141 results about "Optical comb" patented technology

An optical comb generator receives light from at least two continuous wave laser sources, produces a different frequency comb from each laser source, and produces an output that it the simultaneous combination of the different frequency combs. The different frequency combs span different frequency bands, but at least partially overlap in frequency with an adjacent comb in a region of overlap. A spectral filter produces a filtered output that has at least one pair of tones from the region of overlap, the pair of tones comprising one tone from each of two adjacent combs. Feedback control based on the filtered output is applied to adjust the light entering the comb generator such that the frequencies and phases of the pair of tones from the region of overlap are aligned. In this way, the multiple different overlapping combs are stitched together to form a single seamless comb spanning a broader frequency range.

The invention discloses a pattern wafer multi-parameter synchronous detection system and method based on double optical combs, and belongs to the field of wafer quality detection. The system comprises a signal light path, a reference light path, a detection light path and a synchronous detection module. After interference, the detection light beam and the reference light beam are decomposed into an H path and a V path through the polarization beam splitter, and are synchronously detected by the first camera and the second camera. The invention also provides a method which comprises the following steps: synchronously acquiring two paths of time domain interference data; fourier transform is carried out on each pixel point to obtain a plurality of spectrum pairs; the processing unit decodes in parallel based on the spectrum pair, and synchronously inverts multi-dimensional physical parameters such as three-dimensional morphology, stress and film parameters of the pattern wafer; and finally, comparing and identifying defects. According to the method, the problems of low detection efficiency and single information dimension in the prior art are solved, and wide-field, high-speed, high-precision and multi-parameter synchronous comprehensive characterization is realized.

The invention relates to the technical field of ultrafast laser and light quantum, and provides a single-cavity double-optical-comb absolute distance measurement system and method based on repetition frequency scanning. The system comprises a single-cavity double-optical comb system which is used for simultaneously establishing clockwise and anticlockwise propagating mode-locked pulses in an annular cavity through a bidirectional pumping source and outputting a main oscillation optical comb and a local oscillation optical comb through a polarization maintaining optical fiber coupler; a first piezoelectric ceramic and a second piezoelectric ceramic are arranged in the annular cavity, and the first piezoelectric ceramic and the second piezoelectric ceramic are adjusted through a differential driving mode so as to lock and regulate the repetition frequency difference between the main oscillation optical comb and the local oscillation optical comb; the double-optical-comb distance measuring system is used for combining the main oscillation optical comb passing through the Michelson interferometer with the local oscillation optical comb not passing through the Michelson interferometer to generate a radio frequency beat frequency signal; and calculating the real-time absolute distance of the measured target according to the optical path difference of the radio frequency beat frequency signal and the repetition frequency difference of the main oscillation optical comb and the local oscillation optical comb.

The invention relates to the technical field of spectral measurement, in particular to a quantum correlation enhanced optical comb spectrum device and method, and the method comprises the steps: processing pump light and seed light to obtain idler frequency light and intrinsic light with quantum correlation; performing time domain matching adjustment on the idle frequency light, and reflecting the idle frequency light after the time domain matching adjustment to obtain a time-matched quantum correlation light beam; combining the intrinsic light and a continuous laser to obtain a first combined light; the mid-infrared light comb generates mid-infrared light carrying gas information after penetrating through the sample cell containing the gas to be detected; the light after the first beam combination and the mid-infrared light carrying the gas information are combined to obtain light after the second beam combination, frequency conversion processing is carried out, and then a near-infrared light comb is output; and processing the quantum correlation light beam and the near-infrared light comb which are matched in time, and outputting a double-light comb signal. Through combination of a quantum correlation mechanism and a frequency conversion technology, the intermediate infrared spectrum detection signal-to-noise ratio is remarkably improved, and high-sensitivity and high-speed parallel quantum enhanced spectrum is realized.

