263 results about "Fiber amplifier" patented technology

The invention discloses an equivalent self-noise pressure suppression method and device based on a multi-core optical fiber space division multiplexing signal, light emitted by a narrow linewidth laser is split through a first coupler C1, one path of light passes through an acousto-optic modulator AOM to generate a pulse signal, and then the pulse signal passes through a second coupler C2 to generate a pulse signal; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; based on the dual-channel DAS system, the multi-core optical fiber serves as the sensing optical fiber, three cores and four cores of the multi-core optical fiber are connected in series to form two sensing channels, seven-core space division signals are multiplexed, the equivalent self-noise suppression effect of the seven-core space division signals is analyzed, and the detection capacity of the system for low-frequency weak signals can be improved.

The present invention provides an automatic EDFA signal power control method and apparatus based on real-time ASE compensation. Target output signal power is set; when input optical power fluctuates, a real-time gain is obtained on the basis of the target output signal power and real-time input optical power; corresponding ASE power is obtained by means of the real-time gain, and the target output signal power and the ASE power are added to obtain expected total output power; and when current real-time total output power is adjusted to be the expected total output power, it can be ensured that output signal power in the real-time total output power is locked as the target output signal power while the current ASE power is compatible, thereby ensuring that the output signal power of a fiber amplifier is not affected by the fluctuations of the input optical power.

The invention discloses an equivalent self-noise pressure suppression method based on a dual-channel distributed acoustic sensing system, and the method comprises the steps: carrying out the light splitting of light emitted by a narrow-linewidth laser through a first coupler C1, enabling one path of light to generate a pulse signal through an acoustic optical modulator (AOM), enabling the other path of light to pass through a second coupler C2, and enabling the other path of light to pass through a second coupler C1; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; according to the invention, based on a dual-channel DAS system, two fiber cores of the multi-core optical fiber are used as sensing optical fibers, and the space division signals of the two cores are multiplexed, so that the performance that the equivalent self-noise pressure drop is 2.54 dB in the frequency band of 100-1000Hz is realized under the condition that the noise correlation coefficient of the dual-core signals is 0.11, and the detection capability of the system on low-frequency weak signals can be improved.

The invention discloses a communication optical axis autonomous correction method based on tracking point nutation, which comprises the following steps: controlling a fine-following fast reflector to scan, monitoring the output power of an erbium-doped fiber amplifier (EDFA) within scanning residence time, searching the position of the maximum power by adopting a sliding window average algorithm, and recording the position; and after scanning for one period, returning to the tracking point with the maximum recorded power, thereby realizing rapid and accurate calibration of the tracking optical axis of the laser communication terminal. According to the invention, a closed loop is formed based on tracking point nutation and a pre-amplification output signal, so that high-precision correction of a camera tracking point is realized, the stability of precise tracking of the system can be improved, and the signal-to-noise ratio received by the laser communication system can also be improved; the traditional receiving optical axis calibration convergence speed and precision are improved; higher real-time performance and automation degree are achieved, relevant data can be acquired and processed in real time, and correction of a receiving optical axis is achieved; the method has wide applicability and expandability, and can be applied to other spacecraft systems needing high-precision tracking control.

The invention belongs to the technical field of microwave photon links, and particularly relates to a high-resolution microwave photon frequency measurement system based on real-time Fourier transform. The link comprises a mode-locked laser, a first dispersion compensation module, a second dispersion compensation module, a dual-drive Mach-Zehnder modulator, a Mach-Zehnder modulator, a dispersion optical fiber, a time lens, an erbium-doped optical fiber amplifier, a photoelectric detector and an oscilloscope; the mode-locked laser outputs femtosecond Gaussian light pulses, and the femtosecond Gaussian light pulses are injected into the first dispersion compensation module and then stretched into chirp light pulses; modulating the chirp light pulse through electro-optical modulators which are connected in parallel; the modulated optical signal is subjected to time amplification processing through a dispersion optical fiber, a time lens, a second dispersion compensation module and an erbium-doped optical fiber amplifier in sequence; and the optical signal after time amplification processing is converted into a microwave pulse carrying frequency information of the signal to be detected by a photoelectric detector, and the microwave pulse is observed by an oscilloscope.

