Abstract: Embodiments herein describe a method for selectively filtering different wavelengths of optical signals received from an optical channel using cascaded ring resonators, each of the cascaded ring resonators having a first ring and a second ring. The first ring has a varying waveguide width along its length configured to form a first waveguide width portion and a second waveguide width portion, the first waveguide width portion having a greater width than the second waveguide width portion. The second ring has a varying waveguide width along its length configured to form a third waveguide width portion and a fourth waveguide width portion, the fourth waveguide width portion having a greater width than the third waveguide width portion. The method further connects receivers to respective cascaded ring resonators, each of the receivers having a photodetector configured to differentiate between the optical signals.

Abstract: An optical attenuating structure is provided. The optical attenuating structure includes a substrate, a waveguide, doping regions, an optical attenuating member, and a dielectric layer. The waveguide is extended over the substrate. The doping regions are disposed over the substrate, and include a first doping region, a second doping region opposite to the first doping region and separated from the first doping region by the waveguide, a first electrode extended over the substrate and in the first doping region, and a second electrode extended over the substrate and in the second doping region. The first optical attenuating member is coupled with the waveguide and disposed between the waveguide and the first electrode. The dielectric layer is disposed over the substrate and covers the waveguide, the doping regions and the first optical attenuating member.

Abstract: An optical system includes a connector, an optical filter, an optical receiving device, an optical transmission device, and a central processing and transmission unit. The connector is configured for routing optical signals. The optical filter is configured for routing optical signals to and from the connector. The optical receiving device is configured for receiving optical signals routed from the optical filter via the connector. The optical transmission device is configured for generating the optical signals routed from the optical filter via the connector. The central processing and transmission unit is in electrical communication with the optical receiving device.

Abstract: A connector for connecting a cable to a cabinet in a manner that enhances feeding of a fiber through the connector includes first and second portions. The first portion is configured to be rotatingly coupled with the second portion; passageways in the first and second portions are configured to be positioned at a first angle relative to each other in a first position and at a second angle relative to each other in a second position; the first and second angles are different angles; the passageways in the first position are configured so as to enhance feeding of the fiber of the cable through the connector for connection of the cable to a cabinet; and the first portion is configured to be secured to the second portion in the first position so as to enhance feeding of the fiber through the connector for connection of the cable to the cabinet.

Abstract: Structures including a photonics chip and a cavity-mounted laser chip, and methods of forming such structures. The structure comprises a photonics chip including a substrate and a cavity in the substrate, a laser chip including a body inside the cavity, a first anchor disposed inside the cavity adjacent to a first corner of the body of the laser chip, and a second anchor disposed inside the cavity adjacent to a second corner of the body of the laser chip. The first and second anchors are configured to attach the laser chip to the photonics chip.

Abstract: Structures for an optical switch and methods of forming such structures. The structure comprises a first waveguide core including a first portion and a second portion, a second waveguide core including a first portion and a second portion, a ring resonator having a first portion adjacent to the first portion of the first waveguide core and a second portion adjacent to the first portion of the second waveguide core, and an optical coupler coupled to the second portion of first waveguide core and the second portion of the second waveguide core. The first portion of the ring resonator is spaced from the first portion of the first waveguide core by a first gap over a first light coupling region, and the second portion of the ring resonator is spaced from the first portion of the second waveguide core by a second gap over a second light coupling region.

Abstract: In one embodiment, an optical module includes an electronic integrated circuit, a photonic integrated circuit, and a pluggable optical coupling connector. The photonic integrated circuit sends or receives optical signals. The pluggable optical coupling connector is adjacent to the photonic integrated circuit and includes a pluggable interface to optically couple a fiber array to the photonic integrated circuit. Further, the electronic integrated circuit, the photonic integrated circuit, and the pluggable optical coupling connector are all embedded in a mold.

Abstract: One embodiment of the present disclosure relates to an optical fiber alignment method that enables highly accurate alignment of an optical fiber without applying a complicated driving system. The alignment method includes finely aligning the first and second optical fibers and finely aligning. Roughly aligning the first and second optical fibers based on a result of end-surface observation. Finely aligning the first and second optical fibers based on a result of side-surface observation in such a manner as to increase an optical coupling efficiency between each pair of the cores in the first and second optical fibers.

Abstract: A combinable optical-fiber adapter assembly includes combinable optical-fiber adapters. A first optical-fiber adapter of the adapters has first connection units. A second optical-fiber adapter of the adapters has second connection units. The first connection units are assembled with the second connection units. In a one-to-one manner, the first connection unit on the front portion of the outer side surface of the first adapter body is docked with the second connection unit on the front portion of the outer side surface of the second adapter body adjacent to the first adapter body, and the first connection unit on the rear portion of the outer side surface of the first adapter body is docked with the second connection unit on the rear portion of the outer side surface of the second adapter body adjacent to the first adapter body, so that two adjacent optical-fiber adapters can be assembled side-by-side.

Abstract: A hollow core fiber is provided. The hollow core fiber includes at least one cleaved fiber end-face and a dielectric coating. The dielectric coating is formed by a passivation layer of dielectric that is applied to the at least one cleaved fiber end-face such that a portion of an interior surface that defines a hollow core of the hollow core fiber adjacent to the at least one cleaved fiber end-face is coated with the dielectric coating.

