30results about How to "Enables continuous tuning" patented technology

The invention discloses an optoelectronic oscillator with tunable broadband frequency, which is characterized in that a photon microwave filter is composed of an optical modulator, a high-fineness Fabry-Perot etalon and two fiber couplers and is applied to the optoelectronic oscillator. By tuning wavelength of laser light sources, the filtering peak of the photon microwave filter can be tuned; meanwhile, a microwave phase shifter is used cooperatively, thus continuous large-scale tuning of the optoelectronic oscillator can be realized finally.

The invention discloses an external cavity type single-wavelength tunable laser using an FP (Fabry-Perot) laser as a grain light source. The external cavity type single-wavelength tunable laser comprises an FP laser chip; light waveguide is arranged in the FP laser chip; a partial transmission and reflection lens is arranged on the end face of a port for deriving an excitation light source in an optical waveguide port, and a high-reflection membrane is arranged on the end face of the other port; and an optical lens, an optical etalon for carrying out transmission filtering on a transmission light beam of the excitation light source, and a partial reflector for carrying out partial reflection and partial transmission on light beams transmitting the optical etalon are arranged at one side of the port for deriving the excitation light source in the optical waveguide port in sequence. One wavelength peak of the excitation light source is overlapped to one wavelength position of a transmission peak of the optical etalon by changing the distribution of a comb-shaped wavelength wave of the excitation light source, or changing the distribution of the comb-shaped wavelength peak of the excitation light source and the transmission peak of the optical etalon, so that maximum feedback is obtained by a wavelength of a photon at an overlapped position. With the adoption of the external cavity type single-wavelength tunable laser provided by the invention, single-wavelength laser can be output, and a wavelength of output laser can be continuously or selectively changed.

The invention provides a continuously adjustable degradable terahertz meta-material based on optical driving and preparation method thereof. The degradable terahertz meta-material comprises a sodium alginate substrate, a metal layer and a semiconductor film which are arranged on the sodium alginate substrate; the patterns of the metal layer and the semiconductor film are completely same: three equally spaced openings are formed on the outer ring, two equally spaced openings are formed on the middle ring, and one opening is formed on the inner ring; one of the three openings on the outer ring is aligned with one opening on the middle ring, and the other opening on the middle ring is aligned with the opening on the inner ring. Since the concentrations of carriers produced by the semiconductor film under different optical power excitations are different, the continuous tuning on the electromagnetically responded resonance strength from different conductivities is realized. The meta-material provided by the invention is simple in structure and processing technique, has degradable property and can be used for biomolecule detection, so that the incident electromagnetic wave of the terahertz meta-material has a plurality of frequency bands with continuously tuned strength in the terahertz waveband transmission.

The invention discloses a micro-mechanical cantilever beam type pi type continuous reconfigurable microwave band-pass filter. The micro-mechanical cantilever beam type pi type continuous reconfigurable microwave band-pass filter comprises a planar spiral inductor, two identical MEMS variable planar plate capacitors and two identical MIM capacitors are symmetrically arranged at the left and right sides of the planar spiral inductor in sequence, wherein each MEMS variable planar plate capacitor is connected between a CPW signal wire and a ground wire in parallel while each MIM capacitor is connected with the CPW signal wire in series so as to make up a pi type topological structure with band-pass characteristics. The MEMS variable planar plate capacitors achieve different capacitances based on an electrostatic principle; the upper pole plate of each MEMS variable planar plate capacitor is an MEMS cantilever beam while the lower pole plate thereof is the CPW signal wire, wherein the MEMS cantilever beam stretches across the CPW signal wire, and a drive electrode is arranged near the CPW signal wire; an Si3N4 insulating medium layer covers each of the CPW signal wire under the MEMS cantilever beam and the drive electrode. The filter realizes the continuous tuning for the center frequency and the band width and has advantages of low loss, good out-of-band rejection, wide frequency band tuning and small chip area.

