141results about How to "Reduce connection loss" patented technology

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 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 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 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.

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 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.

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.