Abstract: An optical fiber fusion splicer includes a discharge unit for producing an electric discharge to fusion splice optical fibers and a pressure sensor for producing a pressure detection signal representing the surrounding atmospheric pressure. In response to the pressure detection signal the discharge is controlled by a control unit so that a substantially optimum discharge current for the fusion splicing is provided to the discharge unit. The discharge control unit includes an adjusting unit for producing a discharge current adjusting signal, a control signal generating unit for generating a control signal on the basis of both the pressure detection signal and the discharge current adjusting signal, and a discharge current control unit for controlling the discharge current in response to the control signal.

Abstract: In a method of stringing an overhead conductor incorporating an optical fibre ribbon, at least two lengths of overhead conductor, each having a bore within and extending along the length of the conductor, are electrically and mechanically connected end to end in such a way that the bores of interconnected conductor lengths are smoothly continuous and the conductor consisting of the interconnected conductor lengths is strung between a plurality of towers. After the conductor has been strung, the optical fibre ribbon is introduced into and propelled along the bore of the suspended conductor by fluid drag of a gaseous medium.

Abstract: Disclosed is an information detecting system of scanning type which comprises a substrate formed with an optical waveguide layer, a laser oscillator emitting a laser beam, a SAW type beam deflecting device formed on the optical waveguide layer, a beam irradiating section irradiating a specimen with the laser beam derived from the optical waveguide layer, a controller controlling the frequency of a high-frequency voltage applied to the SAW type beam deflecting device so as to scan the specimen with the laser beam directed from the beam irradiating section, and a detecting section detecting the position and/or the intensity of the laser beam scanning the specimen with respect to the SAW control signal controlled by the controller.

Abstract: A DFB laser (2) is coupled to a monomode line fiber (14) via an isolator constituted by a Faraday rotator crystal (4) and a polarizing fiber (10) which is welded to a fiber to be coupled (14). A focusing lens (8) is integrated in an intermediate block including the rotator crystal (4) and a permanent magnet (6). The invention is particularly suitable for making light-emitting heads for use in optical fiber telecommunications systems.

Abstract: A heat-resistant plastic optical fiber having a concentric three-layered structure comprising a core layer, a sheath layer and a protective layer, wherein the polymer constituting the sheath layer is a copolymer comprising 30 to 80 mole % of a fluorodioxole represented by the general formula: ##STR1## wherein R and R' are each a fluorine atom or a trifluoromethyl group, and 70 to 20 mole % of at least one other comonomer. Also, a process for the production of the heat-resistant plastic optical fiber comprising spinning a core-forming polymer, a sheath-forming polymer and a protective layer-forming polymer by a three-layered conjugate spinning process.

Abstract: A fiber optical Y-junction device includes a l.times.N optical fiber coupler connected to N fiber optic amplifier module structures constructed from a doped optical fiber. When the optical Y-junction structure contains a fiber optic amplifier, the fiber optical Y-junction device is operable as either a modulator or lossless power divider. A nonblocking optical switch is constructed by coupling M.times.l optical fiber couplers to the outputs of the fiber optic amplifier module structures utilizing the fiber optical Y-junction.

Abstract: An optical circuit element for processing single mode light. The element is of the type that includes input and output waveguides that communicate with an intermediate waveguide network. The input and output waveguides are designed to support only the fundamental mode of light throughout a predetermined optical wavelength range while the waveguides of the intermediate waveguide network can support higher order modes. By maintaining adiabatic optical path transitions throughout the element, cross-coupling between the fundamental and higher order modes is avoided so that broad wavelength range single mode signal processing is achieved.

Abstract: A transceiver package (22) having a receptacle adapted to receive a connector (12) terminating a cable (18) having optical fibers; key element means (56) for being of varied width to fit a corresponding groove (13) of said connector (12) respective ports (70, 71) for mating with said connector (12); and functional parts of a transceiver including: a transmitter active device (191) and a receiver active device (190), integrated circuit substrate means (112), and posts (122, 124).

Abstract: In a device for injecting the light energy of a laser beam into a multimode fibre-optic optical waveguide (2) a small part of the light emerging from the end face of the optical waveguide (2) is projected through a beam splitting cube (7) and a reproducing lens (21) onto a display screen (1), so that an image (24) of the end face of the optical waveguide (2) can be observed on the display screen (1). The arrangement is such that the system is correctly focused only when the distance between the optical waveguide (2) and a focusing point of the laser beam (12) reaches an intended value. The light spot of the laser beam on the end face of the optical waveguide (2) is clearly visible on the display screen (1) so than an optimum positioning and adjustment can be readily effected.

Abstract: An optical coupler couples optical fibers carrying high energy signals. The coupler includes an adapter thaat interfaces two optical connectors. The optical connectors are positioned within the adapter to bring two optical fibers into optical communication. The optical connectors fit into the adapter in a manner than imposes a gap of at least 0.001 inch and preferably between 0.003 to 0.005 inch between the optical fibers. Moreover, the optical connectors include bevelled ferrules that provide additional space at the interface between the fibers. The gap and the space between the fiber work in conjunction to minimize damage to the fibers.