The invention relates to a method and system for achieving the resonant frequency tuning of a miniature cantilever beam through a photothermal effect, and an application. The method comprises the following steps: (1), illuminating the surface of the miniature cantilever beam by modulating the laser to excite the vibration of the miniature cantilever beam; (2), illuminating the surface of the miniature cantilever beam by continuous laser irradiation, generating a thermal effect on the surface of the miniature cantilever beam, and tuning the resonant frequency by controlling the power of the continuous laser; (3), collecting and processing a vibration signal of the miniature cantilever beam. The method can realize the continuous tuning of the resonant frequency of the miniature cantilever beam. Compared with a mode of increasing the frequency bandwidth, the method expands the application bandwidth of the miniature cantilever beam, and the higher the resonance order of the miniature cantilever beam is, the larger the frequency tuning range thereof is. The system can be used as a detector for detecting vibration frequencies. Since the miniature cantilever beam can convert the energy ofa physical quantity into the kinetic energy of the beam by interacting with the external physical quantity with a certain frequency, the detection of the physical quantity frequency is realized according to the vibration frequency of the beam.

The invention discloses a work U-waveband high-power picosecond pulse laser generating method. According to the method, a model locking picosecond pulse seed laser on the communication waveband is amplified through an erbium-doped optical fiber amplifier (EDFA) to obtain a high-power picosecond pulse laser, the output picosecond pulse laser is coupled to a regular multimode fiber or a double-clad fiber, and then picosecond pulse laser output is obtained through intra-resonant cavity feedback; the U-waveband Raman laser with a picosecond-magnitude pulse width is obtained by means of stimulated Raman frequency shift. There is no report currently about high-power picosecond or even shorter ultrafast pulses for lasers working on the wavelength. The high-power picosecond pulse laser output with the method is needed greatly in the aspects such as high-speed optical communication, Doppler anemometry laser radar, differential absorption laser radar and intermediate infrared lasers.

The invention discloses scatter communication high frequency equipment for full-band operations. The scatter communication high frequency equipment comprises a frequency converter, a power amplifier, a limiting low noise amplifier, a first circulator, a second circulator, a coupler and a loader, a transmitting channel frequency conversion filter, a receiving channel frequency conversion filter, a transmitting channel duplexing filter, a receiving channel duplexing filter and a monitoring unit. An intermediate frequency input signal is firstly up-converted to a radio frequency signal through the frequency converter, the radio frequency signal is subjected to frequency selection through the transmitting channel frequency conversion filter and then is sent to the power amplifier, the power amplifier carries out power amplification for the radio frequency signal that is subjected to frequency selection, and a high-power signal output by the power amplifier is fed to an antenna through the transmitting channel duplexing filter and then is emitted through the antenna; and a radio frequency small signal received from the antenna is firstly subjected to frequency selection through the receiving channel duplexing filter, then enters the limiting low noise amplifier to perform low-noise limiting amplification, is filtered by the receiving channel frequency conversion filter, then enters a down-conversion area of the frequency converter to be converted to an intermediate frequency signal, and then is transmitted to a low-frequency unit after being amplified to an appropriate level.

The invention provides a laser for realizing 2-micron waveband tuning narrow linewidth laser output. The laser comprises a laser pumping source, a coupled focusing system, an input mirror, a laser crystal and an output mirror, wherein a wavelength modulation prism is arranged between the laser crystal and the output mirror; the laser crystal is an Ho: SSO crystal. According to the laser provided by the invention, the problem that the conventional 2-micron waveband lasers are narrow in tuning range is solved; Ho: SSO is adopted as the laser crystal; the wavelength modulation prism is adopted to realize the continuous tuning of laser wavelength; a volume grating is adopted as the output mirror; a Tm: YAP laser is adopted as the pumping source; a resonant cavity is an L-shaped plane concave cavity. The laser has the advantages of realizing high-power narrow-tuning continuous laser output of 2-micron waveband and satisfying the requirements for high-energy wide-spectrum laser light sources in spectral measurement.

