246results about How to "Reduce coupling loss" patented technology

The invention relates to an optical component (1) comprising a combination of optical waveguide elements for modifying the spot size of a mode of an electromagnetic field propagated by an optical waveguide element, the optical waveguide elements being formed on a substrate. The object of the present invention is to provide a mode coupler with low coupling loss that is easy to manufacture and process tolerant. The problem is solved in that the optical component further comprises a) a first section (10), comprising a first optical waveguide element (11) adapted to sustain at least one mode of the electromagnetic field, b) a second section (20) comprising at least two cooperating optical waveguide elements (21, 22), each of said at least two cooperating optical waveguide elements comprising at least one waveguide segment, said at least two cooperating optical waveguide elements being optically connected to said first optical waveguide element of said first section; wherein said cooperating optical waveguide elements (21, 22) of said second section (20) are adapted to maintain optical coupling between said optical waveguide elements to ensure that said at least one mode of the electromagnetic field is sustained by said at least two cooperating optical waveguide elements in cooperation. Preferably, the waveguides of the first and/or second sections are tapered according to a cosine function or to a 5^th or 7^th order polynomial. An advantage of an optical component according to the invention is that it provides a mode size converter that is relatively simple to manufacture in that it requires no extra process steps. A further advantage is that it is readily suitable for integration with other optical circuitry on a common substrate. The invention may be used in optical communication systems (e.g. systems employing WDM) where coupling of light between integrated optical circuits and optical fibres are needed.

The invention relates to a production technology of an optical fiber combiner based on a capillary tube. The technology comprises the following steps of: 1) obtaining bundle fiber bundles; 2) bundling and arranging the bundle fiber bundles obtained from the step 1) by the capillary tube and forming the capillary tube which is internally embedded with the bundle fiber bundles; 3) carrying out beam combining treatment on the capillary tube internally embedded with the bundle fiber bundles obtained from the step 2) and forming a cone-shape optical waveguide. According to the invention, the production technology of the optical fiber combiner based on the capillary tube, which is convenient to fix and easy to taper, can greatly reduce energy loss in a laser combining process, and can improve a power bearing level of a beam combiner, is provided.

The invention discloses a millimetre wave planar antenna and an array thereof, wherein the millimetre wave planar antenna includes a metal patch, a medium substrate, a metal floor board and ground poles, the metal patch is placed on an upper surface of the medium substrate, and a lower surface of the medium substrate is fixed with an upper surface of the metal floor board; the metal patch is parallel to the upper surface of the metal floor board; the metal patch is provided with at least one pair of same first bar-shaped channels, each pair of first bar-shaped channels are distributed in bilateral symmetry form, symmetrical centre lines of each pair of bar-shaped channels are superposed, a centre line in a length direction of each first bar-shaped channel is parallel to each other, and length of each first bar-shaped channel is 1/2 of an operating wavelength; the ground poles vertically penetrate through the medium substrate, the ground poles are circularly distributed at intervals at the periphery of a region where the first bar-shaped channels are distributed, and two ends of each ground pole are respectively contacted with the metal patch and the metal floor board. The invention can reduce loss of a millimetre wave antenna, improve radiation efficiency of the millimetre wave antenna, simultaneously, guarantee work bandwidth of the antenna, and improve antenna gain.

An optical waveguide element capable of being coupled with optical fibers at high coupling efficiency is to be provided. Also an optical waveguide element manufacturing method permitting accurate production of such optical waveguide elements is to be provided. The optical waveguide element is provided with a buffer layer formed over a monocrystalline substrate and an optical waveguide layer formed over the buffer layer, and a recess is formed in the buffer layer along the lengthwise direction of the monocrystalline substrate. The optical waveguide layer is provided to fit into this recess to form a channel optical waveguide. Over the upper face of the optical waveguide layer on the light incidence side and the light emission side, a cladding layer whose refractive index is smaller than that of the optical waveguide layer and whose thickness increases towards the end face(s) in a flared shape is provided in the same width as that of the monocrystalline substrate. By providing the cladding layer whose refractive index is smaller than that of the optical waveguide layer, it is made possible to expand the mode field diameter and substantially reduce the coupling loss between the optical fiber and the optical waveguide element. Further by increasing the thickness of the cladding layer in a flared shape toward the end face(s), it is made possible to gradually compress the mode field diameter and to reduce the optical propagation loss within the optical waveguide.

