798 results about "Electro-optic modulator" patented technology

The embodiment of the invention provides an electro-optical modulator and a light quantum computer. The electro-optical modulator comprises an electrode assembly and an optical waveguide assembly. The electrode assembly comprises a positive signal electrode, a negative signal electrode, a first grounding electrode and a second grounding electrode, and the positive signal electrode and the negative signal electrode are arranged between the first grounding electrode and the second grounding electrode. The optical waveguide assembly is configured to bear optical signals and comprises a first optical waveguide and a second optical waveguide, the first optical waveguide is located between the positive signal electrode and the negative signal electrode and used for bearing first optical signals, and the second optical waveguide is located between the first grounding electrode and the positive signal electrode or between the second grounding electrode and the negative signal electrode and used for bearing second optical signals. The carrier is used for bearing second optical signals. Constant-amplitude voltage signals with opposite phases are applied to the positive signal electrode and the negative signal electrode which are tightly coupled, so that the modulation efficiency can be improved, and the common-mode noise can be reduced.

The invention discloses a multi-sideband chirp modulation DAS system and a working method thereof, and relates to the technical field of distributed sound wave sensing. The DAS system comprises a narrow linewidth laser, an optical fiber coupler, a phase modulator, an electro-optical modulator, an erbium-doped optical fiber amplifier, an optical fiber circulator, a dense wavelength division multiplexer, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator, a direct current source and the like. The phase modulator is used for modulating constant-amplitude multi-frequency continuous light, the frequency number of light waves is related to the harmonic number of a microwave modulation signal, the frequency interval is determined by the fundamental frequency of the microwave modulation signal, the continuous light frequency can be flexibly modulated by adjusting the microwave modulation signal, and the modulation bandwidth is large; detected beat frequency signals are compressed into single-frequency signals through pulses, phase information of the single-frequency signals is demodulated, vibration signals along the sensing optical fiber can be detected, the spatial resolution of the system depends on the chirp frequency sweeping range, and the spatial resolution is high.

The invention discloses an optical frequency comb generation method and device based on Brillouin scattering and an electro-optical modulator, and belongs to the field of photoelectric measurement. The method comprises the steps that a first laser and a second laser are used for generating pump light and seed light respectively, multi-wavelength pump light is generated through a cascade electro-optical modulator, the pump light and the seed light are emitted into a Sagnac loop, an optical frequency comb is output through the forward Brillouin scattering effect of an optical fiber and the electro-optical modulator, and the seed light and the pump light are output. The polarization controller is adjusted to optimize polarization state matching of the pump light and the seed light, so that the Brillouin scattering effect reaches the maximum value. The device is composed of a laser, an electro-optical modulator, a signal generator, an optical amplifier, an optical isolator, an optical coupler, a polarization controller and an optical fiber. The optical fiber forward Brillouin scattering effect and the electro-optical modulator are combined, the optical frequency comb giving consideration to the wide frequency spectrum and the narrow interval is generated, meanwhile, the comb tooth interval of the optical frequency comb can be accurately controlled by independently adjusting the frequency of the signal generator, and accurate measurement of signals or objects is achieved.

The invention provides a bent waveguide structure, an electro-optical modulator and a light quantum computer, and relates to the technical field of electro-optical modulation.The bent waveguide structure comprises an input waveguide, a bent waveguide and an output waveguide which are sequentially connected, and the bent waveguide comprises a substrate transmission waveguide layer, an input coupling part and an output coupling part; the input coupling part and the output coupling part are arranged at the two ends of the substrate transmission waveguide layer respectively, a shallow etching groove is formed between the input coupling part and the output coupling part, the input coupling part is connected with the input waveguide, and the output coupling part is connected with the output waveguide. Compared with the prior art, the shallow etching groove is formed between the input coupling part and the output coupling part, so that the thickness of the waveguide film at the bending part is reduced to ensure that the substrate transmission waveguide layer is of a single-mode structure, the transmission loss is reduced, and the bending waveguide is relatively independent from the input waveguide and the output waveguide, so that the transmission efficiency is improved. Therefore, the process precision of the bent waveguide can be independently adjusted, the process time is reduced, and the efficiency is improved.

