An optical modulator includes a substrate having an electro-optic effect; a waveguide pattern provided on the substrate and configured to modulate light; and a dummy pattern having a predetermined potential along the waveguide pattern from an input side to an output side.

An optical signal sending apparatus includes an optical modulator, a differential driver, and a phase modulator. The optical modulator includes an optical input end, a first modulation region, a connection region, a second modulation region, and an optical output end. The first modulation region includes a first modulation arm and a second modulation arm. The second modulation region includes a third modulation arm and a fourth modulation arm. Each modulation arm includes an optical waveguide and electrodes on two sides of the optical waveguide. A differential drive signal is used to drive the two modulation regions, so that photoelectric signal modulation is implemented. The modulation arms are arranged in a stacked manner, so that a size of the optical modulator can be greatly reduced, thereby facilitating miniaturization.

Embodiments of the present application provide an optical signal generation device. The device includes a laser, a first modulator, a second modulator, a first adjustment module, and a beam combiner. The laser is configured to: output a first optical signal to the first modulator, and output a second optical signal to the second modulator. The two modulators are separately configured to: receive an optical signal and a loaded electrical modulation signal, and modulate the optical signal based on the electrical modulation signal, to obtain a first modulated optical signal and a second modulated optical signal. The first adjustment module is further configured to adjust a phase of the modulated optical signal or an optical path to the beam combiner. The beam combiner is configured to: combine the first modulated optical signal obtained after the adjustment and the second modulated optical signal, and output a combined signal.

In an optical network system: control light is generated by optical modulation based on a modulated data signal which is generated by modulation of a carrier signal with a data signal; and the control light is optically combined with an optical carrier which is to propagate through a nonlinear optical medium, so as to cause cross phase modulation of the optical carrier with the control light in the nonlinear optical medium.

A system for transmission of an optical signal, the system including an optical coupler for splitting said signal into a first copy and a second copy. The optical coupler has an input for receiving the optical signal, a first output for the first copy and a second output for the second copy. The system also includes a first optical guide connected to the first output, a second optical guide connected to the second output and a superposition module for coherently superimposing the first copy and the second copy of the signal.

Provided is an optical transmission module which can generate PAM4 optical modulation signals without converting a plurality of binary electric signals to a multi-level electric signal. An optical transmission module (200) comprising: a light source (60) for emitting continuous waveform (CW) light; optical modulators (51,52,53) arranged in series with a path of the CW light configured to modulate the CW light by switching relatively large absorption and relatively small absorption of the optical modulators in response to a modulation signal applied to the respective optical modulators; and an arithmetic logic circuit (100) configured to receive a plurality of binary electrical signals, and then to perform logic operation on the plurality of binary electrical signals for generating a new plurality of binary electrical signals, wherein each of the new plurality of binary electrical signals is applied to the respective optical modulators as the modulation signal.

Device for modulating the intensity of an optical signal on four levels, this device comprising: a first resonant ring modulator comprising an output port capable of delivering a first modulated optical signal, a second resonant ring modulator comprising an output port capable of delivering a second modulated optical signal, an optical assembler comprising: a first input optically coupled to the output port of the second resonant ring modulator, a second input optically coupled to the output port of the first resonant ring modulator, and an output capable of delivering the optical signal of which the intensity is modulated on four different levels constructed by combining the optical signals received on its first and second inputs.

Integrated optical filter and photodetectors and methods of fabrication thereof are described herein according to the present disclosure. An example of an integrated optical filter and photodetector described herein includes a substrate, an insulator layer on the substrate, and a semiconductor layer on the insulator layer. An optical filter having a resonant cavity is formed in or on the semiconductor layer. The integrated optical filter and photodetector further includes two first metal fingers and a second metal finger interdigitated between the two first metal fingers on the semiconductor layer forming Schottky barriers. The first metal fingers are constructed from a different metal relative to the second metal finger.

One example includes an optical transmitter system. The system includes a waveguide to receive and propagate an optical signal. The system also includes a ring modulation system comprising a ring resonator that is optically coupled to the waveguide and is to resonate a given wavelength of the optical signal in response to an input data signal that is provided to a modulation amplifier to provide carrier injection to change a refractive index of the ring resonator to resonate the given wavelength of the optical signal to modulate the optical signal. The system further includes a tuning controller associated with the ring modulation system. The tuning controller can implement iterative feedback tuning of the ring modulation system based on a relative amplitude of an optical intensity of the given wavelength in the ring resonator and a variable reference amplitude to substantially stabilize the ring resonator with respect to the given wavelength.

A system includes a transmitter configured to output an optical signal. The transmitter includes a seed laser, an optical array including a plurality of array elements, and a plurality of phase shifters in a multi-layer arrangement. The multi-layer arrangement includes a plurality of layers between the seed laser and the optical array, wherein a first layer of the plurality of layers transmits light to a second layer of the plurality of layers. The first layer has fewer phase shifters than the second layer. The multi-layer arrangement also includes a plurality of branches wherein each branch includes a phase shifter from each of the plurality of layers connected in series between the seed laser and one of the plurality of array elements. Each phase shifter is configured to shift the optical signal incrementally to amass a total phase shift for each of the plurality of array elements.