912 results about "Tunable laser" patented technology

The invention discloses a bone joint lesion area automatic labeling method and system based on image processing, and belongs to the field of bone joint lesion area labeling. According to the invention, a bone joint reflection signal is obtained by combining the polarization-state-adjustable laser light source with polarization-sensitive optical coherence tomography, and a three-dimensional birefringence distribution diagram is generated through matrix analysis. And after non-local mean filtering is carried out on the distribution map, a lesion edge contour is extracted based on a dynamic gradient amplitude, and a binary mask is generated. Mask pixels are converted into network nodes containing space coordinates, gradient directions and birefringence, and a topological network is constructed based on the Euclidean distance of adjacent pixels. The weight is calculated through the node intersection density and the birefringence, and a graph attention network is utilized to aggregate multi-layer features to extract lesion topological features. The features are mapped to a three-dimensional space to construct a lesion probability distribution field, an interactive labeling result is generated through contour surface extraction and transparency mixed rendering, and the accuracy of labeling the complex lesion area of the bone joint can be improved.

The invention provides an OFDR sensing system and method for rapidly positioning strain based on a time domain difference algorithm, and relates to the technical field of optical fiber sensing. The OFDR sensing system comprises a narrow linewidth tunable laser light source, a first optical fiber coupler, a main interferometer, an auxiliary interferometer and a data acquisition and signal processing module; laser emitted by the narrow linewidth tunable laser light source is divided into two paths through the first optical fiber coupler, one path of light enters the main interferometer, and the other path of light enters the auxiliary interferometer; the main interferometer and the auxiliary interferometer respectively output a main interferometer optical signal and an auxiliary interferometer optical signal to the data acquisition and signal processing module; the data acquisition and signal processing module is used for performing nonlinear compensation on the optical signal of the main interferometer by using the optical signal of the auxiliary interferometer, and performing cross-correlation operation on a reference optical signal of the main interferometer and a measurement optical signal of the main interferometer which are based on the strain-free state and the strain state of the sensing optical fiber and are subjected to nonlinear compensation; and obtaining the strain position and the strain value of the sensing optical fiber.

In one embodiment, a system includes a first light source configured to produce a first beam of light at a first frequency and a second light source configured to produce a second beam of light at a second frequency, where the first and second frequencies are offset by a frequency offset Ω. The system also includes one or more optical elements configured to: direct the first and second beams of light to a sample, and collect a Raman signal produced by the sample in response to the first and second beams of light. The system further includes an optical receiver configured to detect the Raman signal. The optical receiver includes a third light source configured to produce a third beam of light at a third frequency, where the third light source includes a wavelength-tunable laser, where the third frequency is adjustable.

The invention discloses a wavelength-tunable electro-absorption modulated laser and a preparation method thereof. The laser comprises a substrate, and a first modulator region, a first gain region, a grating region, a second gain region and a second modulator region which are sequentially arranged on the substrate and are positioned on the same plane, phosphorus ions are doped in constituent materials of the first modulator region and the second modulator region. The first gain region and the second gain region are used for exciting laser with various wavelengths under the action of different direct currents; the grating area is used for carrying out mode selection on the various wavelengths; the first modulator area and the second modulator area serve as light emitting ends to emit tunable laser, and double-end laser emission is achieved. The two electro-absorption modulators and the wavelength tunable laser are integrated back to back, a wavelength tuning area is shared, and bandwidth doubling is achieved. Through epitaxial growth of one-time active material and one-time passive material, integration of three forbidden bandwidth materials is realized, the manufacturing process is simplified, and the performance of the device is improved.

The present invention belongs to the field of optical fiber measurement technology, and specifically relates to an optical fiber distributed polarization crosstalk fast measurement device based on optical frequency domain interference. The device comprises a tunable laser source module (1), a device to be measured module (2), an auxiliary interferometer module (3) and a signal acquisition and analysis module (4), and is characterized in that: a high-coherence tunable laser is used to perform fast wavelength scanning on an optical signal, and a linear frequency modulated continuous light (501) is output, which passes through a polarizer (202), a device to be measured (206) and an analyzer (210) in sequence, and a beat frequency signal generated by the interference of a coupling light (704) and a transmission light (701) is obtained in the optical frequency domain, and then an optical path difference and a normalized interference signal amplitude are calculated, thereby respectively determining the polarization crosstalk position and intensity. The present invention, in combination with a tunable laser, gets rid of the dependence on an optical path scanning delay device in polarization crosstalk measurement, greatly improves the speed and dynamic range of polarization crosstalk measurement, and has a compact structure, is stable and reliable, and is easy to implement.

