74results about How to "Wide working wavelength range" patented technology

Techniques of designing a smart antenna system are described. An antenna system includes at least two integrated antenna units arranged with a predefined angular angle therebetween to form a desired antenna pattern without any significant nulls. According to one aspect of the techniques, at least two sets of antenna units are interlaced but polarized differently to form an integrated antenna unit. Each of the antenna units is formed with an array of antennas. The antennas in an array or the antenna units in an integrated antenna unit can be selectively energized to form a desired antenna pattern in accordance with a signal determined from radio frequency signals communicated between a device equipped with the antenna system and another device (e.g., a Wi-Fi router in communication with a mobile device), where the desired antenna pattern provides an optimized antenna pattern to facilitate seamless or QoS communication between the two devices.

Techniques of designing a smart antenna system are described. An antenna system includes at least two integrated antenna units arranged with a predefined angular angle therebetween to form a desired antenna pattern without any significant nulls. According to one aspect of the techniques, at least two sets of antenna units are interlaced but polarized differently to form an integrated antenna unit. Each of the antenna units is formed with an array of antennas. The antennas in an array or the antenna units in an integrated antenna unit can be selectively energized to form a desired antenna pattern in accordance with a signal determined from radio frequency signals communicated between a device equipped with the antenna system and another device (e.g., a Wi-Fi router in communication with a mobile device), where the desired antenna pattern provides an optimized antenna pattern to facilitate seamless or QoS communication between the two devices.

Techniques for designing optical devices with high reflection isolation are disclosed. According to one aspect of the devices, an optical filter and a reflecting element are used. Depending on implementation, the reflecting element may be another optical filter, a prism and a mirror. The reflecting element is provided to direct a reflected light beam from the optical filter back to the optical filter for additional filtering, wherein the reflected light is a filtered signal that is presumably carrying residuals of unwanted signals (e.g., a transmitted signal of the optical filter). With a proper placement of the reflecting element with respect to the optical filter, the reflected light beam can be redirected back to the optical filter for a predefined number of times so that the errors or residuals in the reflected light beam are much reduced, if not completely removed.

The invention relates to optical communication field and provides an electro-optic mode converter with a Mach-Zehnder interferometer structure and an implementing method thereof. The electro-optic mode converter comprises the Mach-Zehnder interferometer structure and an electro-optic phase modulating electrode, is mainly based on an electro-optic effect and an interference principle, and changes a phase relation of light waves on two interference arms by controlling voltage applied to the electro-optic phase modulating electrode, thereby achieving conversion between two modes. The electro-optic mode converter is fast in mode conversion speed, wide in operating bandwidth, and has practical application value.

The invention belongs to the technical field of light beam conversion, in particular to a method for generating a bezier-like light beam through an optical fiber end face growth microcone. The methodcomprises the following steps of: depositing a photopolymer liquid reagent on the end face of a single-mode optical fiber, coupling green laser into the single-mode optical fiber through a lens, and reacting with the photopolymer liquid reagent deposited on the end face of the single-mode optical fiber to form a polymer microcone; wherein the light beam is converted into a bezier-like light beam after passing through the polymer microcone formed by the end face of the optical fiber. The shape of the microcone is controlled by light polymerization parameters such as green laser power, laser exposure time and oxygen diffusion concentration. The working bandwidth of the microcone covers the whole visible light region and even the near infrared band, and can have more than 30 concentric ringsat most, and the generated Bezier-like beam has self-recovery property. The method has the advantages of high efficiency, low cost and convenience, and can be widely applied to the fields of particlecontrol, optical imaging, nonlinear optics, photoetching, micro-manufacturing and the like.

A method and a device for realizing a low-cost tunable semiconductor laser based on a reconstruction-equivalent chirp technology belong to the technical field of optoelectronics, and relate to the design and manufacture of a complex distributed feedback tunable semiconductor laser. The invention aims to provide a low-cost tunable distributed feedback semiconductor laser for the future WDM-PON market by adopting the reconstruction-equivalent chirp technology for low-cost manufacture. The basic technology is that a plurality of distributed feedback semiconductor lasers of different wavelengths are integrated on the same chip through a series / parallel hybrid mode, and a mode of crosstalk isolation between adjacent laser chips is provided. According to the invention, DFB lasers of different working wavelengths based on the reconstruction-equivalent chirp technology are integrated by a series / parallel combination mode, one of the lasers is selected by current to work, and the working wavelength of the laser can be controlled by adjusting the temperature or current, thus realizing continuous tuning of the working wavelength of the laser.