The present invention relates to a lidar system including: laser transmitter and receiver systems, the laser transmitter system including: a wavelength-tunable seed laser which emits pulses at selected wavelength points, and switches between wavelengths within a switching time of <200 ns; a fiber amplifier which amplifies the laser pulses up to 200 kW to a transmitter grating; and a transmitter telescope including primary and secondary mirrors. The laser beam is directed from the transmitter grating to the secondary then primary mirrors, and the first transmitter grating is imaged on the primary mirror to minimize laser beam wander thereon. The transmitter grating diffracts and steers the laser beam by wavelength to a surface, to an arbitrary subset of <2000 resolvable footprints along a cross-track direction at a beam pointing angle switching time of <200 ns, such that footprints illuminated by the laser beam on the surface are imaged in 3D.

The invention provides a satellite-borne EDFA on-orbit performance degradation monitoring method and system. The satellite-borne EDFA on-orbit performance degradation monitoring method comprises the steps that a health baseline is preset; closing input light and a first-stage pump of the satellite-borne EDFA; driving a second-stage pump of the satellite-borne EDFA to maintain fixed power output, and recording the working temperature of the second-stage pump; acquiring the monitoring optical power of the second-stage pump and the spontaneous radiation power of the output end of the satellite-borne EDFA; calculating to obtain spontaneous radiation conversion rate; and carrying out satellite-borne EDFA degradation determination. The method has the beneficial effects that the interference of temperature fluctuation on a monitoring result is greatly reduced through the spontaneous radiation conversion rate which is a relative parameter, and the method is adaptive to a complex thermal environment of a satellite; degradation is judged based on a preset health baseline, precise monitoring of the performance state of the satellite-borne EDFA is achieved, and a reliable basis is provided for maintenance. Precise positioning of a degraded part is realized, a fault source is clear, blind maintenance is avoided, and the maintenance efficiency is improved; monitoring can be completed in a second level and can be arranged to be carried out in a communication intermittent period, and normal communication service of the satellite is not affected.

The invention relates to the technical field of multi-network connection, in particular to a Raman optical fiber amplifier remote monitoring system based on multi-network connection. Multiple different network connection modes are achieved through the multiple network connection units, flexible transmission and remote monitoring of data are achieved, a proper network interface can be automatically selected for data transmission according to the current network environment, and the flexibility and stability of network connection are guaranteed. According to the method for packaging the data frames of the different network media on the data link layer, the integrity and effectiveness of the data on the different transmission media are ensured, the system complexity is reduced, and the data transmission efficiency and the system response speed are improved. Especially in a multi-network connection environment, the optimized data link layer processing module can effectively reduce data delay and improve the real-time monitoring capability of the system. Wide area network transmission of data is realized through an MQTT protocol, and safe transmission and real-time monitoring of remote data are ensured.

An on-chip integrated microwave photonic phase-coded signal generation system relates to the field of microwave photonic technology. The system includes a laser, a power splitter, a radio frequency (RF) switch, a 90° hybrid coupler (HC), a dual-parallel dual-polarization Mach-Zehnder modulator (DP-DPMZM), a polarization-dependent cascaded phase modulator (PDC-PM), a polarization beam splitter, an erbium-doped fiber amplifier, and a photodetector. In this method, the local oscillator (LO) signal is split into two parts by a power splitter. One part is input into the X-DPMZM to obtain the carrier suppression +1st order sideband of the LO signal. The other part is controlled by an RF switch. When the RF switch is off, the Y-DPMZM only outputs an optical carrier; when the RF switch is on, the Y-DPMZM outputs the -1st order sideband of the LO signal. Then, two orthogonally polarized signals are input into the PDC-PM, which is driven by two independent coding signals. When the amplitude and mode of the coding signals are changed, a binary or quaternary phase-coded signal with a carrier frequency equal to or twice that of the LO signal can be obtained through a photodetector.