The invention relates to a double-optical-comb laser and a laser spectrum measurement system, and the double-optical-comb laser comprises a pumping source which is used for generating pumping light. The optical fiber amplifier is connected with the output end of the pumping source, and the output end of the optical fiber amplifier is connected with the first optical fiber coupler. The first optical fiber coupler is connected with the first mode-locked laser cavity and the second mode-locked laser cavity. An output light path of the first mode-locked laser cavity is connected with the second optical fiber coupler, an output light path of the second mode-locked laser cavity is connected with the second optical fiber coupler, and the second optical fiber coupler is used for carrying out beam combination and frequency beating on the two paths of laser. The optical path delay line is used for adjusting the laser repetition frequency difference between the first mode-locked laser cavity and the second mode-locked laser cavity. The double-optical-comb laser not only overcomes the defects that an existing double-optical-comb system is complex, expensive and inconvenient to tune, but also has the advantages of being compact in structure, high in stability, high in output pulse energy and tunable in repetition frequency difference.

The invention discloses a device for generating Mach-Zehnder interference, a photo-thermal spectrum gas sensing device based on the device and a detection method, and belongs to the technical field of laser spectrum gas sensing. The interference device sequentially comprises an optical frequency comb and a first light beam splitter on a light transmission path; a movable arm reflector group is arranged on the light path of one light beam B in the two light beams split by the first light beam splitter, the path of the light beam B is changed through the movable arm reflector group, the light beam B intersects with the light path of the other light beam C, and a beam combiner is arranged at the intersection; the movable arm reflector group is connected with a driving mechanism, the driving mechanism is used for driving the movable arm reflector group to do linear motion, and the track of the linear motion is parallel to the straight line where the light beam B is located. The interference device does not need to use a local oscillator optical comb and a signal optical comb to carry out multi-heterodyne interference, can directly use the moving speed of a movable arm reflector group in a Mach-Zehnder interference structure to calculate a down-conversion factor, and maps each longitudinal mode of the signal optical comb in an optical frequency to a radio frequency component one by one.

The invention provides a terahertz frequency comb generation verification method and system based on an optical fiber microcavity optical frequency comb, and the method comprises the steps: injecting a continuous wave laser into an optical fiber microcavity resonator to generate a stable Kerr optical frequency comb, enabling the Kerr optical frequency comb to work in a single soliton state or a soliton crystal state, and obtaining an optical frequency reference with low phase noise. Furthermore, spectrum selection is performed on the optical frequency comb, multiple groups of optical comb tooth pairs comprising comb teeth of different orders are actively selected, and the optical frequency difference of each group of comb tooth pairs is directly converted into an electric signal in a terahertz frequency band by utilizing a beat frequency effect of a photoelectric detector. A plurality of terahertz electric signals generated by different comb tooth pairs are integrated to form a multi-channel terahertz frequency comb. The method allows a plurality of discrete and frequency-controllable terahertz signal channels to be generated in parallel on a single optical platform through one-time optical processing and photoelectric conversion, so that multichannel terahertz frequency comb generation is realized.

This invention discloses a vehicle-mounted dual-optical-comb system for outdoor testing, comprising an oscillator module, a power amplifier module, a frequency conversion module, a gas measurement module, a signal detection, acquisition, and processing module, and a vehicle-mounted platform module. The oscillator module generates two optical frequency comb signals with slightly different repetition frequencies. The power amplifier module amplifies the two optical frequency comb signals. The frequency conversion module outputs a combined dual-optical-comb beam. The gas measurement module enables the dual-optical-comb beam to interact with the gas to be tested in an open environment. The signal detection, acquisition, and processing module receives the optical signal absorbed by the gas to be tested, converts it into an electrical signal, and acquires and processes the electrical signal to obtain the absorption spectrum information of the gas to be tested. The vehicle-mounted platform module is used to fix and install each module. The advantages of this invention are: stable operation, strong resistance to environmental interference, low power consumption, and suitability for long-term vehicle-mounted operation.