The invention discloses a preparation method of a thin-film lithium niobate electro-optical modulator and the electro-optical modulator, relates to the technical field of optical communication, and can be used for preparing the electro-optical modulator which is relatively small in size, relatively low in preparation difficulty and low in waveguide transmission loss. The method comprises a first substrate, a grating layer located on the first substrate, a target second dielectric film located on the grating layer, the grating layer is formed by etching a first dielectric film, the surface roughness of the target second dielectric film is smaller than 1 nm, and the refractive index of the target second dielectric film is smaller than that of the first dielectric film; the lithium niobate substrate comprises a lithium niobate thin film formed by ion implantation and a target third dielectric film located on the lithium niobate thin film, and the surface roughness of the target third dielectric film is smaller than 1 nm; bonding the target second dielectric film and the target third dielectric film to obtain a bonding structure; stripping the lithium niobate substrate in the bonding structure; and etching the lithium niobate film to form a ridge-shaped waveguide structure layer, and then forming a waveguide transmission covering layer.

The invention provides a diaphragm type optical fiber liquid level sensing demodulation device and method based on a microwave photon technology, and the device comprises a broadband light source, a circulator, a diaphragm type optical fiber liquid level sensor, an erbium-doped optical fiber amplifier, a polarization controller, a DC power supply, a radio frequency source, an electro-optical modulator, a dispersion compensation optical fiber, a photoelectric detector and a power meter. The broadband light source is connected with a first port of the circulator, a second port of the circulator is connected with the diaphragm type optical fiber liquid level sensor, a third port of the circulator is connected with the erbium-doped optical fiber amplifier, the erbium-doped optical fiber amplifier is connected with the polarization controller, and the polarization controller is connected with the input end of the electrooptical modulator. The radio frequency source is connected with the modulation input of the electro-optical modulator, the direct current power supply is connected with the bias voltage input of the electro-optical modulator, the output of the electro-optical modulator is connected with the photoelectric detector through the dispersion compensation optical fiber, and the photoelectric detector is connected with the power meter, so that the measurement range is expanded while the sensing sensitivity and the resolution ratio are improved.

Exemplary embodiments provide a device [e.g. a circuit, such as a control circuit] for generating a [e.g. time-variable] bias voltage VDC for an electro-optic modulator, wherein the device is configured to obtain an output power signal (I) dependent on an optical output power of the electro-optic modulator, wherein the device is designed to generate the bias voltage VDC on the basis of an amplitude ratio between the fundamental and the first harmonic of the output power signal (I) and on the basis of a phase angle of a pilot signal applied to the electro-optic modulator.

The invention relates to an electro-optical modulator, a preparation method thereof and an electro-optical chip. The electro-optical modulator comprises a substrate, an optical beam splitter, a first optical waveguide, a second optical waveguide, traveling wave electrodes and an electro-optical film, the traveling wave electrodes comprise a first signal electrode and a second signal electrode, the first signal electrode and the second signal electrode are sequentially arranged in the second direction, the first signal electrode and the second signal electrode form a differential electrode, and the first signal electrode and the second signal electrode are sequentially arranged in the second direction. The first signal electrode generates a first electric field when transmitting a first electric signal, the second signal electrode generates a second electric field when transmitting a second electric signal, the directions of the first electric field and the second electric field are opposite, and the refractive index of the electro-optical film is changed under the action of the electric fields to realize electro-optical modulation; part of the electro-optical film, the first optical waveguide overlaps with the first electric field, and the other part of the electro-optical film overlaps with the second electric field. According to the invention, the differential driving of the electro-optical modulator is realized based on the electro-optical film, and the anti-interference capability and the transmission distance of the electro-optical modulator are effectively improved.

