144results about How to "Reduce connection loss" patented technology

The present invention provides a device for optical communication comprising: a substrate for mounting an IC chip having a light emitting element and a light receiving element mounted at predetermined positions; and a multilayered printed circuit board having an optical waveguide formed at a predetermined position, which is low in connection loss among the mounted optical components and which has excellent connection reliability. The device for optical communication according to the present invention comprises the substrate for mounting an IC chip and the multilayered printed circuit board, wherein the substrate for mounting an IC chip includes conductor circuits, interlaminar insulating layers and via-holes for connecting the conductor circuits, with the interlaminar insulating layers interposed therebetween, to each other, and a light receiving element and a light emitting element are mounted on the substrate for mounting an IC chip.

The invention provides a Ka-band tilt-structure active phased array antenna, so as to provide an active phased array antenna which is high in integration density and can improve maintainability and interchangeability. According to the technical scheme, one path of RF signals transmitted by a transmitting signal processing terminal are transmitted to a power distribution / synthesis network (5) via a signal interface and a radio frequency interface to be divided into M paths of signals; according to information of an azimuth angle and a pitch angle of the phased array antenna provided by the transmitting signal processing terminal in real time, a beam controller (4) calculates and obtains beam pointing of the phased array antenna in real time through an FPGA; the beam pointing of the phased array antenna is converted into phase data needed by each array element under control of the beam controller (4); the data are transmitted to tilt-type TR assembly sub array modules in N channels respectively via a high and low-frequency interconnected multi-core high and low-frequency socket, and under control of the beam controller, M*N paths of signals are transmitted to an antenna array, and thus signal transmission is completed, and synchronous electric control scanning of beams transmitted by the phased array antenna is realized.

The present invention provides a device for optical communication comprising: a substrate for mounting an IC chip having a light emitting element and a light receiving element mounted at predetermined positions; and a multilayered printed circuit board having an optical waveguide formed at a predetermined position, which is low in connection loss among the mounted optical components and which has excellent connection reliability.The device for optical communication according to the present invention comprises the substrate for mounting an IC chip and the multilayered printed circuit board, wherein the substrate for mounting an IC chip includes conductor circuits, interlaminar insulating layers and via-holes for connecting the conductor circuits, with the interlaminar insulating layers interposed therebetween, to each other, and a light receiving element and a light emitting element are mounted on the substrate for mounting an IC chip.

The invention provides a PLC-type DP-QPSK demodulator that reduces connection loss between a polarization beam splitter and a 90-degree hybrid circuit and aims at reducing the manufacturing cost and an optical transmission system using the same. In an embodiment of the invention, a PLC-type DP-QPSK demodulator that receives a DP-QPSK signal includes one PLC chip having a planar lightwave circuit. Input ports and output ports of signal light are provided at an input end and at an output end of the PLC chip, respectively. Within the planar lightwave circuit, there are integrated a polarization beam splitter that splits the DP-QPSK signal into an X-polarization QPSK signal and a Y-polarization QPSK signal, and two 90-degree hybrid circuits that mix the X-polarization QPSK signal and local oscillation light and the Y-polarization QPSK signal and local oscillation light, respectively, split each QPSK signal into orthogonal components I, Q and output them.

A laminated polymer optical waveguide including two or more optical waveguide films each of which includes an optical waveguide core on a light-transmissive clad film, the two or more optical waveguide films being laminated on each other by using a clad-forming curable resin having a refractive index close to that of the light-transmissive clad film. The laminated polymer optical waveguide includes, at an end thereof, plural strip-shaped structures which each include at least one optical waveguide core and which can be each independently bent in the direction along which the optical waveguide films are laminated.

A flexible optical waveguide having a core in which light propagates; and a cladding portion with a smaller refractive index than the core, that surrounds the core, wherein the flexible optical waveguide has a flexible portion between both end portions thereof, and at least one end portion of the both end portions is more solid than the flexible portion, is provided, which flexible optical waveguide, while assuring flexibility, can be mounted with high accuracy.

