The present disclosure provides a method for modification of surface of an initial optical fiber preform. The initial optical fiber preform is manufactured using at least one preform manufacturing process. The surface of the initial optical fiber preform is treated with 50-70 liters of chlorine per square meter of the surface of the initial optical fiber preform. The surface of the initial optical fiber preform is flame polished using a flame polishing module. The treatment of the surface of the initial optical fiber preform with chlorine and flame polishing of the surface of the initial optical fiber preform collectively converts the initial optical fiber preform into a modified optical fiber preform.

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.

Cable/line systems and related methods are provided. The cable/line systems include at least one central cable and an optical waveguide surrounding the cable. The optical waveguide includes an inner cladding, a core, and an outer cladding. Scattering structures are dispersed within the optical waveguide. The optical waveguide is configured to scatter light by way of the scattering structures away from the core to emit radial lighting along the length of the optical waveguide. The spectrum and/or luminance of the emitted light is controlled according to properties of the cable/line.

An optical connection identification assembly includes first and second connectors for conveying optical signals within and away from the optical connection identification assembly, first and second optical filters configured for conveying optical signals to and from the respective first and second connectors and between each other, and first and second photodiodes. The first photodiode is configured for receiving optical signals from the first optical filter to confirm the optical connection identification assembly is receiving optical signals. The second photodiode is configured for receiving optical signals from the second optical filter to confirm the optical connection identification assembly is receiving optical signals. The first and the second connectors are on opposite sides of each of the first and the second optical filters and each of the first and the second photodiodes. Multiple optical connection identification assemblies are used in a system to prepare a connectivity map of a fiber optic system.

An integrated fiber-ferrule useable as an optical coupling element includes a core directly contacting a cladding layer that has a lower index of refraction than that of the core, without an intervening adhesive. The cladding layer outer diameter is at least 100 times greater than that of the core, and matches an outer diameter of a standard ferrule. The integrated fiber-ferrule may be produced by drawing a glass preform into a cane, cutting the cane into sections, and shaping end faces of the cut sections (e.g., using a laser). To form a fiber optic assembly, a front end of an optical fiber core may be fusion spliced to a rear end of the core of the integrated fiber-ferrule. Use of an integrated fiber-ferrule permits reduction of core to fiber eccentricity, and reduction of connector insertion losses.

Plasmonic optical fibers, plasmonic optical sensors and methods of manufacturing the same. A fiber core conveys an optical signal therewithin and provides a plasmonic sensing area exposed to a fluid. The plasmonic sensing area is formed only on a section of an external surface of the fiber core. The plasmonic sensing area provides an interface within the section of the external surface for the conveyed signal to at least partially exit the fiber core and cause a modified optical signal to be conveyed in the fiber core. An optical signal generator may provide the optical signal to the plasmonic optical fiber, an optical signal receiver may discriminate the conveyed optical signal from the modified optical signal and a processor module may analyze the modified optical signal and identifies physical characteristics of the fluid present at the sensing area.

Disclosed is an optical fiber including a plasmonic optical filter with a closed curved shape provided at, at least portion thereof. A method of manufacturing the plasmonic optical filter includes a step of exposing a core, a step of forming a thin metal film on the core through physical vapor deposition while rotating the core in a circumferential direction after changing a rotation axis of the core, and a step of patterning nanopatterns on the cylinder-shaped thin metal film using focused ion beam technique assisted with endpoint detection method. Due to such constitutions, an active area to generate an optical signal for optical sensor can be increased.

An optical fiber device may include a core including a primary section and a secondary section. The secondary section may include at least one insert element inserted within the primary section at an off-center location with respect to a center of the primary section. The secondary section may twist about an axis of the optical fiber device along a length of the optical fiber device. A rate of twist at which the secondary section twists about the axis may increase from a first end of the optical fiber device toward a second end of the optical fiber device. The secondary section being twisted about the axis may cause an optical beam, launched at the first end of the optical fiber device, to be at least partially converted to a rotary optical beam at the second end of the optical fiber device.

Multi-clad optical fiber cladding light stripper (CLS) comprising an inner cladding with one or more recessed surface regions to remove light propagating within the inner cladding. A CLS may comprise such recessed surface regions along two or more azimuthal angles about the fiber axis, for example to improve stripping efficiency. One or more dimensions, or spatial distribution, of the recessed surface regions may be randomized, for example to improve stripping uniformity across a multiplicity of modes propagating within a cladding. Adjacent recessed surface regions may abut, for example, end-to-end, as segments of a recess that occupies a majority, or even an entirety, of the length of a fiber surrounded by a heat sink. One or more dimensions, or angular position, of individual ones of the abutted recessed surface regions may vary, according to a regular or irregular pattern.

The invention relates to an optical fiber system for generating a side-emitting optical scattered laser radiation from a coupled optical laser radiation consisting of at least one side-emitting optical fiber with a fiber input and a fiber output, wherein the side-emitting optical fiber has at least one fiber core, a scattering layer surrounding the fiber core, and at least one cladding layer surrounding the scattering layer, wherein by the scattering layer, side-emitting scattered laser radiation is generated from the optical laser radiation coupled into the optical fiber, and wherein a coupling-side connecting section of the side-emitting optical fiber at the fiber input is received in a fiber connector and to produce a mechanical connection to the fiber connector. Particularly, at least the scattering layer and the at least one cladding layer are removed by stripping to suppress the side-emitting scattered laser radiation in the connecting section at the free end.