Abstract:
A flat connector with two parallel layers of bunched fibres (18) may easily be connected to a round multi-fibre optical cable (12) because it comprises a detachable connection element (R) and is provided with guiding means (G5, G6) with respect to the remainder of the connector (C), this element comprising a distributor (100, 101, 102) forming two distribution channels which bring progressively the whole of the fibres (18) coming out of the cable up to the two bunches arrangement. Application to telecommunication.
Abstract:
A sensor for measuring stress, temperature, pressure, sound, etc. comprising an optical fiber waveguide (24 of Fig. 6), a light source (22) which injects light (30) into one end of the waveguide, a deformer (27) contacting and deforming the waveguide to cause light to couple from originally excited modes to other modes, and an optical detector (29) to detect the change in light coupling caused by deformation of the waveguide.
Abstract:
This invention provides an optical converter suitable for use as the gain medium in lasers, optical amplifiers and other optical devices. The converter consists of at least one and preferable two or more optical converter elements which are sandwiched and separated by inactive dielectric layers. An optical pump beam may be passed to the active converter elements through an anti-reflection layer at one surface of the converter and a high reflection mirror may be provided at the opposite side of the converter to reflect the pump beam incident thereon back into the converter for a second pass. Each converter element has one or more absorber layers, at least one radiation layer receiving energy from the absorber layers and preferably outputting energy at a slightly different wavelength than the wavelength at which the absorber layers optimally absorb, and preferably at least one index-of-refraction compensator (IRC) layer which compensates for changes in index-of-refraction induced by the absorber and radiator layers to provide a low divergence far field optical intensity profile for the converter with no substantial side bands.
Abstract:
An optic displacement sensor (10) includes first and second optic circuits (120, 122) which optic circuits include bi-directional means for a light supply path to and a light return path from a light reflecting surface means (126). The first optic circuit is a reference signal circuit (120) and the second optic circuit is a measuring signal circuit (122). Means are provided for directing light into the light supply paths for the pair of optic circuits, and means are provided whereby the light from the light supply paths of the pair of optic circuits is received by light reflecting means (126) and at least partially reflected into the light return paths where it is detected. Further, the sensor includes means for adjusting the detected signal from one of the light return paths with respect to the detected light from the other light return path.
Abstract:
An optical wheel speed transducer (20) having a first optical fiber (48) for transmitting light pulses of constant frequency and intensity to an interrupter (44) rotating at an angular velocity proportional to the angular velocity of the wheel (2). The intensity of the light pulses is modulated by the interrupter (44) as a function of the angular velocity of the wheel (2). A second optical fiber (49) transmits the intensity modulated light pulses passing through the interrupter (44) to a light-sensitive device (64) which converts the intensity modulated light pulses to amplitude modulated electrical pulses. A demodulator (68) converts the amplitude modulated electrical pulses to an electrical signal that represents the angular velocity of the wheel (2). The transmission of the light pulses through the system is used to test the continuity of the system and to discriminate light emitted by external sources. A pair of collimating lenses (50 and 52) is used to focus the light pulses transmitted between the two optical fibers (48 and 49) across the interrupter (44).
Abstract:
A rotary optic switch for alternatively coupling a single light path to any one of a plurality of of other light paths upon the relative rotation of a light deflecting means. A first deflecting means (10) deflects light from a first radial path (12) to an axial path (14). A rotatable second light deflecting means (22) deflects light from the axial path parallel to the axis of rotation of the second light deflecting means to a second radial path (26) which moves responsive to the rotation of the second deflecting means (22). Light is supplied to the first radial light path by a first optic element (16). A plurality of second optic elements (28) are located circumaxially around the axis of rotation of the second light deflecting means (22) and can be alternatively optically coupled to the first optic element (16) by rotation of the second light deflecting means (22) aligning the second radial light path (26) with each of the second optic elements (28).
Abstract:
Optical fibers are coated with a radiation-curable liquid, polyethylenically unsaturated coating composition consisting essentially of an organic polysiloxane having from 2 to 6 reactive side chains each of which carry a functional group providing one reactive site which has been reacted to provide a single radiation-curable monoethylenically unsaturated side chain. There are about one such side chain for every 500 to 5,000 units of molecular weight. This provides a prime coating which has a modulus of elasticity at room temperature and at -60oC. below 3000.
Abstract:
A conventional coated optical fiber is formed with a buffer layer over the outer periphery of the fiber, and with a reinforced coating layer made of a reinforcing fiber material over the outer periphery of the buffer layer with a thermosetting resin impregnated into the reinforcing fiber material and hardened. In order to improve the mechanical characteristics such as the breakage of the reinforcing fiber material and longitudinal cracks in the reinforcing coating layer due to compression forces, torsion, and bending for the side surface, and secure high transmission characteristics for the optical fiber, a resin layer (4) made of a thermosetting or photocurable resin which is highly adhesive to the reinforcing coating layer and which has a large fracture elongation, without any fibrous material, is interposed between the buffer layer (3) over the outer periphery of the optical fiber (1) and the reinforcing coating layer (5).
Abstract:
A closed loop optical fiber interferometer is used in sensing a quantity, Q, by applying a time varying or modulated measure of, Q, asymmetrically to the closed loop (72) and detecting phase shift between two counterpropagating optical signals in the closed loop. The closed loop (72) can be used as the sensing element or a separate transducer (70) can develop a time varying signal which is then applied to the closed loop interferometer.
Abstract:
Un appareil commutateur photo-optique, utile par exemple dans des commutateurs de claviers, comprend une matrice orthogonale photo-polymérisée de canaux ou conducteurs de lumière horizontaux et verticaux intersectés (12, 14), formés de façon monolithique par exposition à la lumière ultra-violette sur un substrat plastique planaire et plat. Chaque intersection a un indice de refraction (N3) supérieur à celui du canal ou de la zone adjacente du substrat (N2). Un branchement ou connecteur de lumière recourbé relie les canaux verticaux aux canaux horizontaux du réseau. Les intersections des canaux sont disposées au-dessus d'un réseau de projections formées sur un substrat plat de montage, chaque projection étant située à une intersection respective des canaux de lumière horizontaux et verticaux. Un tampon de touche absorbant la lumière est agencé au-dessus de chaque intersection afin de transmettre la lumière passant dans le canal vers le tampon de touche. Une diminution relative de lumière indique que l'on a appuyé sur la touche.