111results about How to "Improve optical coupling efficiency" patented technology

The invention discloses a waveguide coupling type separate absorption and multiplication avalanche diode, which relates to the field of semiconductor photoelectric devices and the field of optical interconnection. The waveguide coupling type separate absorption and multiplication avalanche diode comprises a p plus type ohmic contact electrode, a p plus type ohmic contact layer, an absorption layer, a p type charge region, a multiplication region, an n plus type ohmic contact electrode, an n plus type ohmic contact region, an insulated burial layer, a substrate and a single-mode waveguide; the waveguide coupling type separate absorption and multiplication avalanche diode is characterized that the p type charge region is positioned at the tail end of the single-mode waveguide, the absorption layer is positioned at the top part of the p type charge region, the multiplication region and the n plus type ohmic contact region are coplanar with the single-mode waveguide and are tightly close to the p type charge region to be sequentially arranged, stretching directions of the p type charge region, the multiplication region and the n plus type ohmic contact region are vertical to a light transmission direction of the single-mode waveguide, and the p type charge region, the multiplication region and the n plus type ohmic contact region are in the same thickness with the single-mode waveguide. According to the waveguide coupling type separate absorption and multiplication avalanche diode disclosed by the invention, the optical coupling efficiency is increased by a device by utilizing the coupling of the single-mode waveguide while the separate absorption and multiplication is realized, a disturbance phenomenon of electric signals of double multiplication regions is avoided, the size of the device can be reduced to nanometer size, the transition time and the dark current can be reduced, and the sensitivity is increased.

The invention discloses a parallel optical structure double receiving and double transmitting box seal packaging optical device comprising a box seal tube shell having a multilayer ceramic circuit. Afirst flexible circuit board and a second flexible circuit board are electrically connected on the circuit of the multilayer ceramic circuit outside the box seal tube shell. The box seal tube shell isinternally provided with a first laser, a second laser, a first photodiode, a second photodiode, a first trans-impedance amplifier, a second trans-impedance amplifier, a reflecting mirror, a first filter, a second filter, a third filter, a fourth filter, a first collimating lens, a second collimating lens, a first focusing lens and a second focusing lens. The outer side of the third filter insidethe box seal tube shell is provided with a common end lens. The position, which is close to the common end lens, of the outside of the box seal tube shell is provided with an optical fiber insertingcore sleeve component. The degree of integration of the optical device can be enhanced, the volume can be reduced, the packaging process can be further simplified and the coupling efficiency of the device can be enhanced.

The present invention relates to a high-speed quantum key distribution method. The method includes the following steps that: after the first photon of an entangled photon pair emitted by an entanglement source in a transmitting terminal is triggered, and the time label A of each signal is recorded, after the second photon and laser emitted by a light source are combined together, reflected light and transmitted light are obtained, part of light is detected from the reflected light is selected so as to be detected, the time label B of each signal is recorded, and the remaining part of the reflected light is outputted to a receiving end; delaying processing is performed on the transmitted light, so that delayed light can be obtained; the receiving end selects part of light from received light so as to detect the selected light, records the time label C of each signal, sequentially modulates and amplifies the remaining part of the received light, and outputs the modulated and amplified received light to the transmitting end; and the transmitting end selects part of light from received light so as to detect the light, records the time label D of each signal, and performs zero-difference detection on the remaining part of the received light and the delayed light. With the high-speed quantum key distribution method of the invention adopted, the accuracy of channel safety assessment and the optical efficiency of a transmitting system are significantly improved, and the security of a two-way communication link can be greatly improved.

The invention discloses an optical module structure. The optical module structure comprises a first optical element, a second optical element and a prism. The prism is a lens with a triangular or trapezoid cross section and is positioned below an optical action part of the first optical element. The prism is provided with a first side surface, a second side surface and a total internal reflection inclined plane, wherein a first spherical raised part is also formed on the first side surface, and a second spherical raised part is also formed on the second side surface. Lights which are sent from the first optical element are emitted into the prism through the first spherical raised part to form parallel lights, are turned for 90 degrees through the total internal reflection inclined plane, are emitted from the prism through the second spherical raised part to form focus convergent lights and are received by the second optical element. The prism can turn the lights of the optical elements, and the spherical raised parts of the prism can appropriately correct the divergence angels of the lights.