The invention relates to the field of optical detection, in particular to a spectrum confocal displacement measuring system and method based on wavelength modulation, and the measuring system comprises a tunable laser, a dichroscope, a dispersion lens, a pinhole, a photodiode and a modulator. The tunable laser is used for outputting laser; the modulator is used for calculating a wavelength modulation function of the tunable laser according to a nonlinear relationship between the wavelength of the dispersion lens and the axial focusing position, and performing nonlinear modulation on the output wavelength of the tunable laser through the wavelength modulation function; the change rate of the output wavelength of the tunable laser adapts to the axial resolution of the dispersion lens; the dichroscope is used for reflecting and transmitting the light beam; the dispersion lens is used for dispersing the light beam and focusing the light beam to different positions of the sample; the photodiode is used for receiving each beam of reflected light reflected by the sample and converting an optical signal into an electric signal; the pinhole is used for suppressing defocused light. According to the invention, the measurement precision and the stability of measurement results can be improved.

The invention relates to the technical field of gas detection, in particular to a dual-wavelength-based adaptive methane detection method and system, and the method comprises the following steps: collecting environmental interference characteristics of a to-be-detected gas environment in real time; synchronously emitting a first laser beam and a second laser beam to a to-be-detected gas environment according to the tunable laser source; receiving optical signals of the first laser beam and the second laser beam and converting the optical signals into electric signals; calculating a light intensity difference value of the first laser beam and the second laser beam based on the electric signal to generate a differential absorption signal; performing optical differential compensation on the differential absorption signal, outputting a methane concentration value, and performing environmental drift compensation on the methane concentration value based on environmental interference characteristics; and performing real-time threshold value judgment on the methane concentration value, and if the methane concentration value exceeds a preset threshold value, triggering a local early warning signal. According to the invention, the problem that the detection precision is reduced due to the fact that methane absorption signal common-mode noise and absorption coefficient drift cannot be synchronously inhibited due to dust concentration and temperature and humidity interference in a dynamic complex environment under a mine is effectively solved.

The invention discloses a method for detecting the strain of a key part of a wind turbine generator based on a temperature compensation OFDR demodulation weak fiber bragg grating array, and relates to the technical field of wind turbine generator detection, and the method comprises the steps: installing a weak fiber bragg grating sensor array at the key strain part according to the structural characteristics of the wind turbine generator, a temperature reference grating is arranged in the non-strain area or the constant-temperature area so as to monitor the temperature change in real time; a tunable laser, an optical fiber coupler and a photoelectric detector are utilized to construct an optical frequency domain reflection demodulation system, and system calibration is completed; based on an optical frequency domain reflection demodulation system, reflection spectrum signals are collected, the relation between wind turbine generator strain and temperature change is analyzed through a temperature compensation mechanism, and strain information of key parts of the wind turbine generator is obtained. According to the method, the accuracy and reliability of strain detection are effectively improved, and the problem of measurement errors caused by neglecting the influence of temperature change in a traditional method is solved.

The invention discloses a wavelength and power adaptive compensation method and system for a DBR tunable laser, and relates to the technical field of tunable semiconductor lasers, and the method comprises the steps: controlling the operation of a laser through a constant current source, and collecting the wavelength and output power of the laser; performing signal processing on the wavelength and the output power; carrying out limiting processing on the wavelength accuracy and the power reference point of the laser; and adaptively compensating the output power and the wavelength of the laser based on the limiting processing. The problem of wavelength and power cross influence caused by inner loop feedback is solved, the structure is simple, output signals of the two monitoring units can be processed at the same time, and implementation is easy; a fuzzy PID control algorithm is adopted to monitor and stabilize power based on the power monitoring loop, a wavelength calibration algorithm is designed based on the wavelength monitoring loop to monitor and stabilize wavelength, and high-precision synchronous stabilization of the wavelength and the power of the laser is achieved.

