66 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 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.

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.

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 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 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.

The present invention discloses a three-frequency laser generating device and method for a fiber-optic rapid sodium temperature and wind laser radar, belonging to the technical field of multi-frequency laser generating methods. The laser is input through a first fiber coupler, and the horizontally polarized light after passing through the polarization beam splitter cube enters one of the three-frequency optical paths after passing through a quarter-wave plate. After passing through the acousto-optic frequency shifter of the corresponding optical path, it is reflected by the corresponding optical path reflector. The reflected light then passes through the acousto-optic frequency shifter, the quarter-wave plate, and the polarization beam splitter cube of the corresponding optical path in sequence, and then is coupled into the second fiber coupler for output. Among them, by controlling the first acousto-optic frequency shifter, the second acousto-optic frequency shifter, the third acousto-optic frequency shifter, and the fourth acousto-optic frequency shifter to shift the frequency or not, the optical path where the laser enters and the frequency of the output laser are controlled. The present invention has the characteristics of high laser frequency purity and high suppression ratio. The three-frequency optical paths can be independently optimized, adjusted, and fixed by three reflectors without crosstalk.

An optical device having a frequency shifter, the frequency shifter having an optical component having a phase modulator having a silicon material substrate, a buried oxide layer disposed on the silicon material substrate, a silicon waveguide disposed on the buried oxide layer, wherein the silicon waveguide is configured to guide a light, and a pair of electrodes disposed on the silicon waveguide, wherein the phase modulator is configured to change the phase of the light passing through it, and an electronic drive circuit in electrical communication with the phase modulator such that the phase change is linearly proportional to time. The disclosed optical device is configured to provide optical frequency shifting capabilities to and be integrated within silicon photonics-based devices, wherein the disclosed optical device is configured to facilitate this frequency shifting capability while being compact and having a low cost.

The utility model discloses a heterodyne Doppler laser vibration meter based on all optical fibers. The vibration meter adopts a double-light-path differential design, and the system divides laser into a measuring light beam and a reference light beam which are respectively guided into a measuring light path and a reference light path which are parallel to each other. The measuring light path emits laser to an object to be measured, and a return signal of the laser comprises composite information of object vibration and system errors after being demodulated. Meanwhile, a reference light path forms a closed loop inside, and a demodulation signal of the reference light path can accurately extract system errors introduced by devices such as a frequency shifter. The signal processing system subtracts the two demodulated signals in real time, so that homologous errors are eliminated, and pure and real vibration data are obtained. According to the utility model, a complex phase-locked loop is replaced by front-end optical path difference, so that the measurement precision, stability and environmental adaptability are remarkably improved.

The application belongs to the technical field of optical fiber measurement, and particularly relates to an optical frequency domain polarimeter of polarization beam splitting structure frequency shift detection with ultra-high sensitivity, which comprises a tunable laser source module, a device to be measured module, a polarization beam splitting frequency shift interferometer module, an auxiliary interferometer module and a signal acquisition and analysis module, and is characterized in that: a frequency shifter contained in the polarization beam splitting frequency shift interferometer module is used to move the signal to a high frequency, thereby avoiding the noise aliasing problem from a low frequency; a polarization beam splitter is used to separate the transmission mode and the coupling mode light passing through the device to be measured to suppress the main interference peak, thereby improving the sensitivity to-130 dB, and greatly improving the speed and sensitivity of the polarization crosstalk measurement in principle. Meanwhile, the main extended optical fiber and the acousto-optic modulator are combined to shift the signal, thereby meeting the acquisition of the polarization crosstalk information when the long-distance device is tested.

The application discloses a kind of narrow line width fiber laser systems based on active phase compensation of fiber loop interferometer frequency stabilization, comprising: fiber laser, the laser is sequentially connected with first frequency shifter, Y type coupler, X type coupler and photoelectric detector by conducting optical fiber and constitutes loop interferometer loop.The photoelectric detector is connected with radio frequency power divider, and also be used to convert beat frequency optical signal output by fiber loop interference loop into radio frequency electric signal;The output end of the radio frequency power divider is respectively connected with first feedback calibration loop and second feedback calibration loop, to carry out the fast feedback calibration of laser frequency by first feedback calibration loop, and carry out the active compensation of delay optical fiber phase noise by second feedback calibration loop.And by second proportional integral amplifier for slow feedback calibration of laser frequency.The interferometer frequency stabilization system presented in the application has high detection sensitivity and large bandwidth, and has lower environmental sensitivity.

