In some examples, a microstructured fiber comprises a cladding material surrounding at least one core material, wherein the at least one core material comprises an array of discrete devices contacted in parallel. A method of producing a microstructured fiber may include 3D-printing a fiber preform, thermally drawing the fiber preform into a fiber that preserves the cross-sectional geometry of the fiber preform, and axially patterning the fiber into a microstructured fiber comprising an array of discrete devices contacted in parallel. In some embodiments, microstructured fibers may be integrated into a sensory textile that includes at least one of an electrooptic portion, a sonar portion, a magnetic gradiometer portion, and a piezogenerating portion. In some embodiments, microstructured fibers may be formed into an in-fiber integrated quantum device circuit or an in-fiber ion trap.

A photonic integrated circuit (PIC) package comprising a first die, the first die comprising a first optical waveguide and a first trench extending from a first edge of the first die to the first optical waveguide. The first trench is aligned with the first optical waveguide. A second die comprises a second optical waveguide and a second trench extending from a second edge of the second die to the second optical waveguide. The second trench is aligned with the second optical waveguide. An optical wire comprising an uncladded glass fiber comprises a first terminal portion extending within the first trench and a second terminal portion extending within the second trench. The first terminal portion is aligned with the first optical waveguide and the second terminal portion is aligned with the second optical waveguide.

A photonic integrated circuit (PIC) package comprising a first die, the first die comprising a first optical waveguide and a first trench extending from a first edge of the first die to the first optical waveguide. The first trench is aligned with the first optical waveguide. A second die comprises a second optical waveguide and a second trench extending from a second edge of the second die to the second optical waveguide. The second trench is aligned with the second optical waveguide. An optical wire comprising an uncladded glass fiber comprises a first terminal portion extending within the first trench and a second terminal portion extending within the second trench. The first terminal portion is aligned with the first optical waveguide and the second terminal portion is aligned with the second optical waveguide.

A method of manufacturing a tuned optical fiber includes providing a first preform from a set of like preforms each having substantially the same refractive index profile, including amount of axial variation relative to a target refractive index profile. The method includes drawing a reference optical fiber from the first preform and measuring a variation in an optical or physical property as a function of axial position. The method also includes drawing from a second preform from the set of like preforms the tuned optical fiber. The drawing includes using a time-varying tension that reduces the amount of variation of the optical or physical property of interest. The time-varying tension is defined by an amount of axial stress imparted to the tuned fiber needed to alter the refractive index profile and the at least one optical or physical property based on a stress-optic effect.

An optical fiber coating die assembly is provided. The optical fiber coating die assembly includes a housing defining a guide chamber having an inlet for receiving optical fiber and an outlet, a guide die located at the outlet of the guide chamber, and a sizing die. The optical fiber coating die assembly also includes a coating applicator disposed between the guide die and the sizing die, and a tube operatively coupled to the inlet of the guide chamber and axially aligned with the chamber to receive the optical fiber fed into the guide chamber and provide a barrier to air flow.

An optical fiber coating die assembly is provided. The optical fiber coating die assembly includes a housing defining a guide chamber having an inlet for receiving optical fiber and an outlet, a guide die located at the outlet of the guide chamber, and a sizing die. The optical fiber coating die assembly also includes a coating applicator disposed between the guide die and the sizing die, and a tube operatively coupled to the inlet of the guide chamber and axially aligned with the chamber to receive the optical fiber fed into the guide chamber and provide a barrier to air flow.

The optical fiber manufacturing method includes: a drawing step of drawing a glass fiber from an optical fiber base material with a melted tip; a passing step of passing the glass fiber through a fiber passage formed in a die; and a resin coating step of forming a resin layer on the outer periphery of the glass fiber by supplying a resin to the fiber passage through a flow path communicating with the fiber passage formed in the die. In the resin coating step, a temperature of the resin is controlled so that a supply pressure of the resin to the fiber passage becomes a value in a predetermined range.

The optical fiber manufacturing method includes: a drawing step of drawing a glass fiber from an optical fiber base material with a melted tip; a passing step of passing the glass fiber through a fiber passage formed in a die; and a resin coating step of forming a resin layer on the outer periphery of the glass fiber by supplying a resin to the fiber passage through a flow path communicating with the fiber passage formed in the die. In the resin coating step, a temperature of the resin is controlled so that a supply pressure of the resin to the fiber passage becomes a value in a predetermined range.

A method for producing a glass filament, the method including: irradiating a raw yarn containing 70 wt % or more of SiO.sub.2 and having a raw yarn diameter of 100 to 2,000 μm with laser light having a wavelength of 0.7 to 100 μm to heat the raw yarn; and stretching the raw yarn to obtain the glass filament having a hydroxyl group (Si—OH) content of 300 ppm or less and a diameter of 1 to 20 μm.

A method for producing a glass filament, the method including: irradiating a raw yarn containing 70 wt % or more of SiO.sub.2 and having a raw yarn diameter of 100 to 2,000 μm with laser light having a wavelength of 0.7 to 100 μm to heat the raw yarn; and stretching the raw yarn to obtain the glass filament having a hydroxyl group (Si—OH) content of 300 ppm or less and a diameter of 1 to 20 μm.