The invention discloses a power cable laying stress monitoring device which comprises a stress sensing module, a signal processing module, a data transmission module and a power supply module. The stress sensing module adopts an integrated FBG (Fiber Bragg Grating) sensor array of a flexible mounting belt, and realizes non-damage coating of a cable with the diameter of 3-200mm through an adjustable fastening device; the signal processing module comprises a low-noise optical fiber amplifier and a self-adaptive noise reduction algorithm, and is used for realizing + / -0.5 mu epsilon strain resolution and 5ms dynamic response; the data transmission module adopts a multi-band 4G / 5G communication module and supports AES-256 encryption and edge calculation; and the power supply module adopts a solar energy-lithium iron battery hybrid power supply system to realize 30-day uninterrupted operation. Through collaborative design of the FBG sensing array and the flexible mounting belt, the device solves the problems of poor mounting adaptability, low precision, response lag and the like of a traditional stress monitoring device, and is particularly suitable for real-time stress monitoring in the power cable laying process.

The present application provides a laser generation circuit and an erbium-doped fiber amplifier, relating to the field of optical communication technologies. The jitter signal generation circuit includes: a jitter signal module, an analog signal module, and a clock signal module; the first input end of the jitter signal module is connected to the output end of the analog signal module, the control end of the jitter signal module is connected to the output end of the clock signal module, and the output end of the jitter signal module is used to output a jitter signal. By connecting the jitter signal module to the analog signal module and the clock signal module respectively, the present application can adjust the amplitude of the analog signal output by the analog signal module to achieve the adjustment of the amplitude of the jitter signal, and can adjust the frequency of the clock signal output by the clock signal module to complete the adjustment of the frequency of the jitter signal, so as to be compatible with lasers provided by multiple manufacturers, without adding optical attenuation devices at the output end of the laser, and effectively reducing the cost of preparing the EDFA.

An amplifier operable with an electric drive signal can amplify signal light having a signal wavelength. A laser diode has an active section with input and output facets. The facets are in optical communication with the signal light and are configured to pass the signal light through the laser diode. The active section is configured to generate pump light in response to injection of the electrical drive signal into the active section. The pump light has a pump wavelength different from the signal wavelength. A doped fiber doped with an active dopant is in optical communication with the signal light and is in optical communication with at least a portion of the pump light from the laser diode. The pump wavelength of the pump light is configured to interact with the active dopant of the fiber and thereby amplify the signal light.

The present invention discloses a variable beam divergence angle laser communication terminal and a rapid acquisition method thereof, belonging to the technical field of optical communication devices, including a main telescope, a fine tracking fast steering mirror, a beam splitter, a filter, a beam splitter, a beacon receiving lens group, a beacon detector, a signal transmitting mirror group, a pre-aiming fast steering mirror, a signal receiving mirror group, a receiving fiber amplifier, a multi-core fiber splitter, an optical switch, and a transmitting fiber amplifier, which constitute a signal light transmitting optical path, a beacon light receiving optical path, and a signal light receiving optical path; the signal light transmitting optical path provides a transmitting beam through different mode field fibers, and uses different paths of the transmitting mirror group to shape and variably beam-divergence emit the transmitted light, the signal light receiving optical path is used to collect, shape, couple, and optically amplify the input signal light, and the beacon light receiving optical path is used to collect, shape, converge the input signal light, and use an image positioning detector to position the target light spot. The present invention can improve the efficiency of long-distance acquisition.

The invention discloses a multi-core optical fiber amplifier with a large core-to-cladding ratio and a gain method. The multi-core optical fiber amplifier is characterized by comprising a multi-core optical fiber formed by a plurality of independent rare earth-doped fiber cores and a cladding structure located on the outer side of the multi-core optical fiber, the cladding structure is internally provided with at least one layer of low-refractive-index isolation region which is used for remarkably compressing the effective cladding area of pumping propagation and improving the capturing efficiency of the whole pumping energy, and the ratio of the total cross sectional area of the multi-core optical fiber to the effective cladding area is not less than 0.1. The low-refractive-index isolating layer is embedded in a conventional cladding structure, so that a pump light propagation area can be effectively compressed on an optical path, the relative proportion of the fiber core in the cross section is increased, the proportion (CCAR is larger than or equal to 0.1) of the total area of the fiber core to the cladding area is remarkably increased, and therefore the pump capture efficiency is improved.

