Apparatus and devices to monitor optical power within optical fibers in a substantially non-invasive fashion are disclosed. Optical monitors are comprised of low leakage junctions within very compact optical junctions which each confine the leakage within a very small local volume but also include photodiode means to ascertain signal amplitude. Multiplexing circuits for different groupings of lines enables automated monitoring of optical status across a communication network.

A mid-infrared light emitting diode is provided, including a graphene lower electrode layer, a black phosphorous layer, and a graphene upper electrode layer sequentially arranged along a thickness direction of the mid-infrared light emitting diode, in which the black phosphorous layer contacts the graphene lower electrode layer and the graphene upper electrode layer. A manufacturing method of the mid-infrared light emitting diode, a silicon photonic circuit and a manufacturing method thereof are also provided.

A laser apparatus includes: one or more laser diodes and two or more optical combiners. Further, output sides of the one or more laser diodes are connected to an input side of one optical combiner among the two or more optical combiners, and an output side of the one optical combiner is connected to an input side of an optical combiner other than the one optical combiner.

Antenna assemblies for vehicles, such as RADAR sensor antenna assemblies, and related waveguide assemblies. In some embodiments, the assembly may comprise a waveguide groove having a waveguide ridge positioned therein. The waveguide groove may extend along an axis with the waveguide ridge intermittently extending on opposite sides of the axis in a periodic or at least quasiperiodic manner along at least a portion of the waveguide ridge. An antenna structure, such as a plurality of slots, may be operably coupled with the waveguide ridge and may be positioned and configured to deliver electromagnetic radiation from the waveguide groove therethrough.

A packaged transmitter device includes a base member comprising a planar part mounted with a thermoelectric cooler, a transmitter, and a coupling lens assembly, and an assembling part connected to one side of the planar part. The device further includes a circuit board bended to have a first end region and a second end region being raised to a higher level. The first end region disposed on a top surface of the planar part includes multiple electrical connection patches respectively connected to the thermoelectric and the transmitter. The second end region includes an electrical port for external connection. Additionally, the device includes a cover member disposed over the planar part. Furthermore, the device includes a cylindrical member installed to the assembling part for enclosing an isolator aligned to the coupling lens assembly along its axis and connected to a fiber to couple optical signal from the transmitter to the fiber.

A packaged transmitter device includes a base member comprising a planar part mounted with a thermoelectric cooler, a transmitter, and a coupling lens assembly, and an assembling part connected to one side of the planar part. The device further includes a circuit board bended to have a first end region and a second end region being raised to a higher level. The first end region disposed on a top surface of the planar part includes multiple electrical connection patches respectively connected to the thermoelectric and the transmitter. The second end region includes an electrical port for external connection. Additionally, the device includes a cover member disposed over the planar part. Furthermore, the device includes a cylindrical member installed to the assembling part for enclosing an isolator aligned to the coupling lens assembly along its axis and connected to a fiber to couple optical signal from the transmitter to the fiber.

A device may be provided comprising at least one optoelectronic component and at least one optical waveguide, which are configured to transfer light between the optoelectronic component and the optical waveguide, wherein the optical waveguide contains at least one first longitudinal portion in which at least one Bragg grating is introduced, which has a grating constant which is variable along the longitudinal extent of said Bragg grating, and the optoelectronic component is arranged at a lateral distance from the optical waveguide. Alternatively or in addition, a method may be provided for transferring light between at least one optoelectronic component and at least one optical waveguide.

An optical receiving engine based on planar waveguide chip includes an arrayed waveguide chip used for receiving an optical signal sent by an optical fiber, an output waveguide of the arrayed waveguide chip with a multi-mode waveguide structure, the light is incident to the arrayed waveguide chip and then being output through the output waveguide, and the light having different wavelengths corresponding to different mode field distributions of the output waveguide; a detector coupled with the arrayed waveguide chip, a photosensitive area of the detector being determined based on a mode field distribution range of the output waveguide; and an amplifier connected to the detector. The shortcoming in the prior art of low coupling efficiency can be solved. Optimizing the photosensitive area of the detector can enable the photosensitive area to match a spot mode field of the waveguide chip, thereby improving the coupling efficiency.

A cladding mode stripper, includes: a resin part that covers a coating-removed section of an optical fiber and has a refractive index not less than that of an outermost shell of the optical fiber in the coating-removed section. A surface of the resin part includes an incident angle reducing structure. The surface is opposite to an interface between the resin part and the outermost shell. The incident angle reducing structure reduces a first incident angle or a first average incident angle at which cladding mode light that has entered the resin part from the optical fiber enters the surface.

A light-receiving device includes: a light guide plate of a transparent member having a first surface and a second surface as principal surfaces opposed to each other and an emission surface formed on at least one end of the transparent member; a lens sheet having lenses and is disposed opposite to the first surface; a support member that supports the lens sheet such that a distance between the principal surface of the lens sheet and the second surface is equal to the focal distance of the lenses; a directional light-guide layer that is disposed on the second surface of the light guide plate and guides, toward the emission surface, the travel direction of an optical signal entering the light guide plate; and a receiver that receives the optical signal emitted from the emission surface of the light guide plate and converts the received optical signal into an electric signal.