98 results about "Frequency shifter" patented technology

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.

The invention relates to the technical field of semiconductor lasers, and particularly provides a tunable narrow-linewidth multi-wavelength laser based on injection locking, which comprises a light source, an optical splitter, a coupler, a photoacoustic frequency shifter and a micro-ring, the optical path of each sub-beam is provided with a photoacoustic frequency shifter and a micro-ring, the photoacoustic frequency shifters are responsible for adjusting the frequency of the sub-beams, the micro-rings and a light source form an injection locking relation and compress the line width of the sub-beams, then all the sub-beams are combined through a coupler, and finally power amplification is conducted through a semiconductor optical amplifier. Through the optical splitter, the photoacoustic frequency shifter and the micro-ring, the single light source system outputs equally-spaced multi-wavelength laser, and the defects of a traditional multi-light-source design are overcome.

An OCT instrument comprising: an optical coupler which generates signal light and reference light from a swept narrowband light source; a detector which samples a time-varying interference signal based on the reference light and signal light returned from a sample; an adjustable optical frequency shifter which: generates a first sideband light by adjusting an optical frequency of the reference light, such that the detector unit samples a first time-varying interference signal resulting from an interference between the sideband light and the returned signal light; and maintains the optical frequency of the reference light such that the detector unit samples a second time-varying interference signal resulting from an interference between the reference light and the returned signal light. The OCT instrument generates a respective axial depth profile of the sample based on each of the sampled first time-varying interference signal and the sampled second time-varying interference signal.

The invention discloses a frequency stabilized laser based on a double-fiber interferometer. The frequency stabilized laser comprises a narrow linewidth laser, an acousto-optic frequency shifter, a 1 * 2 fiber splitter I, the double-fiber interferometer, a voltage-controlled oscillator and a control module, the output end of the narrow linewidth laser is connected with the input end of the acousto-optic frequency shifter, and the two input ends are connected with the second output end and the third output end of the control module respectively. The driving input end of the acousto-optic frequency shifter is connected with the output end of the voltage-controlled oscillator, and the output end of the acousto-optic frequency shifter is connected with the input end of the 1 * 2 optical fiber splitter I; one output end of the 1 * 2 optical fiber splitter I outputs a frequency-stabilized laser signal, and the other output end of the 1 * 2 optical fiber splitter I is connected with the input end of the double-optical-fiber interferometer; the output end of the double-fiber interferometer is connected with the input end of the control module; the first output end of the control module is connected with the voltage-controlled oscillator, and the second and third output ends are connected with the narrow linewidth laser. According to the invention, laser signal output with high precision and high frequency stability is realized, and the frequency stability of the laser is three to four orders of magnitude higher than that of a narrow linewidth laser.

The invention discloses a test method and device for measuring nonlinearity of a phase modulator, and belongs to the technical field of measurement, the device comprises a laser source, a polarization controller, a beam splitter, the phase modulator, a coupler, a photoelectric detector, a microwave source I, an acousto-optic frequency shifter, a microwave amplitude phase detection module and a microwave source II; the laser source is used for outputting a fixed-frequency optical signal to the polarization controller; the polarization controller is used for compensating the polarization state of the optical signal; the beam splitter is used for equally dividing an optical signal into two paths, the first path of optical signal is transmitted to the phase modulator, and the second path of optical signal is transmitted to the acousto-optic frequency shifter; by means of the mode, the problem that the phase modulator directly enters the photoelectric detector, photoelectric conversion cannot be conducted, and nonlinear parameters cannot be detected is solved.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.

The application discloses a device and method for coexistence of bright-dark solitons based on a mode division multiplexing resonant cavity, and relates to the technical field of lasers.The device for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity comprises an erbium-doped fiber amplifier, a first optical coupler, an acousto-optic frequency shifter, a second optical coupler, a third optical coupler, a first mode selection coupler, a second mode selection coupler and a fiber ring resonant cavity, and the fiber ring resonant cavity is a non-uniform dispersion few-mode fiber.The device and method for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity can realize stable coexistence of bright-dark solitons.