The invention discloses a rotor and stator axial clearance online measuring device and method based on optical carrier microwave interference. The measuring device comprises a broadband light source, a first polarization maintaining optical fiber, an electro-optical modulator, a second polarization maintaining optical fiber, an optical fiber circulator, a first single-mode optical fiber and a coated optical fiber probe which are connected in sequence, and the coated optical fiber probe directly faces the axial end face to be measured; a first port of the optical fiber circulator is connected with the second polarization maintaining optical fiber, a second port of the optical fiber circulator is connected with the first single-mode optical fiber, and a third port of the optical fiber circulator is sequentially connected with the second single-mode optical fiber, the photoelectric detector, the signal conditioning unit, the signal acquisition unit and the digital processing unit; the signal acquisition unit is connected with the micro-control unit, the micro-control unit is connected with the microwave frequency sweep signal generation unit, and the microwave frequency sweep signal generation unit is connected with the electro-optical modulator. According to the invention, non-contact on-line high-precision measurement of the axial clearance of the rotor and the stator of the aero-engine under the conditions of limited measurement space and complex signal leading-out path can be realized.

The invention relates to the technical field of semiconductors, in particular to an electro-optical modulation chip, an electro-optical modulator and a forming method of the electro-optical modulator. A Z-cut film lithium niobate chip plane isotropy and a vertical direction modulation electric field are utilized, the defect of crystal axis inversion before and after waveguide bending in the prior art is overcome, flexible and compact layout is realized, and meanwhile, the characteristic that a vertical electrode structure can be modulated when the waveguide is bent and the structure is changed is utilized, so that the device can be applied to the field of waveguide bending, and the device size is not increased. The length of a modulation area is increased, the modulation efficiency is improved, the defects of phase distortion, amplitude attenuation and the like in an existing modulator are overcome, and the modulator has higher speed and wider bandwidth.

The invention provides an electro-optical modulator and an optical transmitter, the electro-optical modulator comprises a first branch waveguide, a second branch waveguide and a radio frequency electrode, the radio frequency electrode comprises a first ground electrode, a first signal electrode, a second ground electrode, a second signal electrode and a third ground electrode which are sequentially arranged at intervals, the first signal electrode and the second signal electrode are configured to receive a driving signal, the first branch waveguide and the second branch waveguide are respectively located in a spacing area between any two adjacent electrodes in the radio frequency electrodes, and the directions of electric fields at the positions of the first branch waveguide and the second branch waveguide are opposite.

The invention provides a lead zirconate titanate composite film with a high electro-optical coefficient, a preparation method of the lead zirconate titanate composite film and an electro-optical modulator, the lead zirconate titanate composite film comprises an insulating substrate, a buffer layer and a ferroelectric main body layer which are sequentially stacked, and the buffer layer is a lanthanum-doped lead zirconate titanate film; the ferroelectric main body layer is a lead zirconate titanate thin film and has (001) / (100) orientation. The composite film has a relatively high electro-optical coefficient, relatively low driving voltage and relatively high thermal stability.

An electro-optic modulator includes a light-splitting element, a light-combining element, two waveguide arms, and a modulation electrode. The two waveguide arms are connected between the light-splitting element and the light-combining element, and each waveguide arm includes a first single-mode waveguide portion, a first coupling portion, a multi-mode waveguide portion, a second coupling portion, and a second single-mode waveguide portion, wherein the width of either of the first single-mode waveguide portion and the second single-mode waveguide portion is smaller than the width of the multi-mode waveguide portion; the first coupling portion is configured to enable light to be coupled into the multi-mode waveguide portion from the first single-mode waveguide portion, and the second coupling portion is configured to enable light to be coupled into the second single-mode waveguide portion from the multi-mode waveguide portion; and the modulation electrode is configured to apply a modulation voltage to the multi-mode waveguide portion of the two waveguide arms.