The invention provides a C + L + S wave band multi-device configuration optimization method and device, and the method comprises the steps: calculating the approximate optimal transmission power of an optical fiber entrance part through employing a local optimal approximate global optimal algorithm; taking the approximate optimal transmitting power as the receiving power of each span section, and recalculating the transmitting signal power at the starting position of the span section by reversely solving a stimulated Raman scattering effect power evolution equation; the gain and gain slope of the optical fiber amplifier are set, so that the signal power which begins to be input in each span segment approaches the transmitting signal power; constructing a loss function based on the generalized signal-to-noise ratio of each wave band; and the gain and the gain slope set after inversion of the stimulated Raman scattering effect are used as initial values, and the gain and the gain slope of the optical fiber amplifier and the channel loss value of the wavelength selection switch are iteratively optimized by using a gradient rising algorithm and taking the loss function improvement as a target. According to the method provided by the invention, only a small amount of iteration is needed, the operation speed is high, and multi-device second-level configuration optimization of the broadband optical transmission system can be realized.

The invention discloses an ultrahigh repetition frequency adjustable ultrashort pulse cluster generator which comprises a mode-locked fiber laser, a first fiber coupler, a fiber delay line, a dispersion compensation fiber, a second fiber coupler, a fiber amplifier and an acousto-optic modulator. The first optical fiber coupler, the optical fiber delay line, the dispersion compensation optical fiber, the second optical fiber coupler and the optical fiber amplifier are sequentially connected end to end to form an optical fiber annular cavity, and the annular cavity is used as a frequency increasing device for pulse multiplication; the length difference between the optical fiber annular cavity and a mode-locked cavity in the mode-locked optical fiber laser is adjusted through the optical fiber delay line, and frequency increasing is carried out by using a vernier effect generated by time delay; the ultrahigh repetition frequency ultrashort pulse cluster laser output with adjustable parameters is realized through gain adjustment in the optical fiber annular cavity and synchronous pulse pickup outside the cavity. According to the technical scheme, the structural design is reasonable, the structure is simple, stability is good, sub-pulses are strictly equidistant, parameters are flexible and adjustable, and practicability is good.

The invention provides an optical feedback resonance enhanced forward Brillouin demodulation structure, which comprises a tunable laser, a first polarization controller, an erbium-doped optical fiber amplifier, an optical coupler, an optical isolator, a forward Brillouin gain optical fiber, a band-pass filter and a photoelectric detector, a second polarization controller; and a spectrum analyzer. The first polarization controller is connected with a port a of the optical coupler, a port b of the optical coupler is connected with an input end of the erbium-doped optical fiber amplifier, an output end of the erbium-doped optical fiber amplifier is connected with the optical isolator, the optical isolator is connected with the band-pass filter, the band-pass filter is connected with the forward Brillouin gain optical fiber, and the optical fiber is fed back to a port c of the coupler through the second polarization controller. The output power of the erbium-doped optical fiber amplifier is controlled, and the polarization states of the pump light and the feedback laser are controlled by the first polarization controller and the second polarization controller, so that the forward Brillouin effect is amplified.

The utility model belongs to the field of distributed optical fiber sensing, and particularly relates to a compact high-signal-to-noise-ratio dark pulse BOTDR (Brillouin Optical Time Domain Reflectometer) system for engineering, which comprises a laser, and the output end of the laser is connected with a first photoelectric coupler which is used for dividing light emitted by the laser into upper light and lower light. The dark pulse modulation system module is arranged, descending pump light is equivalent to a dark pulse through modulation, a computer controls dark pulse time slots so as to change pump pulse characteristics, a corresponding demodulation method is adopted in rear-end data processing, Brillouin frequency shift along a sensing optical fiber is obtained, and the Brillouin frequency shift is converted into Brillouin frequency shift along the sensing optical fiber. The lower limit of the spatial resolution of the method is equal to the fall time of the modulation system, and the spatial resolution can be greatly improved under the condition of improving the signal-to-noise ratio. In addition, due to narrow pulse width and low energy of the traditional bright pulse, an erbium-doped fiber amplifier (EDFA) is generally needed for signal amplification. Dark pulses are close to continuous light in most cases, and EDFA is not needed, so that the system design is simplified, and the cost is reduced.