A light emitting device and method thereof, and a gas analysis system and method thereof, are disclosed. The light emitting device includes: an optical comb light source configured to generate an initial light signal; an encoding module configured to encode the initial light signal based on a preset comb code to form a light signal to be processed; and a modulation module configured to perform quantum noise compression on the light signal to be processed to form an emitted light signal. This invention belongs to the field of precision measurement. Through a collaborative architecture of "compressed optical comb + computational encoding," optical comb spectroscopy technology achieves improvements in multiple dimensions, including sensitivity, environmental adaptability, speed, and system complexity.

The invention discloses a distributed radar and laser radar system based on a chaotic optical comb, and belongs to the technical field of microwave photonics and laser. The distributed radar and laser radar system comprises a chaotic optical comb signal generation module, a wavelength division multiplexer, N optical fibers and N radar and laser radar modules. A chaotic optical comb signal generated by the chaotic optical comb signal generation module is divided into N single chaotic optical signals with different wavelengths in the wavelength division multiplexer; the N single chaotic optical signals with different wavelengths are respectively transmitted to the N radar and laser radar modules at different spatial positions through the N optical fibers, so that spatial distribution of the signals is realized. The single chaotic optical comb signal source is combined with the wavelength division multiplexer and the optical fiber, sensing signals are provided for a plurality of radar and laser radar modules which are arranged in a distributed mode, generation and distribution of multi-path distributed sensing signals are achieved, a traditional multi-source scheme is replaced, system cost, size and complexity are reduced, and compact 360-degree annular sensing array deployment is supported.

The invention discloses a high-performance optical comb laser based on heterogeneous material integration and multi-effect fusion, belongs to the technical field of optical communication and laser devices, and aims to solve the problems that a traditional optical comb laser is difficult to start tuning, low in power efficiency, large in line width or limited in bandwidth and the like. A scheme of heterogeneous integration of a III-V group gain material, a low-loss Si3N4 waveguide and a high-electro-optical coefficient barium titanate (BTO) material is adopted, an outer cavity chip comprises a high-Q-value annular resonant cavity, an electro-optical comb is generated by modulating the annular resonant cavity, then a Kerr comb is excited, and the optical comb is amplified through gain. According to the invention, three mechanisms of electro-optical modulation, Kerr effect and semiconductor light amplification are fused, and based on device topological structure innovation and unit device optimization, the problems are solved, the on-chip frequency comb performance is significantly improved, and the optical comb laser with excellent starting and tuning performance, high power, large bandwidth and narrow line width is realized.

In a multi-point vibration measurement device, measurement errors caused by mixing of unwanted reflection components generated by various optical elements, such as an optical branching / multiplexing element provided on an optical path through which measurement light irradiated to a measurement surface via an interference optical system passes, into interference light required for multi-point vibration measurement can be eliminated. Therefore, multi-point vibration measurement can be carried out with high precision. In a multipoint vibration measurement device (100), an optical branching / multiplexing head (130) is provided with: an optical branching / multiplexing optical system (131) comprising an optical branching element (131A) connected to an interference optical system (120) to which measurement light (LS) is input from a light source (110), and an optical multiplexing element (131B) connected to the interference optical system (120); a projection optical system (133) that irradiates a plurality of points on a measurement surface (5) of a measurement object with the frequency components of the respective optical combs of the measurement light (LS) split by the light splitting element (131A); and a coupling optical system (132) that inputs, to the projection optical system (133), the frequency components of the respective optical combs included in the measurement light (LS) demultiplexed by the optical demultiplexing element (131A), and that inputs, to the optical multiplexing element (131B), the frequency components of the respective optical combs of the measurement light (LS) reflected and returned by the measurement surface (5).