The invention presents an ultrasonic transducer (110) used in fluid medium (118). The ultrasonic transducer (110) comprises at least one casing cover (112) with at least one casing cavity (114), in which at least one transducer core (124) is installed. The transducer core (124) comprises at least one acoustic-electro transducer element (126). At least one damping element (156) is in contact with the casing cover (112), and is equipped at an outer side of the casing cavity (114) for damping solid state sound.

A radiating coaxial cable includes an inner conductor, an electrical insulator located about a periphery of the inner conductor, and an outer conductor located about a periphery of the electrical insulator. The outer conductor defines groups of apertures spaced from each other a predetermined distance in the range of from about twice the longest operational wavelength of the cable to less than ten meters. The aperture groups are designed in such a way to excite a surface wave at low operating frequencies and a combination of surface and radiating waves at high operational frequencies.

The invention discloses a wireless charging circuit, system and method and electronic equipment. The wireless charging circuit can comprise an electric energy receiving module, a rectifying module, acontrol module and a charge pump charging module. The electric energy receiving module is used for receiving the alternating current transmitted by the electric energy transmitting module of a wireless adapter. The rectifying module is used for converting the alternating current into direct current. The control module is used for generating a first control signal in the constant current stage. Thecharge pump charging module is used for performing voltage reduction and current enhancement on the direct current when receiving the first control signal and transmitting the direct current after voltage reduction and current enhancement to a battery to be charged. Compared with the circuits in the prior art, the wireless charging circuit has no step-down conversion module; the charge pump charging module having no inductance component is used in the constant current stage; and the current of the pre-circuit of the charge pump charging module is low and the coupling loss is low in the constant current stage so that the problems of low charging efficiency and low safety in the prior art can be solved.

The invention discloses a wavelength division multiplexer which can be integrated into CFP and CFP2 standard high-speed transceivers, which comprises a filter holder and a plurality of filters, and the plurality of filters sequentially transmit light of a set wavelength and reflect the rest of the light to the bottom A filter, the filter holder is provided with an incident light inlet, and also includes a right-angle prism and a plane mirror, all filters and the incident light inlet are installed on the same side of the filter holder, and the right-angle prism and the plane mirror are installed on the filter The other side of the sheet holder is arranged opposite to all the filters. The oblique surface of the rectangular prism refracts the incident light to the nearest filter, and each filter transmits the light of the set wavelength and reflects the light of the remaining wavelengths to the flat mirror behind the flat mirror. Reflected to the next filter; the invention can greatly compress the size of the device, not only can be applied to high-speed transceivers, but also can save production costs, reduce product footprint, and have higher stability than traditional coarse wavelength division multiplexing , with a wide range of applications.

The invention discloses a wireless charging circuit, method and system and electronic equipment. The wireless charging circuit comprises an electric energy receiving module, a rectifying module and acharge pump charging module. The electric energy receiving module is used for receiving the alternating current transmitted by the electric energy transmitting module of a wireless adapter and transmitting the alternating current to the rectifying module. The rectifying module is used for converting the alternating current into direct current and transmitting the direct current to the charge pumpcharging module. The charge pump charging module is used for performing voltage reduction and current enhancement on the direct current and transmitting the direct current after voltage reduction andcurrent enhancement to a battery to be charged. Compared with the circuits in the prior art, the charge pump charging module is used as the charging module of the wireless charging circuit, and the internal charge and discharge element is the capacitor rather than the inductor; besides, the current of the pre-circuit is enabled to be low and the coupling loss is enabled to be low by the charge pump charging module so that the problems of low charging efficiency and low charging safety can be solved.