The invention discloses an optical test system and method for measuring the total temperature of a supersonic combustion flow field, and relates to the field of combustion flow field measurement. The system comprises supersonic combustion incoming flow, a time sequence synchronizer, a first laser, a first focusing lens, a first total reflection plane mirror, a second laser, a second focusing lens, a sheet light lens, a second total reflection plane mirror, a computer, an ICCD, a tunable laser diode, a laser controller, a photoelectric detector, an industrial personal computer and a signal monitor. On the basis of a non-contact optical testing technology, the local total temperature is obtained by measuring the speed and the static temperature of the combustion flow field at the same time on the premise that the flow structure and the combustion state of the combustion flow field are not damaged, the structure of the supersonic combustion flow field is not obviously affected, unnecessary oblique shock waves are not caused, and the measurement accuracy is high. And the local and downstream flow and combustion states of the tested combustion flow field are not influenced.

The invention discloses an external cavity tunable laser linewidth compression system for realizing wavelength phase locking based on mutual injection of gain chips. The external cavity tunable laser linewidth compression system comprises a red light semiconductor laser main gain chip, a first collimation optical system, a blazed grating, a tuning rotating mirror, a reflector, a power supply driving system and a double-path feedback amplification system, the double-path feedback amplification system comprises a first secondary gain chip, a second secondary gain chip, a second collimation optical system, a third collimation optical system and a polarization-free beam splitter prism; and the red light semiconductor laser main gain chip, the first secondary gain chip and the second secondary gain chip are all connected with the power supply driving system. Therefore, the technical problems of low output infrared light power, poor stability and narrow mode-hopping-free tuning range in the prior art are solved, and high-power, narrow-linewidth, high-stability and large-range mode-hopping-free continuous tuning red light output can be realized.

The invention provides a tunable laser source output wavelength adjusting device and method, and the method comprises the steps: starting a tunable laser source, carrying out the preheating, and resetting a motor motion unit; acquiring an initial light-emitting wavelength based on a pre-stored relation curve between the light-emitting wavelength of the laser source and the position of the motor; controlling the output wavelength of the laser source through the coarse tuning parameter of the motor motion unit, traversing the tunable output range of the tunable laser source, and collecting the wavelength position of the reflection peak value of the fiber bragg grating and the corresponding optical power value; according to the reflection peak wavelength position, through voltage regulation and control of stacked piezoelectric ceramics, step scanning is carried out according to a target wavelength, and a laser source output wavelength is dynamically adjusted to obtain a fine scanning wavelength; and judging whether the deviation between the fine scanning wavelength and the target wavelength meets the preset precision or not, if so, locking the output wavelength, otherwise, repeatedly regulating and controlling until the conditions are met. According to the invention, traditional current-wavelength dependence is broken through, and wavelength demodulation is realized through electromechanical collaborative calibration and two-stage scanning.

The invention provides a fiber optic spectrometer and a spectrum detection method, and belongs to the technical field of spectrum detection. The optical fiber spectrometer comprises an optical splitter and a detector, wherein the optical splitter comprises a multimode optical fiber and a diffraction grating which is formed by writing on the end face of the emergent end of the multimode optical fiber and is arranged opposite to the light sensing surface of the detector. The spectrum detection method comprises the following steps: calibrating a fiber optic spectrometer by using a tunable laser to obtain an initial transmission matrix for representing response characteristics of the fiber optic spectrometer under different wavelengths; correcting the initial transmission matrix by adopting a singular value decomposition algorithm to obtain a final transmission matrix; measuring a to-be-measured light source by using a fiber optic spectrometer to obtain a to-be-measured diffraction image; and reconstructing the spectrum of the to-be-measured light source according to the to-be-measured diffraction image and the final transmission matrix. According to the invention, the diffraction image of the light source to be detected is measured by means of the optical fiber spectrometer with a simple structure, and the spectrum of the light source to be detected can be rapidly and reliably detected in combination with the transmission matrix obtained by calibrating the optical fiber spectrometer.

