optical waveguide into a first optical waveguide and a second optical waveguide; and a first thin film element which is inserted into the slit along with the optical filter and is provided with a first thin film lens, wherein the first thin film lens provided in the first thin film element converges light that has propagated through the first optical waveguide and outputs into the slit into the second optical waveguide.

A pulsed laser device includes: a semiconductor laser device that outputs laser light having a single wavelength; a semiconductor optical amplifier that receives the laser light output from the semiconductor laser device and amplifies the laser light to output; and a semiconductor-optical-amplifier driver that supplies a pulse-modulated semiconductor-optical-amplifier driving current to the semiconductor optical amplifier.

The disclosed subject matter relates to a polarization-maintaining very large mode area (PM VLMA) Erbium-doped fiber and a polarization maintaining, Er-doped VLMA amplifier.

Provided are a metallic micro/nano-structure and an optical fiber having it on the end-facet. The metallic micro/nano-structure comprises of a metallic film and a micro/nano pattern in the metallic film. The micro/nano pattern divides the metallic film into a periodic structure and an embedded defect structure; the defect structure locally breaks the periodicity of the periodic structure; in at least one dimension, the periodic structure has a period T satisfying 0.75<T<1.25, is a wavelength of a surface plasmon at an interface between the metallic film and a medium; and the surface plasmon resonates within the defect structure and its surrounding area. The optical fiber end-facet device takes the advantages of single-mode optical fiber systems, including stable optical transmission, compact systems and flexible configurations. It achieves high efficiency coupling between fiber guided lightwaves and surface plasmon resonance, using a metallic micro/nano-structure which is a distributed feedback resonant cavity.

Disclosed is an optical fiber probe for an optical treatment including a core, to which incident light is guided, a cladding disposed to surround the core, a side surface divergence part connected to the core and configured to diverge the incident light guided to the core to a side surface of a cylindrical column, a diffusion layer disposed to surround the side surface divergence part, a distal end divergence part connected to the side surface divergence part, having a cylindrical shape, and configured to diverge the incident light guided to the side surface divergence part to the outside, and a coating layer disposed to surround the cladding and the diffusion layer and configured to seal the cladding and the diffusion layer, wherein the refractive index of the cladding is lower than the refractive index of the core, the refractive index of the diffusion layer is higher than the refractive index of the core, and the refractive index of the coating layer is higher than the refractive indices of the cladding and the diffusion layer.

An all-glass cladding mode stripper comprises a plurality of high refractive index, small diameter glass beads disposed along an exposed portion of the inner cladding region of an optical fiber. The unwanted low NA signal light (as well as any other type of stray light) propagating within the cladding layer is removed by refracting into the adjacent beads, where this captured light then scatters away from the optical fiber.

An insertion system includes an insertion apparatus including an insertion section, a fiber sensor configured to detect a bend shape of the insertion section, an attitude detector, and an attitude shape calculator. The attitude detector is configured to detect at least one of a first rotational change quantity related to a change quantity of rotation about a longitudinal direction of the insertion apparatus, and a first directional change quantity related to a change quantity of the longitudinal direction. The attitude shape calculator is configured to calculate attitude shape information including at least one of a change quantity of rotation of the bend shape and a change quantity of a direction of the bend shape, based on the bend shape and the at least one of the first rotational change quantity and first directional change quantity.

The invention describes a fiber light module comprising at least two light distribution fibers, wherein each light distribution fiber is enclosed in a corresponding fiber guiding tube, wherein the fiber guiding tubes are at least partly translucent and mechanically coupled by a stabilization structure, wherein the fiber light module further comprises a guiding structure mechanically coupled to the stabilization structure by means of a mechanical coupling interface, wherein the guiding structure is arranged to preserve a spatial arrangement of the stabilization structure along the mechanical coupling interface. The invention further describes a vehicle signaling light assembly comprising such a fiber light module and a vehicle signaling light which comprises such a vehicle signaling light assembly or fiber light module.

A device including an optical tap and waveguide in the core and cladding of an optical fiber together with a glass ferrule that is angle polished to provide a reflection surface (with or without total internal reflection) that produces a reflection of the light tapped from the optical fiber to reach the bottom of the glass ferrule and propagate in a direction that is perpendicular to (or at least different than the direction of propagation close to) the axis of the optical fiber. The fiber waveguide may be created using an ultrafast fabrication method and the glass ferrule can itself be modified by the same ultrafast laser technique to further manipulate the light traveling inside.

An optical probe for use in medical instrumentation where a sheath is covering the optical probe, wherein the optical probe is configured to correct astigmatism by incorporating asymmetric optical powers.