The invention belongs to the technical field of optoelectronic devices, and provides a laser gyroscope frequency stabilization system and a frequency stabilization method thereof.The laser gyroscope frequency stabilization system comprises a large laser gyroscope to be subjected to frequency stabilization, an electro-optical modulator, an adjusting light path, a signal generator, a mode matching mirror set, a PID regulator, a frequency mixer, a photoelectric detector, an ultra-stable cavity, a low-pass filter, a computer and a data acquisition card; and a square transmission light path is arranged in the ultra-stable cavity. According to the invention, the problem of insufficient isolation caused by an optical isolator consisting of a polarization splitting prism and a 1 / 4 wave plate is effectively avoided, the influence of an optical feedback effect is reduced, and the optical isolator is better adapted to the field of high-precision measurement related to a large laser gyroscope.

A method for processing a radar signal based on a photonic fractional Fourier transformer comprises: transmitting a linear frequency modulation signal to targets to be detected, receiving echo signals of the targets to be measured, and loading the linear frequency modulation signal and the echo signals onto a single-frequency optical wave by an electro-optical modulator (S1); respectively biasing a sub-modulator and a parent modulator of the electro-optical modulator at different bias points, modulating the single-frequency optical wave by the electro-optical modulator based on the linear frequency modulation signal and the echo signals, and outputting a modulated optical signal (S2); converting the modulated optical signal by a photoelectric detector to a photocurrent (S3); and performing Fourier transform on the photocurrent to obtain a fractional Fourier spectrum, and obtaining distance information of the targets to be measured according to peak positions of each pulse signal in the fractional Fourier spectrum (S4).

According to the SERF inertial measurement device electron longitudinal polarizability online measurement and closed-loop method, pumping light can be modulated through an electro-optical modulator to be rapidly switched between a left-hand circular polarization state and a right-hand circular polarization state, the electron spinning direction is overturned accordingly, and the longitudinal polarizability is changed accordingly. The light absorption of the pumping light changes along with the change of the electron spinning longitudinal polarizability, so that the change of the light intensity of the pumping light out of the cylinder reflects the change condition of the electron longitudinal polarizability. And the peak value of the light intensity of the pumping light out of the cylinder under the pulse modulation frequency is demodulated through the lock-in amplifier, so that the on-line measurement of the electron longitudinal polarizability of the SERF inertial measurement device is realized. The light intensity of pumping light entering a cylinder is adjusted by controlling the phase delay amount of the liquid crystal phase delayer LCVR, and the peak voltage of the light intensity of pumping light exiting the cylinder obtained by demodulation of the lock-in amplifier is controlled to remain unchanged, so that the real-time in-situ closed-loop control of the electron longitudinal polarizability of the SERF inertial measurement device is realized.

The invention discloses a calibration-free measurement device and method based on wavelength locked cavity ring-down spectroscopy, and the method comprises the steps: S1, carrying out the frequency modulation of laser wavelengths through an electro-optical modulator driven by a radio frequency signal, and obtaining laser of three wavelengths; s2, when the lasers with the three wavelengths enter the optical resonant cavity, turn-off control is carried out on the lasers with the three wavelengths, and a ring-down curve of e index attenuation is obtained; s3, carrying out ring-down signal fitting processing on the ring-down curves of the three wavelengths to obtain ring-down time data at the three wavelengths; and S4, converting the ring-down time data at the three wavelengths into absorption coefficient data at the three wavelengths, and comparing the absorption coefficient data with spectral parameters of absorption lines in a database to obtain the concentration of the gas to be measured so as to realize calibration-free gas measurement. According to the invention, the gas measurement rate is greatly improved, and the complexity and measurement cost of the system are reduced.

The invention discloses a lithium niobate electro-optical modulator based on interdigital electrodes. The lithium niobate electro-optical modulator comprises a coplanar waveguide electrode structure containing periodically arranged interdigital electrodes, two groups of six modulation waveguides, two groups of four optical waveguide delay lines, two groups of multimode interference couplers, an input waveguide, an output waveguide and a pair of coupling gratings. According to the device, an interdigital electrode structure is used for constructing six electro-optical modulation sections in an upper group and a lower group, and optical waveguide delay lines are used for aligning phases of different electro-optical modulation sections to form an upper group of modulation arms and a lower group of modulation arms. An optical signal enters the input waveguide from the coupling grating on the left side, is divided into two beams through the multi-mode interference coupler, is subjected to equal-size and opposite modulation effects on the upper and lower groups of modulation arms, is combined and coupled in the second multi-mode interference coupler to generate an intensity modulation effect, and is output through the output waveguide and the coupling grating. The electro-optical modulator provided by the invention can be further expanded on the number of times of electrode multiplexing, and is compatible with other multiplexing technologies at the same time.

