128 results about "Optical circulator" patented technology

The application discloses a kind of EFPI optical fiber sensor multi-sensor multiplexing temperature-pressure demodulation system and method, including ASE broadband laser, optical circulator, EFPI optical fiber sensor, 2-way wavelength division multiplexer, N-way wavelength division multiplexer, N-way wavelength division demultiplexer, photoelectric detector, FBG, 1*2 optical fiber coupler, optical spectrometer, data processing system;The input port input of the optical circulator is connected with ASE broadband laser, the output port cir2 is connected with two cascaded FBGs, the output port cir3 is connected with EFPI optical fiber sensor, the input port of 2-way wavelength division multiplexer is connected with the output port cir4 of optical circulator, and the output port is connected with N-way wavelength division multiplexer;N-way wavelength division multiplexer is accessed via the input port of 1*2 optical fiber coupler, and outputs two-way signals, one-way is connected with N-way wavelength division demultiplexer via N-way photoelectric detector and data processing system, and the other way is connected with optical spectrometer;N channels are connected by cascaded FBG, and the cascade of N EFPI optical fiber sensors is realized.

The invention discloses an on-chip fully-integrated optical circulator based on phase modulation. The on-chip fully-integrated optical circulator comprises a substrate, a buried oxide layer, an optical waveguide layer, an upper cladding and a metal layer used for manufacturing metal electrodes, the substrate, the buried oxide layer, the optical waveguide layer, the upper cladding and the metal layer are stacked, the optical waveguide layer comprises two input / output optical waveguide groups, a four-port resonant cavity and two metal electrode pairs, and the metal layer comprises four modulation areas; four ports of the resonant cavity are respectively connected with four interfaces of the modulation area, each input / output optical waveguide group is connected by a bent optical waveguide and coupled to the resonant cavity, the middle of the metal electrode pair is bent to form a coplanar waveguide electrode, and the middle of each two ends of the modulation area is connected by the coplanar waveguide electrode. The fully-integrated optical circulator is realized under the silicon-based substrate for the first time, is compatible with current mainstream optical integration platforms such as SOI, LNOI and LTOI, and can be widely applied to large-scale photonic integrated chips, such as the fields of optical communication, optical sensing, on-chip optical interconnection and the like.

The application discloses a Stokes parameter encoder, which comprises a fiber optical circulator and an optical path round trip path; a polarization maintaining fiber Faraday rotator is arranged on the optical path round trip path to rotate the polarization of light by 45 degrees; the fiber optical circulator is a polarization maintaining fiber optical circulator; the fiber optical polarization beam splitter is a polarization maintaining fiber optical polarization beam splitter; the delay fiber is a polarization maintaining delay fiber; and the fiber optical phase modulator is a polarization maintaining fiber optical phase modulator. The application further discloses a parameter encoding method of the encoder. The above technical scheme can perfectly offset the rotation angle deviation problem caused by the device, can guarantee the stability of the rotation angle regardless of the angle deviation of the device, is easy to realize the driving circuit, is easy to integrate and small in size due to the pure fiber structure, and can realize the continuous variable quantum key distribution of the complete GG02 protocol based on the Stokes encoder.

The invention discloses an all-fiber three-dimensional tomography system, which is used for performing three-dimensional tomography on an object to be observed at a high speed and comprises a light source, a first optical coupler, a first optical circulator, a first optical collimator, a first convex lens, an electric control attenuator, a second optical circulator, a second optical collimator, a second convex lens, a second optical coupler and a balance detector. The light source included in the all-fiber three-dimensional tomography system can quickly perform line or plane scanning on optical scattering media such as biological tissues and the like by utilizing a technology of capturing optical signals to obtain images and adopting an all-fiber line architecture, so as to obtain high-resolution three-dimensional images.

The application provides a semiconductor laser reservoir pool computing device based on silicon-based micro-resonant cavity optical feedback, and belongs to the technical field of photonic neuromorphic computing. Laser output by a driving laser is modulated by a phase modulator, and then is injected into a response semiconductor laser through a feedback cavity incoupler and a circulator; the output end of the response semiconductor laser is connected to an optical circulator in sequence through a second variable optical attenuator, a polarization controller, a silicon-based micro-resonator and a first variable optical attenuator, so as to form a silicon-based micro-resonator optical feedback loop; the output end of the feedback cavity incoupler is connected to a broadband photodetector, which is used to collect reservoir pool output signals; the phase modulator is loaded with a modulation signal containing an input signal and a random mask, so as to realize input layer signal coding. The application realizes the improvement of overall computing performance.

The application discloses a microwave photon filter and a control method thereof, and belongs to the field of optical fiber communication. The filter comprises an optical ring cavity, a tunable laser source, an electro-optic intensity modulator, a photoelectric detector and an electric vector network analyzer. The first input end of the electro-optic intensity modulator is connected with the output end of the tunable laser source, the second input port of the electro-optic intensity modulator is connected with the output end of the electric vector network analyzer, and the output end of the electro-optic intensity modulator is connected with the input end of an optical circulator in the optical ring cavity. The output end of the optical circulator in the optical ring cavity is connected with the input end of the photoelectric detector, and the output end of the photoelectric detector is connected with the input end of the electric vector network analyzer. The application can overcome the problem that the device parameters cannot be adjusted after the structure of the microwave photon filter is determined.