The application discloses an engine rotor multi-parameter measurement system and method, and the system comprises a first optical comb, a second optical comb, a polarization maintaining optical fiber amplifier, a polarization maintaining optical fiber beam splitter, an integrated polarization maintaining optical fiber ring, an integrated polarization maintaining optical fiber beam combiner, a plurality of high-temperature-resistant optical fiber probes, a high-speed photoelectric detector and a data acquisition and processing system; the pulse repetition frequency of the first optical comb is greater than that of the second optical comb, and the two have a high repetition frequency difference; the plurality of high-temperature-resistant optical fiber probes respectively generate reference light pulses and measurement light pulses; the scanning light pulses emitted by the second optical comb respectively interfere with the plurality of reference light pulses and the plurality of measurement light pulses to generate double-comb interference reference signals and double-comb interference measurement signals; through processing of the reference signals and the measurement signals of each channel, the engine rotor speed, the blade tip clearance, the blade tip timing and the blade vibration parameters are obtained. The application has the advantages of high measurement speed, high measurement accuracy and multi-parameter synchronous measurement.

A purpose of the present invention is to provide an optical comb generation device capable of obtaining an absolute distance result with high accuracy by reducing a phase offset by a signal transmission path of an object other than an object to be measured, for example in an optical comb distance meter for measuring a distance from a time difference between an interference signal of a measuring light and an interference signal of a reference light. A drive control unit controls to output M (M is an integer of two or more) types of optical combs with mutually different modulation frequencies in which N (N is an integer of three or more) types of modulation frequencies are switched cyclically, by respectively modulating a phase or an intensity periodically, from M optical comb generators, by supplying driving signals to the M optical comb generators comprised in an optical comb generation unit.

The present invention provides a low relative phase noise optical comb generator device, which stabilizes the repetition frequency of an interference signal of an optical comb by reducing the relative phase noise of driving signals of different frequencies for driving a plurality of optical comb generators in an optical comb range finder. It is provided with: at least three oscillators (13, 13A, 13B) that generate frequency signals whose phases are synchronized with the phase of a reference frequency signal (F REF ) provided by a reference oscillator (11) and whose frequencies are different from each other; and at least two frequency converters (14A, 14B) that are input with a frequency signal obtained by one of the three oscillators (13) and each frequency signal obtained by each of the oscillators (13A, 13B) other than the one oscillator, wherein the at least two frequency converters (14A, 14B) respectively supply, as driving signals, at least two kinds of modulation signals of a sum frequency signal or a difference frequency signal of the frequency signal of the one oscillator and the frequency signal of the other oscillator whose phase noise is smaller than that of the frequency signal of the one oscillator, whose relative phase noise is reduced, to at least two optical comb generators (15A, 15B).

An anti-glare film is attached on a surface of a display, and includes an anti-glare layer. The anti-glare layer is set to have a sparkle value falling within a range from 6 to 10, which is defined based on a value of a standard deviation of luminance distribution of the display under a state in which the anti-glare film is attached on the surface of the display, a value of specular gloss of 30% or less, which is measured with 60-degree specular gloss, a value of transmission image clarity of 60% or less, which has an optical comb of 0.5 mm, and a haze value of 50% or less. Consequently, satisfactory anti-glare property can be provided while appropriately suppressing sparkle on the display.

The invention discloses an atomic optical frequency standard rapid self-locking system, which comprises a clock laser, and the output of the clock laser is divided into a first path of modulation laser and a second path of modulation laser after sequentially passing through an ultra-stable cavity system, a frequency power modulation optical system and a first spectroscope. The spectral data acquisition system acquires spectral data generated when a first path of modulation laser enters the atomic system physical system, the spectral data acquisition system is respectively connected with the servo feedback system and the integrated automatic control system, and the servo feedback system is connected with the frequency power modulation optical system; the output of the femtosecond optical comb and three paths of modulation laser divided from the second path of modulation laser are subjected to beat frequency to generate beat frequency signals which enter the photoelectric detector; and the laser, the ultra-stable cavity system, the frequency power modulation optical system, the laser frequency scanning system, the atomic system physical system and the femtosecond optical comb are respectively connected with the integrated automatic control system. The invention further discloses a rapid self-locking method for the atomic optical frequency standard, and rapid locking of the optical frequency standard is achieved.