A device for measuring bending of extended vertically directed channels, including nuclear reactor fuel channels of the high-power channel-type reactor (HPCR). The device comprises a flexible hollow carrier rod having at least one fibre-optic sensor equipped with a core closed by a sealed tubular casing. The upper part of the core comprises a mounting sleeve with a central cylindrical cavity. The lower part of the core is comprises a central cylindrical rod. Longitudinal sector cuts are made on the rod of the core, in which ferrules with longitudinal through channels are fixed, and a gravity pendulum is placed under the lower end of the rod. Through the through channels of the ferrules, fiber-optic lines are drawn, connecting each fibre-optic sensor with a tunable laser and a photoreceiver connected to a computer. The cavity of the sealed tubular casing of the fibre-optic sensor is filled with an inert gas.

A tunable laser assembly housed in a single enclosure and a method of control is described wherein the tunable laser, pump and semiconductor optical amplifier do not share a common optical axis but are all aligned to optical waveguides on an intervening planar lightwave circuit (PLC). Wavelength monitoring circuitry is included on the PLC to enable monitoring and control of the tunable laser center wavelength and optical bandwidth. The design of the PLC does not introduce perturbations into the swept-source laser output spectrum that would cause artifacts in imaging applications such as optical coherence tomography (OCT).

The invention relates to the technical field of optical fiber sensing, in particular to an MOMES and FBG fusion sensing system based on a tunable laser array. A multi-wavelength tunable laser array light source is adopted to generate fast broadband frequency sweep laser, the fast broadband frequency sweep laser is split to M paths to be output through a multi-path planar optical waveguide shunt coupler, each path of output end is connected with N FBG sensor arrays and one MOMES sensor, and sensing signal reflected light is received by a corresponding photoelectric detector. After data processing is carried out through a photoelectric converter, a logarithmic amplifier, an analog-to-digital converter and an FPGA compatible algorithm platform, wave crests and wave troughs of reflection spectrum data of each wavelength point are searched at the same time; the wave crest data is used for demodulating the FBG sensor array, and the wave trough data is used for demodulating the MOMES sensor. According to the optical path structure and algorithm design of the system, synchronous demodulation of the FBG and the MOMES sensor is realized, and the compatibility and operation efficiency of the system are remarkably improved.

The invention discloses an acousto-optic combined detection and fusion positioning method and device for underground gas leakage, and belongs to the technical field of industrial safety monitoring. In order to solve the problems of high false alarm rate, insufficient positioning precision, poor dynamic environment adaptability and the like of a single sensor in the prior art, the invention provides a multi-modal signal space-time collaborative fusion technical scheme which specifically comprises an acousto-optic heterogeneous sensor, an integrated MEMS ultrasonic array and a tunable laser spectrum module. Microsecond-level synchronous acquisition of acousto-optic signals is realized through a GPS taming clock, and a cross-correlation time delay compensation model is designed to eliminate space-time mismatch errors. And designing a three-stage dynamic fusion framework: improving LMS adaptive filtering to suppress industrial noise, establishing a light intensity attenuation model in combination with dust environment concentration, carrying out multi-modal feature extraction of acousto-optic signals, carrying out signal preliminary fusion, and judging a gas leakage condition. And constructing an acousto-optic Bayesian joint probability model, and calculating the leakage posterior probability. And optimizing positioning parameters based on a double-Kalman filter group, predicting sound wave time delay by forward filtering, and correcting a light diffusion coefficient by backward filtering to realize three-dimensional coordinate solution. Temperature, humidity and dust concentration parameters are fused in real time, a sound velocity calculation model and a light intensity attenuation factor are corrected, and the robustness of complex working conditions is improved. According to the invention, the advantages of acousto-optic signals are combined, errors of various complex environmental factors are further fused and compensated, the overall error is greatly reduced, and the method has the characteristic of dynamic adaptation, and is very suitable for gas leakage detection and positioning in complex environments such as underground environments and the like.

