Abstract: According to embodiments of the present invention, a fiber preform or an optical fiber is provided. The fiber preform or the optical fiber includes a core region having a plurality of cores, wherein two cores of the plurality of cores are bridged by an air gap, and a cladding arrangement including a first cladding region having a plurality of structures surrounding the core region, and a second cladding region in between the core region and the first cladding region, the second cladding region having a plurality of tubes, wherein at least one split is defined in the second cladding region. According to further embodiments of the present invention, a method for forming the fiber preform, a method for forming the optical fiber, an optical coupler having the optical fiber, an optical combiner having the optical fiber, and an optical apparatus having the optical fiber are also provided.

Abstract: According to embodiments of the present invention, a fiber preform or an optical fiber is provided. The fiber preform or the optical fiber includes a core region having a plurality of cores, wherein two cores of the plurality of cores are bridged by an air gap, and a cladding arrangement including a first cladding region having a plurality of structures surrounding the core region, and a second cladding region in between the core region and the first cladding region, the second cladding region having a plurality of tubes, wherein at least one split is defined in the second cladding region. According to further embodiments of the present invention, a method for forming the fiber preform, a method for forming the optical fiber, an optical coupler having the optical fiber, an optical combiner having the optical fiber, and an optical apparatus having the optical fiber are also provided.

Abstract: According to embodiments of the present invention, a fiber preform or an optical fiber is provided. The fiber preform or the optical fiber includes a core region, and a cladding arrangement comprising a first cladding region comprising a plurality of rods entirely surrounding the core region, and a second cladding region in between the core region and the first cladding region, the second cladding region comprising a plurality of tubes, wherein a plurality of splits are defined in the second cladding region. According to further embodiments of the present invention, a method for forming a fiber preform and a method for forming an optical fiber are also provided.

Abstract: According to embodiments of the present invention, a lighting apparatus is provided. The lighting apparatus includes at least one light source configured to provide a source light, an optical waveguide optically coupled to the at least one light source, the optical waveguide having at least one input region through which the source light enters the optical waveguide for propagation within the optical waveguide, and a plurality of light interacting structures arranged within the optical waveguide, the plurality of light interacting structures adapted to interact with the source light to provide an illumination light emitted from the optical waveguide to an ambient environment, wherein a concentration of the plurality of light interacting structures increases, along a length portion of the optical waveguide, in a direction away from the at least one input region.

Abstract: According to embodiments of the present invention, a lighting apparatus is provided. The lighting apparatus includes at least one light source configured to provide a source light, an optical waveguide optically coupled to the at least one light source, the optical waveguide having at least one input region through which the source light enters the optical waveguide for propagation within the optical waveguide, and a plurality of light interacting structures arranged within the optical waveguide, the plurality of light interacting structures adapted to interact with the source light to provide an illumination light emitted from the optical waveguide to an ambient environment, wherein a concentration of the plurality of light interacting structures increases, along a length portion of the optical waveguide, in a direction away from the at least one input region.