An optical comb light source outputs an optical comb having a plurality of modes. The optical comb light source includes an optical comb generating section, an optical frequency changing section, and a mode optical frequency controlling section. The optical comb generating section generates the optical comb. The optical frequency changing section receives a reference wavelength light having a predetermined optical frequency and changes the optical frequency of the reference wavelength light for output. The mode optical frequency controlling section controls a mode optical frequency that is an optical frequency of one mode of the plurality of modes such that a difference between the mode optical frequency and a target optical frequency that is an optical frequency of an output from the optical frequency changing section has a predetermined value. The optical comb generating section changes optical frequencies of the plurality of modes according to the controlled mode optical frequency.

This invention discloses a terahertz band optical comb frequency converter, belonging to the field of frequency conversion technology. The frequency converter includes an optical fiber interface, an optical fiber focusing lens, a frequency converter chip, a hemispherical silicon lens, and an electrical interface. The frequency converter chip includes antenna electrodes, a photoconductor, and an InP substrate. An external 1560nm femtosecond optical comb signal sequentially passes through the optical fiber interface and the optical fiber focusing lens onto the frequency converter chip; simultaneously, an external terahertz signal under test passes through the hemispherical silicon lens onto the frequency converter chip. The antenna electrodes and the electrical interface are connected by a circuit. This invention offers a wider response bandwidth: the response bandwidth is increased through the design of internal defects in the photoconductor; higher sensitivity: the sensitivity of the frequency converter is improved through antimony doping and tungsten oxide thin film design; and higher reliability: the tungsten oxide thin film design and special protection design of the antenna electrodes can respectively avoid damage to the frequency converter caused by optical and electrical signals, thereby improving reliability and service life.

The application discloses a kind of background noise suppression systems of dual optical comb coherent raman spectrum of probe light delay control, by setting the laser that light frequency comb light source module is emitted into probe light and pump light by first beam splitter in probe light delay control module, and setting optical delay line is applied to the probe light with delay amount, utilize the characteristics that the decay time of coherent raman spectrum signal is longer than the decay time of background noise, probe using probe light with delay amount, realize the purpose of inhibiting background noise, it is beneficial to improve the signal-to-noise ratio of dual optical comb coherent raman spectrum measurement system, inhibits spectrum signal distortion.

The invention relates to a laser chaotic secret communication system based on coherent pumping phase conjugation, which belongs to the technical field of laser communication and comprises a signal transmitting module, an optical fiber link module, a conjugate transpose module and a signal receiving module. The signal transmitting module generates and modulates a chaotic carrier optical signal, and data encryption is realized through phase modulation; the optical fiber link module is used for long-distance signal transmission; the conjugate transpose module adopts an optical comb to generate coherent pump light, and generates phase conjugate waves through four-wave mixing to realize compensation of dispersion and nonlinear distortion in an optical fiber link; and the signal receiving module recovers original data through chaotic synchronization, coherent detection and digital signal processing. The phase locking characteristic of coherent pumping is utilized, the phase noise influence in a traditional pumping system is reduced, the stability of the system is improved, the anti-interference performance of chaotic secret communication and the transmission quality of the system are improved, and a feasible scheme is provided for achieving high-fidelity and high-safety long-distance optical communication.

The invention discloses a programmable optical frequency comb light source based on a dispersion reconfigurable microcavity, and the structure of the programmable optical frequency comb light source comprises a grating writing and dispersion detection module, an integrated microcavity module with a photoinduced refraction characteristic, an optical comb pumping and spectrum sensing module, and a feedback control and signal processing module. The working principle is as follows: on a micro-ring resonant cavity with a photorefractive effect, laser is written into a programmable Bragg grating, so that a dispersion curve of the micro-cavity is reconstructed in real time; then, an intelligent feedback closed loop is formed by monitoring the spectrum and repetition frequency of the output optical comb and comparing the spectrum and repetition frequency with a target set by a user, and the grating pattern is automatically adjusted until the output spectrum is matched with the target. The programmable optical frequency comb light source can be dynamically reconstructed or switched according to different application requirements. The programmable optical frequency comb can be used as a light source module of a co-packaging optical technology, bandwidth density is improved, power consumption is reduced, and therefore the programmable optical frequency comb can be widely applied to interconnection of next-generation data centers.