This light source device comprises: a first mode-locked laser light source that emits first output light; a second mode-locked laser light source that emits second output light; a first frequency shifter that sets the repetition frequency of the first output light to a first drive frequency; and a second frequency shifter that sets the repetition frequency of the second output light to a second drive frequency. The first drive frequency is different from the second drive frequency. The first drive frequency is different from the value of the repetition frequency of the first output light when the first frequency shifter is not operating.

The application discloses a microwave photon frequency hopping signal generation device and method based on an optical switch and belongs to the technical field of optical communication. The application is composed of a light source, a beam splitter, an optical frequency comb generator, an electro-optical frequency shifter, an acousto-optic modulator, a digital frequency synthesizer, a filter array, a signal control unit, an electrically controlled high-speed optical switch, a beam combiner and a photoelectric detector. The application separates optical frequency comb teeth by using an ultra-narrow bandwidth optical filter, selects and opens the frequency hopping signal generated by the local light beat frequency through the optical switch, and can generate a high-speed high-order high-stability frequency hopping signal compared with the prior art.

The invention discloses a photoacoustic stimulated Raman gas detection system and method based on hollow-core optical fiber self-seed injection enhancement, and belongs to the technical field of laser spectrum trace gas detection, the system comprises a light source and beam splitting module, a hollow-core optical fiber seed generation module, a light delay module and a short optical path power amplification module; the main laser beam is split into a first light beam and strong pump light after entering the beam splitter; in the hollow-core optical fiber seed generation module, a first light beam passes through a fifth reflecting mirror, a hollow-core optical fiber seed generation unit, a sixth reflecting mirror and an optical filter, and weak seed light is output; the strong pump light is synchronized with the weak seed light output from the optical filter after entering the optical delay module; in the short-optical-path power amplification module, weak seed light and strong pump light output by the light delay module are combined at a dichroscope and are strictly coaxial, and then are focused by a convex lens and enter a short-optical-path Raman frequency shifter. According to the invention, the oscillation starting threshold of the Raman frequency shifter is greatly reduced by utilizing seed light-induced stimulated radiation.

The present invention relates to the field of semiconductor laser technology, specifically providing a tunable narrow-linewidth multi-wavelength laser based on injection locking. The laser comprises a light source, a beam splitter, a coupler, a photoacoustic frequency shifter, and a microring. The optical signal output by the light source is split into multiple sub-beams by the beam splitter. A photoacoustic frequency shifter and a microring are provided in the optical path of each sub-beam. The photoacoustic frequency shifter adjusts the frequency of the sub-beam, while the microring forms an injection-locked relationship with the light source, compressing the linewidth of the sub-beams. The sub-beams are then combined by a coupler, and finally a semiconductor optical amplifier is used for power amplification. By using the beam splitter, photoacoustic frequency shifter, and microring, the present invention enables a single light source system to output equally spaced multi-wavelength lasers, overcoming the drawbacks of traditional multi-light source designs.

This invention discloses a high-resolution ultrafast visible light dual-comb microscopy imaging device and method. The imaging device includes a dual-comb light source, a frequency shifter, a wavelength division multiplexer, a two-dimensional dispersive element, a microscopy imaging system, a dual-comb detector, and a data acquisition and processing section. A dual-comb is used as the light source. The two-dimensional dispersive element expands the optical frequency comb into a wavelength-space-coded lattice light field for illumination. A dual-comb detector performs dual-comb spectral measurements to obtain information contained in the wavelengths. The frequency shifter changes the optical frequency to achieve structured light illumination, thus realizing high-resolution ultrafast microscopy imaging. This invention overcomes the limitations of time-domain stretching in traditional ultrafast measurement techniques on visible light ultrafast microscopy imaging, effectively reducing the spot size of the illumination beam and improving the spatial resolution of the imaging. Utilizing an optical frequency comb to achieve label-free ultra-resolution microscopy imaging with lattice structured light illumination can further improve the resolution of ultrafast microscopy imaging.

