An integrated photonic device independently directs each channel of a multiplexed input optical signal received from a corresponding one of N input port to one of N output ports, each multiplexed input optical signal including N channels. The device includes: N input waveguides; secondary waveguides; wavelength-selective filters, each: i) including a ring resonator, ii) being optically coupled to a corresponding one of the N input waveguides and a corresponding one of the secondary waveguides, and iii) being switchable between a first state in which an optical signal in a corresponding one of the N channels is coupled from the corresponding input waveguide into the corresponding secondary waveguide and a second state in which the optical signal in the corresponding one of the N channels is not coupled into the corresponding secondary waveguide; N multi-wavelength mixers; and N output waveguides.

The invention relates to a photonic system provided with a photonic chip made in silicon technology, said photonic chip (10) comprising:a Mach-Zehnder modulator (100) the modulation sections (105, 106) of which extend over a length L smaller than 3 mm;first means (107) for adjusting operating point;a semiconductor optical amplifier (SOA) configured to amplify a signal modulated by the Mach-Zehnder modulator, the semiconductor optical amplifier (SOA) being such that the amplitude of optical modulation associated with the photonic chip, when the set phase shift F is adjusted to the range 0.6*pi-0.9*pi, is of between 2 dBm and 6 dBm, at an output port S placed downstream of the semiconductor optical amplifier (SOA).

An optical semiconductor device includes an optical modulator provided on a substrate, an optical waveguide provided on the substrate, one end of the optical waveguide being connected to a light emission side of the optical modulator and another end of the optical waveguide being present at an end portion of the substrate, a phase adjusting unit provided on a path of the optical waveguide and an optical amplification unit provided on the path of the optical waveguide, wherein a minimum value or a maximum value of a transmittance spectrum having a ripple that periodically fluctuates with respect to a frequency because of multiple reflection of light that occurs between the one end and the other end of the optical waveguide is matched with a wavelength of the light input to the optical modulator by phase adjustment of the phase adjusting unit, and an error vector amplitude is minimized.

Optical chiplets can be mounted to zero-change VLSI chips to form an integrated electro-optical device. Control signals for controlling active optical devices on the optical chiplets can be provided from the VLSI chip and coupled to the active optical devices on the optical chiplets. The technology provides small-area, low-energy, RF optical interfaces for VLSI chips.

An optical transmitter includes a semiconductor optical amplifier (SOA) configured to receive light and amplify the light to generate amplified light. A backup SOA is also configured to receive light and amplify the light to generate backup amplified light. An SOA input switch selectively routes light toward either the SOA or the backup SOA. An output outputs the amplified light generated by the SOA or the backup SOA. Examples can include multiple lanes, each lane having an SOA, and each backup SOA being usable by one lane or two adjacent lanes.

A semiconductor optical integrated element according to the present disclosure includes: a first optical amplifier which amplifies a signal beam inputted from a first end surface; a first passive optical waveguide which guides the amplified signal beam toward a direction different from a direction of the optical waveguide; an optical splitter which splits the guided signal beam into a plurality of signal beams; a phase modulator which is connected to the first passive optical waveguide and performs phase modulation on the plurality of signal beams; a second passive optical waveguide which guides each phase-modulated signal beam toward the direction of the optical waveguide; an optical multiplexer which multiplexes the plurality of phase-modulated signal beams into one signal beam; and a second optical amplifier which amplifies the signal beam guided by the second passive optical waveguide, and whose saturated beam output is smaller than that of the first optical amplifier.

A modulator including multiple modulation units each including multiple ring modulators and an output waveguide configured to multiplex beams that have passed through the ring modulators included in the modulation units and output a multiplexed beam. The modulation units each include a sorting waveguide that guides a beam inputted from outside to the ring modulators. All the ring modulators included in the modulation units have resonance frequencies adjusted to differ from each other. A modulator, modulation system, and transmission module for increasing the data communication capacity without having to increase the number of light sources can be provided.