An object of the present invention is to provide an optical transmission structural body capable of preferably transmitting an optical signal between an optical wiring and an optical waveguide irrespective of a shape of a portion of the optical wiring, the portion being connected to a core part of the optical waveguide. The optical transmission structural body of the present invention is constituted so that at least an optical wiring and an optical waveguide are connected to each other and an optical signal can be transmitted between a core of the optical wiring and a core part of the optical waveguide, wherein a portion of the optical wiring, the portion being connected to the core part of the optical waveguide, is not specially subjected to a planarization processing or has a surface roughness Ra based on JIS B 0601 of 0.1 μm or more.

The invention discloses a full-duplex active phased filter antenna array surface, and aims at providing an antenna array surface with high-isolation array transmitting and receiving and good filter characteristic. A transmitting antenna array surface of a transmitting array antenna and a receiving antenna array surface of a receiving array antenna consist of a plurality of arrayed radiation units;a multi-layer printed board integrally integrating a radiation circuit, a feed switching circuit and a filter circuit achieves connection between different circuits by vertical interconnection structures of metallized via holes; a metal upper cavity body of a transmitting-receiving component serves as a metal ground; a metal upper cavity body base of a metal floor is consubstantially connected byradio-frequency fuzz button connectors; and then a radiation unit and transmitting-receiving component integrated box-type submatrix module filter antenna unit is formed. With the adoption of the full-duplex active phased filter antenna array surface, high-isolation array transmitting and receiving can be achieved; insertion losses of array transmitting and receiving can be reduced; and high-precision amplitude and phase control can be achieved.

In an optical fiber ribbon 1 according to the present invention, four optical fibers 10, 20, 30 and 40 are arranged in parallel to each other in a plane, a part of the periphery of these four optical fibers is covered with a ribbon matrix 51, but no rest thereof is covered with the ribbon matrix. First areas covered with the ribbon matrix 51 and second areas uncovered with the ribbon matrix alternate with each other along the longitudinal direction thereof. Alternatively, the optical fiber ribbon 1 is covered with the ribbon matrix over its entire length. In the glass section of each optical fibers, the mode field diameter defined by the definition of Petermann-I at a wavelength of 1.55 μm is 8 μm or less, and the cable cutoff wavelength is 1.26 μm or less.

An optical device includes an optical waveguide, an optical element, and a resin layer disposed between the optical waveguide and the optical element. The resin layer is formed of a photocurable material alone or in combination with a thermosetting material and includes an optical interconnect for optically connecting the optical waveguide and the optical element. The optical interconnect has a higher refractive index than a region of the resin layer around the optical interconnect. A method for producing the optical device includes providing the photocurable material between the optical waveguide and the optical element, partially irradiating the photocurable material with light to form the optical interconnect, and secondarily irradiating the overall photocurable material with light to cure the overall resin layer.

An optical module includes an under cladding, a first core, a second core, and an over cladding. The under cladding has a flat shape as a whole. The first core has a quadrangular cross section and is placed on the under cladding. The second core is placed on a terminal end portion of the first core. The over cladding is placed in a region including the terminal end portion of the first core and the second core placed on the terminal end portion of the first core. The under cladding and the first core placed thereon constitute a first optical waveguide. The under cladding, the terminal end portion of the first core placed on the under cladding, the second core placed thereon, and the over cladding placed on and around the second core constitute a mode field size conversion portion. The under cladding, the second core placed on the under cladding, and the over cladding placed on and around the second core constitute a second optical waveguide. The first core is made of silicon. The first and second cores differ in cross-sectional shape. A manufacturing method for the optical module is also disclosed.

