225 results about "Optical fibre amplifiers" patented technology

The invention discloses a polarization-state-based optical fiber vibration sensing system and application, and relates to the technical field of optical fiber sensing, and the polarization-state-based optical fiber vibration sensing system mainly comprises a transmitting end and a receiving end. The transmitting end comprises a laser diode, a first erbium-doped optical fiber amplifier, a first circulator, a polarization scrambler, a single-mode optical fiber link, a second circulator and a second erbium-doped optical fiber amplifier which are connected in sequence; and the receiving end comprises a polarization beam splitter, a first shunt module, a second shunt module, an optical mixer, a first balanced photoelectric detector, a second balanced photoelectric detector, a third balanced photoelectric detector and a polarization analysis module. According to the optical fiber vibration sensing system based on the polarization state and the application, the vibration monitoring performance and reliability in a long-distance and high-noise environment can be improved.

The invention discloses a control method and system of a high-power optical fiber amplifier, and relates to the technical field of optical fiber amplifiers, and the high-power optical fiber amplifier comprises a first-stage gain unit and a second-stage gain unit which are sequentially arranged along the transmission direction of light; the control method of the high-power optical fiber amplifier comprises the following steps: starting the high-power optical fiber amplifier according to a starting sequence of firstly starting a first-stage gain unit and then starting a second-stage gain unit; and closing the high-power optical fiber amplifier according to a closing sequence of firstly closing the second-stage gain unit and then closing the first-stage gain unit. According to the control method and system, the optical fiber amplifier can be controlled to realize relatively high power output, so that the optical fiber amplifier is suitable for being applied to a hollow-core optical fiber transmission system, the high-power optical fiber amplifier can be prevented from generating a huge reverse ASE signal to burn an optical path device under the condition of no input optical signal, and the application safety and reliability of the optical fiber amplifier are improved.

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

The invention discloses a system for simultaneously measuring temperature and pressure based on forward Brillouin scattering in a multi-core optical fiber, which relates to the technical field of optical fiber temperature and pressure double-parameter sensors, and is characterized in that light emitted by a pump light source enters a polarization controller after being modulated by a pump light modulation system, and then enters an erbium-doped optical fiber amplifier; one part is injected into a Sagnac ring, and the other part excites a high-order torsion-radial mode through a multi-core optical fiber; light emitted by the detection light source is divided into light beams transmitted in the clockwise direction and the anticlockwise direction through the coupler, and the light beams are injected into the Sagnac ring; the spectrum analyzer captures the frequency shift of the Brillouin scattering signal; the signal processing unit processes the frequency shift of the Brillouin scattering signal and inverts temperature and strain data; and the data analysis and feedback system is combined with machine learning to optimize temperature and strain data. According to the invention, high-sensitivity temperature and strain sensing is realized.

The application provides an optical fiber filter and an optical fiber amplifier, which can realize flat amplification of a few-mode optical signal, and can realize controllable adjustment of optical power of each optical signal mode in a plurality of optical signal modes transmitted by a fiber core of the optical fiber filter. The optical fiber filter comprises a fiber core, an inner cladding and an outer cladding, the refractive index of the fiber core, the refractive index of the inner cladding and the refractive index of the outer cladding are sequentially decreased, the fiber core is used for transmitting at least two different first optical signal modes, the inner cladding is used for transmitting at least two different second optical signal modes, and the fiber core is etched with at least one fiber grating; at least part of optical power of a target first optical signal mode is only coupled with a target second optical signal mode at the fiber grating, wherein the target first optical signal mode is one of the at least two first optical signal modes, and the target second optical signal mode is one of the at least two second optical signal modes.

The invention relates to the technical field of optical communication, in particular to a steady-state control method and device of an optical fiber amplifier, control over a plurality of pump lasers in an erbium-doped fiber amplifier (EDFA) is achieved in a mode of combining feed-forward control and feedback control, and the feed-forward control is used for obtaining initial pump current; according to feedback control, proportional integral differential calculation is carried out on an input and output optical power difference value to obtain a pump current correction amount; carrying out transient detection on the input optical power, correcting a proportional integral differential coefficient when the transient state occurs, and obtaining a pump current correction amount through a corrected proportional integral differential algorithm so as to obtain a master pump driving current; by distinguishing the transient effect of the input optical power and the judgment of the jitter of the input optical power, the requirement that the output optical power needs to be stably controlled when the transient state of the input optical power and the jitter of the input optical power occur is well met, and the defects that the transient index is poor and the jitter is poor are overcome. And meanwhile, the situation that the jitter of the output optical power is aggravated due to the jitter of the input optical power is inhibited.