The invention provides a BOTDR (Brillouin optical time domain reflectometry) system fusing Stokes-anti-Stokes light and a demodulation method, and belongs to the technical field of Brillouin distributed optical fiber sensing. The narrow linewidth laser is used for generating continuous optical signals; the input end of the coupler is connected with the laser, and the output end is connected with the pulse light branch and the local oscillator light branch. The pulsed light branch comprises a semiconductor optical amplifier, a random scrambler, a first erbium-doped optical fiber amplifier and a circulator which are connected in sequence; the local oscillator light branch comprises an electro-optical modulator, and the electro-optical modulator regulates and controls sideband frequency through a microwave module; the second erbium-doped optical fiber amplifier is used for extracting the Stokes light and the anti-Stokes light; the single-mode coupler mixes the double-sideband local oscillator light with the anti-Stokes light and the Stokes light; and the electrical beat frequency signals are acquired, filtered and enveloped and demodulated through an acquisition card. The detection capability of the Brillouin scattering signal is enhanced, the system structure is simplified, and the hardware cost and the maintenance difficulty are reduced.

The invention discloses an optical fiber signal transmission system and method based on quantum noise encryption, and relates to the technical field of optical fiber communication, and the system comprises a composite modulation transmitting module, a dispersion compensation relay module, a coherent receiving module and a digital signal processor. The composite modulation transmitting module comprises an electro-optical modulator and a quantum noise randomization encoder; the dispersion compensation relay module comprises an adjustable dispersion compensator and a Raman amplifier; the coherent receiving module comprises a local oscillator laser and a 90-degree optical mixer; a digital signal processor includes a clock recovery unit and a maximum likelihood sequence detector. All the modules are sequentially connected and cooperatively work. And the adjustable dispersion compensator dynamically applies reverse dispersion compensation calculated based on a dispersion coefficient and a transmission distance according to the dispersion amount monitored in real time. According to the invention, through technologies of quantum noise encryption, dynamic dispersion compensation, Raman amplification, coherent reception and the like, safe and efficient transmission with single-wave 400Gbps and 100km transmission bit error rate less than or equal to 1 * 10 <-12 > is realized.

The invention discloses a reconfigurable microwave photonic filter, which comprises a laser source, an electro-optical modulator, an adjustable feedback type array waveguide grating, a filtering module and a photoelectric detector, and is characterized in that the laser source generates an optical signal and transmits the optical signal to the electro-optical modulator, and the electro-optical modulator modulates the optical signal after receiving the optical signal to form a corresponding sideband; the adjustable feedback type array waveguide grating divides the frequency spectrum of an optical signal into different wavelengths and carries out independent amplitude and phase adjustment on the optical signal with different wavelengths, then the filtering module filters out periodically repeated signals, and the photoelectric detector converts the filtered optical signal into an electric signal, so that optical-electric conversion is completed. The reconfigurable microwave photonic filter and the filtering method have the advantages of being simple in structure, highly programmable in frequency spectrum shape, rapid and reconfigurable in response and high in integration level, and have great attraction to the field of high-frequency signal processing. The application obtains the Young Science Foundation project (62204156) of the National Natural Science Foundation.

According to the Y-type thin-film lithium niobate electro-optical modulator and the manufacturing method provided by the invention, the lithium niobate layer on the electro-optical modulator chip is etched into the corresponding bent waveguide structures, and the two bent waveguide structures are symmetrically arranged on the two sides of the Y-type waveguide structure, so that the height consistency of two optical paths is ensured; according to the bent waveguide structure, the length of the waveguide is guaranteed, meanwhile, the size of the space occupied by the waveguide is reduced, the waveguide with the same length can be carried by adopting a chip with smaller length, and meanwhile, the signal electrode and the ground electrode are arranged on the two sides of each section of straight waveguide in the bent waveguide structure, so that the size of the waveguide is reduced. The optical signal in the waveguide is modulated, and the modulation requirement of the electro-optical modulator is met.