The invention discloses a few-mode fiber based Raman distributed temperature measurement system and a temperature measurement method. The temperature measurement system comprises a pulse laser light source, a coupler, special connector, a few-mode fiber, a Raman filter, two photoelectric detectors and a signal processor, and is characterized in that pulse laser outputted by the coupler gets into the few-mode fiber through the special connector, and back-scattering light is generated in the transmission process of the pulse laser in the few-mode fiber; the back-scattering light is inputted into the Raman filter through a back output port of the coupler, and the Raman filter carries out filtering on Raman Stokes light and Raman anti-Stokes light respectively; the two photoelectric detector respectively receive scattered light outputted from the two ports and carry out photoelectric conversion; and the signal processor carries out processing on outputted electric signals so as to acquire temperature information. According to the invention, the few-mode fiber is low in transmission loss, and the intermodal dispersion is far less than that of a multi-mode fiber, thereby not only increasing the detecting distance of the temperature measurement system, but also improving the spatial resolution of the temperature measurement system.

The invention is applicable to the technical field of optical fiber adapters, and provides an optical fiber adapter comprising a shell component. The shell component is provided with an open cavity, a blocking plate structure used for elastically blocking the open cavity is arranged in the open cavity or at the position of an opening of the open cavity. The blocking plate structure comprises a first door plate and a second door plate jointly blocking the open cavity, the first door plate is rotationally connected to one side of the open cavity, and the second door plate is rotationally connected to the other side of the open cavity. Elastic pieces are arranged between the first door plate and the shell component as well as between the second door plate and the shell component. The optical fiber adapter high in safety and reliability can prevent human eyes from directly looking at lasers therein, external impurities such as dust can be prevented from entering the inside of the optical fiber adapter and being attached to optical fibers to affect communication performance of the optical fibers, and connection loss of the optical fiber adapter is lowered beneficially.

The invention relates to a multilayer rare earth ion ring doped core fiber. The center of the fiber is a silicon core area (1), and rare earth doped ion ring cores from (41) to (4N) are distributed outside the silicon core area (1) from the inside to the outside, wherein N is not less than 2 and not more than 10, and a coating layer (3) is distributed outside the Nth rare earth doped ion ring core (4N); silicon ring cores from (21) to (2K) are distributed among the rare earth doped ion ring cores from (41) to (4N) and the coating layer (3), and K is not less than 0 and not more than N; the refractive indexes of all the earth doped ion ring cores are the same, the refractive indexes of all the silicon ring cores and the silicon core area (1) are the same, and the refractive index of the silicon core area is lower than that of the rare earth doped ion ring cores; and the refractive index of the coating layer is lower than that of the silicon core area. The fiber can amplify multiband signal light amplification or self-organize coherent bundles and has the advantages of high pumping efficiency, high heat resistance, compact structure, and the like.

In a conversion sleeve comprising a large diameter part, a small diameter part, and a tapered diameter part interconnecting said two parts, a ferrule insertion stop part is formed on an inner circumferential surface of the tapered diameter part and / or inner circumferential surfaces of the large diameter part and the small diameter part adjacent to the tapered diameter part. An optical adapter comprises a split sleeve having a slit formed therein throughout the entire length in the longitudinal direction thereof, particularly a conversion sleeve, and an adapter housing having a sleeve retaining part in which the sleeve is inserted and retained. The sleeve retaining part is provided with an engagement part comprising a recessed portion or / and a projected portion. The split sleeve is provided with a counter engagement part comprising a projected portion or / and a recessed portion which engages with the recessed portion or / and the projected portion of the engagement part.

An optical fiber connector has a first ferrule holding an end of a first optical fiber, a first fiber stub connected to the first ferrule, a second ferrule holding an end of a second optical fiber, and a second fiber stub connected to the second ferrule. The first fiber stub enlarges the beam diameter of light transmitted through the first optical fiber, and produces the collimated light. The second fiber stub reduces the beam diameter of the collimated light, and leads the converging light into the second optical fiber. The first and second fiber stubs are detachably connected inside a connection sleeve across a predetermined gap. First and second GI fibers contained in the first and second fiber stubs satisfy L1≧L2 and L1+L2≅½ pitch, wherein L1 and L2 represent the lengths of the first and second GI fibers, and one pitch is a sinusoidal period of the light transmitted therethrough.