The present invention discloses a double-clad fiber pump return filter, which relates to the technical field of fiber amplifiers and fiber lasers. The filter includes an input fiber collimator, a triangular prism, a supporting glass tube, a filter, an output fiber collimator, and a bridge glass tube; the supporting glass tube is fixedly installed in the middle position inside the bridge glass tube, and the triangular prism and the filter are respectively fixedly installed at both ends of the supporting glass tube; the input fiber collimator and the output fiber collimator are respectively inserted into the two ends of the bridge glass tube and fixed after optical debugging; the present invention uses the dispersion effect to cause the transmission angles of the pump light and signal light transmitted on the same optical fiber to deviate, and then the residual pump light can be returned to the original path while maintaining high return loss of the signal light, effectively improving the utilization efficiency of the pump light and having positive significance for improving the conversion rate of fiber amplifiers and fiber lasers.

A pulse light generation device 1 comprises: an oscillator 2 for oscillating an ultrashort pulse light L; a stretcher fiber 7 for widening the time width of the ultrashort pulse light L; a fiber amplifier 8 for amplifying the ultrashort pulse light L the time width of which has been widened by the stretcher fiber 7; and a compressor 9 for compressing the time width of the ultrashort pulse light L which has been amplified by the fiber amplifier 8. The stretcher fiber 7 is configured by combining a first fiber 71 for widening the time width of the ultrashort pulse light L with a first characteristic, and a second fiber 72 for widening the time width of the ultrashort pulse light L with a second characteristic which is different from the first characteristic.

The application discloses a quantum random number generator based on feedback adjustment of a comparator threshold value and a random sequence generation method. The quantum random number generator comprises a superluminescent diode, a filter, an erbium-doped fiber amplifier, a fiber coupler with a coupling ratio of 50:50, an optical delay line, a first beam splitter and a second beam splitter with the same splitting ratio, a first optical power meter and a first photodetector connected with the first beam splitter, a second optical power meter and a second photodetector connected with the second beam splitter, a microcontroller connected with the first optical power meter and the second optical power meter, and a comparator connected with the microcontroller, the first photodetector and the second photodetector. The first photodetector and the second photodetector are connected with the comparator through a differential circuit. The application adjusts the threshold voltage to offset the influence of the output characteristics of a light source on the output random number.

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 invention relates to the field of distributed optical fiber sensing, and discloses a Raman distributed optical fiber sensing device and method based on differential square wave chirp. In the device, laser output by a laser is modulated into square wave chirp modulated pulse light and negative square wave chirp modulated pulse light by a pulse light modulator, then the pulse light is amplified by a pulse erbium-doped optical fiber amplifier and then is divided into two beams by a coupler, one beam serves as detection light and enters a sensing optical fiber after passing through a wavelength division multiplexer, and the other beam serves as detection light after passing through a pulse erbium-doped optical fiber amplifier. Positive and negative square wave chirp modulation Raman back scattering signals generated in the sensing optical fiber are output by a wavelength division multiplexer and then are detected by a first photoelectric detector, and the other beam is directly detected by a second photoelectric detector as reference light; a detection signal is acquired by a data acquisition card and then sent to a computer for reconstruction to obtain an equivalent delta pulse Raman scattering response signal, temperature demodulation along the optical fiber is realized, and Raman distributed optical fiber temperature sensing with high spatial resolution and high system signal-to-noise ratio under a long sensing distance can be realized.

Disclosed is a pulsed laser apparatus and method of generating a laser pulse. The apparatus includes an input coupler configured to receive pumping light from a pumping light source and a seed pulse from a seed pulse generator. The apparatus further includes a doped fiber-optic cable with an input port at a first end configured to receive the pumping light and the seed pulse. The doped fiber-optic cable amplifies the seed pulse to generate an output pulse. Along a first length of the doped fiber optic cable, the pulse spectrum broadens rapidly owing to nonlinearity. Beyond the first length in an extended portion, the output pulse shifts towards longer wavelengths and broadens in both spectral and temporal domains. The apparatus also includes an output port at a second end of the doped fiber-optic cable, wherein the output pulse exits the doped fiber-optic cable at the output port.

By utilizing soliton self-frequency shift modulation, the formation of multiple pulsed light beams is suppressed, while the occurrence of ASE (Autonomous Emission Reduction) is suppressed, and the modulated pulsed light beam is reliably amplified. [Solution] The pulsed light generation device 100 comprises an oscillator 1 that oscillates pulsed light L, a fiber amplifier 2 located downstream of the oscillator 1 in the optical path of the pulsed light L, a soliton shift fiber 5 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, a branching section 8 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, and a short-wavelength fiber amplifier 11 located downstream of the soliton shift fiber 5 and the branching section 8 in the optical path of the pulsed light L.