The invention discloses an optically annular lighting device, and relates to a lighting device. The optically annular lighting device is provided with a mechanical adjusting frame, a first fixing frame, an inner conical surface reflecting mirror, a conical surface reflecting mirror and a second fixing frame, wherein the mechanical adjusting frame is internally provided with a screw thread, the first fixing frame and the second fixing frame are embedded into the mechanical adjusting frame, the inner conical surface reflecting mirror is fixed on the first fixing frame, and the conical surface reflecting mirror is fixed on the second fixing frame. According to the invention, the energy of an emergent annular light beam basically has no loss compared with that of an incident light ray; the optically annular lighting device basically has no phenomena such as chromatic dispersion, spherical aberration and has a wide range of working wavelengths; the structure of the conical surface reflecting mirror is simple and is easy to process; and the optically annular lighting device can be matched with any objective lens with different backlight aperture sizes, can continuously adjust the angle of an incident excited light and the line diameter size of the emergent annular light beam, and is suitable for the fields of fluorescent light and Raman experiment researches such as high angle SPR (surface Plasmon resonance) excitation, ATR (attenuated total reflectance), super-resolution optical microscopes and the occasions such as advertisement demonstration, stage demonstration.

The invention discloses a polarization controller based on graphene, and relates to the technical field of photoelectronics. The polarization controller is based on a traditional silicon (SOI) structure on an insulator substrate and comprises a waveguide with the graphene, a vertically embedded graphene layer is arranged on one segment in the waveguide, a horizontally embedded graphene layer is arranged on the other segment of the waveguide, and graphene in the two waveguide segments is connected through two independent electrodes. Absorption of the two waveguide segments on a TM mode (transverse magnetic mode) and a TE mode (transverse electric mode) is regulated and controlled through driving voltage applied to the graphene layers, and therefore selective output on the TE mode and the TM mode is achieved. The polarization controller has the advantages of being small in size, high in extinction ratio, small in inserting loss, high in response speed, wide in work wavelength range and capable of being integrated, and has the important application prospect in optoelectronic integration in the future.

A method and a device for obtaining flattop Brillouin gain spectra based on pumping modulation in liquid core optical fibers solve the problem in the existing method and device that flattop gain spectra cannot be obtained when adopted dispersion displacement optical fibers or standard single mode optical fibers are over long and equal amplitude pumping wires are fewer and intrinsic Brillouin gain spectra cannot be changed. The method comprises modulating lasers output by a laser to obtain multiple spectral line pumping light, inputting the multiple spectral line pumping light in the liquid core optical fibers, and obtaining the flattop Brillouin gain spectra, namely spectra of backward Brillouin scattering light in the liquid core optical fibers. The device is composed of the laser, a polarization controller, a strength modulator, a signal generator, a direct current DC stabilized power supply, an optical fiber circulator, an optical fiber coupler and the liquid core optical fibers, and another device is composed of a signal generator, an optical fiber circulator, an optical fiber coupler, the liquid core optical fibers and a phase modulator. The method and the device are applicable to obtaining of the flattop Brillouin gain spectra.

The invention discloses a photonic crystal T-shaped waveguide-based right-angle output magneto-optical modulator which comprises a photonic crystal T-shaped waveguide with a TE forbidden band. The modulator further comprises an input end (1), two output ends (2, 3), a background silicon dielectric cylinder (4), isosceles right triangle defect dielectric cylinders (5), a defect dielectric cylinder (6), an electromagnet (7) for supplying an offset magnetic field, a modulation power supply (9) and a modulating signal (10), wherein the input end (1) is arranged at the left end of the photonic crystal T-shaped waveguide; the output ends (2, 3) are respectively located at the right end and upper end of the photonic crystal T-shaped waveguide; the defect dielectric cylinder (6) is located at a central interaction of the T-shaped waveguide; four isosceles right triangle defect dielectric cylinders (5) are respectively located at the four corners of the interaction of the T-shaped waveguide; the photonic crystal T-shaped waveguide is used for inputting the TE carrier light through the port (1) and then outputting the amplitude modulating light from the port (3). The invention provides a right-angle output magneto-optical modulator capable of efficiently realizing the photonic crystal T-shaped waveguide.