An optical ferrule butt-connected in an optical adapter, includes: a ferrule main body; a connection end face in a front surface of the main body; a pair of grooves on the connection end face of the main body; guide pin insertion holes in bottom surfaces of the respective grooves; optical fiber insertion holes in the connection end face, the holes being arranged in a line; and foreign material collecting portions at least at a pair of corresponding sides of the connection end face. The groove has a width larger than a diameter of the guide pin insertion hole. The foreign material collecting portions respectively have a wall for connecting the connection end face with a side surface of the ferrule main body to form a space for collecting a foreign material with an opposite connection end face of a corresponding optical ferrule and an inner wall of the optical adapter.

The invention discloses a dual-mode optical fiber and a communication system thereof. The dual-mode optical fiber comprises an optical fiber core and a cladding, and in a wavelength range of between 1.25 and 1.65mu m, nclad-ncore is more than 0.004, and r is more than 4.5mu m, wherein the nclad is the cladding refractive index, the ncore is the optical fiber core refractive index, and the r is radius of the optical fiber core; the cut-off wavelength lambda c of an LP02 model of the optical fiber is between 1.1 and 1.25mu m, and the optical fiber maintains dual-mode transmission; and the mode field diameter M of the optical fiber equals to 8 to 10.5mu m at the wavelength of 1,310nm. The optical fiber communication system comprises a dual-mode optical fiber, a single-mode optical fiber, a light transmitter and a light receiver, wherein two ends of the dual-mode optical fiber are connected with the single-mode optical fiber respectively; and the other ends of the single-mode optical fiber are connected with the light transmitter and the light receiver respectively. The dual-mode optical fiber has low bending loss and large mode field, and the communication system can realize single-mode transmission and low connection loss of a broad range.

The invention provides a 3D integrated framework of an ultrahigh frequency power converter. The 3D integrated framework comprises a PCB circuit layer and a winding unit erected on the PCB circuit layer. The winding unit is connected with the PCB circuit layer through a wire. The winding unit comprises winding layers formed on a first insulating layer and a first soft magnetic thin film layer formed on a second insulating layer. The first soft magnetic thin film layer is arranged below the winding layers in a laminated mode to be used for achieving magnetic shielding between the winding layers and the PCB circuit layer. Compared with the prior art, by the adoption of 3D integration, the size of the converter is reduced, and the power density is increased; soft magnetic materials are adopted to form the magnetic shielding layer, magnetic field interference between windings and the PCB circuit layer and between the windings and external metal is solved, the Q value of the windings is increased, the alternating current resistance and high-frequency loss of an inductor and a transformer are reduced, and the working efficiency of the converter is improved; a plane magnetic element is further adopted, and the miniaturization and flattening of products are guaranteed; temperature rising of the magnetic element is reduced greatly, and the working environment of a semiconductor device is improved.

A coaxial light-guide system includes a coaxial light-guide optical fiber which is fabricated by having refractive index profile set on radii. Thus the coaxial circular outer-cladding and the axial inter-cladding have the same refractive index. The light guide refractive index profile center is moved from the axis to the entire radii of the optical fiber. Light propagates between the axial inter-cladding and the coaxial circular outer-cladding. Such a new positioning prevents center-dip in the refractive index profile that occurs to the prior optical fiber after fabrication is finished. The coaxial single-mode optical fiber of the invention has a greater optical flux than the prior optical fiber, and can increase communication distance. Coupled with a coaxial light source and photodiode of the invention that have an coaxial inner and outer conductors to supply electric power and a plurality of annular semiconductor layers interposed therebetween, energy waste caused by prior edge-emitting elliptic light source injecting in a circular core can be eliminated.

An electronic member capable of reducing a loss of light until reaching the end of an operation shaft and enhancing the illumination intensity at the end of the operation shaft, and a rotary electronic component constituting the electronic member. The electronic member includes a rotary electronic component having a hollow hole penetrating in a direction of a shaft, a wiring board on which the rotary electronic component is mounted, an illuminating device mounted on the wiring board at one end of the hollow hole, and a light guide body being inserted in the hollow hole and guiding light emitted from the illuminating device to another end of the hollow hole.

