The field of integrated health monitoring using Bragg grating optical fibre sensors including a sensor and methods for locating and installing this sensor on a support. The Bragg grating optical fibre sensor includes an optical fibre wherein at least one set of patterns forming a Bragg grating is written, the optical fibre further including a set of microstructures in the vicinity of each Bragg grating, the microstructures being separate from the patterns forming the Bragg grating, each microstructure being capable of scattering a portion of a light beam within a predetermined range of scattering wavelengths.

A method for forming hermetic seals between the cap and sub-mount for electronic and optoelectronic packages includes the formation of metal mounds on the sealing surfaces. Metal mounds, as precursors to a metal hermetic seal between the cap and sub-mount of a sub-mount assembly, facilitates the evacuation and purging of the volume created within cap and sub-mount assemblies prior to formation of the hermetic seal. The method is applied to discrete cap and sub-mount assemblies and also at the wafer level on singulated and non-singulated cap and sub-mount wafers. The method that includes the formation of the hermetic seal provides an inert environment for a plurality of electrical, optoelectrical, and optical die that are attached within an enclosed volume of the sub-mount assembly.

There is provided a method of manufacturing an optical connector, including: preparing a multi-core optical fiber including a glass fiber and a resin coating that covers the glass fiber; inserting the glass fiber exposed from the resin coating into the ferrule such that the glass fiber protrudes from an end surface of a ferrule by a length A; rotating and aligning the multi-core optical fiber with respect to the ferrule; fixing the multi-core optical fiber to the ferrule; and so as to scrap off a tip end of the ferrule by a length. A deviation angle in the circumferential direction between a first initial end surface of the one end of the prepared glass fiber and a cross section of the glass fiber separated from the initial end surface by a length A+B mm is equal to or less than 0.9°.

A light transmitting fibered medium comprises at least one optical fiber comprising a light output region comprising a light output window and a light guide region guiding a light wave to the light output region, and the light output window is formed in a spiral shape in an outer circumferential surface of the at least one optical fiber.

Techniques are described for using confinement structures and/or pattern gratings to reduce or prevent the wicking of sealant polymer (e.g., glue) into the optically active areas of a multi-layered optical assembly. A multi-layered optical structure may include multiple layers of substrate imprinted with waveguide grating patterns. The multiple layers may be secured using an edge adhesive, such as a resin, epoxy, glue, and so forth. A confinement structure such as an edge pattern may be imprinted along the edge of each layer to control and confine the capillary flow of the edge adhesive and prevent the edge adhesive from wicking into the functional waveguide grating patterns of the layers. Moreover, the edge adhesive may be carbon doped or otherwise blackened to reduce the reflection of light off the edge back into the interior of the layer, thus improving the optical function of the assembly.

A mode control system and method for controlling an output mode of a broadband radiation source including a photonic crystal fiber (PCF). The mode control system includes at least one detection unit configured to measure one or more parameters of radiation emitted from the broadband radiation source to generate measurement data, and a processing unit configured to evaluate mode purity of the radiation emitted from the broadband radiation source, from the measurement data. Based on the evaluation, the mode control system is configured to generate a control signal for optimization of one or more pump coupling conditions of the broadband radiation source. The one or more pump coupling conditions relate to the coupling of a pump laser beam with respect to a fiber core of the photonic crystal fiber.

An apparatus for sensing pressure and temperature includes: a hollow glass tube; a first optical fiber having an end disposed into a first end of the tube; a second optical fiber being disposed in a second end of the tube, the second optical fiber having a first solid core section followed by a hollow core section followed by a second solid core section, a first gap formed between the first and second optical fibers, a length of the first solid core section forming a second gap, and a length of the hollow core section forming a third gap; an optical interrogator that transmits light at various wavelengths and measures an intensity of reflected light due to the first gap, second gap, and third gap as a function of frequency to provide interrogation data; and a processor that matches the interrogation data to reference data to estimate the pressure and/or temperature.

Devices and method introduce micro-modifications into an optical waveguides. The devices comprise and the methods utilize a focusing optical unit for focusing a laser pulses into a core region of the optical waveguide, at least one motor-driven adjustment device for carrying out a linear movement between the optical waveguide and a focus of the focused laser beam pulse, a holder for the optical waveguide, and a rotation device for rotating the optical waveguide, wherein the at least one motor-driven adjustment device is configured for moving the focal position through the optical waveguide, while the rotation device is configured to modify a rotational speed of the optical waveguide.

Laterally emitting optical waveguides and method introduce micromodifications into an optical waveguide and provide optical waveguides. The waveguides and methods comprise an optical wave-guiding core, a region in the optical waveguide, wherein the micro-modifications are arranged in the region of the optical waveguide, wherein the arrangement of the micro-modifications is ordered.

Laterally emitting optical waveguides and method introduce micromodifications into an optical waveguide and provide optical waveguides. The waveguides and methods comprise an optical wave-guiding core, a region in the optical waveguide, wherein the micro-modifications are arranged in the region of the optical waveguide, wherein the arrangement of the micro-modifications is ordered.