The invention relates to the technical field of optical communication, in particular to a front optical fiber amplifier with a power balancing function. On the basis of a traditional Er-doped optical fiber amplifier, incident light is divided into a signal link and a competition link through a light splitting device with a fixed proportion. The purpose of introducing the competitive link is to generate a competitive wavelength which has an obvious competitive effect with the signal light in the EDF, and gain competition is carried out in the amplification process of the signal light in the EDF; wherein the competitive link finishes conversion from signal light wavelength to wavelength with obvious competitive effect by adopting a four-wave mixing principle based on HNLF, and then reversely inputs the converted competitive light into the EDF of the signal link to carry out a light amplification process with gain competition, so that the aim of reducing the output power fluctuation range after the signal light is amplified by the EDF is fulfilled.

The invention relates to the technical field of optical communication, in particular to a real-time monitoring protection circuit and method for a high-power optical fiber amplifier, and the circuit comprises at least one monitoring module and a processing module. And the processing module judges whether the optical power value reaches a threshold value or a target signal power set value in optical path design and judges whether the optical power value meets system requirements, if the optical power value does not meet the system requirements, an enable signal is output, and a pump laser in a post-stage second amplification module is enabled to be closed, so that the security control of the post-stage pump laser is realized. The damage to the active optical fiber of the key part in the high-power optical fiber amplifier caused by manual misoperation, optical path function failure or sudden failure of a monitoring device can be effectively prevented.

A cable discharge optical fiber detection sensor belongs to the technical field of optical fiber sensing and comprises a light source, a single-mode optical fiber, an acoustic optical modulator, an erbium-doped optical fiber amplifier, a beam splitter, a circulator, a beam combiner, a photodiode, a data processor and an optical fiber cable. The positive magnetostriction annular optical fiber and the negative magnetostriction annular optical fiber are arranged on the two sides of the high-voltage cable respectively, and the cable sheath is arranged outside the high-voltage cable. The technical scheme of the invention not only overcomes the limitation of the traditional discharge detection method, but also provides a novel sensor which is high in sensitivity, strong in anti-interference capability and easy to deploy in a distributed manner for the safety monitoring of the high-voltage cable, and has important engineering application value.

The invention discloses a circuit breaker plum blossom contact contact stroke intelligent detection method and system, and the method comprises the steps: a configuration step: a static contact is configured with an optical fiber sensing array, an image collection module and a light supplement module, the optical fiber sensing array comprises an optical fiber sensor, the optical fiber sensor comprises an optical fiber probe, and a matched optical fiber cable and an optical fiber amplifier, the image acquisition module comprises an industrial camera; a dynamic detection step: comprehensively scheduling an optical fiber sensor and an industrial camera, and collecting displacement data of a contact piece of the moving contact and connection state data of the closed moving contact and static contact in real time; a data processing step: fusing the displacement data of the optical fiber sensor and the image data of the industrial camera, evaluating the contact state and surface defects of the static contact and the moving contact, embedding a lightweight AI reasoning chip to carry out localization real-time processing, and adopting a contact wear compensation algorithm to carry out real-time processing on the basis of the contact closing times and historical wear data. Dynamically adjusting the detection threshold value of the optical fiber probe and the parameters of the contact state evaluation model.