The invention relates to a non-contact variable capacitor-loaded frequency-tunable microstrip patch antenna. The microstrip patch antenna comprises a bottom substrate, a microstrip patch resonator anda microstrip feeder line, wherein the microstrip patch resonator and the microstrip feeder line are arranged on the upper surface and the lower surface of the bottom substrate respectively; the microstrip patch resonator comprises a metal reflection floor, a middle substrate, a top substrate and microstrip patches which are sequentially stacked from bottom to top; a pair of microstrip lines for frequency tuning is arranged between the middle substrate and the top substrate; the microstrip lines for frequency tuning are overlapped with the microstrip patches in a non-contact mode across the top substrate; and the outer ends of the microstrip lines for frequency tuning are electrically connected with the inner ends of variable capacitors loaded on the upper surface of the top substrate, andthe outer ends of the variable capacitors are grounded. The microstrip lines for frequency tuning and the corresponding variable capacitors form a non-contact frequency tuning structure which is usedfor continuously tuning the frequency of the antenna. The invention provides a novel non-contact variable capacitor loading scheme for the first time to design the frequency-reconfigurable microstrippatch antenna working under the main mode TM10.

The invention relates to a frequency tunable microstrip patch resonator loaded by a non-contact variable capacitor non-contact variable capacitor. The resonator comprises a metal ground, a bottom substrate, a top substrate and a microstrip patch which are sequentially stacked from bottom to top, and a pair of symmetrical microstrip lines for frequency tuning arranged along the central line of themicrostrip patch is arranged between the bottom substrate and the top substrate. The microstrip lines for frequency tuning are overlapped with the microstrip patch in a non-contact manner across the top substrate, the outer end of the microstrip line for frequency tuning is electrically connected with the first end of a variable capacitor loaded on the upper surface of the top substrate, and the second end of the variable capacitor is electrically connected with the metal ground. The microstrip line for frequency tuning and the variable capacitor form a non-contact frequency tuning structure,and the non-contact frequency tuning structure is used for continuously tuning the frequency of the resonator. The invention provides a novel non-contact variable capacitor loading scheme for the first time to design a frequency-reconfigurable microstrip patch resonator working under a main mode TM10.

The invention provides a tunable active filter which comprises a light polarization input control unit, a magnetic filter body and a magnetic field loading unit, wherein the light polarization input control unit is used for converting input light into TM-mode polarized light which incomes in the K direction, the magnetic filter body is arranged at the rear end of an optical path of the light polarization input control unit and prepared through magnetic materials and dielectric substances, the magnetic filter body is of a periodic Bragg structure which has defects, extends in the K direction and is used for filtering the polarized light which incomes from the light polarized input control unit by means of a transmission peak generated by the defects of the periodic Bragg structure, and the magnetic loading unit is used for generating a magnetic field which is perpendicular to the K direction and the incident polarized light electric field direction and modulating the position of the transmission peak generated by the defects of the Bragg structure. The tunable active filter is easy to manufacture, quick in response, flexible in tuning process and high in tuning precision.

The invention relates to a frequency tunable microstrip patch resonator based on a half-cut technology. The frequency tunable microstrip patch resonator comprises a metal ground, a bottom layer substrate, a top layer substrate and a microstrip patch which are sequentially stacked from bottom to top, and a microstrip line for frequency tuning is arranged between the bottom layer substrate and the top layer substrate. The microstrip line for frequency tuning is overlapped with the microstrip patch in a non-contact manner across the top substrate, the outer end of the microstrip line for frequency tuning is electrically connected with the inner end of the variable capacitor loaded on the upper surface of the top substrate, and the outer end of the variable capacitor is electrically connectedwith the metal ground; one side, far away from the variable capacitor, of the microstrip patch is grounded, and the microstrip line for frequency tuning and the variable capacitor form a non-contact frequency tuning structure used for continuously tuning the frequency of the resonator. The invention provides a novel non-contact variable capacitor loading scheme for the first time to design the frequency-reconfigurable microstrip patch resonator working under a main mode TM10.