The application discloses a kind of spatial filtering type differential resonance photoacoustic stimulated raman detection systems and methods, belong to gas detection technical field, the system includes laser source module, raman frequency shifter module, spatial filtering type differential resonance photoacoustic cell and signal acquisition and processing unit;High-energy pulsed laser generated by laser source module is shot into raman frequency shifter module after collimation;The double-color coherent light beams output by raman frequency shifter module are focused after achromatic lens, and are coaxially shot into the center of spatial filtering type differential resonance photoacoustic cell, and the photoacoustic signals excited are collected by two microphones of spatial filtering type differential resonance photoacoustic cell;Signal acquisition and processing unit is electrically connected each microphone;Two acoustic tubes of spatial filtering type differential resonance photoacoustic cell are symmetrically arranged in the inside of large tube buffer cavity, and two Brewster windows are respectively sealed and installed at the two ends of large tube buffer cavity.The application can effectively inhibit window optical damage, improve system stability.

A measurement device includes a splitter splitting light from a light source into first and second lights; an optical frequency shifter shifting a frequency of the first light; a first optical modulator modulating intensity of the first light and generating probe light having two frequency components; a second optical modulator generating pump light by pulsing the second light; an optical detector detecting, when the probe light is incident from a first end of an optical fiber to be measured and the pump light is incident from a second side of the optical fiber, light emitted from the second side of the optical fiber; and a processor measuring, based on detected light intensity, temperature or distortion of the optical fiber, in which a frequency of a lower one of the two frequency components yields Brillouin gain, and a frequency of a higher frequency component yields Brillouin loss.

The application discloses a high-sensitivity vibration sensing system and method using a broadband light source, wherein after broadband light passes through a fiber grating, the spectrum width of the light source is compressed, the coherence length is controlled, and two beams of light with an optical path difference within a specific range interfere, so that the noise of the sensing system can be significantly reduced; a heterodyne modulation and demodulation method is adopted, a fiber delay module and an acousto-optic frequency shifter are introduced into a reference path, the fiber length is compensated by controlling the cavity length, the high-order reflected detection light in the fiber Fabry-Perot resonant cavity interferes with the first-order reflected reference light, and the effect of improving the sensitivity is achieved. The application utilizes the advantages of the spectrum width of the broadband light source and the wavelength characteristics of the fiber grating, and realizes the dynamic signal modulation and demodulation of the broadband light source heterodyne interference with the advantages of reusability, high sensitivity and low cost.

The application discloses a full-fiber unmodulated frequency discriminator with long absorption spectrum, which is used for obtaining an error electric signal capable of indicating the relative central frequency deviation of the current output frequency of a laser, and can be applied to a laser frequency stabilization system. The frequency discriminator is based on the gas chamber absorption spectrum difference principle, and comprises a laser to be stabilized, a frequency shifter, a gas chamber, a balanced detector and a transmission optical fiber. The frequency discriminator realizes double gas absorption spectrum while saving cost and reducing the system volume through the internal optical structure design. The frequency discriminator has simple structure and is easy to integrate. The process of obtaining the error electric signal does not need modulation and demodulation, and high frequency discrimination sensitivity is realized through long absorption spectrum.

The present disclosure relates to a system and method of providing multiple bandwidth support by incorporating one additional frequency shifter in a Field Programmable Gate Array (FPGA) platform while re-using available base band design with single Fast Fourier Transform (FFT) size. This method facilitates to save FPGA resources and provides additional sampling in lower bandwidth configurations leading to common sampling rate for all bandwidths which further simplifies an end-to-end design. Further, the method discloses an efficient way of implementing a frequency shifter in the FPGA platform.