The invention discloses an optical fiber mine magnetic detection sensor and system based on a magnetic composite sheath and an FPI, and belongs to the technical field of optical fiber sensing and mineral resource detection. The magnetic composite sheath optical fiber sensor comprises an optical fiber core, a Fabry-Perot interference cavity inscribed in the fiber core, a wrapping layer wrapping the outer side of the fiber core, a coating layer wrapping the outer side of the wrapping layer, and a magnetic composite sheath wrapping the outer side of the coating layer. And the magnetostrictive composite sheath is prepared by compounding Terfenol-D / Metglas and novolac epoxy resin. The optical fiber detection sensing system comprises a laser light source, an acousto-optic modulator, an erbium-doped optical fiber amplifier, a beam splitter, a circulator, a magnetic composite sheath optical fiber sensor, a reference optical fiber sensor, a beam combiner, a detector and a data processor. The optical fiber mine magnetic detection sensor and system are widely applied to underground mineral magnetic field detection, and have the advantages of high sensitivity, high environmental adaptability, low cost and the like.

This invention discloses a multi-channel programmable miniaturized high-speed FBG demodulation system and method based on an AWG (Optical Fiber Optic Generator), belonging to the field of fiber optic sensing technology. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation system includes a high-stability broadband light source module, a low-loss isolation module, a miniaturized programmable fiber optic amplifier, a circulator, a two-stage miniaturized high-speed optical switch, a high-crosstalk AWG module, a photoelectric conversion module, a programmable A / D conversion module, and a core control module. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation method involves the optical signal entering an FBG sensor array, the FBG sensor reflecting the optical signal, the reflected optical signal entering the AWG module, and the output light undergoing photoelectric conversion to calculate the center wavelength of the FBG sensor. This invention, based on an AWG, improves demodulation accuracy while ensuring the demodulation range, achieving continuous wavelength demodulation within the AWG wavelength range.

According to the automatic testing system for the optical fiber amplifier for the inter-satellite laser communication terminal, full-automatic execution of the testing process is achieved through the automatic control and intelligent testing technology. The problems that in the prior art, an optical fiber amplifier manual testing technology needs to manually send a control instruction, set instrument parameters, read instrument data and write in a data recording table, and manual guarding is needed during long-time testing are solved. And the technical problems of easy misoperation, complicated operation steps, long test time consumption and high manpower / time consumption cost of manual instruction sending are solved.

A reflection-type leveling optical fiber sensor belongs to the technical field of optical fiber sensors and comprises an optical fiber head, an optical fiber lead, an optical fiber amplifier, an annular flange plate, a leveling assembly and a clamping assembly. The leveling assembly and the optical fiber amplifier are arranged above the annular flange plate in parallel; the clamping assembly is arranged above the leveling assembly; the optical fiber head is arranged on the clamping assembly and connected with the optical fiber amplifier through an optical fiber wire. The optical fiber leveling device has a leveling function, light emitted by the optical fiber head can accurately and vertically irradiate downwards through leveling operation, light reflected from the surface of a detected object can be accurately received, and the detection precision is improved; according to the utility model, the dismounting structure and the adjusting structure of the optical fiber head are simplified, the mounting and dismounting convenience of the optical fiber head is improved, the mounting and debugging difficulty of the optical fiber head is reduced, the long-term stability of the optical fiber sensor is improved, and the applicability of the optical fiber sensor to occasions with narrow space or strict weight requirements is improved; and meanwhile, the production cost is reduced.

This invention discloses a high-speed sweeping fiber optic light source. The specific device includes: a mode-locked pulse light source, an optical fiber amplifier, a highly nonlinear optical fiber, and a dispersion-compensating optical fiber. The passively mode-locked pulse light source outputs a high repetition rate, wide-spectrum mode-locked pulse. Its dispersion propagation follows a parabolic differential equation similar to one-dimensional paraxial diffraction, analogous to Fraunhofer diffraction. The pulse is amplified outside the cavity by an optical fiber amplifier to increase the laser pulse energy and peak power. Then, it is broadened by the highly nonlinear optical fiber to obtain a supercontinuum light source. Finally, the pulse is stretched by a highly dispersive medium provided by the dispersive optical fiber, and the pulse frequency domain spectrum is mapped to a time domain waveform, thereby realizing a high-speed sweeping frequency light source in the time domain.