The application provides a frequency-shifted double optical comb-based frequency-modulated continuous wave laser ranging device, which combines frequency-modulated continuous wave and double optical comb technology and comprises an FMCW light source, a beam splitter, a detection and reference light channel, a beam combiner, a photoelectric detector and a processing module. The FMCW light source outputs linear sweep laser, which is divided into two paths by the beam splitter, the detection light channel uses a first optical comb generator and a circulator to detect a target, and the reference light channel increases the frequency f FS by a frequency shifter and generates an optical comb with different comb tooth intervals by a second optical comb generator, wherein f FS and the repetition frequency difference Δf R are not integer multiples, thereby effectively avoiding interference. After the two paths of signals are combined by the beam combiner, the photoelectric detector converts the signals into beat signals, and the processing module splices the time domain signals by using the phase correlation, thereby improving the ranging accuracy. The frequency-shifted double optical comb technology improves the accuracy and anti-interference performance, and the efficient data processing algorithm ensures fast measurement and wide application range.

The application discloses a laser phase noise measuring device and method, comprising: a light source to be measured, a first optical coupler, a second optical coupler, an acousto-optic frequency shifter, a first single-mode optical fiber, a third optical coupler, a first polarization controller, a second single-mode optical fiber, a second polarization controller, a fourth optical coupler, a fifth optical coupler, a first balanced photodetector, a second balanced photodetector and a signal acquisition and processing unit. The technical scheme of the application overcomes the mutual restriction problem between sensitivity and bandwidth in the traditional delay interference method, and improves the sensitivity and bandwidth comprehensive performance of the laser phase noise measurement.

The invention belongs to the technical field of photoelectricity, and discloses a stepping frequency shift type pulse light generating device and method. Comprising a continuous wave laser (1), a first light beam combiner (2), a first light beam splitter (3), a second light beam splitter (4), a master frequency shifter (5), a first microwave signal source (6), a third light beam splitter (7), a slave frequency shifter (8), a second microwave signal source (9), a second light beam combiner (10), a third light beam combiner (11), a light amplifier (12), a light filter (13) and a light output port (14). The optical frequency comb has the capability of generating an optical frequency comb signal with a stepping change characteristic, the time domain and frequency domain characteristics of the signal have particularity, and the optical frequency comb can be used in the application fields of secret communication, laser target indication, test measurement and the like which need special signals as working media; the device has the capability of realizing on-chip integration, and the tuning precision and the working stability of the device are improved after the on-chip integration is completed.

The invention provides a spectrum testing method for electro-optical modulation signals. The device is composed of a laser, a microwave signal source, a to-be-measured electro-optical modulation signal generation module, an optical frequency shifter, an electro-optical phase modulator, a photoelectric detector and a spectrum analysis module, optical signals output by the laser are divided into two paths, the upper path is in optical connection with the to-be-measured electro-optical modulation signal generation module, and the lower path is in optical connection with the to-be-measured electro-optical modulation signal generation module. The lower path is sequentially and optically connected with the optical frequency shifter and the electro-optic phase modulator and is optically connected with the photoelectric detector after being combined, the microwave signal source is electrically connected with the radio frequency end of the electro-optic phase modulator, and the output end of the photoelectric detector is electrically connected with the spectrum analysis module. Heterodyne mixing signals f1-pf2 (p is a positive integer) of an electro-optical modulation spectrum signal f1 to be detected and an electro-optical phase modulation signal f2 are detected, mixing signal power ratios when output signal voltages of a microwave signal source are V2 and kV2 respectively are analyzed, the p value and the frequency f1 are determined by utilizing the Bessel function relation, meanwhile, the frequency response of a photoelectric detector is calibrated, and the frequency response of the photoelectric detector is calibrated. The relative amplitude of each order of light modulation sideband of the electro-optical modulation spectrum to be tested is obtained, and spectrum testing of the electro-optical modulation signal to be tested is achieved.

An acousto-optic modulator that includes a waveguide on an acoustic actuator is disclosed. The waveguide carries an optical signal having a UV or visible wavelength. When the acoustic actuator is activated, the optical signal in the waveguide is bathed in intense acoustic waves. By using a waveguide having the appropriate dimensions to strongly confine both the optical signal and the acoustic waves, strong optomechanical coupling may be achieved between the optical and acoustic modes, resulting in an efficient modulator. By employing either intra-modal or inter-modal conversion, the modulator may be used to implement a variety of dual- or single-sideband functions, including an isolator, a phase modulator, a single-sideband frequency shifter, or a high-extinction shutter.