A high-power, tunable and narrow linewidth external cavity semiconductor laser belongs to the technical field of a semiconductor laser and aims to solve the problem that the comprehensive requirements such as mode characteristic, beam quality, linewidth, coherence and tunability of a single laser are difficult to be met. The high-power, tunable and narrow linewidth external cavity semiconductor laser is formed by directly coupling a gain chip, a tunable external cavity and an inclined power amplifier with a curved waveguide through an end surface, wherein the gain chip is used for achieving laser output of single-mode wide spectrum; the tunable external cavity adopts a silicon on insulator (SOI) material; the linewidth is narrowed by increasing cavity length and a quality factor Q of a laser resonant cavity; the tunability is achieved by the adoption of refractive index of a thermal modulation material; and by the arrangement of the inclined power amplifier with curved waveguide, laser output with high power and high beam quality is achieved under ensuring the stability of the gain chip and the tunable external cavity. By the high-power, tunable and narrow linewidth external cavity semiconductor laser, a novel semiconductor laser integrating a single mode, high power, high beam quality, narrow linewidth, high coherence, tunable wavelength and the like is achieved, and the high-power, tunable and narrow linewidth external cavity semiconductor laser has important application prospect in the fields such as space laser communication and laser radar.

The invention relates to wavelength division multiplexing technology in the field of light transmission, in particular to an AWG (arrayed waveguide grating) wavelength division multiplexer, which comprises an input waveguide, an input planar waveguide, an arrayed waveguide and an output slab waveguide, and an output waveguide which are connected in sequence, wherein the sections of the input waveguide and the output waveguide respectively comprise a core layer and a covering layer covering the core layer, and the refractive index of the core layer is larger than that of the covering layer. The differences are that one end of the output waveguide, which is connected with the output slab waveguide, is provided with the output waveguide with an air slot; and the output waveguide with the air slot is a high-refractive index difference waveguide, wherein two sides of the core layer of high-refractive index difference are respectively etched with an air slot. The AWG wavelength division multiplexer has the advantages that the volume is small, the coupling loss between optical fibers is little, the wave length amplitude correlation of AWG is good, and the anti-crosstalk property between channels is excellent.

The invention discloses a 780 nm high-power optical-fiber femtosecond laser device. The laser device comprises a laser device seed source, a laser spreading and amplifying module, a laser compression module and a laser frequency doubling module, the laser device seed source and the preceding modules are sequentially connected, the laser spreading and amplifying module is composed of a chirped pulse spreading sub module, a pulse separation sub module and an optical fiber amplifying sub module, and the laser device seed source and the modules all work at the waveband of 1560 nm. A mixed pulse spreading mode is adopted, pulses are spread from 100 fs to 1ns in a small work space, the amplified pulses are compressed to below 100 fs through non-linear compression of a single-mode fiber, and ultimately the pulses reach 780 nm after frequency doubling of non-linear crystals. The laser device has the advantages of being high in stability, simple in structure, small and ingenious in size, low in cost and the like.

The invention relates to an optical waveguide structure of a photoelectric detector for vertical coupling. The structure comprises an intrinsic layer, an absorption layer, an upper waveguide layer, a clearance layer, a lower waveguide layer, a cover layer and a substrate which are sequentially stacked from top to bottom, wherein the clearance layer is used as a low-refractive index coupling layer between the upper waveguide layer and the lower waveguide layer; and a vertical coupler (equivalent to a vertically-coupled photoelectric diode) composed of the upper waveguide layer and the lower waveguide layer is used for realizing that the light enters from the lower waveguide layer and is gradually coupled to the upper waveguide layer and transmitted in the upper waveguide layer and the lower waveguide layer while being absorbed by the absorption layer. The structure provided by the invention has the beneficial effect of overcoming the defects that the coupling length and the absorption length are changed when the air clearance in the horizontally-coupled photoelectric diode structure changes and the photoetching corrosion processing technology is difficult.

The invention relates to a graphene mid-infrared detector based on phonon exciton enhancement and a preparation method thereof, and belongs to the technical field of mid-infrared detection. The graphene mid-infrared detector comprises a silicon substrate, a silicon dioxide layer, a graphene layer and a molybdenum trioxide micro-nanostructure array covering the graphene layer which are laminated inturn from bottom to top, wherein the molybdenum trioxide micro-nanostructure array and the graphene layer form a phonon exciton enhanced heterostructure; and the edge of the graphene layer is provided with an electrode above, and the electrode extends an overlapping region of the molybdenum trioxide micro-nanostructure array and the graphene layer. In order to solve the technical problems, the graphene mid-infrared detector achieves the purposes of greatly improving the photoelectric conversion efficiency in the mid-infrared band and being simple in preparation method and low in cost.