Techniques for designing optical devices with high isolation are disclosed. The high isolation is achieved by causing a reflected light signal to go through another filter. According to one embodiment, an optical apparatus comprises a first optical filter configured to transmit a first selected wavelength and reflect all other wavelengths, a second optical filter the second optical filter configured to transmit a second selected wavelength and reflect all other wavelengths. The first optical filter, being not perfect and producing a reflected signal with a residual of a signal at the first selected wavelength, the residual of the signal is minimized by the second optical filter when the reflected signal is impinged upon the second optical filter.

The invention discloses a silicon-based polarization beam splitting rotator based on adiabatic cone asymmetric coupling and a Y branch. According to the rotator, silicon dioxide is adopted as a substrate and a coating layer; a buffer layer made of a silicon material is additionally arranged between the substrate and the coating layer, and a ridge waveguide is constructed on the buffer layer, and therefore, a polarization beam splitting rotator main body can be formed. The ridge waveguide is composed of three sections of structures. The first section is of a heat insulation conical structure, the width of the first section gradually changes from W1 to W2, and conversion from a TM0 polarization mode to a TE1 polarization mode is achieved in a waveguide 1; the second section adopts an asymmetric coupling structure and a heat insulation conical structure to realize polarization beam splitting and rotation from a waveguide 1 to a waveguide 2; and the third section consists of a Y branch andis connected with the second section through an S-shaped bent structure to realize second-stage polarization beam splitting and rotation. The silicon-based optical polarization beam splitting rotatorhas the advantages of large working wavelength range, high extinction ratio, low loss and the like, and has important application in systems of optical communication, photoelectric signal processingand the like.

The present invention discloses an imaging spectrometer on the basis of an etched diffraction grating. The imaging spectrometer comprises an imaging system and an integrated chip mainly integrating a first splitting system or a second splitting system. After an input light is imaged to a space light through the imaging system, the space light is subjected to light splitting output through the first splitting system, or the space light is subjected to light splitting output through the second splitting system after the space light is processed or focused through a digital micromirror array light switch and a cylindrical mirror. According to the invention, the weight and the volume of the imaging spectrometer are greatly mitigated, the integrated level is high and the stability of the system is enhanced; and moreover, the imaging spectrometer on the basis of etched diffraction grating has a wide-range spectrum and good system function expansibility and is applicable to the remote sensing detection of a small unmanned aerial vehicle.

The invention provides a few-mode fiber device. The fiber core of the few-mode fiber device is formed by a main fiber core and auxiliary fiber cores, wherein the normalized frequency Vm of the main fiber core is larger than 2.405, and the number of the auxiliary fiber cores is M which is larger than or equal to 1. One end of each of the auxiliary fiber cores intersects with the side face of the main fiber core, and the central axis of the main fiber core and the central axes of the auxiliary fiber cores are on the same plane. The other end of each of the auxiliary fiber cores is on an optical fiber end face, and in the end face, the central distance between any two fiber cores is larger than the sum of the radii of the two fiber cores. The parameter between any auxiliary fiber core and the main fiber core satisfies a condition that the refractive index of at least one transmission mode of the main fiber core is lower than the effective refractive indexes of the auxiliary fiber cores. The invention provides the novel few-mode fiber device, and the conversion, combination, separation or elimination of the modes in a few-mode fiber can be realized.

