A process for detecting a detuning which currently exists at a wavelength splitter within an optical fiber transmission network, comprises assessing expected values relating to at least two light sub-carriers, and determining actual values relating to said at least two light sub-carriers. A wavelength shift value which quantifies the existing detuning is obtained from a comparison between the expected and actual values. The process may be completed with updating a tuning of a light source from which the sub-carriers are derived, so as to reduce the wavelength shift.

The invention concerns an optoelectronic chip including a pair of optical inputs having a same bandwidth, and each being adapted to a different polarization, at least one photonic circuit to be tested, and an optical coupling device configured to couple the two inputs to the circuit to be tested.

An optoelectronic chip includes optical inputs having different passbands, a photonic circuit to be tested, and an optical coupling device configured to couple said inputs to the photonic circuit to be tested.

A process for detecting a detuning which currently exists at a wavelength splitter within an optical fibre transmission network, comprises assessing expected values relating to at least two light sub-carriers, and determining actual values relating to said at least two light sub-carriers. A wavelength shift value which quantifies the existing detuning is obtained from a comparison between the expected and actual values. The process may be completed with updating a tuning of a light source from which the sub-carriers are derived, so as to reduce the wavelength shift.

The wavelength response of an arrayed waveguide grating can be tuned, in accordance with various embodiments, using a beam sweeper including one or more heaters to shift a lateral position of light focused by the beam sweeper at an interface of the beam sweeper with an input free propagation region of the arrayed waveguide grating.

In the examples provided herein, a system has a plurality of arrayed waveguide gratings (AWG) having a plurality of input ports and a plurality of output ports. A signal within a given wavelength channel transmitted to one of the input ports of a given AWG is routed to one of the output ports of the given AWG based on a signal wavelength. The system also has a plurality of nodes, with each node comprising a set of components for each AWG that the node is coupled to. Each set of components comprises a plurality of optical transmitters, where each optical transmitter is tunable over multiple wavelength channels within a different wavelength band; a band multiplexer to multiplex the multiple wavelength channels within each different wavelength band; and a first output fiber to couple an output of the band multiplexer to one of the input ports of a first AWG.

A cognitive training method has a step of obtaining sensor data of a subject during a memory exercise which in turn determines whether the sensor data includes predetermined information indicative of cognitive functions used for remembering. The step of advancing the memory exercise is carried out when it is determined that the sensor data includes predetermined information indicative of cognitive functions used for remembering. The step of calculating an objective cognitive assessment of the subject is carried out when the memory exercise is completed and cognitive training is measured at least partially in response to the advancing of the memory exercise. The fact that an objective cognitive assessment is calculated provides a method of using an autodidactic cognitive training device.

A portion of an optical waveguide extending laterally within a photonic integrated circuit (PIC) chip is at least partially freed from the substrate to allow physical displacement of a released waveguide end relative to the substrate and relative to an adjacent photonic device also fabricated in the substrate. The released waveguide end may be displaced to modulate interaction between the photonic device and an optical mode propagated by the waveguide. In embodiments where the photonic device is an optical coupler, employing for example an Echelle grating or arrayed waveguide grating (AWG), mode propagation through the coupler may be modulated via physical displacement of the released waveguide end. In one such embodiment, thermal sensitivity of an integrated optical wavelength division multiplexer (WDM) is reduced by displacing the released waveguide end relative to the coupler in a manner that counters a temperature dependence of the optical coupler.

An optical device includes a first waveguide extending in a first direction and a second waveguide connected to the first waveguide. The second waveguide includes a first mirror, a second mirror, and an optical waveguide layer. At least either the first waveguide or the second waveguide has one or more gratings in a part of a connection region in which the first mirror, the second mirror, and the first waveguide overlap one another when seen from an angle parallel with a direction perpendicular to a first reflecting surface of the first mirror. The one or more gratings is at a distance that is longer than at least either a thickness of the first mirror or a thickness of the second mirror in the first direction from an end of the first mirror or the second mirror that is in the connection region.

Embodiments include a wavelength selective communication system for use in vehicles. In an embodiment, the communication system may include a primary dielectric waveguide having a first cross-sectional area. In an embodiment, a coupling arm dielectric waveguide may be communicatively coupled to the primary dielectric waveguide. In an embodiment, the coupling arm has a second cross-sectional area that is smaller than or equal to the cross-sectional area of the first cross-sectional area. According to an embodiment, the coupling arm is communicatively coupled to the primary dielectric waveguide by a waveguide connector.