The invention relates to the technical field of power equipment on-line monitoring and fault diagnosis, and discloses a GIL temperature distribution detection device based on double optical comb coding BOTDA, which comprises a GIL temperature sensing optical fiber, a double optical comb signal generation assembly, an optical transmission and detection assembly and an intelligent control and calculation system. The sensing optical fiber is attached to the surface of the GIL through a suspension type loose tube structure, and stress cross sensitivity is eliminated. The double-optical-comb assembly generates a pumping and detection optical comb loaded with random phase codes, and the peak-to-average power ratio is reduced to suppress modulation instability. The transmission assembly is matched with distributed Raman amplification to realize long-distance bidirectional injection, and optical downsampling is realized by using an optical comb beat frequency effect. And the control system executes closed-loop gain adjustment according to a comparison result of the detection power and a nonlinear threshold value, and calculates the temperature through space-time mapping. According to the invention, the contradiction between the signal-to-noise ratio and the nonlinear effect in long-distance sensing is solved, and high-precision and rapid GIL whole-line temperature monitoring is realized.

The invention provides a preparation method of an anti-aging optical resonant cavity, and relates to the field of optical instrument manufacturing and application. Comprising the steps of zero expansion point measurement, drift rate measurement, aging pretreatment, monitoring and compensation of the optical resonant cavity. The zero expansion point measurement and the drift distance measurement can be obtained by adopting different methods such as a reference cavity beat frequency method, an optical comb measurement method and an optical clock measurement method; the aging pretreatment comprises two modes of high-temperature accelerated aging and long-term stable storage, so that the performance of the material reaches a stable state; and monitoring and compensating, namely compensating the linear drift rate by measuring the frequency drift rate. The problem that the ULE glass is inevitably aged in long-term use is solved.

To provide a method of correcting a beat signal that functions correctly even when a beat signal corresponding to a frequency component other than a 0th order component among optical comb frequency components is corrected.SOLUTION: A noncontact-type distance measurement device includes: an optical frequency comb generator 7 that replicates incident light into light of a plurality of different frequencies; a main interferometer 20 that detects a minimum beat frequency obtained by interference between the light of a plurality of frequencies and the reference light or probe light not incident on the optical frequency comb generator 7; an auxiliary interferometer 21 for acquiring a phase X(t) due to interference between one and the other delayed by a delay device 6; and a calculation unit 11 for calculating a phase XN(τ) of frequency swept light at a delay time τ based on the phase X(t) and the influence of frequencies other than the frequency corresponding to the reference light or the probe light among a plurality of different frequencies, and for correcting the nonlinearity of the frequency swept light at the minimum beat frequency obtained by the main interferometer 20.SELECTED DRAWING: Figure 1

The invention discloses a method and system for expanding a non-fuzzy distance based on polarization multiplexing double optical combs, and the method comprises the following steps: the polarization multiplexing double optical combs generate two groups of pulse sequences with different repetition frequencies, one part of the pulse sequences serves as local oscillator light, and the other part of the pulse sequences serves as probe light to enter a distance measurement module; the detection light is divided into two parts, the two parts enter a reference light path and a target light path respectively and then are reflected by two reflectors respectively, then the two parts and the local oscillation light are subjected to frequency beating respectively, two groups of interferograms carrying reference position information and target position information respectively are obtained, and the time interval in the two groups of interferograms is measured and combined with the repetition frequency of a double-optical-comb pulse sequence, so that the target position information is obtained. And the distance to be measured, namely the length difference between the reference light path and the target light path, can be calculated. The problem that the non-fuzzy distance of a traditional double-optical-comb system is small is solved in a simple and reliable mode, and the measurable absolute distance is increased by multiple orders of magnitude.

