Finisar Sweden Ab

Finisar Corporation

Christopher Daunt

David Adams

Robert Lewén

Martin Zirngibl

Andrei Kaikkonen

Jan-Olof Wesstrom

Marek Grzegorz Chacinski

Jan-Olof Wesström

Urban Eriksson

Martin Anders Isak Stattin

Peter Szabo

Efthymios Rouvalis

A method of manufacturing an integrated semiconductor optical waveguiding device comprising an elongated waveguide, the method comprising:

Method of manufacturing an integrated semiconductor optical waveguiding device

An optical interference modulator comprises a main input, a main output, an optical splitter connected to the main input, first and second MMI couplers, each with a first primary-end access port connected to the splitter; a second primary-end access port connected to the main output; a first secondary-end access port connected to a respective primary waveguide; and a second secondary-end access port connected to a respective secondary waveguide. A light reflector is arranged to reflect light incident from said primary and secondary waveguides back into the same respective waveguide such that light travelling through the respective waveguide from the respective secondary-end access port, after reflection, travels back to the same secondary-end access port. For the MMI couplers, at least one of the respective primary and secondary waveguides comprises a respective light phase modulating device arranged to modulate the phase of light travelling along the corresponding waveguide in either direction.

Optical device

An electro-optical modulator includes a substrate comprising a first Mach-Zehnder modulator comprising a first waveguide and a second waveguide and a second Mach-Zehnder modulator comprising a first waveguide and a second waveguide. A first positive signal electrode is positioned on the substrate over the first waveguide of the first Mach-Zehnder modulator and a first negative signal electrode is positioned on the substrate over the second waveguide of the first Mach-Zehnder modulator. The first positive signal electrode and the first negative signal electrode are connected to a first differential signal input. A second positive signal electrode is positioned on the substrate over the first waveguide of the second Mach-Zehnder modulator and a second negative signal electrode positioned on the substrate over the second waveguide of the second Mach-Zehnder modulator. The second positive signal electrode and the second negative signal electrode are connected to a second differential signal input. A first ground electrode is positioned on the substrate between the first and second Mach-Zehnder modulators connected to ground potential. A second ground electrode is connected to ground potential and positioned on the substrate adjacent to the first Mach-Zehnder modulator such that the first positive signal electrode and the first negative signal electrode are between the second ground electrode and the first ground electrode. A third ground electrode is connected to ground potential and positioned on the substrate adjacent to the second Mach-Zehnder modulator such that the second positive signal electrode and the second negative signal electrode are between the third ground electrode and the first ground electrode. A plurality of first electrical connectors connect the first ground electrode to the second ground electrode and a plurality of second electrical connectors connect the first ground electrode to the third ground electrode. A spacing between at least two of the plurality of first electrical connectors is chosen to achieve a desired cross talk between an optical signal generated by the first Mach-Zehnder modulator and an optical signal generated by the second Mach-Zehnder modulator.

Reduced-cross-talk coherent optical transmitter

Method for modulating a carrier light wave to achieve, a modulated light wave which carries information by symbols selected from a set of at least two different symbols. The light led through each path is phase-shifted by a respective total variable part phase shift, which for each path is the sum of at least three respective variable part phase shifts. Each variable part phase shift for each modulation state assumes one of two respective predetermined values, and each symbol is modulated using a respective combination of two such total variable part phase shifts. The modulation performed by the two paths is a PSK (Phase Shift Keying) modulation scheme, the group of symbols includes 2unique symbols, the light led through each respective path is phase shifted using 2&#x2212;1 variable part phase shifts, and the respective difference between the respective predetermined values is the same for all variable part phase shifts.

Method for modulating a carrier light wave

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Solna, Sweden

Christopher Daunt