Abstract:
In a method for producing an optoelectronic component, a laser chip is secured to a semiconductor wafer that is provided with metal structures. Thereafter, for each laser chip, one lens-coupling optical element that deflects the beam path of the laser chip is positioned on the semiconductor wafer. The laser chip is driven, and the space between the laser chip and the lens-coupling optical element is varied and set such that a predetermined beam condition with respect to the location of the optical image plane is met.
Abstract:
An external optical resonator for a semiconductor laser is composed of an optical directional coupler which can be formed as an integrated optical coupler with a short structural length that enables a free spectral range in the order of 100 GHz and enables the resonator and the system fiber to be coupled to the same end face of the laser. The resonator structure includes two optical waveguides with feedback means applied on the end faces of one of the waveguides and the other waveguide having one end face coupled to receive the output of the laser and the other end face of the other waveguide being coupled to the system fiber. The arrangement is particularly useful for tunable semiconductor lasers, particularly for heterodyne reception.
Abstract:
A method for generating an FSK-modulated optical signal with an optical two-filter FSK super-heterodyne receiver. The optical signal has two different polarization conditions that are orthogonal to one another. Due to orthogonal conditions, polarization-independent reception is possible. Synchronized polarization shifting occurs to generate a polarized modulated optical signal having alternating orthogonal polarization conditions. A delay stage for delaying the switching signal by one-half a clock period ensures accurate synchronization. The frequency shift of the FSK-modulated signal can be freely selected while maintaining excellent bandwidth characteristics and optimum sensitivity.
Abstract:
An arrangement has at least one, and preferably two, optical waveguides integrated on a substrate of electro-optical material, has at least one first electrode for each of the waveguides being applied on the substrate and separated from the waveguide and substrate by an insulating layer and has at least one second electrode for each of the waveguides. The second electrodes are connected to a constant voltage source, while the first electrodes are connected to a modulating voltage source. The constant voltage source applied to the secondary electrodes and the position of these electrodes relative to the waveguides determines an operating point for modulating light in the waveguides.
Abstract:
A branch element and method of making the element which distributes light signals from an incoming waveguide to outgoing waveguides characterized by a member having a pair of aligned waveguides received in channels with their end faces separated by a partially reflective layer and at least one branch waveguide engaging a portion of the surface of one of the aligned waveguides adjacent the reflective layer so that a light signal reflected by the layer is received in the branch waveguide. The method involves providing a single member having grooves for receiving each of the waveguides, cutting the member into two parts, polishing the cut edges to form polished surfaces with one of the surfaces being provided with the partially reflecting layer and joining the waveguide together. The position for the cutting is selected to be in a plane removed from the groove for the branch waveguide so that after polishing, the reflector is positioned in the desired relationship to the branch waveguide.
Abstract:
An optical unit having at least one longitudinal side coupling zone characterized by the unit comprising at least one glass fiber having a glass core with a glass cladding layer surrounding the core with a step in the index of refraction from a greater to a lower value occurring at the junction between the glass core and cladding layer, the cross section of the glass fiber remaining uniform along the entire length and the core having at least one constriction to form the longitudinal coupling zone. To form the optical unit, a device utilizing a double crucible with a nozzle opening of the inner crucible being arranged to discharge into the nozzle opening of the outer crucible and provided with a means for regulating the flow therethrough is utilized. If the unit includes a plurality of optical fibers, these fibers may be individually formed and held together by an adhesive, the cladding of the fiber may be fused together or the unit may be formed jointly by utilizing a crucible having a plurality of nozzle openings for the inner crucible so that a continuous cladding layer is disposed around a plurality of cores.
Abstract:
An output/input coupler for multi-mode glass fibers characterized by a substrate, a main line having at least one flat surface, and at least one branch line having one flat surface. The main line and branch line are arranged on the substrate with the flat surfaces being in spaced parallel facing relationship. Preferably, the main line has the square cross section and the flat surface of each branch line extends at an angle to the axis of the branch line so that the branch line has a wedge-shaped configuration in the plan view. A transparent material may be imposed in the space between the spaced parallel facing surfaces of the main and branch lines. This transparent material may be a liquid crystal material whose optical properties are changed by the application of an electric field created by a pair of electrodes which overlie the space between the parallel facing surfaces. The coupler is preferably formed by using a photolithographic process to form the coupler from a layer of photosensitive material which is disposed on the substrate. The photolithographic process includes exposing the photosensitive material utilizing a mask conforming to the shape and disposition of the main and branch lines, and developing the exposed material to leave the main and branch lines on the substrate.
Abstract:
An optical transmitter, a plurality of optical receivers and light wave guides operatively interconnecting the transmitter and receivers. In one embodiment the transmitter has a light emission surface in the order of a plurality of light wave guide cross-sections and the ends of the light wave guides thereadjacent are disposed in close side-by-side relation to one another and in close proximity to the light emission surface of the transmitter. In other embodiments the transmitter has a light emission surface in the order of a single light wave guide cross-section and interposed between the light emission surface and the light wave guides is an optics system.
Abstract:
A method for producing one-material optical fibers having at least one light conducting component supported in a protective sleeve or casing characterized by forming a one-piece blank having an open cross section by either pressing, continuous casting, chill casting or rolling, working the blank to close the cross section, heating the blank with the closed cross section to a suitable temperature for drawing and drawing the blank with the closed cross section into the one-material optical fiber having a closed cross section. Preferably, the protective casing during the step of forming is formed in two casing components having edges extending along the length of the blank and spaced apart and the step of working the blank forces the edges into engagement with each other to form a closed cross section.
Abstract:
A non-reciprocal component element for integrated optics characterized by a substrate having a pair of waveguides disposed thereon either in a stacked relationship or a closely spaced side-by-side relationship with one of the pair of waveguides being of a magneto-optic material having an index of refraction greater than the index of refraction of the substrate. The component has a magnetic field extending in the plane of the waveguides and perpendicular to the direction of propagation of the waves therein. The component is preferably provided with a pair of 3dB couplers and in one embodiment, the magnetic field is controllable so that the element acts as a modulator.