The invention discloses a laser radar range resolution improving device and method based on wavelength division multiplexing, and belongs to the field of laser radar system design and data processing.According to the wavelength division multiplexing principle, multi-wavelength laser signals are emitted, processed and output through a signal modulation module after wavelength division multiplexing, and then a plurality of linear frequency modulation signals are output; in a direct acquisition mode, heterodyne receiving is carried out on the demultiplexed signal, an imaging result of an equivalent large modulation bandwidth signal can be obtained through signal processing, and the method can be used for a laser radar system for high-precision distance measurement. Compared with a traditional single-wavelength laser radar structure, the limitation of the modulation bandwidth of an electro-optical modulator can be broken through, and the emission signal bandwidth is multiplied, so that the range resolution of the laser radar is greatly improved, and the imaging quality of a target object is better; meanwhile, the sampling rate requirement of each channel in a direct sampling mode can be reduced, and the problem that a high-bandwidth signal cannot be collected due to an AD rate bottleneck existing in a direct sampling condition is solved.

Various embodiments may relate to an electro-optic modulator. The electro-optic modulator may include a waveguide configured to carry optical light along a longitudinal length of the waveguide. The electro-optic modulator may also include a first electrically conductive sub-wavelength grating on a first side of the waveguide, the first electrically conductive sub-wavelength grating including a plurality of fingers extending substantially perpendicular to the longitudinal length of the waveguide. The electro-optic modulator may further include a second electrically conductive sub-wavelength grating on a second side of the waveguide opposite the first side, the second electrically conductive sub-wavelength grating including a plurality of fingers extending substantially perpendicular to the longitudinal length of the waveguide. The electro-optic modulator may be configured to modulate the optical light upon application of a potential difference between the first electrically conductive sub-wavelength grating and the second electrically conductive sub-wavelength grating based on Pockels effect.

The invention discloses an in-phase and quadrature demodulation phase modulation optical heterodyne frequency stabilization system for inhibiting an RAM (Random Access Memory), which relates to the technical field of laser frequency stabilization and comprises a laser, an electro-optical modulator, a circulator, an optical resonant cavity, a photoelectric detector, a phase shifter, a frequency mixer, a summator, a low-pass filter, a signal generator and a signal acquisition and processing module. Laser emitted by the laser is modulated by the electro-optical modulator and then enters the circulator, the circulator receives reflected light of the optical resonant cavity and emits the reflected light to the photoelectric detector, and all error signals are obtained through the frequency mixer and the low-pass filter. All error signals are added through an adder and then are input into a signal acquisition and processing module for feedback, so that the frequency of laser emitted by the laser is locked to the resonant frequency of the optical resonant cavity; according to the frequency stabilization system, a plurality of modulation frequencies are introduced to modulate the laser phase in the electro-optical modulator, so that the influence of RAM noise on frequency stabilization is suppressed.

The present disclosure is directed, in general, to (1) nonlinear optical (NLO) chromophores containing spirofluorene-isophorone bridging groups, including (2) compositions / materials / resistive layers comprising NLO chromophores containing spirofluorene-isophorone bridging groups, and the methods of making the compositions / materials / resistive layers comprising NLO chromophores containing spirofluorene-isophorone bridging groups (e.g., methods of poling and / or drying, and the like), (3) uses of NLO chromophores containing spirofluorene-isophorone bridging groups in electro-optic devices (e.g., EOMs).