The application relates to a dynamic performance calibration device and method of a heterodyne laser interferometer signal processing link based on an acousto-optic frequency shifter, and belongs to the technical field of dynamic measurement performance calibration of a heterodyne laser interferometer. The calibration method of the existing heterodyne laser interferometer couples Abbe error, cosine error and data period error caused by non-synchronous measurement due to mechanical installation, and brings the problem that the dynamic measurement performance of the signal processing link of the interferometer is difficult to evaluate. The calibration device comprises a laser assembly, a first measurement light path, a second measurement light path, an AOFS drive and motor controller light path and a phase meter; the laser assembly emits laser into a beam splitter prism assembly, the beam splitter prism assembly divides the incident light into two beams of laser which are respectively injected into the first measurement light path and the second measurement light path, and finally sent to the phase meter to calculate the phase difference. The application is suitable for the equivalent calibration device of the dynamic measurement performance of the signal processing link of the heterodyne laser interferometer under target high-speed motion.

The invention discloses a phase characteristic measuring device of a photoelectric balance detection system, which can be applied to the field of signal processing and comprises a narrow linewidth laser for outputting an optical signal and outputting an upper optical signal and a lower optical signal from the optical signal through a beam splitter, a phase modulator for receiving the optical signal of the upper branch and generating a double-sideband modulation signal, the acousto-optic frequency shifter is used for receiving optical signals of a lower branch, carrying out optical carrier frequency shift and generating optical carrier frequency shift signals, the beam combiner is used for carrying out interference on the double-sideband modulation signals and the optical carrier frequency shift signals and inputting the signals to the photoelectric balance detection system, and the processor is used for obtaining sampling interference waveform data of the photoelectric balance detection system. And performing spectral analysis to obtain phase information at a preset frequency point. In this way, the modulated optical signal completely passes through the signal receiving chain of the photoelectric balance detection system, measurement errors caused by cascade matching of all assemblies are avoided, disassembly testing of each assembly is not needed, and therefore the complexity of phase characteristic measurement of the whole system is reduced.

The application relates to the technical field of electro-optical frequency comb generation, and discloses a super-narrow-line-width, wide-band, flexible-repetition-frequency and adjustable electro-optical comb generation system and method, which comprises a pump laser generation branch, a fiber ring cavity, and a frequency shift injection locking branch.The pump laser generation branch comprises a distributed feedback laser, a first polarization controller and a first circulator; the fiber ring cavity comprises a second circulator, a Brillouin gain fiber, a fiber delay line, a fiber coupler, a second polarization controller, an electro-optical modulator, a dispersion compensation fiber, an optical amplifier, a flat filter and an isolator; and the frequency shift injection locking branch comprises a narrow-bandwidth filter, a polarization controller and a frequency shifter.The electro-optical frequency comb generation device of the application has a novel structure, realizes super-narrow-line-width, wide-band, flexible-repetition-frequency and adjustable electro-optical comb output, solves the limitations of narrow bandwidth and wide comb line width of a traditional electro-optical frequency comb generated based on electro-optical modulation, and does not need complex active optoelectronic feedback to maintain stable operation of the system.

The invention relates to a pure Rayleigh scattering signal acquisition method and system based on a laser source. The method comprises the following steps: performing beam splitting treatment on femtosecond pulses output by a laser source to obtain at least two beams of femtosecond pulses; inputting the first beam of femtosecond pulse into a nonlinear crystal for frequency mixing processing to obtain a preprocessed scattering signal; performing frequency shift processing on the second beam of femtosecond pulse by using an acousto-optic frequency shifter or performing phase lock processing on the second beam of femtosecond pulse by using an optical phase lock ring to obtain a coherent local oscillator signal; inputting the preprocessed scattering signal and the coherent local oscillator signal into a frequency mixer for interference processing to obtain a mixed difference frequency signal; and performing multi-stage signal processing on the mixed difference frequency signal by using a signal processor to obtain a target Rayleigh scattering signal. According to the invention, the Rayleigh scattering signal acquisition accuracy can be improved.