A passively Q-switched fiber laser system comprises a pump source and an ring cavity connected with each other. The ring cavity comprises a gain fiber, a directional coupler and a saturable absorber connected in order. The saturable absorber is a quantum-dot polymer composite film, which is fabricated by a simple method comprising steps of: mixing a quantum dot material of lead sulfide (PbS) with a colloidal polymer to form a mixture; and drying the mixture at two different temperatures in two stages respectively. The saturable absorber of the present invention has lower saturating intensity and a plurality of absorption bands comprising 1000 nm to 1100 nm and 1500 nm to 1600 nm. The maximum output power and the maximum pulse energy of the passively Q-switched fiber laser system can be superior to those laser systems using the quantum-dot (QD) polymer composite film as saturable absorber.

The invention discloses an electro-optical polymer waveguide mode conversion switch for a mode multiplexing technology, and is applied to the field of optical communication. Aiming at the problems ofinsufficient stability, structure complexity, relatively slow conversion speed, insufficient working wavelength range and the like of an existing reconfigurable mode converter, a mode switch of voltage control and electric tuning is achieved by electro-optical effects of a long-period grating structure and an electro-optical polymer, and a novel electro-optical mode converter is constructed; and the device has the advantages of rapid conversion speed, low half-wave voltage, low cost and the like and has good actual application value.

The invention discloses an integrated device for realizing light polarization beam splitting and rotation. The integrated device comprises a first straight waveguide and a second straight waveguide which are arranged in parallel. An upper cladding layer is arranged above the first straight waveguide and the second straight waveguide, and a lower cladding layer is arranged under the first straight waveguide and the second straight waveguide so as to form a coupling region. The refractive index of the upper cladding layer and the refractive index of the lower cladding layer are less than the refractive index of the first straight waveguide and the refractive index of the second straight waveguide, and the refractive index of the upper cladding layer is greater than or less than the refractive index of the lower cladding layer. Compared with the prior art, waveguides which are asymmetric in the vertical direction are formed according to the structure of the invention, and the coupling region structure can be used to support strong cross coupling effect. Through the cross coupling effect with the waveguides which are asymmetric in the vertical direction, through the two waveguide which are coupled in parallel, and the polarization beam splitting and polarization rotation effects can be realized through the directional coupling method.

The invention relates to the technical field of optics, in particular to a polarization beam splitter and a forming method thereof. The polarization beam splitter includes a substrate, and a first waveguide, a slit waveguide and a second waveguide which are located on the surface of the substrate and extend in a first direction. The first waveguide, the slit waveguide and the second waveguide arearranged in parallel in a second direction perpendicular to the first direction, and the slit waveguide is located between the first waveguide and the second waveguide. The first direction is the propagation direction of light, and the first direction and the second direction are both parallel to the substrate. Transverse magnetic polarized light in the light can be coupled to the second waveguidefrom the first waveguide through the slit waveguide. According to the invention, separation of a TM polarization mode and a TE polarization mode in light is realized, and the polarization beam splitter has a plurality of potential applications in the aspects of polarization multiplexing, sensing and the like in the future.

The invention discloses a miniature spectrum testing system. The system comprises a light beam collimation module and a photoelectric detection module; light to be tested is collimated by the light beam collimation module, and then the collimated light to be tested is projected to the photoelectric detection module; the photoelectric detection module comprises a rotatable semiconductor substrate layer and a metal or metal-like material film covering the semiconductor substrate layer; and the light facing surface of the photoelectric detection module is prepared into a grating. The invention further discloses a spectrum testing method. The method comprises the following steps that: a light beam of a to-be-tested spectrum is collimated; the photoelectric detection module is rotated, and electric signals corresponding to each rotating angle are recorded and analyzed, and the light intensity information of each wavelength light in the to-be-tested spectrum is realized according to the light intensity information corresponding to the wavelengths in the spectrum. The method has the advantages of high-spectral resolution, large-working wavelength range and high-integration level spectral testing capability.

