Abstract: The light receptacle has: a light transmitting light receptacle main body (130); support parts (140) disposed on both ends of the light receptacle main body (130); first optical surfaces (132) to which light emitted by light-emitting elements (114) is made incident; second optical surfaces (136) that output light made incident at the plurality of first optical surfaces (132) toward the end surfaces of a plurality of light transmitting bodies (116); and four adhesive holding parts (142) that are through holes or recesses with the entire periphery thereof surrounded by the support parts and that are disposed at the four corners of the light receptacle (120) in a plane view. The light receptacle main body (130) and the support parts (140) have a plane-symmetrical shape, and the four adhesive holding parts (142) are disposed in plane-symmetrical positions.

Abstract: The film for back surface of flip-chip semiconductor according to the present invention is a film for back surface of flip-chip semiconductor to be formed on a back surface of a semiconductor element having been flip-chip connected onto an adherend, wherein a tensile storage elastic modulus at 23° C. after thermal curing is 10 GPa or more and not more than 50 GPa. According to the film for back surface of flip-chip semiconductor of the present invention, since it is formed on the back surface of a semiconductor element having been flip-chip connected onto an adherend, it fulfills a function to protect the semiconductor element. In addition, since the film for back surface of flip-chip semiconductor according to the present invention has a tensile storage elastic modulus at 23° C. after thermal curing of 10 GPa or more, a warp of the semiconductor element generated at the time of flip-chip connection of a semiconductor element onto an adherend can be effectively suppressed or prevented.

Abstract: An optical end coupling type silicon optical integrated circuit is provided using an SOI substrate. This optical integrated circuit is constituted so as to connect with an external optical circuit at an end coupling part and have signal light incident to an optical circuit that includes a curved part. In the plane of the optical integrated circuit, the position of one end coupling part selected from among any thereof and the position of any multimode optical waveguide element to which a respective optical waveguide is connected via a respective curved part satisfy a positional relationship defined on the basis of a beam divergence angle [theta] of stray light.

Abstract: According to one embodiment, a graphene photodetector includes a substrate, a first insulating film, first and second high-refractive-index regions, first and second conductive semiconductor regions, a second insulating film, a graphene film, a third insulating film, third and fourth high-refractive-index regions, a fourth insulating film, first and second electrodes, and third and fourth electrodes. The first, second, third and fourth high-refractive-index regions and portions sandwiched by the first, second, third and fourth high-refractive-index regions constituting an integrated optical waveguide.

Abstract: The present invention describes a planar waveguide-type integrated non-reciprocal polarization rotator. According to an embodiment of the present invention, the planar waveguide-type non-reciprocal 90° polarization rotator includes optical waveguide-type input and output ports, a reciprocal 45° polarization rotator based on an asymmetric optical waveguide structure, a non-reciprocal 45° polarization rotator based on an optical waveguide with a clad layer of magneto-optic material, and a phase compensator placed between the above reciprocal 45° polarization rotator and non-reciprocal 45° polarization rotator compensating the phase difference between two polarization modes.

Abstract: The inventive configurable optical fiber polarization mode coupler is capable of providing a low-loss, high-coupling coefficient interface with high accuracy and easy alignment between a plurality of optical fibers (or other optical devices) with a first channel-to-channel spacing, and an optical device having a plurality of closely-spaced waveguide interfaces with a second channel-to-channel spacing, where each end of the optical fiber coupler array is configurable to have different channel-to-channel spacing, each matched to a corresponding one of the first and second channel-to-channel spacing, and that are preferably optimized for use with photonic integrated circuits, such as coupling to dense optical input/output interfaces, wafer-level testing, etc.

Abstract: An optical fiber connector includes a main body unit having a guiding groove, and two position limiting portions that respectively protrude from two walls respectively defining two sides of the guiding groove toward each other, a sleeve unit, and a coupling unit including two coupling members each having two first protruding block portions that respectively protrude away from each other. The sleeve unit is configured to be movable rearwardly on the main body unit to press the first protruding block portions toward each other, so as to allow the first protruding block portions to pass past the position limiting portions, thereby allowing for movement of each of the coupling members between a non-working position and a working position.

Abstract: A power cable assembly device adapted to be arranged in the spaces between neighboring power cores of a power cable. The power cable assembly device includes an extruded profiled body made of a polymer material having a first, second, and third walls. The first wall being convex and having an exterior surface adapted to face a jacket of the power cable. The profiled body also having a chamber wall extending from the second to the third wall, defining a slit and adapted to receive a fiber optic cable.

Abstract: An optical signal routing device may include a first lens, second lens and a wavelength division multiplexer (“WDM”) filter positioned between the first and second lenses. The WDM filter may reflect a signal of a first wavelength with a first attenuation and pass the first wavelength signal attenuated by at most a second attenuation to the second lens, the first attenuation exceeding the second attenuation by a first predetermined amount. The WDM filter may reflect a signal of a second wavelength different than the first wavelength with at most a third attenuation, the first attenuation exceeding the third attenuation by at least a second predetermined amount. The device may further include a reflector positioned to reflect the first wavelength signal reflected by the WDM filter toward the WDM filter with at least a fourth attenuation, the fourth attenuation exceeding the second attenuation by at least a third predetermined amount.

Abstract: Methods and apparatus for controlling a bias voltage (20) supplied to an optical modulator that comprises a biasable component configurable to be biased by application of the bias voltage (20), the method comprising: providing a target for the modulator output power; applying, to the biasable component, a bias voltage (20) that biases the biasable component so that the output power is within a pre-defined range of the target; monitoring the output power and, if the output power of the modulator is determined to be outside the pre-defined range, varying the value of the bias voltage (20) to bring the output power back within the pre-defined range; and monitoring the optical input to the modulator and, if it has been disabled, maintaining the bias voltage (20) at its current level for a pre-determined length of time that is dependent upon how long the modulator has been operating at quadrature.