The invention relates to a method for estimating the ion doping concentration of a rare earth doped optical fiber, and belongs to the technical field of optical fiber amplifiers. An optical fiber to be measured is used for building an optical fiber amplifier, measurement is carried out under the condition of no signal light input, and signal light interference is avoided; reverse fitting is carried out through a simulation model, and the doping concentration is adjusted until the relative error lt is reached; 2%; taking the rare earth ion doping concentration determined in simulation as the doping concentration of the optical fiber to be measured; by measuring the change of the output spectrum of the optical fiber amplifier and comparing the change with a simulation result, the doping concentration is estimated, and the measurement period and the measurement cost are greatly reduced. The method realizes non-destructive and rapid estimation of the doping concentration, remarkably shortens the detection time through real-time measurement and simulation iteration of the spectral power ratio, is low in cost and short in test period, and can be applied to the field of optical fiber amplifier research and other application scenes.

The utility model relates to the technical field of optical fiber communication and laser, in particular to a double-shaft double-wavelength polarization-maintaining ultrahigh-power optical fiber amplifier, which comprises a polarization-maintaining beam splitter, a polarization-maintaining wavelength division multiplexer, a polarization-maintaining doped fiber, a polarization-maintaining beam combiner, a double-cladding polarization-maintaining optical fiber and a polarization-maintaining coupler, the other side of the polarization-maintaining wavelength division multiplexer is in optical fiber connection with a polarization-maintaining doped fiber, the other side of the polarization-maintaining doped fiber is connected with a polarization-maintaining beam combiner, the other side of the polarization-maintaining beam combiner is connected with a double-cladding polarization-maintaining optical fiber, and the other side of the double-cladding polarization-maintaining optical fiber is in optical fiber connection with a polarization-maintaining coupler; according to the utility model, stable and high-power output can be realized on two different spectral wavelengths at the same time, the polarization state of signal light is kept unchanged, the signal quality and the system performance in an optical communication system and industrial laser application are remarkably improved, the dual-wavelength high-power output and the polarization maintaining performance are realized, and the application range is wide. And the reliability and efficiency of the system are improved.

The embodiment of the invention provides an optical transmission amplification method, an optical amplifier, a computer program product and a storage medium. A new working mode is designed in the erbium-doped optical fiber amplifier, and the erbium-doped optical fiber amplifier can enter the working mode when a line fault is monitored. In the working mode, an input optical signal can be blocked on a transmission link in the erbium-doped optical fiber amplifier, so that an output unit which is not influenced by the input optical signal can be isolated in the erbium-doped optical fiber amplifier; on the basis, the output unit can be controlled to generate an output optical signal according to the expected output power during the fault period. Therefore, under the condition that a line fault occurs in an optical transmission system, the erbium-doped optical fiber amplifier can realize decoupling between the output power and the input optical signal based on the working mode, and the output power is not influenced by the input optical signal any more, so that the erbium-doped optical fiber amplifier can still maintain stable output power; therefore, the performance stability of the optical transmission system is ensured.

The invention relates to a multi-stage intelligent control method for driving an optical fiber amplifier, belongs to the technical field of optical fiber amplifiers, solves the problem of insufficient output power control precision of an optical fiber amplifier in the prior art, and comprises the following steps: S1, building a pumping source system, building an optical fiber amplifier system with multi-stage pumping sources, and setting the multi-stage pumping sources, the input seed light and an input signal of the multi-stage pumping source are amplified through multi-stage optical fibers to obtain output power; s2, building a mathematical model of a pumping source system, including building a mathematical model of pumping power of a pumping source and a mathematical model of system output power, and setting initialized input parameters; s3, based on the constructed mathematical model of the pumping source system, executing a control algorithm iteration process to obtain the optimal driving current and the maximum power of the pumping source; and S4, outputting the optimal driving current and the maximum power of the pumping source to the pumping source system, and executing multi-stage intelligent control on the pumping source system.

The application discloses a kind of optical fiber amplifiers without transmission optical fiber and its laser, including the pre-processing module, first module and second module sequentially arranged along the signal light transmission direction;Pre-processing module is connected with first module by first gain optical fiber, first module is connected with second module by second gain optical fiber, to constitute a light amplification mechanism;Different from prior art, the application only uses gain optical fiber in signal light transmission path.Compared with the configuration of transmission optical fiber, the use of gain optical fiber not only can significantly reduce the risk of nonlinear effect, but also avoids the trouble of increasing fusion point caused by introducing transmission optical fiber.In addition, the application also introduces reverse pumping technology, compared with forward pumping, this technology can further weaken nonlinear effect and improve its threshold.