The invention provides an electro-optical modulator combining a slow light waveguide and a capacitive load type traveling wave. The electro-optical modulator comprises the slow light waveguide, a capacitive load type traveling wave electrode, a multi-mode interferometer, a mixed single-mode waveguide, a micro-ring structure and a micro-ring upper phase adjusting electrode. Capacitive load type traveling wave electrodes are arranged between and on the side edges of a pair of slow light waveguides which are arranged in parallel, the two ends of the slow light waveguides are connected to one end of a multimode interferometer through mixed single-mode waveguides respectively, the other end of the multimode interferometer is provided with two ports, one port is used for being connected with a micro-ring structure, and the other port is used for being connected with a micro-ring structure. The other port is used as the input end or the output end of the electro-optical modulator, and the two sides of the micro-ring structure are provided with micro-ring upper phase adjusting electrodes. The group refractive index and the working bandwidth of light can be regulated and controlled by adjusting the geometric parameters of the slow light waveguide, and low dispersion and high group refractive index can be realized in a wide optical bandwidth range; through a sectional capacitance load type slow wave electrode structure, the regulation and control of the microwave refractive index are realized, and the electro-optical modulation bandwidth is improved.

The invention provides an electro-optical modulator and a modulation method thereof, the electro-optical modulator comprises a substrate, a buried oxide layer and a lithium niobate waveguide layer are sequentially stacked on the substrate, and the lithium niobate waveguide layer comprises a first optical waveguide and a second optical waveguide; the electrode layer comprises a composite traveling wave electrode and a direct-current electrode, and the direct-current electrode is arranged on one side, in the signal transmission direction, of the composite traveling wave electrode; wherein the composite traveling wave electrode comprises a metal electrode and a polymer electrode, the metal electrode is embedded into the buried oxide layer, the polymer electrode is arranged on the surface of the buried oxide layer, and the composite traveling wave electrode is arranged between the first optical waveguide and the second optical waveguide and arranged on the side faces of the first optical waveguide and the second optical waveguide respectively; wherein the direct current electrode is arranged between the first optical waveguide and the second optical waveguide. The electro-optical modulator is high in electro-optical conversion efficiency, the plasma effect caused by light field coupling is effectively avoided, and the light loss of the device is remarkably reduced.

The invention relates to the technical field of optical microscopic imaging, and discloses a scanning structured light microscopic imaging system and method based on a multi-focus diffraction-free light beam. Exciting light emitted by a laser light source sequentially passes through an electro-optical modulator and a lens group I and then enters a spatial light modulator; the spatial light modulator is used for synchronously regulating and controlling the multi-focus array and the non-diffraction light beam to generate the multi-focus array with the non-diffraction light beam characteristic; afterwards, the light sequentially passes through a lens group II, a two-dimensional scanning galvanometer, a scanning lens, a tube lens, an emission optical filter, a double-color piece and an objective lens and then irradiates a sample to be imaged; fluorescent light generated by a to-be-imaged sample passes through the objective lens and the double-color sheet and then is transmitted to the area-array camera, and fluorescent light signals at a plurality of focal points are collected to form a fluorescent light image. According to the invention, a diffraction-free optical phase modulation mechanism is introduced, simultaneous imaging of different depth layers is realized, the imaging speed is improved, sample information missed due to limited focusing depth is avoided, and the optical power utilization rate and the imaging quality are greatly improved.

The invention belongs to the technical field of microwave photon links, and particularly relates to a high-resolution microwave photon frequency measurement system based on real-time Fourier transform. The link comprises a mode-locked laser, a first dispersion compensation module, a second dispersion compensation module, a dual-drive Mach-Zehnder modulator, a Mach-Zehnder modulator, a dispersion optical fiber, a time lens, an erbium-doped optical fiber amplifier, a photoelectric detector and an oscilloscope; the mode-locked laser outputs femtosecond Gaussian light pulses, and the femtosecond Gaussian light pulses are injected into the first dispersion compensation module and then stretched into chirp light pulses; modulating the chirp light pulse through electro-optical modulators which are connected in parallel; the modulated optical signal is subjected to time amplification processing through a dispersion optical fiber, a time lens, a second dispersion compensation module and an erbium-doped optical fiber amplifier in sequence; and the optical signal after time amplification processing is converted into a microwave pulse carrying frequency information of the signal to be detected by a photoelectric detector, and the microwave pulse is observed by an oscilloscope.