Abstract:
A time-sharing light distribution apparatus steers optical energy conducted thereto from a single source of optical energy supply to a plurality of remote locations or directly to the ambience. A light conducting rod receiving the optical energy at one end thereof includes an inclined surface for reflecting the optical energy to the ambience or to branch light conduction paths. A motor or like drive causes the light conducting rod to pivot or rotate about an axis thereof, thereby distributing the optical energy for desired applications such as photosynthesis.
Abstract:
A process is disclosed for making a tubular optical waveguide preform for a high-numerical-aperture optical waveguide which comprises an inner compression layer for enhanced preform strength. The process is characterised in that the tensile stress in a layer first applied to a cylindrical starting member is reduced by modifying the composition of the layer during its application in orderto reduce the thermal expansion coefficient of the layer to a value below that of at least one subsequently applied layer. An optical waveguide soot preform is also disclosed.
Abstract:
A sensor which provides an output signal representative of a parameter such as presure, includes a reflector (30), a lens (20) and a waveguide (11) which are relatively movable as a function of the parameter. Light from a light source (40) is transmitted by the waveguide (11) toward the reflector (30). The lens (20), which is positioned between the waveguide (11) and the reflector (30) directs the light from the waveguide (11) to the reflector (30) and focuses the reflected light proximate a receiving surface (58) of the waveguide. A sensor housing (15) supports the waveguide (11), lens (20) and reflector (30) so that a relative physical displacement between the waveguide (11), lens (20) and reflector (30) occurs which is responsive to the parameter. The light received by the waveguide (11) at its receiving surface (58) is a function of the relative physical displacement, and thus a function of the parameter. The waveguide (11) transmits the received light to a light detector (59) which produces an electrical output signal which is a function of the received light and therefore of the parameter.
Abstract:
A light source (10) coupled to a first fiber optic waveguide (14) which is coupled by a first directional coupler (22) and a second directional coupler (24) to a second waveguide (20). The first waveguide (14) has a phase modulator (60), a delay loop (62) and a polarization controller (68) therein to cause a differential delay time T on counterpropagating coherent light waves phase modulated at a frequency 1M. The first directional coupler (22) has one part connected to a photodector (28) and the second directional coupler (24) as a probe (20D) coupled to the first fiber (14) and the second fiber (20). The probe directs light toward a surface (18) whereupon the counterpropagating waves are shifted in phase by an amount proportional to the amplitude of displacement of the surface (18).
Abstract:
A molded fiber optical keyboard having a molded fiber optic keys wherein a matrix of elongated, parallel bundles of molded fiber optical assemblies (12, 14) are arranged into separate, planar layers disposed at right angles to one another. The individual light conductors (16) of each bundle of molded fiber optics are stair-stepped in length relative to one another with the intersections of similar length conductors in each one of the two layers separated a sufficient distance so as to accommodate a fiber optic switch member. The switch member is provided with an angularly disposed through aperture reaching from one vertical side surface to the opposite side vertical side surface and is adapted to couple light from one planar layer of light conductors to the other planar layer of light conductors or to block light completely from one to the other layer of light conductors. A fiber optic strand or cable can be substituted for the angular aperture in the key switch member.
Abstract:
Optical fibers composed of a core component comprising polysiloxane of a crosslinked structure and a clad component formed around said core component and comprising a substantially transparent organic polymer having a refractive index lower than that of the core by 0.01 or more, and a process for producing the optical fibers by filling the hollow clad with crosslinkable liquid silicone and crosslinking the liquid silicone in a static state. The optical fibers have excellent flexibility, heat resistance, freeze resistance, chemical resistance, and vibration resistance, and can be used in severe environments.
Abstract:
Dans un appareil moulé de commutation par transmission d'ondes optiques, un élément plastique (10) plat, planaire et conducteur de lumière ayant un indice de réfraction (N2 est prémoulé avec des rainures ou canaux (18, 22) agencés orthogonalement à son endroit et à son envers. Chacune de ces rainures ou canaux est remplie par moulage avec un plastique conducteur de lumière ayant un indice de réfraction N1(N1>N2), en formant effectivement des canaux conducteurs de lumière ou guides d'ondes antérieurs et postérieurs perpendiculaires les uns par rapport aux autres sur l'élément planaire plat. Un branchement doucement courbé (24, 26) est moulé dans la région d'intersection entre chaque colonne et rangée de guides d'ondes, une ouverture ou passage transversal étant formé adjacent à chaque intersection. Les branchements de l'endroit de l'élément planaire sont recourbés vers le bas et rencontrent les branchements recourbés vers le haut de l'envers de l'élément planaire. Des organes (38) d'interruption et de transmission de lumière sont disposés dans les ouvertures respectives et sont actionnés pour interrompre le passage de la lumière des générateurs de lumière aux récepteurs de lumière.
Abstract:
Increased mode dispersion in graded-index multimode optical fibers due to defects in the index profile can be significantly reduced if the average defect is caused to varnish over the length of the fiber. For fibers with non-optimum (Alpha)-values, minimum impulse response can be achieved when (Alpha) varies along the fiber, such that the average value of (Alpha) is equal to (Alpha)opt. The effect of fluctuations superimposed upon the index profile are minimized by introducing an odd number of phase reversals in the fluctuations equally spaced along the fiber.