The invention discloses a non-contact drunk driving detection method and system adopting a large-linewidth tunable laser, and relates to the technical field of laser detection, and the method comprises the steps: collecting transmission light signals and corresponding electric signals under different linewidth conditions through experiments, synchronously recording experiment parameters, obtaining an original data set, carrying out the preprocessing of the original data set, and carrying out the detection of drunk driving. Generating a training set, a verification set and a test set, and training a BP (Back Propagation) neural network to obtain a pre-trained noise suppression model; the method comprises the following steps of: generating a wavelength-tunable modulated laser beam by adopting a large-linewidth tunable laser, directionally projecting the modulated laser beam into a vehicle cab, and enabling laser to penetrate through the cab space and carry alcohol gas concentration information to obtain a transmission light signal; focusing the transmission light signal to a photoelectric detector through an optical convergence device to obtain a noisy electric signal, inputting the noisy electric signal into a pre-trained noise suppression model, and outputting a de-noised electric signal; performing synchronous demodulation and harmonic analysis on the de-noised electric signal by using a phase-locked amplification detection technology, extracting a second harmonic signal amplitude associated with the modulation frequency, and determining a second harmonic signal characteristic amplitude through peak detection; according to the calibration relation between the second harmonic signal characteristic amplitude and the alcohol gas concentration, the concentration value of the alcohol gas in the cab is calculated in an inversion mode through a least square fitting algorithm, an alcohol concentration threshold value is set, the drunk driving condition of a driver is judged, a detection result is generated, and an alarm signal is output.

The invention discloses a preparation method and a structure of a photonic integrated device, and the method comprises the steps: sequentially dividing a substrate into a front modulator region, a rear modulator region, a front grating region, a gain region and a rear grating region, and growing a first active layer after manufacturing a selected region epitaxial mask pattern in the gain region, the method comprises the following steps of: growing a first active layer in a front modulator region after mask etching operation, growing a second active layer in a front modulator region after mask etching operation, growing a third active layer in a grating region after mask etching operation, finally performing grating manufacturing, and completing manufacturing of a cladding layer, an electric contact layer, an inverted table shallow ridge waveguide structure, an electric isolation trench and an electrode. According to the method, integration of multiple materials is achieved through one-time selective area epitaxial growth and one-time butt joint growth, the material growth frequency is reduced, and the manufacturing cost is saved; the gain region and the rear modulator region realize forbidden band width offset through selective region epitaxial material growth, and multi-wavelength tuning and efficient modulation are realized through fluorescence wavelength difference design of each region, so that a solution can be provided for integration of a wide-wavelength tunable laser and a double-electro-absorption modulator.

The invention discloses a three-dimensional laser post-ionization-secondary neutron particle mass spectrometer which comprises a vacuum pool, a sample introduction system, a primary ion emission system, a three-dimensional laser post-ionization system, an ion optical system, a time-of-flight mass spectrometer, an observation system and a computer control system. By adjusting the wavelength, the frequency and the energy value of the laser, resonance between the energy of laser photons and the electron energy level of target molecules can be realized to realize selective ionization of substances, and the method has extremely high element, nuclide and molecule selectivity, can provide the sensitivity of an instrument, and can be used for mass spectrometry. The device can be applied to single-cell imaging analysis test of lipid, metabolites, small-molecule drugs and part of elements with the molecular weight smaller than 1000 Da, the problems of space metabolome small-molecule metabolite test and ultrahigh spatial resolution imaging are solved, and the device can be independently used as an SIMS when laser post-ionization is not used.

The present invention discloses a multi-wavelength tunable laser and sensing system, which relates to the field of lasers and includes: a setting module for presetting or selecting two wavelengths of laser beams in the laser; a camera module for collecting the user's target skin surface image for treatment in real time, identifying the tumor area and the healthy skin area in the image data, and identifying the current skin surface position of the laser beam. The present invention identifies the tumor area and the healthy skin area in the operation data by collecting the user's target skin surface image for treatment, further plans the laser treatment path based on the target skin surface image, and controls the laser in the process of moving according to the treatment path, in combination with the sensor to sense the tumor thickness, so as to achieve further intelligent control of the movement speed of the laser in the process of moving according to the treatment path, so that the tumor position on the user's skin surface can be treated more adaptively.