This invention discloses a three diamensions multilayer vertical catenation light interconnecting structure and its photoetching manufacture method. Perpendicular waveguide input and output section, s shape bent slope structure, cuboid structure and plane light transmission waveguide are on the surface of baseplate. S shape bent waveguide is on the surface of s shape bent slope structure. Perpendicular waveguide input and output section if on the surface of cuboid structure. Perpendicular waveguide input and output section that is on the baseplate links that on the cuboid structure by bent waveguide of s shape. Two ends of s shape bent waveguide respectively coaxially link perpendicular waveguide input and output section. The implements vertical multilayer light interconnecting with short span, solves upward or decurrent perpendicular catenation of optical path, makes integrated structure. Alignment error of layers is small. Connection loss is low. The invention is easy to implement photoetching transferring print. The invention can sufficiently display superiority of three diamensions transferring print about high polymer transferring print. The invention is easy to install. Materials are selected from optical high polymer. It has small optical loss and good environment stability.

An optical waveguide comprising a core and a clad characterized in that a desired part is heated and transited to machining strain release state, the part transited to the machining strain release state is curved with a specified bending radius and transited to machining strain state. That part of the optical waveguide is heated to a temperature within a range between the bending point and softening point and transited to machining strain state. The optical waveguide is an optical fiber having the outer diameter not shorter than 50 μm. The optical waveguide has the outer diameter not shorter than ten times of the mode field diameter of the optical waveguide. The optical waveguide has a bending radius of 5.0 mm or less and difference equivalent of refractive index &Dgr;1 between the core and clad falls within a range of 0.8-3.5%.

The invention discloses a novel miniaturized broadband SW-SIW horn antenna and a design method thereof. Periodic grooves are formed in a top metal plate and a bottom metal plate and coupling capacitance is made between the upper and lower grooves, thereby affecting the electrical performance parameter of a dielectric substrate; and thus the propagation constant and impedance characteristic of thedielectric layer change to affect the electromagnetic wave transmission, thereby forming slow wave characteristic. On the basis of the two kinds of slow wave structures formed by the slotting, electromagnetic waves are changed from spherical waves to plane waves at a radiation port of the horn antenna, so that the radiation lobe width is reduced and the radiation efficiency of the antenna is improved. Compared with the traditional horn antenna, the disclosed novel miniaturized broadband SW-SIW horn antenna has advantages of high directivity, wide frequency band, high gain, greatly improved radiation efficiency, low profile, small size, low connection loss with the planar circuit, good integration implementation effect, simple structure, great easiness in processing, and low engineering application cost.

An optical fiber component comprises an optical element (1), a pair of PhC fibers (2a, 2b) with a large MFD (approximately 30 to 50 μm), and a pair of SM fibers (3a, 3b) with a small MFD (approximately 10 μm). The pair of the PhC fibers (2a, 2b) has cores (21a, 21b) for transmitting light and clads (22a, 22b) provided on the outer periphery of the cores (21a, 21b). An output end of a first PhC fiber (2a) is optically connected to a light incident end-face (1a) of the optical element (1) with the first PhC fiber output-end aligned with the optical axis of the optical element (1). An input end of a second PhC fiber (2b) is optically connected to a light exit end-face (1b) with the second Phc fiber input end aligned with the optical axis of the optical element (1). An output end of a first SM fiber (3a) is optically connected to the input end of the first PhC fiber (2a) with the first SM fiber output-end aligned with the optical axis of the first PhC fiber. An input end of a second SM fiber (3b) is optically connected to an output end of the second PhC fiber with the second SM fiber input-end aligned with the optical axis of the first PhC fiber.

An adhesive connecting member and an optical connecting structure using the member, in which connection loss can be reduced and handling is facilitated, are provided. The adhesive connecting member optically connects an optical transmission medium and another optical transmission medium or an optical part by being intervened therebetween, and the member has a strongly adhesive face contacting the optical transmission medium and a weakly adhesive face contacting the other optical transmission medium or optical part. In addition, by this adhesive connecting member, the optical transmission medium and the other transmission medium or optical part can be optically connected.