Abstract:
An optogenetic probe, an optogenetic system, and a method for fabricating an optogenetic probe are provided. The optogenetic probe has a proximal and a distal end, and includes an elongated body made of a body glass material and extending longitudinally between the proximal and distal ends. The optogenetic probe also includes at least one optical channel, each including an optical channel glass material having a refractive index larger than a refractive index of the body glass material, so as to guide light therealong. The optogenetic probes also includes at least one electrical channel, each including an electrical channel structure having an electrical conductivity larger than the electrical conductivity of the body glass material, so as to conduct electricity therealong. The optogenetic probe further includes at least one fluidic channel, each adapted for transporting fluid therealong. Each optical, electrical and fluidic channel extends longitudinally within the elongated body.
Abstract:
A composite waveguide comprising a central core and at least one side core helically wound about said central core and in optical proximity to said central core.
Abstract:
Optical waveguide cores having refractive index profiles that vary angularly about a propagation axis of the core can provide single-mode operation with larger core diameters than conventional waveguides. In one representative embodiment, an optical waveguide comprises a core that extends along a propagation axis and has a refractive index profile that varies angularly about the propagation axis. The optical waveguide can also comprise a cladding disposed about the core and extending along the propagation axis. The refractive index profile of the core can vary angularly along a length of the propagation axis.
Abstract:
An optical fiber (10) consisting of a core area (1) and a clad area (2) surrounding the core area (1), a plurality of areas consisting of sub-media (4) each having a refractive index different from that of a main medium (3) constituting the clad area (2) being provided in the main medium (3), wherein the areas consisting of these sub-media (4) are disposed in specified one or a plurality of toroidal areas (21-2m), and the centers of the areas consisting of the sub-media (4) within respective toroidal areas (21-2m) are respectively disposed on the same circumferences having the centers at the center of the core.
Abstract:
The invention relates to a tapered optical fiber and a method and drawing tower for producing such an optical fiber. The tapered optical fiber comprising a core region that is capable of guiding light along a longitudinal axis of said optical fiber and a cladding region surrounding said core region. The optical fiber comprises a tapered section arranged between a first longitudinal position and a second longitudinal position, said tapered section comprising a first taper section having a first length, L 1 , over which the optical fiber is tapered down to a taper waist, and a second taper section having a second length, L 2 , over which said optical fiber is tapered up.
Abstract:
A section ofactive optical fiber (11) which comprises an active core (1),an inner cladding layer (2) andan outer cladding layer (3).The diameter of said core (1) and the thickness of said inner cladding (2) change gradually along the length of said section of active optical fiber (11). This formsa tapered longitudinal profile enabling a continuous mode conversion process alongthe length of the section of fiber (11). The method for fabricating a section of tapered active optical fibercomprises the steps of fabricating a preform for drawing active optical fiber from said preform,installing said preform into a drawing tower, drawing optical fiber in said drawing tower and altering at least one of the two parameters including the take-off preform speed and the take-up fiber speed during drawing of the optical fiber.
Abstract:
An optical waveguide fiber suitable for making a spliced connection between two dissimilar optical waveguide fibers and the method of making the fiber.
Abstract:
An optical fiber (10) having section (A) of first kind where the chromatic dispersion in a predetermined wavelength band is greater than a predetermined positive value x and the chromatic dispersion slope is negative and section (B) of second kind where the chromatic dispersion in the same wavelength band is smaller than -x and the chromatic dispersion slope is positive, or an optical fiber where the chromatic dispersion in a predetermined wavelength band is greater than the predetermined positive value x and the chromatic dispersion slope is negative.
Abstract:
A method for producing an optical fiber is provided. The method includes the steps of drawing an optical fiber from a heated glass source in a furnace and introducing index perturbations to the optical fiber via a plurality of perturbation sources arranged at a plurality of different azimuthal locations. The index perturbations are introduced synchronously at different locations along the axial length of the fiber by the plurality of perturbation sources in a generally helical pattern on the outside surface of the fiber in one embodiment. According to another embodiment, the index perturbations are introduced by the plurality of perturbation sources at different frequencies.
Abstract:
A section of active optical fiber (11) which comprises an active core (1), an inner cladding layer (2) and an outer cladding layer (3). The diameter of said core (1) and the thickness of said inner cladding (2) change gradually along the length of said section of active optical fiber (11). This forms a tapered longitudinal profile enabling a continuous mode conversion process along the length of the section of fiber (11). The method for fabricating a section of tapered active optical fiber comprises the steps of fabricating a preform for drawing active optical fiber from said preform, installing said preform into a drawing tower, drawing optical fiber in said drawing tower and altering at least one of the two parameters including the take-off preform speed and the take-up fiber speed during drawing of the optical fiber.