Abstract:
A traveling wave optical modulator includes an optical waveguide substrate made of an electro-optic and ferrodielectric single crystal in the form of an X- or Y-orientation plate_and comprising a thicker portion having a larger thickness and a thinner portion having a smaller thickness; first and second branched optical waveguide portions formed at least on the thinner portion of the optical waveguide substrate; a set of electrodes provided on at least the thinner portion of the substrate and adapted for applying voltage to the first and second optical waveguide portions to modulate a light propagating the optical waveguide portions; and a buffer layer provided to cover a part of the optical waveguide portions at the thinner portion of the substrate, the electrodes crossing on the buffer layer.
Abstract:
A wideband semiconductor electro-absorption optical modulator including a semiconductor core shorter in absorption-peak wavelength than a wavelength of optical signal, and an electrode for applying an electric signal to absorb the optical signal by shifting the absorption-peak wavelength to a long wavelength region when a voltage is applied, wherein an electric signal input port and an electric signal output port are disposed so that the electrode is constructed in the form of a traveling-wave electrode, and a total thickness of non-doped layers including the semiconductor core is reduced to decrease a driving voltage. Degradation of optical modulation bandwidth and reflection characteristics of the electric signal caused by mismatching of characteristic impedance to an outer circuit are reduced by decreasing an interaction length of the electric signal and the optical signal. Further, mismatching of characteristic impedance is corrected by adjusting a doping concentration of a p-type or n-type doped layer located above or beneath the semiconductor core.
Abstract:
Velocity-matched electrodes that are sufficiently index-matched to use in linearized directional-coupler modulators are provided by placing a low dielectric constant material layer over the travelling-wave modulator electrodes, followed by a metal layer that is electrically connected to a ground electrode. The low dielectric constant layer between the grounded metal layer and the active electrode lowers the effective RF dielectric constant, which lowers the RF index of refraction. The RF index of refraction is matched to the optical index of refraction by controlling the thickness of the low dielectric constant layer, which is deposited with standard RF sputtering techniques that allow for precise control over the layer thickness. As a result, more precise velocity matching and greater reproducibility than with prior velocity matching techniques is achieved.
Abstract:
An optical modulation device includes a substrate, and a dielectric member having first and second surfaces opposite to each other. An optical waveguide extends on the first surface of the dielectric member and exhibits an electro-optical effect. First and second parallel lines are electromagnetically coupled with each other, and are of a microstrip line structure. The first line has a first line member and a ground plane, and the second line has a second line member and the ground plane. The first line member and the second line member extend on the first surface of the dielectric member and extend at opposite sides of the optical waveguide respectively. The ground plane extends between the substrate and the second surface of the dielectric member.
Abstract:
An optical modulation device includes a substrate. An optical waveguide is formed on the substrate. The optical waveguide exhibits an electro-optical effect. Parallel lines electromagnetically coupled with each other are formed on the substrate. The parallel lines extend at opposite sides of the optical waveguide respectively. The parallel lines are of a microstrip line structure. The parallel lines may alternatively be of a strip line structure or a coplanar line structure.
Abstract:
Methods, systems, and apparatus, including a photonic integrated circuit package, including a photonic integrated circuit chip, including multiple electrodes configured to receive the electrical signal, where at least one characteristics of a segment of the traveling wave active optical element is changed based on the electrical signal received by a corresponding electrode of the multiple electrodes; a ground electrode; and multiple bond contacts; and an interposer bonded to at least a portion of the photonic integrated circuit chip, the interposer including a conductive trace formed on a surface of the interposer, the conductive trace electrically coupled to a source of the electrical signal; a ground trace; and multiple conductive vias electrically coupled to the conductive trace, where each conductive via of the multiple conductive vias is bonded with a respective bond contact of the multiple bond contacts of the photonic integrated circuit chip.
Abstract:
The invention relates to an electro-optical modulator, comprising at least one optical waveguide (112, 122); an electrode arrangement (1) for applying a voltage across the optical waveguide (112, 122), wherein the electrode arrangement (1) comprises a first and a second electrical line (11, 12) and at least two terminating resistors (21, 22) terminating the first and the second electrical line (11, 12); and wherein the electrode arrangement (1) comprises at least one capacitive structure (31) that capacitively couples, but galvanically separates the two terminating resistors (21, 22). According to the invention, the capacitive structure (31) comprises at least two electrically conductive layers (313, 314, 316) physically arranged at a position between the first and the second electrical line (11, 12), wherein the at least two layers (313, 314, 316) are separated by at least one dielectric layer (315, 317).
Abstract:
L'invention concerne un composant, dispositif et système de modulation électro-optique amélioré pour augmenter la compacité, favoriser l'adaptation des ondes optiques et électriques, et un procédé de fabrication. Selon l'invention, un tel composant présente une architecture de guide d'onde (690) agencée pour que la longueur (L611) du trajet suivi par le flux lumineux présente, avec la longueur (L609) du trajet parcouru par le signal électrique de commande, une différence déterminée pour diminuer ou compenser la différence des vitesses (V609, V611) de propagation du flux lumineux et du signal électrique. En particulier, la zone de modulation comprend un trajet du flux lumineux s 'enroulant sur lui-même et traversant successivement au moins deux indentations émanant d'au moins deux de ces éléments de commande. Il présente ainsi une longueur supérieure à celle parcourue par le signal électrique, par exemple entre une première (R1a) et une deuxième (R2a) région d'interaction entre ce signal de commande et ce flux lumineux.
Abstract:
An apparatus (100) that comprises a planar electro-optic modulator (110) being located on a substrate (105) and including a waveguide (115) and electrical contacts (120), The waveguide that includes first and second substantially straight segments (122, 124) and a curved segment (126) that serially end-connects the first and second substantially straight segments such that light (130) travels in a substantially anti-paralIel manner in the first and second substantially straight segments. The electrical contacts being located adjacent the first and second substantially straight segments and being connected to produce constructively adding phase modulations on an optical carrier passing through the segments.