This invention discloses a photoacoustic stimulated Raman gas detection system and method based on hollow-core optical fiber seed injection enhancement, belonging to the field of laser spectroscopy trace gas detection technology. The system includes a light source and beam splitting module, a hollow-core optical fiber seed generation module, an optical delay module, and a short-path power amplification module. The main laser beam is incident on a beam splitter and splits into a first beam and a strong pump beam. In the hollow-core optical fiber seed generation module, the first beam is reflected by a fifth mirror, a hollow-core optical fiber seed generation unit, a sixth mirror, and a filter, outputting a weak seed beam. The strong pump beam enters the optical delay module and synchronizes with the weak seed beam output from the filter. In the short-path power amplification module, the weak seed beam and the strong pump beam output from the optical delay module are combined and strictly coaxial at a dichroic mirror, then focused by a convex lens and enter the short-path Raman frequency shifter. This invention achieves a significant reduction in the oscillation threshold of the Raman frequency shifter by utilizing seed light-induced stimulated emission.

The invention discloses a communication and remote sensing integrated forest fire prevention laser radar system and a use method thereof. The laser radar comprises a continuous light laser, a beam splitter, an analog signal generator, an electro-optical modulator, a pulse optical fiber amplifier, a circulator, a variable-focus transceiver telescope, a coupler, an acousto-optic frequency shifter, a balance detector, a receiving telescope, an avalanche diode detector, a multi-channel data acquisition system and a computer. According to the invention, the electro-optical modulator is adopted to modulate a high-frequency pulse signal, and an atmospheric detection signal and a communication signal can be generated; signal frequency shift is realized by adopting an acousto-optic frequency shifter, and wind field direction information is obtained; a variable-focus transceiving telescope, a receiving telescope and laser radars are adopted for networking, and optical information transmission between the laser radars is achieved. The system can realize information communication of the laser radar in a non-signal area, and is especially suitable for being applied to the field of forest fire prevention based on the advantages of multi-parameter detection, high resolution and wide coverage of the laser radar.

Disclosed is a transmit-receive coaxial phased array LiDAR chip and a control method. The transmit-receive coaxial phased array LiDAR chip includes a laser transmitter unit, a main beam splitter, a transmit-receive phased array, a balanced detector array, and a signal processing and control unit. Phase modulation is performed on optical signals, and the optical signals are split into reference light and signal light. The signal light is radiated into a free space. The reference light passes through a frequency shifter and is input into a 90-degree optical mixer with an echo signal to generate a beat signal. The balanced detector array receives the beat signal, converts the beat signal into an electrical signal, and transmits the electrical signal to the signal processing and control unit. The signal processing and control unit calculates three-dimensional depth information and / or velocity information of a target region based on the electrical signal.

The present invention relates to the technical field of semiconductor lasers and specifically provides a tunable narrow-linewidth multi-wavelength laser. The laser comprises: a laser, a microring, a 1×N-port optical splitter, a photoacoustic frequency shifter, an N×1-port coupler, and a semiconductor optical amplifier, all integrated on a waveguide layer of a chip. The laser and the microring form a stable injection-locked relationship, stabilizing the frequency of the laser output light near the resonant frequency of the microring. The optical signal is then split into multiple beams by the optical splitter, and each beam is frequency-modulated by the photoacoustic frequency shifter to achieve equally spaced multi-wavelength output. The beams are then combined by a coupler, and the optical signal is amplified by a semiconductor optical amplifier to achieve multi-wavelength output with narrow linewidth and adjustable wavelength intervals. Furthermore, the various components of the present invention are integrated on the same chip, avoiding the drawbacks of traditional solutions with multiple independent lasers, such as difficulty in controlling wavelength intervals and narrowing linewidths, as well as large system volume and complex structure.