Abstract: The purpose of the present invention is to provide, by a configuration or method different from conventional art, a coated optical fiber enabling reduced interface delamination between a glass fiber and a primary coating layer when the coated optical fiber is immersed in water, and a reduction of transmission loss increase. A coated optical fiber according to one embodiment of the present invention is provided with a glass fiber, a primary coating layer coated on the glass fiber, a secondary coating layer coated on the primary coating layer, and a colored layer coated on the secondary coating layer. The coated optical fiber is configured so that small water bubbles are generated substantially evenly within the primary coating layer when the coated optical fiber is immersed for 200 days in warm water of 60° C.

Abstract: The inventive configurable optical fiber polarization mode coupler is capable of providing a low-loss, high-coupling coefficient interface with high accuracy and easy alignment between a plurality of optical fibers (or other optical devices) with a first channel-to-channel spacing, and an optical device having a plurality of closely-spaced waveguide interfaces with a second channel-to-channel spacing, where each end of the optical fiber coupler array is configurable to have different channel-to-channel spacing, each matched to a corresponding one of the first and second channel-to-channel spacing, and that are preferably optimized for use with photonic integrated circuits, such as coupling to dense optical input/output interfaces, wafer-level testing, etc.

Abstract: An optical module includes: a circuit board having a surface in which an electronic element is mounted; an optical waveguide array in which a plurality of optical waveguides are formed; an optical element in which an optical signal that is transmitted and received from and to the optical waveguide is input and that is mounted at a side surface of the circuit board; and a connection member that connects the optical element and the electronic element, wherein a connection portion of a side surface of the circuit board in which the connection member is received has a curved shape.

Abstract: A new photonic integrated circuit in the form of an optical pulse-train generator utilizes a time-interleaved architecture. The circuit can generate multiple optical pulses sequentially from a single trigger pulse, with the timing and amplitude of each pulse determined by circuit design. The circuit has application in optical arbitrary waveform generation and ultrafast electro-optic modulation.

Abstract: Provided is an optical fiber ribbon capable of concurrently ensuring mid-span access performance and cable production performance. The optical fiber ribbon 1 includes three or more optical fibers 2 arranged in parallel and connecting portions 3 connecting the adjacent optical fibers 2, the connecting portions 3 being formed intermittently in each of a ribbon longitudinal direction X and a ribbon width direction Y. The optical fiber ribbon 1 including the connecting portions 3 having split strength which is set in the range from 1.50 gf to 21.0 gf, contributes to exhibiting both the mid-span access performance and the cable production performance.

Abstract: A sliding tray unit for communication channel patching includes at least first and second horizontally adjacent sliding trays, with each tray including a platform with a bulkhead, with an area between the bulkhead and a front of the sliding tray being considered a trough. Lips are formed at forward edges of adjacent troughs. Each lip includes an indentation or hole. A bridging connector includes a gap formed between front and back walls. The lips fit into the gap. First and second projections formed on the back wall project into the gap and removably snap into the indentions/holes of the adjacent lips. The first and second sliding trays slide as a single unit with the bridging connector installed on both lips. The bridging connector may pivot about the engagement between a projection and its mating indentation/hole when the other projection is removed from its mating indentation/hole, so that the adjacent sliding trays may slide independently.

Abstract: A voltage controlled optical directional coupler (VCODC) having a coupling ratio that can be adjusted to any desired value through voltage tuning is disclosed. The VCODC may include a first optical hybrid coupler and a second optical hybrid coupler, which may be coupled with each other via one or more voltage controlled optical elements having a variable transparency depending on a voltage applied to the one or more voltage controlled optical elements. The VCODC may be configured to divert a portion of optical power received to a trunk input of the VCODC to a tap output of the VCODC based on the variable coupling ratio of the VCODC, which may be dependent on the variable transparency of the one or more voltage controlled optical elements.

Abstract: In various embodiments, an optical fiber module including an optical fiber having a first end, a second end, and a twisted portion between the first and second ends to enable the optical fiber to provide two orthogonal transverse bending degrees of freedom. The twisted portion induces an optical distortion. The module further includes a distortion compensation arrangement that is configured to at least partially compensate for the optical distortion and a housing that is configured to house at least a portion of the optical fiber including the twisted portion.

Abstract: An optical fiber cable management panel is provided with slidable drawers and structure within the drawers for cable management and/or connection to other devices. Tray inserts drop into the drawers to provide the appropriate management and connection devices. A movable take-up mechanism manages the cable entering and exiting the drawers at side openings. Stackable pivoting storage trays on the tray insert include a detent arrangement for holding each tray in a pivoted access position. The tray inserts further include a front key, and a back tab mounting arrangement for mounting the tray inserts to the drawers, and side radius limiters including notches for extending over raised portions of the drawer. The take-up mechanism includes a U-shaped trough section and cable retention tabs. A control mechanism is provided for controlling movement of the take-up mechanism relative to the drawer.

Abstract: A liquid crystal display device according to the present invention includes a rear light source device, a rear polarizing plate, a liquid crystal cell including liquid crystal molecules that are substantially perpendicularly aligned during black display, and a front polarizing plate, which are provided in the stated order, wherein: an absorption axis of a polarizer of the rear polarizing plate is perpendicular to an absorption axis of a polarizer of the front polarizing plate; and condensed light in which a half-value angle in a direction perpendicular to the absorption axis of the polarizer of the rear polarizing plate is smaller than a half-value angle in a direction parallel to the absorption axis of the polarizer of the rear polarizing plate enters the rear polarizing plate.