Abstract: An electro-optic Mach-Zehnder modulator includes a first optical waveguide forming a first arm of the Mach-Zehnder modulator, and a second optical waveguide forming a second arm thereof. The first or second optical waveguide includes capacitive segments that are spaced apart from one another, each forming an electrical capacitor. A travelling wave electrode arrangement applies a voltage across the first or second optical waveguide. The travelling wave electrode arrangement includes waveguide electrodes arranged on the capacitive segments , an electrical line extending along a part of the first or second optical waveguide, the electrical line being arranged a distance from the waveguide electrodes, and connecting arrangements, each being assigned to one of the waveguide electrodes.

Abstract: An electrical line arrangement, comprising a first and a second electrical line forming a coplanar strip line and at least one terminating resistor terminating the first and the second electrical line, is provided. In a first region of the electrical line arrangement the first and the second electrical line extend in a first distance from one another and in a second region of the electrical line arrangement the first and the second electrical line extend in a second distance from one another that is larger than the first distance. The terminating resistor is physically arranged at a position between the first and the second electrical line in the second region of the electrical line arrangement. At least one electrically conductive structure is arranged between the first and the second electrical line at least partially in the second region of the electrical line arrangement.

Abstract: It is provided a vectorial network analyzer, comprising an input and output measuring device; a beat source for generating an optical beat signal; an optical transmission device which divides the optical beat signal into at least one first and one second partial signal, wherein the transmission device conducts the first partial signal to at least one terahertz transmitter and the second partial signal to at least one terahertz receiver and/or to at least one terahertz reference receiver; and a phase changing unit for varying the phase of the first and/or the second partial signal of the optical beat signal.

Abstract: It is provided a vectorial network analyzer, comprising an input and output measuring device; a beat source for generating an optical beat signal; an optical transmission device which divides the optical beat signal into at least one first and one second partial signal, wherein the transmission device conducts the first partial signal to at least one terahertz transmitter and the second partial signal to at least one terahertz receiver and/or to at least one terahertz reference receiver; and a phase changing unit for varying the phase of the first and/or the second partial signal of the optical beat signal.

Abstract: An electro-optical modulator device is provided. The electro-optical modulator device comprises at least one electro-optical modulator having a first and a second optical waveguide and an electrode arrangement for applying a voltage across the optical waveguide, wherein the electrode arrangement comprises a plurality of first waveguide electrodes and a plurality of second waveguide electrodes arranged on top of the first and the second optical waveguide, respectively, wherein the first and second waveguide electrodes are capacitively coupled to one another; and at least one driver unit for supplying a voltage to the electrode arrangement; and an electrical connection between the driver unit and the electrode arrangement. The electrical connection between the driver unit and the electrode arrangement comprises a flexible coplanar strip line.

Abstract: An electro-optical modulator is provided. The electro-optical modulator comprises at least one optical waveguide, an electrode arrangement for applying a voltage across the optical waveguide. The electrode arrangement comprises a first and a second electrical line and at least two terminating resistors terminating the first and the second electrical line. The electrode arrangement comprises at least one capacitive structure that capacitively couples, but galvanically separates the two terminating resistors. The capacitive structure comprises at least two electrically conductive layers physically arranged at a position between the first and the second electrical line, wherein the at least two layers are separated by at least one dielectric layer.

Abstract: A monolithic optoelectronic device has a spot-size converter optically connected to a waveguide. The overclad extending over the core of the waveguide is thinner and differently doped than the overclad of the spot-size converter. This structure can be made by applying a process of etching and enhanced selective area regrowth to create regions of the overclad of different thickness or doping. The spot-size converter core is made of a different material than the waveguide core by using etching and enhanced selective area regrowth.

Abstract: An electro-optical modulator device is provided. The electro-optical modulator device comprises at least one electro-optical modulator having a first and a second optical waveguide and an electrode arrangement for applying a voltage across the optical waveguide, wherein the electrode arrangement comprises a plurality of first waveguide electrodes and a plurality of second waveguide electrodes arranged on top of the first and the second optical waveguide, respectively, wherein the first and second waveguide electrodes are capacitively coupled to one another; and at least one driver unit for supplying a voltage to the electrode arrangement; and an electrical connection between the driver unit and the electrode arrangement. The electrical connection between the driver unit and the electrode arrangement comprises a flexible coplanar strip line.

Abstract: An electrical line arrangement, comprising a first and a second electrical line forming a coplanar strip line and at least one terminating resistor terminating the first and the second electrical line, is provided. In a first region of the electrical line arrangement the first and the second electrical line extend in a first distance from one another and in a second region of the electrical line arrangement the first and the second electrical line extend in a second distance from one another that is larger than the first distance. The terminating resistor is physically arranged at a position between the first and the second electrical line in the second region of the electrical line arrangement. At least one electrically conductive structure is arranged between the first and the second electrical line at least partially in the second region of the electrical line arrangement.

Abstract: An electro-optical modulator is provided. The electro-optical modulator comprises at least one optical waveguide, an electrode arrangement for applying a voltage across the optical waveguide. The electrode arrangement comprises a first and a second electrical line and at least two terminating resistors terminating the first and the second electrical line. The electrode arrangement comprises at least one capacitive structure that capacitively couples, but galvanically separates the two terminating resistors. The capacitive structure comprises at least two electrically conductive layers physically arranged at a position between the first and the second electrical line, wherein the at least two layers are separated by at least one dielectric layer.