The invention provides a gradient scattering enhanced optical fiber and a design method thereof. The gradient scattering enhanced optical fiber comprises a first enhanced optical fiber, a second enhanced optical fiber and a third enhanced optical fiber, detection pulse signals sent by the plurality of lasers enter the first enhanced optical fiber through the first WDM device; a detection pulse signal transmitted by the first enhanced optical fiber and a first type of amplification signal sent by the first optical fiber amplifier enter a second enhanced optical fiber through a second WDM (Wavelength Division Multiplexer); a detection pulse signal transmitted by the second enhanced optical fiber and a second type of amplification signal sent by the second optical fiber amplifier enter a third enhanced optical fiber through a third WDM (Wavelength Division Multiplexer); the gradient scattering enhanced optical fiber comprises a plurality of optical fiber units, and target scattering rates of different optical fiber units are different or the same; the optical fiber unit determines a signal reflection power based on a reception power of the probe pulse signal and a target scattering rate of the optical fiber unit, and transmits the scattered light signal based on the signal reflection power. According to the scheme, the detection distance of distributed sound wave detection can be remarkably increased.

The invention discloses an optical fiber amplifier without a transmission optical fiber and a laser thereof. The optical fiber amplifier comprises a preprocessing module, a first module and a second module which are sequentially arranged in the signal light transmission direction. The preprocessing module is connected with the first module through a first gain optical fiber, and the first module is connected with the second module through a second gain optical fiber to form a light amplification mechanism; different from the prior art, only the gain optical fiber is adopted in a signal light transmission path. Compared with the configuration of the transmission optical fiber, the use of the gain optical fiber not only can significantly reduce the risk of causing a nonlinear effect, but also avoids the trouble of welding point increase caused by introduction of the transmission optical fiber. In addition, a reverse pumping technology is further introduced, and compared with a forward pumping technology, the technology can further weaken the nonlinear effect and improve the threshold value of the nonlinear effect.

The invention discloses a multi-parameter distributed optical fiber sensing system and method, and relates to the technical field of optical fiber sensing, the system comprises a laser, a coupler, a modulator, an optical fiber amplifier, an optical fiber circulator, a wavelength division multiplexer, a polarization controller, a mixer, a data acquisition card and a microprocessor; the method comprises the steps that output light of a laser is divided into two paths, a Rayleigh detection pulse coding sequence is generated through a modulator and amplified by an optical fiber amplifier and injected into an optical fiber to be detected, Rayleigh scattering light and Raman scattering light of pulses are separated by a wavelength division multiplexer, the Rayleigh scattering light and adjusted local oscillation light are mixed and then received by a balanced photoelectric detector, and the optical fiber to be detected is obtained. And the data acquisition card carries out subsequent signal processing. According to the invention, a pulse sequence is adopted as a detection light signal to realize receiving demodulation of a Raman scattering signal and a Rayleigh scattering signal, a Gray coded pulse sequence is adopted to realize improvement of a signal-to-noise ratio of the Raman scattering signal and detection of a wide-spectrum signal of the Rayleigh scattering signal, and the detection performance of a vibration signal is improved.

1. The name of this design product: Single-channel fiber optic amplifier. 2. Purpose of this design product: This design product is used for a single-channel optical fiber amplifier in the field of laser communications. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture. 5. The left view is symmetrical to the right view, so the left view is omitted.

The invention relates to a railway signal processing method and system, computer equipment, a computer readable storage medium and a computer program product. The method comprises the steps of obtaining a railway signal of a railway line; the railway signal comprises a current signal, a voltage signal and a temperature and humidity signal; compressing the railway signal to obtain a compressed railway signal; the compressed railway signal is converted into an optical pulse sequence with corresponding intensity, the power of the optical pulse sequence is subjected to equalization adjustment through an optical fiber laser, and the optical pulse sequence subjected to power adjustment is subjected to distributed amplification through a Raman optical fiber amplifier; converting the optical pulse sequence after distributed amplification into an electric signal, and performing gain amplification processing on the electric signal to obtain an electric signal after gain amplification; shaping and filtering the electric signal after gain amplification to obtain a filtered electric signal; and performing anomaly detection on the filtered electric signal to obtain an anomaly detection result. By adopting the method, the railway power supply fault analysis efficiency can be improved.