The invention discloses a method and device for monitoring settlement and convergence of tunnel surrounding rock. The method comprises the following steps that optical fiber sensing chains are installed in the circumferential direction of a tunnel; the tunable laser emits frequency sweeping light with continuous wavelength and then the frequency sweeping light is divided into two parts through the coupler A; after one part of light enters a coupler D, signals are transmitted to a first photoelectric detector; the other part of the light enters a coupler B, and after the light is split by the coupler B, one part of the light enters a polarization controller of the reference light path, and the other part of the light enters a measuring light path of the optical fiber sensing chain; optical signals in the reference optical path and the measurement optical path are subjected to beat frequency interference and are received by a balanced photoelectric detector; data of the first photodetector and the balanced photodetector are acquired. The optical fiber sensing chain is installed along the tunnel in the circumferential direction, tunnel deformation is monitored through an OFDR distributed optical fiber sensing system, overall deformation of a protection material is reconstructed through obtained distributed strain data, and an effective means is provided for large-range measurement of deformation fields such as a tunnel face.

The present invention relates in one aspect to an absorption spectroscopy apparatus for measuring one or more gases in an atmosphere, wherein the apparatus comprises a wavelength-tunable laser source, a control circuit configured to provide an electrical drive current to the wavelength-tunable laser source; wherein the control circuit is configured to create the electrical drive current as a modulated drive current, wherein the modulated drive current alternates between at least a first and a second drive current, the first drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a first wavelength and the second drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a second wavelength, different from the first wavelength, and wherein the modulated drive current defines a sequence of pulses, each pulse having a non-rectangular pulse shape.

A lidar system (10) comprises a tunable laser source (100) capable of emitting electromagnetic radiation, source radiation (15), which is reflected by an object (105). The lidar system (10) further comprises a multimode waveguide (112) capable of receiving radiation (16) reflected from the object (105), as well as several single-mode waveguides (1151, 1152,...115). n ) and a coupling device (118, 132) which is suitable for coupling the modes (161, 162) of the reflected radiation (16) guided through the multimode waveguide (112) to each of the single-mode waveguides (1151, 1152,...115) n ). The LIDAR system also includes several detection devices (125), each suitable for generating a superposition signal of a partial beam of the source radiation (15) with the reflected radiation (16) transmitted through an associated single-mode waveguide (1151, 1152,...115). nto prove that it has been led by a third party.

The invention discloses a method and device for measuring a crystal electro-optical coefficient at low voltage, and relates to the technical field of photoelectric coefficient measurement, and the method comprises the steps: employing a wavelength tunable laser as an incident light source of a crystal electro-optical coefficient detection system; before an incident light source is input into a to-be-measured laser crystal, a wave plate is added to serve as a phase compensator to generate phase delay phi 1, and meanwhile the to-be-measured laser crystal generates phase delay phi 2 under the action of direct-current voltage; when the crystal electro-optical coefficient detection system is a half-wave voltage detection system; adjusting the wavelength of the tunable laser so that 3pi / 4 is less than or equal to phi1lt; pi; when the crystal electro-optical coefficient detection system is a full-wave voltage detection system, the wavelength of the tunable laser is adjusted to enable 7pi / 4 to be smaller than or equal to phi1lt; 2pi. As the used light source is the wavelength tunable laser, phi 1 can be adjusted in a large range by changing the wavelength, so that phi 2 and the test voltage are changed, the purpose of measuring the electro-optical coefficient of the crystal at low voltage is achieved, and the test safety is improved.