To allow a wavelength variable light source and a wavelength variable method that can tune the wavelength of the output light to reliably amplify the light over a wide wavelength range.SOLUTION: A wavelength variable light source 1 includes an optical output unit that outputs ultrashort pulsed light L and can variably change the wavelength of the output ultrashort pulsed light L, a second fiber amplifier 7 that amplifies the ultrashort pulsed light L output from the optical output unit, a filter 8 that filters the ultrashort pulsed light L amplified by the second fiber amplifier 7, and a third fiber amplifier 9 that amplifies the ultrashort pulsed light L filtered by the filter 8. The second fiber amplifier 7 has a higher gain on the short wavelength side than on the long wavelength side. The third fiber amplifier 9 has a higher gain on the long wavelength side than on the short wavelength side. The filter 8 attenuates the amplified spontaneous emission light.SELECTED DRAWING: Figure 1

This invention relates to an image processing-based phase-sensitive optical time-domain reflectometer and signal demodulation method and system, comprising: a laser, an electro-optic modulator, an arbitrary function generator, a first circulator, a filter, a first erbium-doped fiber amplifier, a bandpass filter, a semiconductor optical amplifier, a second erbium-doped fiber amplifier, a second circulator, an optical fiber under test, a photodetector, and a data acquisition card. The method of this invention facilitates high-precision demodulation over a wide range of strain or temperature conditions with high spatial resolution. This method combines image block matching and image denoising. Image block matching utilizes multiple frequency and spatial location information, improving demodulation accuracy when strain or temperature changes are large and helping to expand the measurement range. The image denoising method denoises the matched function image, reducing random noise in the system and improving demodulation accuracy at high spatial resolution.

A fiber amplifier to amplify seed light has a laser diode, an optical fiber segment, and a doped fiber. The laser diode generates pump light at a pump wavelength from an end facet, and optical fiber segment in optical communication with the pump light has a fiber Bragg grating (FBG) configured to lock the pump light from the end facets to the pump wavelength. The pump light from the laser diode interact with an active dopant of the doped fiber and can thereby amplifies the seed light. To provide less coherent light and improve stability of the laser diode over operation conditions, variations in refractive index in the FBG have a chirped period changing linearly along a length of the FBG. The chirped period shifts the reflectivity asymmetrically from a central wavelength region of the FBG, such as blue-shifting the reflectivity for a short wavelength.

The application discloses a kind of based on functional echo wall mode optical microbottle cavity Full light tuning controllable optical comb generation method. Including 1550nm narrow line width continuous wave laser, single-mode optical fiber, erbium-doped fiber amplifier, polarization controller, optical isolator, functional microbottle cavity-fiber taper coupling system, optical attenuator, optical spectrum analyzer and 1550nm power adjustable laser. The unique axial characteristics of echo wall mode microbottle cavity are used, the free spectral range of microcavity is reduced, the axial mode microcavity optical frequency comb with small free spectral range is generated, and based on full light tuning method, functional microbottle cavity is prepared, and the axial mode microcavity optical frequency comb generated is tuned by photo-thermal material titanium dioxide, and significant spectral range tuning is realized. The application solves the limitation that WGM microcavity optical frequency comb cannot be effectively tuned due to large free spectral range, and helps the practical application in the field of microcavity optical frequency comb optical communication, optical frequency synthesis and the like.

This invention belongs to the field of fiber lasers, specifically relating to an SBS suppression module, a fiber main amplifier, and a high-power narrow-linewidth laser. The SBS suppression module includes a polarization beam combiner and a 1×2 optical switch; the fiber main amplifier consists of a double-clad gain fiber, the SBS suppression module, and accompanying passive fiber devices; the high-power narrow-linewidth laser is composed of a narrow-linewidth laser seed source, a fiber preamplifier, and a fiber main amplifier connected sequentially, with the fiber preamplifier consisting of three stages of single-clad fiber amplifiers. The SBS suppression module effectively suppresses SBS, and its simple structure facilitates packaging. This invention enables narrow-linewidth fiber laser output with high beam quality at the 5kW level and above, and employs all-fiber fusion splicing technology to construct an all-fiber system, offering advantages such as compact and simple structure, good stability, increased power, and low cost.