A device and method of optical equalization using an optical modulator is provided. An electrical modulation signal is split into a first modulation signal and a second modulation signal. The second modulation signal is delayed relative to the first modulation signal. An amplitude of the second modulation signal is attenuated relative to the first modulation signal. The first modulation signal is applied to a first waveguide segment of the optical modulator. The second modulation signal that is delayed and attenuated relative to the first modulation signal is applied to a second waveguide segment of the optical modulator. Both the applied first and second modulation signals generate a feed-forward equalized optical signal that is recombined in the optical domain.

A method and system of optical communication are provided. An optical modulator device includes a first and a second waveguide segment, and is configured to modulate an incident optical signal. A first feed-forward equalization (FFE) circuit including an inner first tap and an inner second tap, is configured to equalize the first waveguide segment. A second FFE circuit including a first inner tap and a second inner tap, is configured to equalize the second waveguide segment. An FFE recombination of the first inner tap and the second inner tap of the first and second FFE circuits, is in the electrical domain, respectively. An FFE recombination of the first and second modulation signals, operative to equalize a combination of the first second waveguide segments, is in the optical domain.

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.

In an embodiment, a phase shifter includes: a light input end; a light output end; a p-type semiconductor material, and an n-type semiconductor material contacting the p-type semiconductor material along a boundary area, wherein the boundary area is greater than a length from the light input end to the light output end multiplied by a core width of the phase shifter.

A technique for tuning a silicon photonics (SiP) based nested (parent/child) Mach-Zehnder modulator (MZM). The technique includes a sequence of applying dither tones on individual arms of the child MZMs, observing changes in the output of the MZM, and adjusting the MZM until reaching the null points for the child MZMs and the quad point for the parent MZM.

The present invention relates to telecommunication techniques and integrated circuit (IC) devices. More specifically, embodiments of the present invention provide an off-quadrature modulation system. Once an off-quadrature modulation position is determined, a ratio between DC power transfer amplitude and dither tone amplitude for a modulator is as a control loop target to stabilize off-quadrature modulation. DC power transfer amplitude is obtained by measuring and sampling the output of an optical modulator. Dither tone amplitude is obtained by measuring and sampling the modulator output and performing calculation using the optical modulator output values and corresponding dither tone values. There are other embodiments as well.

A Mach-Zehnder modulator includes: a support having a principal surface, the principal surface having a first area, a second area, and a third area; a first structure including first and second semiconductor mesas disposed on the first and second areas, respectively; a second structure including a first strip-shaped semiconductor region on the second area, a second strip-shaped semiconductor region on the third area, and a first strip-shaped void and a second strip-shaped void defining the first and second strip-shaped semiconductor regions; a first electrode disposed on the first semiconductor mesa in the first area, the first strip-shaped semiconductor region of the second structure being disposed between the support and the second semiconductor mesa of the first structure in the second area, and the first and second semiconductor mesas, and the first and second strip-shaped semiconductor regions being arranged to constitute a first arm waveguide of the Mach-Zehnder modulator.

An optical modulator includes a substrate having an electro-optic effect, an optical waveguide formed on the substrate, a modulation part which modulates light waves propagating through the optical waveguide, and a light receiving element which detects the light waves propagating through the optical waveguide. As the modulation part, a first modulation part and a second modulation part, which respectively modulate light waves into which input light branches, are provided. As the light receiving element, a light receiving element for the first modulation part and a light receiving element for the second modulation part are provided. The light receiving elements are disposed such that their positions in a light propagation direction are shifted from each other by an amount corresponding to one light receiving element, or more.

Magneto-optical modulator-based systems and devices for transferring quantum information are described. Such systems can be used for many applications, including as part of quantum computers. An example system includes a quantum information system configured to provide a signal corresponding to at least one qubit. The system further includes a magneto-optical driver configured to receive the signal corresponding to the at least one qubit and process the signal to generate a current based on the signal corresponding to the at least one qubit. The system further includes a magneto-optical modulator configured to receive the current from the magneto-optical driver and provide a modulated light output by modulating a received light input based on the current.

An optical switch structure includes a substrate, a first electrical contact, and a first material having a first conductivity type electrically connected to the first electrical contact. The optical switch structure also includes a second material having a second conductivity type coupled to the first material, a second electrical contact electrically connected to the second material, and a waveguide structure disposed between the first electrical contact and the second electrical contact. The waveguide structure includes a waveguide core coupled to the substrate and including a core material characterized by a first index of refraction and a waveguide cladding at least partially surrounding the waveguide core and including a cladding material characterized by a second index of refraction less than the first index of refraction and an isotope-enhanced Pockels effect.