The invention relates to a quantum well infrared focal plane photosensitive element chip with a grating in a bottom coupling mode and a preparation method thereof; therefore, problems that a manufacturing process of a focal plane photosensitive element chip is simplified and grating coupling efficiency is improved can be effectively solved. The chip is characterized in that: a transmission grating that is formed by n type gallium arsenide and Au in an alternative and periodic arrangement is formed on a gallium arsenide substrate; a lower contact layer is arranged on the transmission grating; multi-quantum well layers are formed on the lower contact layer; upper contact layers are formed on the multi-quantum well layers; Au reflecting layers are arranged on the upper contact layers; alloy upper electrodes are arranged on the Au reflecting layers; an alloy common lower electrode is formed on one end of the lower contact layer; and silica passivation layers are formed at two sides of thelower contact layer, the multi-quantum well layers, the upper contact layers, the Au reflecting layers, the alloy upper electrodes and the alloy upper electrodes. According to the preparation method,a wafer bonding technology and a conventional semiconductor technology are employed to place a transmission grating at the bottom of multi-quantum well layers, so that an integrated structure is formed. According to the invention, the structure is novel and unique; optical coupling efficiency is improved; and the manufacturing technology and the method are simple.

The invention provides a superconducting nanowire single photon detector fabricated on a micro-nano fiber surface. The superconducting nanowire single photon detector comprises a micro-nano fiber and a superconducting nanowire, wherein the superconducting nanowire is arranged on the micro-nano fiber surface, and the length direction of the superconducting nanowire is consistent with the length direction of the micro-nano fiber. In the superconducting nanowire single photon detector, the superconducting nanowire is formed on the micro-nano fiber surface, direct and high-efficiency optical coupling of the micro-nano fiber and the superconducting nanowire can be achieved by means of optical transmission and coupling characteristics of the micro-nano fiber on a micro-nano scale, and the optical coupling efficiency of the superconducting nanowire single photon detector is improved; compared with a traditional device, the effective area of the superconducting nanowire is not limited by the size of an end surface of the fiber, the length of the superconducting nanowire can be reduced, thus, the dynamic inductance of the superconducting nanowire single photon detector is effectively reduced, and the rate of the superconducting nanowire single photon detector is further improved; and the superconducting nanowire is directly formed on the surface of the micro-nano fiber, and the long-term working stability of the superconducting nanowire single photon detector is improved.

The invention discloses a phase noise compensative amplification system, and the phase noise compensative amplification system comprises an oscillator (1) for outputting a seed light source, and the phase noise compensative amplification system is characterized in that the output end of the oscillator (1) is provided with an acoustic-optic frequency shifter (2) for outputting zero-order light (LO) and first-order light (L1) after processing the seed light source, wherein the output end of the first-order light (L1) of the acoustic-optic frequency shifter (2) is provided with a stretcher (3), the output end of the stretcher (3) is provided with a cascade amplifier (4), the output end of the cascade amplifier (4) is provided with a compressor (5), the output end of the compressor (5) is provided with a number one beam splitting sheet (BS1), the reflection light of the number one beam splitting sheet (BS1) is communicated with a compensative amplification system (12), and the compensative amplification system (12) is connected with the acoustic-optic frequency shifter (2) and supplies a control signal to the acoustic-optic frequency shifter (2).