Abstract: A spooled optical fibre data transmission line arrangement, for providing communication between a missile and a missile launcher, comprising a rigid, fluid-tight, hollow body having first and second separable parts, the optical fibre being carried by one part and connected at one end via an opto-electric transducer to a terminal extending through the wall of that one part, and the other end of the fiber being connected via a second opto-electric transducer to a terminal extending through the wall of the other part. The two separable parts suitably meet at a tear line and tags extend from adjacent the tear line on one part to the other part ot assist in complete rupture along the tear line when the fibre is required to be extended.

Abstract: A fiberoptic lamp includes one or more optical fibers which include an emitting material so that optical energy given off by the emitting material will be transmitted by the fibers. The lamp has a housing which holds the fibers and an exciting device where energy given off by the exciting device causes the emitting material of the fibers to emit optical energy. This eliminates the need to channel the energy of the exciting device or the optical power emitted by the emitting material into apertures or ends of optical fibers and improves the efficiency of the lamp.

Abstract: A method, and device produced therewith, for improving the planarity of etched mirror facets 18 of integrated optic structures with non-planar stripe waveguides, such as ridge or groove diode lasers or passive devices such as modulators and switches. The curvature of the mirror facet surface at the edges of the waveguide due to topographical, lithographical and etch process effects, causes detrimental phase distortions, and is avoided by widening the waveguide end near the mirror surface thereby shifting the curved facet regions away from the light mode region to surface regions where curvature is not critical.

Abstract: A fiber-optic fabrication method is used for making the passive fiber-optic polarization control element capable of transforming an arbitrarily oriented linear polarization of light to a desired specific orientation, as so predicted by the super-mode theory. Central to this method is to locally heat and spin an anisotropic optical fiber with a variable spinning speed which is sufficiently high initially and which, as the micro-heater moves along the length of the fiber, drops slowly and monotonously to zero in a total length of about 10.sup.2 times the unspun-state beat length of the anisotropic fiber. Moreover, a linearly polarized light of definite, not unpredictable orientation, can be transformed simply with the aid of a half-wave plate, for example, to other desired SOPs (states of polarization) at the output.

Abstract: A wavelength selective structure is coupled to an adiabatic Y-coupler via a multimode section which supports both symmetric and antisymmetric modes. One single mode branch of the coupler converts guided light to a symmetric mode, whereas the other single mode branch converts guided light to an anti-symmetric mode. The structure, which includes a pair of single mode waveguide arms coupled to the common section and a reflection device (such as a grating or ROR) located in each arm, converts reflected light from a symmetric mode to an anti-symmetric mode and conversely. Applications described include a channel dropping filter and channel balancing apparatus for WDM systems, and a dispersion compensator for fiber optic systems.

Abstract: An apparatus for supporting and maintaining slack of fiber optic cable or the like in an aerial installation comprises an elongate channel member having an arcuate section and a plurality of linear sections for receiving the slack and means for securing the apparatus to a messenger cable support structure. Methods for supporting and maintaining the slack in two preferred embodiments are also disclosed.

Abstract: A pivot arm and a sliding shelf assembly for use in a cabinet housing and efficiently organizing fiber optic cables. The shelf assembly including a shelf movable into and out of the cabinet providing an area for storing a length of fiber optic cable and upon which cables may be joined. The pivot arm movably supports at least one cable routed to the shelf assembly and includes a radius maintaining support member for maintaining at least a predetermined radius in said cable when said shelf is moved into and out of the cabinet.

Abstract: A neodymium laser provides output at about 1.44 .mu.m, by selection of a neodymium doping level of between about 0.3 and 0.7N, preferably at 0.4N with reflectivity of the output mirror at about 90% for 1.44 .mu.m output. Selection of the reflectivity of the output mirror is adjusted to ensure that the excess of the gain over the absorption and transmission losses is maximized.

Abstract: A waveguide type optical detection apparatus which is provided on an optical integrated circuit that has a waveguide for transmitting a light from point to point through the waveguide, one or more sets of two adjacent photodetectors provided on the waveguide, and one or more light-insensitive areas existing between the two adjacent photodetectors of each set. The waveguide type optical detection apparatus includes a waveguide focusing part and one or more reflection parts, the waveguide focusing part being provided on the waveguide for allowing a light beam passing through the waveguide to be focused on each of the two adjacent photodetectors of each set, and the reflection parts provided adjacent to each of the light-insensitive areas for reflecting each of light beams sent from the waveguide focusing means forward each of the two adjacent photodetectors of each set so that the light beams are received by the photodetectors.

Abstract: The present invention relates to an optical fiber cable. In view of narrowing optical fiber cables, the spiral grooves to accommodate optical fiber cables are formed in the core loading material, in the longitudinal direction, by bundling high tensile strength synthetic resin fibers and covering the external circumference of the bundled material with a synthetic resin covering layer. Moreover, a method is disclosed for manufacturing an optical fiber cable which stably loads the optical fibers by holding the core loading material in order to eliminate deviation generated in the rotating direction around the core loading material on the occasion of loading fibers in the spiral grooves of core loading material.