Abstract: A monolithic optoelectronic device has a spot-size converter optically connected to a waveguide. The overclad extending over the core of the waveguide is thinner and differently doped than the overclad of the spot-size converter. This structure can be made by applying a process of etching and enhanced selective area regrowth to create regions of the overclad of different thickness or doping. The spot-size converter core is made of a different material than the waveguide core by using etching and enhanced selective area regrowth.

Abstract: A Mach-Zehnder modulator arrangement includes at least one electro-optic Mach-Zehnder modulator having a first optical waveguide forming a first modulator arm and a second optical waveguide forming a second modulator arm. A travelling wave electrode arrangement includes first waveguide electrodes for applying a voltage across the first optical waveguide and second waveguide electrodes for applying a voltage across the second optical waveguide. The first waveguide electrodes are capacitively coupled to the second waveguide electrodes. A driver unit supplies an alternating voltage to the travelling wave electrode arrangement. The driver unit includes a first output port coupled to the first waveguide electrodes and a second output port coupled to the second waveguide electrodes. The driver unit supplies a first varying signal to the first waveguide electrodes via the first output port and a second varying signal to the second waveguide electrodes via the second output port.

Abstract: A monolithic optoelectronic device has a spot-size converter optically connected to a waveguide. The overclad extending over the core of the waveguide is thinner and more highly doped that the overclad of the spot-size converter. This structure can be made by applying a process of selective etching and enhanced regrowth to create selective regions of the overclad of different thickness or doping.

Abstract: An electro-optic Mach-Zehnder modulator arrangement includes first and second optical waveguides forming, respectively, first and second arms of the Mach-Zehnder modulator. An electrode arrangement includes a first waveguide electrode output port coupled to the first waveguide electrodes a second waveguide electrode arranged on top of a capacitive segment of the first and the second optical waveguides, respectively, such that a voltage can be applied across the capacitive segments of the first and second optical waveguide. At least one driver unit supplies a voltage to the electrode arrangement. The driver unit includes first and second output ports coupled, respectively, to the first and second waveguide electrodes. The driver unit supplies first and second varying signals to the first and second waveguide electrodes via the first and second output ports, respectively. A non-grounded conductive region connects the capacitive segments of the first and second optical waveguides to each other.

Abstract: A Mach-Zehnder modulator arrangement includes at least one electro-optic Mach-Zehnder modulator having a first optical waveguide forming a first modulator arm and a second optical waveguide forming a second modulator arm. A travelling wave electrode arrangement includes first waveguide electrodes for applying a voltage across the first optical waveguide and second waveguide electrodes for applying a voltage across the second optical waveguide. The first waveguide electrodes are capacitively coupled to the second waveguide electrodes. A driver unit supplies an alternating voltage to the travelling wave electrode arrangement. The driver unit includes a first output port coupled to the first waveguide electrodes and a second output port coupled to the second waveguide electrodes. The driver unit supplies a first varying signal to the first waveguide electrodes via the first output port and a second varying signal to the second waveguide electrodes via the second output port.

Abstract: An electro-optic Mach-Zehnder modulator arrangement includes first and second optical waveguides forming, respectively, first and second arms of the Mach-Zehnder modulator. An electrode arrangement includes a first waveguide electrode output port coupled to the first waveguide electrodes a second waveguide electrode arranged on top of a capacitive segment of the first and the second optical waveguides, respectively, such that a voltage can be applied across the capacitive segments of the first and second optical waveguide. At least one driver unit supplies a voltage to the electrode arrangement. The driver unit includes first and second output ports coupled, respectively, to the first and second waveguide electrodes. The driver unit supplies first and second varying signals to the first and second waveguide electrodes via the first and second output ports, respectively. A non-grounded conductive region connects the capacitive segments of the first and second optical waveguides to each other.

Abstract: An electro-optic Mach-Zehnder modulator includes a first optical waveguide forming a first arm of the Mach-Zehnder modulator, and a second optical waveguide forming a second arm thereof. The first or second optical waveguide includes capacitive segments that are spaced apart from one another, each forming an electrical capacitor. A travelling wave electrode arrangement applies a voltage across the first or second optical waveguide. The travelling wave electrode arrangement includes waveguide electrodes arranged on the capacitive segments , an electrical line extending along a part of the first or second optical waveguide, the electrical line being arranged a distance from the waveguide electrodes, and connecting arrangements, each being assigned to one of the waveguide electrodes.

Abstract: A monolithic optoelectronic device has a spot-size converter optically connected to a waveguide. The overclad extending over the core of the waveguide is thinner and more highly doped that the overclad of the spot-size converter. This structure can be made by applying a process of selective etching and enhanced regrowth to create selective regions of the overclad of different thickness or doping.

Abstract: A multi-source reactive deposition process for preparing a phosphor layer for an AC TFEL device having the chemical formula M.sup.II M.sup.III.sub.2 X.sub.4 :RE, where M.sup.II is a group II metal taken from the group magnesium, calcium, strontium and barium, M.sup.III is a group III metal taken from the group aluminum, gallium and indium, X is taken from the group sulfur and selenium, and RE comprises a rare earth activator dopant taken from the group cerium and europium is disclosed. The phosphor film is formed in crystalline form on a substrate heated to a temperature between 400.degree. and 800.degree. C. by depositing more than one deposition source chemical where at least one of the deposition source chemicals of the group II metal or the group III metal is a compound.