The invention relates to the technical field of display, in particular to a backlight module and a display device. The backlight module comprises a light guiding plate and a light emitting assembly capable of emitting light rays and making the emitted light rays enter into the light guiding plate in a parallel mode; the light guiding plate further includes a light inlet surface, a bottom surface, a light outlet surface on the top and at least one oblique reflection surface, wherein the oblique reflection surface is positioned between the bottom surface and the light outlet surface, and the included angle between the oblique reflection surface and the plane, in the extension direction away from the light inlet surface, of the bottom surface is smaller then 90 degrees; the light inlet surface is positioned on one side of the light guiding plate. By the light emitting assembly, parallel light is emitted to the light inlet surface and reflected out of the light guiding plate by the oblique reflection surface, namely the light guiding plate does not need to be added with optical films, the condition that light is absorbed by the optical films is avoided, and the brightness of the parallel light emitted by the light guiding plate is not damaged; moreover, by not adding peep-proof protection films and other materials, the backlight assembly is much thinner.

The present invention discloses an optical module comprising a circuit board, a first lens assembly and a laser chip. The first lens assembly is arranged above the laser chip; the first lens assembly includes a first optical fiber jack, a first reflective surface and a second reflective surface; the first optical fiber jack is for inserting the first optical fiber and the projection of the central axis of the first optical fiber jack on the circuit board does not pass through the center of the effective light emitting surface of the laser chip; the first reflecting surface is for receiving the first incident light signal from the laser chip so that the first incident light signal is reflected on the first reflecting surface to obtain a first reflected light signal; and the second reflecting surface is for receiving the first reflected light signal such that the first reflected light signal is reflected on the second reflecting surface to obtain a second reflected light signal and the second reflected light signal is transmitted through the second lens assembly and received by the first optical fiber. The optical module can realize independent lens assembly package of transmission and reception ends, thereby improving the optical coupling efficiency of the transmission end and the reception end of the optical module.

The invention relates to a waveguide coupling element with forward and backward coupling properties and a manufacturing method thereof. The waveguide coupling element with the forward and backward coupling properties comprises a base layer, at least one backward-coupling layer, a medium layer and at least one forward-coupling layer, wherein one end of the forward-coupling layer can be connected with an external optical fiber to couple light waves transmitted by the optical fiber; and the light waves can be efficiently coupled into the backward-coupling layer in a coupling order from the forward-coupling layer to the medium layer to the forward-coupling layer, and are limited to be transmitted in the backward-coupling layer. Furthermore, with the adoption of the manufacturing method, the waveguide coupling element with the forward and backward coupling properties can be manufactured in a large scale with low cost by using the conventional semiconductor process.

The invention provides a three-dimensional fixing method of a micro-naked coupling lens, comprising the steps: attaching an LD (laser diode) chip on a top supporting surface on a step seat, wherein the front side of the step seat is provided with a bottom supporting surface which is lower than and parallel to the top supporting surface; utilizing a suction pipe type clamp to hang the micro-naked coupling lens above the bottom supporting surface and adjusting the position of the micro-naked coupling lens by the suction pipe type clamp so as to lead the coupling of the micro-naked coupling lens and the LD chip to be in place; utilizing a CCD (charged coupled device) camera to measure the height of a gap between the bottom surface and the bottom supporting surface of the micro-naked coupling lens; utilizing the suction pipe type clamp to move the micro-naked coupling lens upwards, then selecting and putting a gasket on the bottom supporting surface, and moving the micro-naked coupling lens downwards to lead the micro-naked coupling lens to be located on the gasket, wherein the thickness of the gasket is consistent to the height of the measured gap; and utilizing the conventional sticking mode to fix the micro-naked coupling lens and the gasket. The three-dimensional fixing method has the advantages that the operation is simple and convenient, the control is easy, the error is less, the optical coupling efficiency is high, the time and the labor are saved, and simultaneously the repairability is achieved.

This endoscope light source device (100) comprises: a laser light source unit (110) that emits a laser beam; an LED light source unit (130) that emits an LED beam; and an optical path merging member (160) that merges the optical path of the laser beam and the optical path of the LED beam. The etendue of the laser light source unit (110) is smaller than the etendue of the LED light source unit (130). The optical path merging member (160) has a reflection surface (162) that reflects the LED beam, and has, in a region of the reflection surface (162), an opening (164) that lets the laser beam pass through. The optical path merging member (160) reflects the LED beam such that the central axis of the optical path of the LED beam reflected by the reflection surface (162) matches the central axis of the optical path of the laser beam that has passed through the opening (164).