This invention discloses a laser linewidth measurement device and method based on switchable channel delay self-heterodyne interferometry, belonging to the field of laser linewidth measurement technology. The laser to be measured is incident on a first fiber coupler via an isolator and splits into two paths: one path enters a computer-controlled first and second optical switches via a three-port fiber circulator, switching between different lengths of delay fiber via the first and second optical switches, rotating the polarization state by 90° via a Faraday rotating mirror before returning along the original path, and then restoring the original polarization state via a polarization controller; the other path undergoes frequency shifting via an acousto-optic frequency shifter. The two paths are combined via a second fiber coupler to generate a beat frequency optical signal, which is then acquired by a photodetector for photoelectric conversion and a spectrum analysis module. The computer fits the beat frequency power spectrum corresponding to different delay lengths to obtain the laser linewidth to be measured. This invention has strong anti-interference capabilities and can simultaneously acquire Lorentz linewidth, Gaussian linewidth, and composite linewidth, with a wide linewidth measurement range.

The invention refers to a frequency shifter for heterodyne interferometry measurements, comprising a chip, an input waveguide configured to guide a light beam, at least four phase modulators, each being arranged to receive the light beam from the input waveguide and configured to modulate a phase of the light beam, an output combiner being arranged to let the light beams modulated by each phase modulator interfere, a first output waveguide coupled to the output combiner and configured to receive the modulated light beams constructively interfering at the output combiner, a second output waveguide coupled to the output combiner and configured to receive the modulated light beams destructively interfering at the output combiner, wherein the input waveguide, the phase modulators, the output combiner, the first output waveguide and the second output waveguide are arranged on the chip.

The invention relates to a radar target simulator, a corresponding antenna array and a radar target simulation method. The radar target simulator comprises: a primary target generator configured to create at least a portion of a radar scene, in particular a radar scene, and / or at least one primary radar target; and a secondary target generator configured to create at least one secondary radar target. In this case, the secondary target generator includes a receive path, a Doppler shifter, a delayer or delay structure, and a transmit path.

The present application relates to a rotational speed detection device based on self-feedback rotating Doppler effect. Its main components include microchip laser, lens, light splitting prism, photodetector, acousto-optic frequency shifter, polarizer, quarter wave plate, vortex plate. The laser generated by the microchip laser is expanded by the lens and then split into two beams by the light splitting prism. The reflected beam irradiates on the photodetector, and the transmitted beam is frequency shifted twice by the acousto-optic frequency shifter to generate a frequency shift Δf smaller than the relaxation oscillation frequency of the microchip laser. Then, the polarization state of the beam is controlled by the polarizer and the quarter wave plate, and then transmitted through the vortex plate to become vortex light. After passing through another linear polarizer, the polarization state of the vortex beam can be further modulated. Finally, the vortex light irradiates on the surface of the rotating object to generate a rotating Doppler shift f mod , and the scattered light returns to the microchip laser cavity again. After amplification in the laser cavity, the photodetector can detect the size of the rotating Doppler shift, thereby realizing the measurement of the rotational motion information of the target. The device has the outstanding advantages of compact structure and high sensitivity.

The utility model discloses a wind measurement radar device based on a silicon-based photoelectronic technology, and relates to the field of laser wind measurement. The wind measurement radar device comprises a receiving and transmitting integrated module based on the silicon-based photoelectronic technology, an acousto-optic frequency shifter, an optical amplifier, a circulator, a wavelength division multiplexer and an optical antenna, wherein the acousto-optic frequency shifter is connected between the receiving and transmitting integrated module and the optical amplifier; the optical amplifier is connected to the circulator, the circulator is in dual-phase connection with the wavelength division multiplexer, the circulator is connected to the optical transceiving integrated module, and the optical transceiving integrated module comprises an adjustable narrow linewidth laser based on the silicon-based photoelectron technology, a balance detector, a frequency mixer, an optical splitter, an optical fiber array, a sealing tube and the like. According to the utility model, the tunable narrow linewidth laser adopting the silicon optical external cavity scheme is matched with the pure solid state scheme of the wavelength division multiplexer, so that the process of switching an optical antenna by using an optical switch in the measurement process is directly avoided; line width performance indexes of the laser can be far better than that of a traditional adjustable laser of an InP-based platform through design and process optimization.