New designs of optical devices, particularly for adding or dropping a selected wavelength or a group of wavelengths as well as multiplexing a plurality of signals into a multiplexed signal or demultiplexing a multiplexed signal into several signals are disclosed. According to one aspect of the present invention, a reflected light beam from an optical filter is caused to go through the same optical filter at least one more time to minimize a residual signal embedded in the reflected light beam, wherein the residential signal is caused by the imperfect spectral characteristics of the optical filter. According to another aspect of the present invention, a reflective element is so positioned that the reflected light beam is bounced back to the optical filter. When the reflective element is another optical filter being substantially similar to that optical filter, the reflected light beam is equivalent to having transmitted. As a result, the residual signal in the reflected light beam is substantially minimized, resulting in great isolation for the R-channel from the T-channel.

The invention discloses a photonic crystal T-shaped waveguide-based horizontal output magneto-optical modulator which comprises a photonic crystal T-shaped waveguide with a TE forbidden band. The modulator further comprises an input end (1), two output ends (2, 3), a background silicon dielectric cylinder (4), isosceles right triangle defect dielectric cylinders (5), a defect dielectric cylinder (6), an electromagnet (7) for supplying offset magnetic field, a modulation power supply (9) and a modulating signal (10), wherein the input end (1) is arranged at the left end of the photonic crystal T-shaped waveguide; the output ends (2, 3) are respectively located at the right end and upper end of the photonic crystal T-shaped waveguide and are arranged in a horizontal line; the defect dielectric cylinder (6) is located at a central interaction of the T-shaped waveguide; four isosceles right triangle defect dielectric cylinders (5) are respectively located at the four corners of the interaction of the T-shaped waveguide; the photonic crystal T-shaped waveguide is used for inputting the TE carrier light through the port (1) and then outputting the amplitude modulating light from the port (2). According to the invention, the TE carrier optical wave signal modulator can be efficiently realized.

The invention discloses a right-angle output double-way inverted optical clock signal generator with a photonic crystal T-type waveguide. The optical clock signal generator comprises the photonic crystal T-type waveguide with a TE forbidden band and further comprises one input end (1), two output ends (2 and 3), background silicon dielectric cylinders (4), isosceles right triangle defect dielectric cylinders (5), a defect dielectric cylinder (6), an electromagnet (7) providing a bias magnetic field and a rectangular wave current source (9). The left end of the photonic crystal T-type waveguide is the input end (1), the output ends (2 and 3) are located at the right end and the upper end of the photonic crystal T-type waveguide respectively, the defect dielectric cylinder (6) is located in the center intersection position of the T-type waveguide, and the four isosceles right triangle defect dielectric cylinders (5) are located at the four intersecting corners of the T-type waveguide respectively; TE carrier wave light is input through the port (1) of the photonic crystal T-type waveguide, and two ways of optical clock signals opposite in phase are output from the ports (2 and 3). The TE light double-way inverted optical clock signal generator can be obtained efficiently.

The invention discloses a compact detection system for realizing handheld terahertz reflection spectrum detection. The detection system comprises a terahertz detection head optical subsystem which consists of a collimating lens group, a beam shrinking lens group, a THz turning light path, a THz window and a 3D printed detection head structure; a terahertz source subsystem which is composed of a femtosecond laser, an optical fiber and coupler and a THz emitter; and a terahertz detector subsystem which is composed of a femtosecond laser, an optical delay line, an optical fiber and coupler, a THzreceiver, an amplifier and a computer. The terahertz detection head optical subsystem inputs divergent terahertz waves emitted by a terahertz source on the surface of a detection substance in a uniform and collimated mode and enables reflected terahertz waves to be focused on the receiving surface of the terahertz detector; the terahertz waves emitted by the terahertz source are firstly collimated into uniform parallel light through the collimating lens group, then the uniform parallel light is emitted from the terahertz window through the turning light path to irradiate the surface of the detection substance, and finally the reflected terahertz waves are focused to the photosensitive surface of the THz receiver through the beam shrinking lens group through the terahertz window and the turning light path.

