Abstract:
An optoelectronic micromodule (201) comprises an optoelectronic component (204), which is fixed on a main carrier (202) and can emit light in an emission direction (206) directed parallel to a main carrier surface (203) of the main carrier (202), and a radiation variation unit (208), which is arranged in the emission direction (206) and fixed to an auxiliary carrier (209), which has an auxiliary carrier surface (210) which is oriented plane-parallel to the main carrier surface (203) and is in touching contact with the latter. The auxiliary carrier (209) is arranged such that it is shiftable plane-parallel to the auxiliary carrier surface (210) relative to the emission direction (206), thereby enabling a two-dimensional adjustment of the radiation variation unit (208). The radiation variation unit (208) can be adjusted both parallel and perpendicularly to the emission direction (206).
Abstract:
The invention relates to a module for multiplexing and/or demultiplexing optical signals, having at least one wavelength-selective filter for multiplexing or demultiplexing into the module optical signals which have been coupled in or out, light beams of at least one optical channel respectively striking a wavelength-selective filter at a specific angle of incidence and, in the process, being separated from the light beams of other optical channels or being combined therewith. According to the invention, at least one wavelength-selective filter (Fi) can be set with reference to the angle of incidence of the light beams. The invention makes available a module in the case of which the center wavelength of a filter can be set precisely on the basis of the adjustability of the angle of incidence and, moreover, a specific filter (Fi) can also be used for several wavelengths.
Abstract:
A device, which provides a high positioning precision and good coupling efficiency for producing an optical coupling between a plurality of first optical waveguides having one spot diameter and a plurality of second optical waveguides having a different spot diameter, comprises optical lenses and a plate arranged between the end faces of the first and second waveguides lying opposite to one another, the plate has one flat surface facing toward the first waveguides and a second flat surface facing toward the second waveguides, the plate having an arrangement for positioning an optical lens between each pair of waveguides. The optical lenses may be planar lenses formed on a flat surface of the plate or may be spherical lenses held in conical depressions on one of the surfaces of the plate. In one embodiment, the plate has depressions on both sides, which may receive spherical lenses. In the arrangement with the planar lenses, the opposite side may be free of depressions or have depressions for receiving optical fibers forming one of the groups of waveguides.
Abstract:
Method and apparatus for acquiring information using a relative phase deviation between the phase of a receipt signal of an optical homodyne receiver and the phase of an optical signal of a local oscillator of the receiver. Previously information had to be taken from a control signal included in a larger DC signal. The compensation for the DC component is difficult. So as to make this unnecessary, the frequency F.sub.Lo of the local oscillator is shifted by the frequency f.sub.H of a defined auxiliary carrier and the frequency-shifted optical signal is then superimposed on the optical receive signal and is detected. The detected signal is band-pass-filtered and is shifted to the baseband frequency by mixing with the same auxiliary carrier and then is low-passed filtered. The DC voltage obtained indicates the relative phase relationship between the local oscillator and the receive signal based on the sign of the signal and indicates the absolute phase deviation by its amplitude. The DC voltage signal can then be supplied to a control loop so as to make this signal as small as possible.
Abstract:
A controllable directional coupler comprises two optical waveguides on the surface of a substrate of electrooptical material, the waveguides extending parallel for a predetermined distance. The coupler also comprises a control electrode structure including a pair of control electrodes formed on the surface of the substrate and covering the two parallel waveguides along their lengths. In order to achieve low control voltage and a low coupling loss, in the case of butt coupling to a monomode fiber, in the interstice between the two optical waveguides, the refractive index of the substrate is reduced to a specific depth of the substrate at which the coupling intensity becomes largely independent of the near-field expansion in the waveguides.
Abstract:
A distributor for optical signals characterized by a waveguide structure disposed on the substrate. The waveguide structure has an input and a plurality of output ends with a tree-like branching structure having at least one branching point with two curved branching sections extending therefrom. Each of the curved branching sections has a radius of curvature great enough so that the guiding of optical signals in the branching section is not impaired.
Abstract:
A device for coupling an incoming light conducting fiber cable to an outgoing light conducting fiber cable characterized by a pair of housings connected together and each receiving a holder which holders center the fibers in one cable in relation to the fibers of the cable which is centered by the other holder. The improvement comprises the holder includes a substrate having a first guide foil disposed on one surface and a second guide foil disposed on the opposite surface, each of said foils having aligned channels for receiving light conducting fibers with the channels of the first foil in a direction leading away from the substrate possessing a cross-sectional profile, decreasing to the diameter of the light conducting fibers. In one embodiment of the invention, the channels are apertures which are aligned with apertures or bores in the substrate and a modification of this embodiment includes forming the first guide foil of a plurality of layers with each layer having apertures converging towards the outer surface thereof with the outermost layer having the smallest aperture. In another embodiment, the channels in the first and second guide foils are arranged as perpendicular channels which extend beyond the peripheral surface of the substrate and, preferably, the light conducting fibers received in the channels are secured on the periphery of the substrate.
Abstract:
A method of producing a light conductor structure having a pair of light conductors embedded in a substrate and electrodes arranged between the light conductors which structure is particularly adapted to be used as an electrically controllable coupler, characterized by providing a substrate, applying a strip of diffusion material on the substrate at the location of each of the light conductors, covering each of the strips of diffusion material with a protective layer of material, applying a metal layer to the substrate and the layer of protective material, removing the protective layer and the metal layer supported thereon, and then diffusing the diffusion material into the substrate by heating to a desired temperature. The embodiments of the method include applying an adhesive layer prior to applying the metal layer to facilitate the attachment of the metal layer on the substrate and applying a dielectric layer prior to applying either the metal layer or the adhesive layer to prevent diffusion of either the adhesive or metal layer into the substrate during the diffusion process.
Abstract:
A coupling device for coupling light waves between optical components for signal transmission including a developed, transparent, negative photoresist layer interposed between the optical components to be coupled.
Abstract:
The aim of the invention is to adjust the operating point of a laser that can be modulated by a data signal. The operating point of the laser is adjusted by regulating a direct current flowing through the laser; whereby said direct current correlates with the optical characteristics of the laser. In order to carry out said adjustment, the direct current is controlled above an alterable threshold current. A differential current defined from the difference between the direct current and the threshold current or a variable correlating with the differential current is adjusted to a constant value or one that is solely dependent on temperature for the adjustment of said operating point.