Abstract: A photonic integrated circuit (PIC) in which some optical waveguides have laterally tilted waveguide cores used to implement passive polarization-handling circuit elements, e.g., suitable for processing polarization-division-multiplexed optical communication signals. Different sections of such waveguide cores may have continuously varying or fixed lateral tilt angles. Different polarization-handling circuit elements can be realized, e.g., using different combinations of end-connected untilted and laterally tilted waveguide-core sections. In some embodiments, laterally tilted waveguide cores may incorporate multiple-quantum-well structures and be used to implement active circuit elements. At least some embodiments beneficially lend themselves to highly reproducible fabrication processes, which can advantageously be used to achieve a relatively high yield of the corresponding PICs during manufacture.

Abstract: An optical device includes a semiconductor substrate having a major surface, and an optical waveguide structure on the major surface. The optical waveguide structure comprises a lower optical core, an upper optical core, and an intermediate optical cladding, where the upper optical core is vertically above the lower optical core and the intermediate optical cladding separates and is in contact with the optical cores. The optical cores are optically coupled in first and second sections of the optical waveguide structure near the respective first and second ends, and the optical waveguide structure has a parallel pair of optical waveguides extending from the first section to the second section with each of the optical waveguides including one of the optical cores.

Abstract: The present disclosure relates to a modulator arrangement, including at least a first and a second electro-optical Mach-Zehnder modulator. At least one optical waveguide of the first Mach-Zehnder modulator crosses at least one optical waveguide of the second Mach-Zehnder modulator. A method for fabricating a modulator arrangement is also disclosed herein.

Abstract: A photonic integrated circuit (PIC) in which some optical waveguides have laterally tilted waveguide cores used to implement passive polarization-handling circuit elements, e.g., suitable for processing polarization-division-multiplexed optical communication signals. Different sections of such waveguide cores may have continuously varying or fixed lateral tilt angles. Different polarization-handling circuit elements can be realized, e.g., using different combinations of end-connected untilted and laterally tilted waveguide-core sections. In some embodiments, laterally tilted waveguide cores may incorporate multiple-quantum-well structures and be used to implement active circuit elements. At least some embodiments beneficially lend themselves to highly reproducible fabrication processes, which can advantageously be used to achieve a relatively high yield of the corresponding PICs during manufacture.

Abstract: The present disclosure relates to a modulator arrangement, including at least a first and a second electro-optical Mach-Zehnder modulator. At least one optical waveguide of the first Mach-Zehnder modulator crosses at least one optical waveguide of the second Mach-Zehnder modulator. A method for fabricating a modulator arrangement is also disclosed herein.

Abstract: An electro-optical modulator is provided. The electro-optical modulator comprises at least one optical waveguide; a plurality of segments, wherein each one of the segments comprises at least one waveguide electrode for supplying a voltage to the optical waveguide, wherein the segments are arranged one behind the other along the optical waveguide, and wherein each one of the segments comprises its own driver unit electrically connected to the waveguide electrode of the segment for supplying an electric signal. Each one of the segments forms an electrical resonant circuit, wherein the segments are configured in such a way that the resonance frequency of the electrical resonant circuit of at least one of the segments lies within the frequency range of an electrical signal supplied to the driver units.

Abstract: An electro-optical modulator is provided. The electro-optical modulator comprises at least one optical waveguide; a plurality of segments, wherein each one of the segments comprises at least one waveguide electrode for supplying a voltage to the optical waveguide, wherein the segments are arranged one behind the other along the optical waveguide, and wherein each one of the segments comprises its own driver unit electrically connected to the waveguide electrode of the segment for supplying an electric signal. Each one of the segments forms an electrical resonant circuit, wherein the segments are configured in such a way that the resonance frequency of the electrical resonant circuit of at least one of the segments lies within the frequency range of an electrical signal supplied to the driver units.