Optical fiber (1) made of a photosensitive glass and with a rectangular cross section, wherein the radius of curvature of a corner of the rectangular cross section is smaller than 100 microns.

Optical fiber (1) made of a photosensitive glass and with a rectangular cross section, wherein the radius of curvature of a corner of the rectangular cross section is smaller than 100 microns.

Apparatuses relate generally to a fiber optic cable. In such an apparatus, a housing has a channel or bore for receipt of a portion of the fiber optic cable having a fiber optic sensor. An acoustic interface layer is coupled to a surface of the housing to reduce stress wave coupling loss at an interface between the fiber optic sensor and a host structure surface. In another such apparatus, a patch structure is for a fiber optic cable coupled to a fiber optic voltage conditioner. In yet another such apparatus, a fiber optic voltage conditioner is coupled for optical communication to a fiber optic cable having a Fiber Bragg Grating sensor. The fiber optic voltage conditioner includes a tunable light source having a broadband light source or a gain medium configured to provide a narrowband light signal from a broadband light signal for providing to the fiber optic cable.

The present invention relates to the use of dopants for polymer optical fibers or polymer waveguides containing the dopants, sensors in the polymer optical fibers or polymer waveguides, which may be used in the biomedical industry for the measurement of different physiological and physical variables.

The present invention relates to the use of dopants for polymer optical fibres or polymer waveguides containing the dopants, sensors in the polymer optical fibres or polymer waveguides, which may be used in the biomedical industry for the measurement of different physiological and physical variables.

A technique is described for fabricating one or more optical devices in a carbon-coated optical fiber. A photosensitive optical fiber is provided having a hermetic carbon coating. Further provided is a laser having a beam output that is configured to inscribe one or more refractive index modulations into the optical fiber through the hermetic carbon layer while leaving the hermetic carbon layer intact. The laser is used to inscribe one or more optical devices into the optical fiber through the hermetic carbon layer.

An optical sensor includes an optical fiber inscribed with densely-overlapping, chirped-frequency fiber Bragg gratings at multiple locations along the optical fiber such that light reflected from a location on the optical fiber is reflected at multiple frequencies in a range of frequencies. An entire length of the optical sensor includes densely-overlapping, chirped-frequency fiber Bragg gratings. At least two of the densely-overlapping, chirped-frequency fiber Bragg gratings overlap at every measurement point along the entire length of the optical sensor. An optical sensing system uses the optical sensor. A method of making the optical sensor is described.