The invention discloses an infrared imaging detecting system through optical fiber coupling between a QWIP-LED and an EMCCD. According to the system, an optical fiber image transmission bundle is used for coupling near-infrared images obtained by QWIP-LED infrared up converting to the EMCCD for imaging, and EMCCD detecting of a long-wave infrared target is achieved. The system has the advantages that the transmission efficiency of infrared images from the QWIP-LED to the EMCCD can be effectively improved through the optical fiber image transmission bundle, accordingly the detecting efficiency of the system is high, and in addition, the space size of the detecting system can be obviously reduced.

The present invention is one optical printing head and its usage. The optical printing head has matrix form condensing micro lens combination set between its LED plate and the matrix form self-focusing micro lens combination to converge the light from the LED plate to the matrix form self-focusing micro lens combination to raise the light strength to the matrix form self-focusing micro lens combination and raise the photocoupling efficiency.

The invention discloses a spot size converter based on a long-period grating. The spot size converter is applied to the field of optical communication and optical waveguide devices, realizes the conversion of the spot size of an optical wave mode, and comprises a substrate, a buffer layer, a high-refractive-index waveguide core, the long-period grating and a low-refractive-index upper cladding strip waveguide, wherein one surface of the buffer layer is fixedly connected with the substrate, and the other opposite surface of the buffer layer is fixedly connected with one surface of the high-refractive-index waveguide core; the other opposite surface of the high-refractive-index waveguide core is used for etching to obtain the long-period grating; and the other opposite surface of the high-refractive-index waveguide core and the long-period grating are fixedly connected with the low-refractive-index upper cladding strip waveguide. According to the invention, the problems of complex structure, high manufacturing difficulty, high technical cost and poor long-term stability of a traditional nanometer photonic waveguide end face coupling spot size converter are solved.

The present invention is suitable for the laser technology field, and provides a beam combiner. The beam combiner comprises a dual fiber collimator, a single fiber collimator and an optical filter. The dual fiber collimator comprises input fibers configured to transmit pump light, active fibers configured to perform light amplification and a first lens in non-interface welding with the end portions of the input fibers and the active fibers, wherein the welding end of the first lens is a plane, one end opposite to the welding end is a curve, the optical filter is arranged on the output light path of the curve, the pump light is reflected to the active fibers and transmits signal light, the single fiber collimator comprises output fibers and a second lens in non-interface welding with the end portion of the output fibers, and the non-welding end of the first lens is opposite to the non-welding end of the second lens. Because there is no interface between each fiber and each lens, there is no attenuation when the pump light and the signal light are transmitted between the fibers and the lens, and the optical coupling efficiency is high; the power bearing capacity is high, and the high-power transmission is realized; a fiber fusion-elongation technology is not employed, the fiber performance itself can be maintained, the pump conversion efficiency is high, and the product performance is stable.

The embodiment of the invention provides a waveguide coupling structure and a light emitter system. The waveguide coupling structure comprises a waveguide core structure and a first cladding, and thefirst longitudinal sectional area of the rectangular surface of the coupling structure of the waveguide core structure changes from small to large in the length direction of the coupling structure; the cross section of the coupling structure is a quadrangle of which the first opposite sides are parallel and the second opposite sides in curve change are symmetrical along the perpendicular bisectorof the cross section; one end surface of the conduction structure is coplanar with the connection surface of the coupling structure, the waveguide core structure is embedded in the first cladding, thesmall end surface of the coupling structure is coplanar with one end surface of the first cladding, and the other end surface of the conduction structure is coplanar with the other end surface of thefirst cladding. Therefore, by applying the technical scheme provided by the embodiment of the invention, the optical coupling efficiency can be improved on the basis of ensuring the miniaturization and integration of the structure.