The invention relates to the technical field of laser, and provides a high-power pulse width repetition frequency tunable laser, which comprises an input and output light path configured to input seed light and output amplified laser; a regenerative amplifier optical path configured to amplify the input seed light; and the pulse width compression module is configured to perform pulse width compression on the amplified seed light and output high-power pulse laser with tunable pulse width, and the pulse width compression module comprises a third polarizing beam splitter, a third 1 / 2 wave plate, a first electric control transverse movement plane mirror, a second electric control transverse movement plane mirror, a nonlinear crystal and a fourth plane mirror. On the basis of a nonlinear crystal multi-pass compression method, a high-power disc laser is built, pulse width compression is carried out on an annular cavity which contains a nonlinear crystal and a 1 / 2 wave plate or is added into a Pockels cell, and a high-power pulse width repetition frequency tunable pulse string is finally obtained by transversely moving a plane mirror through electric control.

The invention discloses a quasi-distributed sensing system based on a fiber type auxiliary interferometer and vernier sensitization, and relates to the technical field of optical fiber sensing. The system comprises a data acquisition module, a to-be-detected sample parameter detection device and a data processing module, the to-be-detected sample parameter detection device comprises a plurality of FPI sensors; the data acquisition module is used for acquiring optical signals corresponding to parameters of a sample to be measured and comprises a tunable laser, a main interferometer, an auxiliary interferometer, a polarization beam splitter, a balanced photoelectric detector and a data acquisition card; the main interferometer is a Mach-Zehnder interferometer, the auxiliary interferometer comprises a section of delay optical fiber with a preset length and two reflecting surfaces, and the auxiliary interferometer is arranged on a reference arm of the Mach-Zehnder interferometer; and the data processing module is used for performing first processing and second processing on the optical signal output by the data acquisition module so as to obtain the variable quantity of the to-be-detected sample parameter. According to the invention, the technical bottlenecks of complex structure, difficult debugging, low demodulation efficiency and the like in the traditional scheme are effectively overcome.

The invention discloses a rapid heating wavelength-adjustable laser chip integrated with a heat insulation pad and a preparation method, the rapid heating wavelength-adjustable laser chip comprises an epitaxial structure, a passivation layer, P-surface metal and N-surface metal, and the epitaxial structure comprises a substrate layer, a lower limiting layer, an active layer and an upper limiting layer from bottom to top in sequence; the active layer is set to be a passive area and an active area along the cavity length direction, a grating structure is arranged in the upper limiting layer, and the grating structure is arranged corresponding to the passive area and avoids the active area; the part, corresponding to the passive area, in the lower limiting layer is sacrificed to form a cavity, and a heat insulation material grows and is filled in the cavity to form a heat resistance cushion layer; and a ridge waveguide is formed on the front surface of the epitaxial structure. The heating efficiency of the chip is improved, the heating temperature can be accurately adjusted, and the overall structural strength of the chip is high.

The invention discloses a tunable laser, a photoelectric conversion module and a communication system, which are used for suppressing the concentration of photon-generated carriers in the tunable laser so as to effectively suppress phase noise. The tunable laser includes a gain module, a first waveguide module, a gain electrode, a first waveguide electrode, and a first heating element. The gain electrode applies current to the gain module, the gain module emits an optical signal according to the current, the first heating element applies first heat to the first waveguide module, and the first waveguide module tunes the wavelength of the optical signal under the action of the first heat, so that the tunable laser emits the optical signal tuned by the first waveguide module. The first waveguide electrode applies a first reverse bias voltage to the first PN junction, and the first reverse bias voltage is used for enabling the first PN junction to be in a reverse cut-off state.

The invention discloses a C-band tunable broadband light source system with a wavelength and power locking function. The C-band tunable broadband light source system comprises a tunable laser array chip, a main control module, a laser chip current driving module, a temperature control module, an optical splitter, a wavelength locking module and a power adjusting module, the temperature control module reads and adjusts the working temperature of the tunable laser array chip; the laser chip current driving module applies current excitation to each laser in the tunable laser array chip; emergent light of the tunable laser array chip is respectively transmitted to the wavelength locking module and the power adjusting module through the optical splitter; the wavelength locking module carries out wavelength locking on the emergent light based on two F-P etalon with the same response curve period and complementary response curve peak values; and the power regulation module adopts a PID algorithm to carry out power regulation and locking on the emergent light. According to the invention, any wavelength lasing can be realized in the C wave band, and the method has the advantages of rapidness, accuracy and the like in the aspect of wavelength and power deviation correction.