The application discloses a parallel optical fiber amplifier channel equalization system based on signal power adaptive grading, and is characterized in that: the system further comprises a power detection and grading module arranged in front of the parallel amplifier and used for detecting the input optical signal in real time and dividing the optical signal into several power grades based on a preset or adaptive threshold, and a signal distribution and merging module used for guiding the optical signals of different power grades divided to corresponding parallel amplifier paths and merging the optical signals output by each path after the parallel amplifier completes amplification processing to realize channel power equalization; through power grading and differential amplification, the application reduces the difference value of the output power of each channel, realizes intelligent equalization of multi-channel optical signals, improves system gain flatness, effectively reduces the bit error rate caused by power imbalance, avoids the problems of gain saturation of high-power signals and insufficient gain of low-power signals, and improves channel capacity.

An optical fiber amplifier includes a first optical combining / splitting module, a multi-core gain module, and a second optical combining / splitting module. The first optical combining / splitting module is configured to couple a first optical signal to a first gain fiber core. The first gain fiber core is configured to amplify optical power of the first optical signal to obtain a second optical signal, and is configured to couple the second optical signal to the second optical combining / splitting module. The second optical combining / splitting module is configured to couple the second optical signal to a second gain fiber core. The second gain fiber core is configured to amplify optical power of the second optical signal to obtain an amplified second optical signal, where the first gain fiber core and the second gain fiber core separately perform optical power amplification based on different pump optical signals.

The utility model relates to the technical field of optical fiber amplifiers, and discloses a positioning tool for an optical fiber amplifier, which comprises an assembly table, a positioning plate is arranged at the top of the assembly table, a fixing groove is formed in the positioning plate, a shell is placed in the fixing groove, a transmission plate is movably mounted in the fixing groove, and the transmission plate is movably mounted in the fixing groove. And a transmission bin is formed in the rear side of the positioning plate. When the device is pushed by the shell, the transmission plate, the ratchet strip and the pressing plate synchronously displace, when the pressing plate displaces, teeth in the transmission frame drive the gear to rotate, the gear rotates to pull the moving block to displace through the two sets of connecting rods, the shell is clamped by the clamping blocks, and compared with a traditional device, the device can achieve positioning and clamping by pushing the shell, and the clamping efficiency is improved. The dismounting of the shell is completed by rotating the knob, so that the positioning precision is ensured while the dismounting efficiency of the shell is improved, and the workload of workers is reduced.

This invention discloses a transmitting device and its packaging method for improving the performance of a C+L400G fiber amplifier, belonging to the field of optical communication and fiber amplification technology. The device includes an airtight housing, a five-channel pump laser emitting unit, a multiplexing and output unit, a bandwidth gain monitoring unit, a temperature detection unit, and a control and storage unit. The device uses four narrowband monitoring channels to constrain and sample the key gain states of the C-low / C-high / L-low / L-high subbands, and simultaneously collects temperature and the workload of the five pumps. Individualized calibration, threshold determination, and model / parameter writing are completed at the factory stage. During operation, using the monitored signals and temperature as input, a 12-subband gain prediction vector is output through the written prediction model, and the five pump currents are adaptively adjusted using closed-loop control. The packaging method includes steps such as device assembly and connection, sealing and leak detection, factory calibration modeling and writing, and online closed-loop control operation.

A diaphragm-type optical fiber micro-vibration measurement apparatus and method based on a single-pass band microwave photonic filter. The apparatus comprises a broadband light source module (1), a three-port circulator (2), an AU diaphragm optical fiber micro-vibration sensor (3), an erbium-doped optical fiber amplifier (4), a polarization controller (5), an electro-optical modulator (6), a power supply module (7), a radio-frequency source module (8), a dispersion compensation optical fiber (9), a photoelectric detector (10), a data acquisition card (11) and a computer (12), wherein the broadband light source module (1) is connected to one port of the three-port circulator (2) by means of an optical fiber connection line.