The invention relates to the technical field of optical sensing and trace gas detection, in particular to an optical comb tooth space-time multiplexing photoacoustic spectrum detection device and method, and the device comprises a light source module, a modulation module, a dispersion light splitting module and an acoustic detection module. According to the device, a frequency comb is used as a light source, comb tooth light with different wavelengths is separated in parallel in space through intensity modulation and spatial dispersion light splitting, and multiple paths of light channels for synchronously exciting gas to be detected are formed. The acoustic detection module receives the excited photoacoustic signal and converts the photoacoustic signal into an electric signal. According to the invention, a traditional serial scanning or mechanical interference mode is innovated into parallel synchronous detection of multi-component gas, high-sensitivity and high-selectivity recognition of various trace gases is realized in single measurement, and the bottlenecks of the prior art in the aspects of detection efficiency, response speed and multi-component synchronous analysis capability are effectively solved.

The invention discloses a double-optical comb interlocking system based on self-injection locking. The system comprises a first DFB laser, a second DFB laser, a first micro-ring, a second micro-ring, a first waveguide, a second waveguide, a third waveguide, a first electro-optical modulator, a second electro-optical modulator, an adjustable optical filter, a photoelectric detector, a microwave source, a phase-locked loop, a signal source, a frequency mixer and a frequency locking circuit. Back scattering light in the second micro-ring is fed back to the second DFB laser, so that the output wavelength of the second DFB laser is locked to the pumping wavelength of the first DFB laser, and the first degree of freedom of the double optical combs is locked; a micro-cavity optical comb generated by a first micro ring pumped by the first DFB laser device is used as a main comb, a micro-cavity optical comb generated by a second micro ring pumped by the second DFB laser device is used as a slave comb, the other group of aligned comb teeth are filtered out through the adjustable optical filter except for the pumping light wavelength, comb tooth beat frequency signals are subjected to frequency doubling and then locked with the repetition frequency difference of the main comb and the slave comb, and the frequency of the comb teeth is adjusted. Therefore, the second degree of freedom of the double optical combs is locked. According to the invention, interlocking of the self-injection locking double optical combs can be realized.

Disclosed is a real-time representation device for the GHz pulse repetition frequency based on dual-optical-comb spectroscopy. The device comprises a signal optical comb light source, a first polarization controller, a polarization beam splitter, a local oscillator optical comb light source, a first optical coupler, a second optical coupler, a first photoelectric detector, a third optical coupler, a second photoelectric detector, a high-speed oscilloscope, and a data processing module; real-time measurement of GHz pulse repetition frequency dynamics is realized; dual-optical-comb spectroscopy measurement technology is used to carry out real-time measurement on the spectral characteristics of the GHz pulse repetition frequencies of different soliton types; and the device has the advantages of high spectral resolution, high refresh rate, system integration, and the like, and solves the problems of the soliton evolution phenomenon of optical fiber lasers of special wavebands such as 2 μm, and transient changes of GHz pulse repetition frequency dynamics being difficult to effectively represent by means of a traditional average measurement method, and the like.

This invention discloses a terahertz signal generation system and method based on space-based optical radio frequency technology, comprising an optical comb generation module, an optical carrier frequency selection and modulation module, a transmission module, and a photoelectric conversion module arranged sequentially. The optical comb generation module generates an optical frequency comb. The optical carrier frequency selection and modulation module selects at least two optical carriers from the optical frequency comb and modulates the optical carriers with radio frequency signals to obtain multiple optical signals. The invention utilizes space-based optical radio frequency technology to achieve the generation and transmission of ultra-wideband terahertz signals, overcoming the bandwidth limitations of traditional electronic technology and the problem of excessive loss of terahertz signals during long-distance transmission. Optical injection locking technology is used to suppress spurious signals generated during optical domain signal processing. Furthermore, the reconfigurable generation of terahertz signals can be achieved through the joint control of the local oscillator signal and dual lasers, realizing the generation and transmission of high-speed, stable, and low-spurious broadband terahertz communication signals.