A head-up display, such as found in smart glasses, may include a light source configured to project light for display. A heads-up display may include a polymer aerogel optical waveguide configured to receive the light from the light source, guide the received light to an area in front of an eye of a user, and project the light to the eye of the user. The polymer aerogel optical waveguide can include a core portion made from a glass having a relatively high index of refraction and a cladding portion made from a polymer aerogel having a relatively low index of refraction so that light is guided in the core portion by total internal reflection at an interface between the core portion and the cladding portion.

A method of fabricating a multi-core polymer optical fibre comprises arranging optical fibre preforms in a stack, the optical fibre preforms each comprising a polymer core and polymer cladding surrounding the polymer core; and drawing and bonding the stack to form the multi-core polymer optical fibre. Any contaminants or impurities which collect on outer surfaces of the preforms may be confined to boundaries between the preforms, which may avoid attenuation of signals passed through the cores while at the same time reducing crosstalk between cores of the final manufactured fibre. Also provided is a multi-core polymer optical fibre obtainable by the method.

Electro-optic (EO) devices having an EO polymer core comprising a first host polymer and a first nonlinear optical chromophore (NLOC); and a cladding comprising a second host polymer and a second NLOC, and methods of preparing the same; wherein the first NLOC has a first bridge covalently bonded to an electron-accepting group and an electron-donating group; wherein the second NLOC has a second bridge covalently bonded to an electron-accepting group and an electron-donating group; and wherein the second bridge is less conjugated than the first bridge such that the cladding has an index of refraction that is less than that of the EO polymer core, and wherein the second NLOC is present in the second host polymer in a concentration such that the cladding has a conductivity equal to or greater than at least 10% of the conductivity of the EO polymer core at a poling temperature.

Polymer optical fibers (POFs) including a polyamide core are described herein. The polyamide cores generally include one or more nylon polymers and are microcrystalline. The described POFs can have an operating temperature exceeding 150? C. and a calculated numerical aperture of 0.6 or greater.

Polymer optical fibers (POFs) including a polyamide core are described herein. The polyamide cores generally include one or more nylon polymers and are microcrystalline. The described POFs can have an operating temperature exceeding 150? C. and a calculated numerical aperture of 0.6 or greater.

Coated optical fibers and uses of such fibers as sensors in high temperature and/or high pressure environments. The coated optical fiber has improved sensing properties at elevated pressure and/or temperature, such as enhanced acoustic sensitivity and/or a reduced loss in acoustic sensitivity. The use of the coated optical fibers in various sensing applications that require operation under elevated pressure and/or temperature, such as, acoustic sensors for various geological, security, military, aerospace, marine, and oil and gas applications are also provided.

A resin optical waveguide containing a core, an under cladding and an over cladding having refractive indices lower than that of the core, in which the resin optical waveguide has, at one end side of, a core-exposed section at which the over cladding is not present and the core and the under cladding nearby the core are exposed and, of the under cladding, a portion corresponding to the core-exposed section has a first layer and a second layer that satisfy a certain condition.

Electro-optic (EO) devices having an EO polymer core comprising a first host polymer and a first nonlinear optical chromophore (NLOC); and a cladding comprising a second host polymer and a second NLOC, and methods of preparing the same; wherein the first NLOC has a first bridge covalently bonded to an electron-accepting group and an electron-donating group; wherein the second NLOC has a second bridge covalently bonded to an electron-accepting group and an electron-donating group; and wherein the second bridge is less conjugated than the first bridge such that the cladding has an index of refraction that is less than that of the EO polymer core, and wherein the second NLOC is present in the second host polymer in a concentration such that the cladding has a conductivity equal to or greater than at least 10% of the conductivity of the EO polymer core at a poling temperature.

Coated optical fibers and uses of such fibers as sensors in high temperature and/or high pressure environments. The coated optical fiber has improved sensing properties at elevated pressure and/or temperature, such as enhanced acoustic sensitivity and/or a reduced loss in acoustic sensitivity. The use of the coated optical fibers in various sensing applications that require operation under elevated pressure and/or temperature, such as, acoustic sensors for various geological, security, military, aerospace, marine, and oil and gas applications are also provided.

An illumination structure of the present invention is an illumination structure that lights a sunshade or a glass roof. The illumination structure includes: a frame-like first bracket coupled to a headliner along the circumferential edge of a headliner opening for reinforcing the headliner opening; a frame-like second bracket coupled to the first bracket so as to be overlaid on the back side of the first bracket for reinforcing the headliner opening in cooperation with the first bracket; and a light emitter held between the first bracket and the second bracket. Light from the light emitter is emitted through a gap between the first bracket and the second bracket.