A wavelength selective grating-based filter includes a planar waveguide which includes a core surrounded by a cladding, the cladding including a lower cladding, the core being placed above the lower cladding, a lateral cladding adjacent to a first and a second opposite lateral sides of the core, and an upper cladding, said upper cladding being positioned above said core and lateral cladding. The waveguide also includes a grating structure, including a first and a second plurality of grating trenches formed in the lateral cladding in proximity of the first and second opposite lateral sides of the core, respectively. The first and second plurality of grating trenches are covered by the upper cladding.

The invention belongs to the field of integrated optics, and particularly relates to a silicon-based integrated optical isolation device based on a topology protection mechanism. By adjusting the boundary states of the linear defect photonic crystal module and the topological non-uniform low group velocity photonic crystal module, the excitation and coupling regulation and control of the low groupvelocity boundary state are realized. According to the invention, the line defect photonic crystal waveguide with low group velocity is used as a transition coupling structure, so that the group velocity is matched while the coupling loss is reduced. The boundary state propagated in the photonic crystal has low group velocity and good locality, so that the size of the device is greatly reduced, and the loss is low; an isolator of TE polarization can be conveniently obtained; and in addition, steep bending transmission can be obtained through design. The invention provides a new mechanism of the optical isolation device; the processing tolerance can be obviously improved, and the stability and the expansibility are good; the design may be on-chip integrated using a semiconductor process.

An all-fiber pulsed fiber laser device with a composite chamber comprises a semiconductor laser pumping source driven by a semiconductor laser pumping source driving module, a fiber wavelength division multiplexer, a gain medium fiber, a first optoisolator, a photo-coupler, a pigtailed photoswitch driven by a photoswitch driving module, and a second optoisolator, wherein an output terminal of the semiconductor laser pumping source is connected with a short wavelength input terminal of the fiber wavelength division multiplexer, an output terminal of the fiber wavelength division multiplexer is connected with an input terminal of the photo-coupler by successively passing through the gain medium fiber and the first optoisolator, an output terminal of the photo-coupler serves as an output terminal of the laser, one end of the pigtailed photoswitch is connected with a long wavelength input terminal of the fiber wavelength division multiplexer via the second optoisolator, a cascading interference chamber is arranged between the photo-coupler and the pigtailed photoswitch, an input terminal of the cascading interference chamber is connected with a feedback output terminal of the photo-coupler, and an output terminal of the cascading interference chamber is connected with the other end of the pigtailed photoswitch.

The invention provides a silicon-based light transmitting-receiving component with parallel optical fiber transmission. The silicon-based light transmitting-receiving component with parallel optical fiber transmission comprises a silicon substrate, multiple electrodes, multiple lasers/detectors, multiple lenses, multiple optical fiber heads and an optical fiber cover plate, wherein the silicon substrate comprises a surface plane which is provided with recess parts, multiple wire slots and positioning parts; the positioning parts and the front ports of the wire slots are spaced by the recess parts; the electrodes are arranged in parallel and are arranged on the front section of the surface plane in a convex manner; the lasers/detectors are connected to the electrodes and are mounted on the surface plane through the positioning parts; the lenses are mounted in the recess parts to correspond to the lasers/detectors; the optical fiber heads are arranged in the wire slots; one ends of the optical fiber heads close to the lenses are covered with the optical fiber cover plate. Through the structure or the combination thereof, the silicon-based light transmitting-receiving component is realized, and accordingly the good effects of reducing the volume, bringing convenience to the manufacturing and lowering the cost are achieved.

The invention discloses a wireless charging circuit, system and method and electronic equipment. The wireless charging circuit comprises an electric energy receiving module, a rectifying module, a control module, a step-down conversion module and a charge pump charging module. The electric energy receiving module is used for receiving the alternating current transmitted by the electric energy transmitting module of a wireless adapter. The rectifying module is used for converting the alternating current into direct current. The control module is used for generating a first control signal in theconstant current stage. The step-down conversion module is used for adjusting the direct current according to the first control signal. The charge pump charging module is used for reducing the voltage of the adjusted direct current to the charging voltage and enhancing the current of the adjusted direct current to the charging current. Compared with the circuits in the prior art, the charge pumpcharging module having no inductance component is used as the charging module in the constant current stage so that the charging efficiency can be enhanced; besides, the current of the pre-circuit ofthe charge pump charging module is low and the coupling loss is low so that the charging efficiency can be further enhanced.