Abstract: An optical angle modulator includes: a first unit configured to generate first angle-modulated light and second angle-modulated light by performing angle modulation on continuous light using an electrical signal; and a second unit configured to generate third angle-modulated light by causing partially degenerate four-wave mixing of the first and second angle-modulated lights. A frequency band of the first angle-modulated light and a frequency band of the second angle-modulated light are different, and an angle of the second angle-modulated light decreases due to the electrical signal while an angle of the first angle-modulated light is increasing due to the electrical signal, and the angle of the second angle-modulated light increases due to the electrical signal while the angle of the first angle-modulated light is decreasing due to the electrical signal.

Abstract: Disclosed are apparatus and methods for optical coupling in optical communications. In one embodiment, an apparatus for optical coupling is disclosed. The apparatus includes: a planar layer; an array of scattering elements arranged in the planar layer at a plurality of intersections of a first set of concentric elliptical curves crossing with a second set of concentric elliptical curves rotated proximately 90 degrees to form a two-dimensional (2D) grating; a first taper structure formed in the planar layer connecting a first convex side of the 2D grating to a first waveguide; and a second taper structure formed in the planar layer connecting a second convex side of the 2D grating to a second waveguide. Each scattering element is a pillar into the planar layer. The pillar has a top surface whose shape is a concave polygon having at least 6 corners.

Abstract: An optical phased array chip, including optical splitting stages with the number being N. Each of the optical splitting stages includes optical waveguide branches; a first end of a first thermal-optic phase shifter is connected to a preset voltage, a first end of a second thermal-optic phase shifter is grounded, and in a common optical waveguide branch, a second end of the first thermal-optic phase shifter and a second end of the second thermal-optic phase shifter are connected to a common voltage, and the first thermal-optic phase shifter and the second thermal-optic phase shifter have the same resistance. When N is greater than 1, the number of optical waveguide branches in a next optical splitting stage is twice the number of optical waveguide branches in a previous optical splitting stage. A method for controlling an optical phased array chip and a waveguide optical phased array system are also provided.

Abstract: The module device assemblies and systems described herein provide for increased cooling airflow through electronic devices via airflow channels. The module device assemblies also prevent radiation or other noise from emitting through the device assemblies using electromagnetic compatibility (EMC) shields.

Abstract: Certain embodiments of the present disclosure are directed towards an optical assembly such as a multiplexers/demultiplexers (MDM). One example optical assembly generally includes: a fiber array configured to provide an optical signal with a plurality of wavelengths; optical wavelength filters configured to separate the plurality of wavelengths into respective optical signals; a lens array configured to receive the respective optical signals from the optical wavelength filters and focus the respective optical signals before reaching an optical interface for a photonic chip; and a birefringent crystal disposed between the lens array and the optical interface.

Abstract: A pipe segment for use in construction of a pipeline comprising a pipe body and a sensing nerve network that is embedded in or coupled to the pipe body and is configured to monitor a condition of the pipe segment in real-time. The sensing nerve network comprises plastic optical fiber (POF) nerves and a nanomaterial coating covering a span of the plastic optical fiber nerves, the coating having an approximately constant diameter and the nanomaterial having a property that changes in the presence of a targeted gas, enabling detection of the targeted gas along the length of the optical fiber nerves.

Abstract: A photonic assembly includes: a composite die including a photonic integrated circuits (PIC) die and an electronic integrated circuits (EIC) die, the PIC die including waveguides and photonic devices therein, and the EIC die including semiconductor devices therein; an optical connector unit including a first connector-side mirror reflector and a first transition edge coupler and attached to a top surface of the composite die, wherein the first connector-side mirror reflector is configured to change a beam direction between a vertically-extending beam path through the composite die and a horizontally-extending beam path through the first transition edge coupler; and a fiber array units assembly attached to a sidewall of the optical connector unit.

Abstract: An optical connector has a first connection end configured to fit with a peer adapter. The electrical connector has a second connection end configured to fit with the peer adapter. The first connection end and the second connection end have a same opening direction. In addition, the first connection end may slide along a plugging direction of the peer adapter relative to the second connection end. The first connection end is configured to be connected to the peer adapter before the second connection end. The optical connector is connected to the peer adapter before the electrical connector. This ensures that a channel for transmitting an optical signal is communicated before a channel for transmitting an electrical signal is communicated, thereby avoiding fiber burning and improving security and reliability of the opto-electronic adapter during use.

Abstract: In one embodiment, an optical fiber includes an inner core having a core refractive index delta and profile shape parameter ? in the range of 1.8 to 2.6, including endpoints, and a cladding layer surrounding the inner core. The cladding layer includes an inner cladding segment having an inner refractive index delta, a trench segment having a trench refractive index delta, and an outer cladding segment having an outer refractive index delta. The optical fiber further includes a coating layer surrounding the cladding layer and having a thickness of less than 30 ?m and a modulus greater than or equal to 0.5 GPa.

Abstract: A photonic integrated circuit (PIC) includes photonic components fabricated on the PIC. One of the photonic components includes an optical coupler configured to optically couple to an optical component. The optical coupler includes waveguide elements arranged in a 2-dimensional array that is configured to provide a first mode having a first shape chosen to match a second shape of a second mode of the optical component.