Lumentum Technology UK Limited

Lumentum Operations LLC

Oclaro Technology Limited

Flavio Dell'Orto

Marco Villa

Stefano Balsamo

Mario Bonazzoli

Paolo Vergani

Giuseppe Cusmai

A testing system for a modulator includes a radio frequency (RF) generator, an optical power meter, and an electrical power meter. The RF generator is configured to generate and provide a first plurality of RF signals and a second plurality of RF signals, wherein the first plurality of RF signals and the second plurality of RF signals are associated with a plurality of frequencies. The optical power meter is configured to measure an optical power of an output optical signal, which is modulated by the modulator based on the first plurality of RF signals, to facilitate determination of a transmission response measurement of the modulator for each frequency of the plurality of frequencies. The electrical power meter is configured to measure a portion of each RF signal of the second plurality of RF signals to facilitate determination of a reflectance response measurement of the modulator for each frequency.

Testing system for high-frequency modulators

There is described an RF waveguide array. The array comprises a substrate comprising a plurality of optical waveguides, each waveguide being elongate in a first direction. An electrical RF transmission line array is located on a face of the substrate and comprises a plurality of signal electrodes and a plurality of ground electrodes, each electrode extending in the first direction. Each signal electrode is positioned to provide a signal to two respective waveguides. The ground electrodes include at least one intermediate ground electrode positioned between each pair of signal electrodes. Each intermediate ground electrode includes a portion extending into the substrate.

Waveguide array

A chip comprising a bonding pad region and a transmission section. The bonding pad region has a first impedance, and is configured for electrical connection to an external transmission line. The transmission section extends away from the bonding pad region and has a second impedance. The bonding pad region is configured to enable field confinement and field matching between the bonding pad region and the external transmission line, and the second impedance is not equal to the first impedance.

Optimised RF input section for coplanar transmission line

A radio frequency, RF, waveguide array. The array comprises a substrate and an electrical RF transmission line array. The substrate comprises a plurality of optical waveguides, each waveguide being elongate in a first direction. The electrical RF transmission line array is located on a face of the substrate and comprises a plurality of RF transmission lines. Each transmission line comprises a signal electrode and at least two ground electrodes located on either side of the signal electrode. Each electrode extends in the first direction. Each signal electrode is positioned to provide a signal to two respective waveguides, i.e. each RF transmission line is positioned adjacent to two respective waveguides. The ground electrodes include at least two intermediate ground electrodes positioned between each pair of signal electrodes. Intermediate ground electrodes of different RF transmission lines are separated from each other by channels.

Ground structure in RF waveguide array

A radio frequency, RF, waveguide array. The array comprises a substrate and an electrical RF transmission line array. The substrate comprises a plurality of waveguides, each waveguide being elongate in a first direction. The electrical RF transmission line array is located on a face of the substrate and comprises a plurality of signal electrodes and at least two ground electrodes. Portions of the ground electrodes which are relatively distal from the signal electrodes have reduced height in the direction transverse to the substrate to reduce the amount of material required to produce them.

A photonic assembly is described. The assembly comprises a substrate. An optical modulator () in or on the substrate has an output port coupled to an output waveguide () mounted in or on the substrate. A spiller waveguide () is mounted in or on the substrate. The spiller waveguide () has an input end () physically separated from but proximate to the output waveguide () so as to collect light spilt from the output port or output waveguide (). The modulator () may be a MZI modulator.

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Desio, Italy

Flavio Dell'Orto