The invention provides a graphene-assisted vanadium oxide thermo-optical modulator and a preparation process thereof. The modulator comprises a substrate, wherein a first insulating layer is formed on the surface of the substrate, a graphene layer is disposed on the first insulating layer, and a second insulating layer is formed above the graphene layer. The graphene-assisted vanadium oxide thermo-optical modulator further comprises a metal electrode and a vanadium oxide thin film layer, wherein the metal electrode is arranged on the graphene layer through photoetching or deposition, and the vanadium oxide thin film layer is arranged on the second insulating layer in a magnetron sputtering, reactive ion sputtering or deposition metal reoxidation mode. The advantages are that excellent characteristics of graphene and vanadium oxide are fully utilized, and characteristics of small size, low insertion loss, high extinction ratio and wide operating wavelength range are realized.

The invention provides a mirror with variable reflectivity. The mirror with variable reflectivity is a multilayer membrane structure optical element which is prepared on a substrate by adopting a physical vapor deposition membrane coating technology under certain conditions based on the light interference principle with a conductive membrane, VO2 and SiO2 acting as main membrane layer material. Adjustment of infrared light reflectivity can be realized via temperature adjustment within range of room temperature to 80 DEG C. The reflecting mirror is high in anti-interference performance and great in stability.

Techniques of designing an antenna array with antenna units controlled electronically are described. Through controlling the combination of the reflectors in each of the antenna units, a desired antenna pattern is formed, adapting to the environment, and providing reliable and efficient links between two transceivers. According to one aspect of the present invention, a switch (e.g., a diode) is used to couple two reflectors. The diode is controlled to be on or off so that the reflectors are conductively integrated or separated.

The invention relates to an optical lens assembly for generating a super-chirality light field and belongs to the application optics field. The assembly includes a cone beam reflector, a beam collimation block, an optical glass plate and a beam gathering block, wherein the incident light is a helically radially polarized beam. The proposed optical lens structure can regulate the propagation direction of the incident light, helical radially polarized beams are concentrated onto a central axis in a direction perpendicular to the central axis, and the super-chirality light field is achieved on the central axis.

Techniques of designing an antenna array with antenna units controlled electronically are described. Each of the antenna units includes a reflector, a driven element and one or more directors. A substrate with conductive material on its surface provided to support the antenna array is designed to be the reflector. The driven element is separated into two halves with each on one side of a non-metal substrate vertically bonded to the conductive substrate. Two driving lines provided to drive the two halves of the driven element are disposed on both sides of the non-metal substrate to minimize possible interactions with other elements of the antenna unit or the antenna array.

The invention relates to an optical fiber probe. The invention relates to a probe, in particular to a double-side-coated hollow double-core PCF-SPR probe which works in a solution environment and hashigh sensitivity. The double-side coated hollow double-core PCF-SPR probe is a photonic crystal fiber, a central air hole is formed in a cladding of the photonic crystal fiber, an inner gold film is coated on the inner wall of the central air hole, an outer gold film is coated on the outer wall of the cladding, and two fiber cores are positioned between the inner gold film and the outer gold filmand are symmetrically distributed to form the double-core symmetrical photonic crystal fiber. The probe can enable the fiber core guide mode and the plasma films on the two sides to resonate at the same time; the resonance phenomenon is obviously enhanced compared with single-side coating; the average spectral sensitivity of the fluorescent probe is 22571.43 nm / RIU; the average spectral sensitivity is 20 times that of a single-side coating film; the wide working wavelength range is 1000 nm to 3400 nm; the device is simple in structure, reasonable in design, affordable and easy to apply practically.

The invention discloses a spectrum analyzer, which comprises a two-dimensional G-T resonant cavity array and a two-dimensional CCD (charge coupled device) type detector relative to the two-dimensional G-T resonant cavity array. The reflectivities at the front end of the G-T resonant cavity array are gradiently changed, the high reflectivity is fixed at the rear end, and the relative position between the G-T resonant cavity array and the CCD type detector is regulated so that a primary diffraction pattern of the two-dimensional G-T type detector is imaged in the CCD type detector, and finally the wavelength and the intensity of the signal light are read by the CCD type detector, so that the CCD type detector is scanned on two dimensionalities, thereby the measurement range and the resolution ratio of the spectrum analyzer are greatly broadened and the scanning speed is increased; and the preparation size of the spectrum analyzer is greatly reduced, and the preparation cost is effectively reduced, so that the spectrum analyzer is beneficial for volume production.