The application belongs to the technical field of optical fiber preparation automation, and specifically discloses a femtosecond laser-based optical fiber grating automatic processing and sorting system and method. The system comprises a sorting unit, a processing unit and a detection unit. The sorting unit comprises a feeder for automatically feeding optical fibers during processing, a winding machine connected with the feeder through an optical fiber and used for packaging and winding the finished optical fibers, and an industrial robot used for sorting the packaged finished optical fibers. The processing unit is arranged between the feeder and the winding machine and is used for processing optical fiber gratings. The detection unit comprises a test light source, an optical circulator, an optical spectrum analyzer and a loss module. The optical circulator is connected with the test light source, the optical spectrum analyzer and the optical fiber on the feeder. The loss module is arranged between the processing unit and the winding machine and blocks the propagation of test laser emitted by the test light source in the optical fiber through a bent optical fiber. The control unit is in communication connection with the processing unit, the sorting unit and the detection unit and is used for realizing optical fiber grating automatic processing and sorting.

To provide an optical transmission device, an optical transmission system, and an optical transmission method that suppress an OSNR penalty due to return light.SOLUTION: An optical transmission device disposed at a fiber end of a single-core optical fiber and used when signal light is bidirectionally transmitted through the optical fiber, the optical transmission device comprising an optical transmitter configured to transmit first signal light in one direction belonging to the signal light, an optical receiver configured to receive second signal light in a reverse direction belonging to the signal light, and a controller configured to guide the first signal light transmitted from the optical transmitter to the optical fiber, An optical circulator configured to guide the second signal light from the optical fiber to the optical receiver; and a light source configured to output, to the optical fiber, excitation light that Raman-amplifies the second signal light to second optical power higher than first optical power of the first signal light.SELECTED DRAWING: Figure 2

A temperature strain separable dynamic and static combined measurement distributed optical fiber sensing system, comprising: laser, optical modulator, radio frequency signal generator, optical filter, DFB laser, polarization controller, first acoustooptic modulator, depolarizer, erbium-doped fiber amplifier, two optical circulators, optical wavelength division multiplexer, receiving module, signal acquisition and processing module are arranged in sequence, the application carries out temperature sensing to the back Raman scattering light of the pulse while receiving the Rayleigh scattering light of the detection pulse, and controls the time interval of adjacent pump pulse and detection pulse to carry out three-bit pulse coding and decoding, so that the back Raman scattering signals of individual pulse in pulse pair are separated in time, and finally the simultaneous measurement of dynamic variable (vibration) and static variable (temperature, static strain) is realized and the spatial resolution of measurement is ensured not to be lost.

The invention discloses a time delay reserve pool calculation method based on dispersion orthogonal polarized light feedback VCSEL. An adopted time delay RC system comprises a tunable laser, a Mach-Zehnder modulator, a VCSEL, an optical isolator, an optical coupler, a polarization controller, a variable optical attenuator, a chirp fiber Bragg grating and a photoelectric detector. A signal of the input layer is modulated by a Mach-Zehnder modulator and then is injected into an X polarization component of the VCSEL of the reserve pool layer; emitted light of the VCSEL is divided into two paths after passing through the optical circulator, one path is reflected back to the VCSEL by the chirp fiber bragg grating after being subjected to cross-polarization rotation through the polarization controller, and a reserve pool layer of the time delay RC system is constructed; one path is transmitted to the output layer and is converted into an electric signal through a photoelectric detector. According to the method, the time delay characteristic can be further inhibited, so that generation of harmful resonance is further inhibited, and the method has stronger nonlinear characteristic and better calculation performance.

The invention provides a parameter measurement device and method for a terahertz wave beam, and the device comprises a laser signal generation module which is used for generating a combined laser signal; the to-be-tested terahertz continuous wave radiator outputs a terahertz continuous wave signal based on the combined laser signal; the scanning modulation module is used for carrying out beam scanning and modulation on the terahertz continuous wave signal based on the combined laser signal to generate a reflected laser signal; the optical circulator is used for outputting the combined laser signal to the scanning modulation module and outputting the reflected laser signal to the current signal generation module; the current signal generation module generates a current signal based on the reflected laser signal; and a control and data processing module. The parameter measuring device of the terahertz wave beam is based on all-fiber detection, does not need a spatial light path system which is large in size and difficult to adjust, is high in integration level and simple to operate, can realize non-intrusive terahertz wave beam near-field measurement, and can realize ultra-wideband terahertz wave beam measurement.

The invention belongs to the technical field of lasers. The invention provides an all-fiber laser with adjustable pulse width and a pulse width tuning method. The all-fiber laser comprises a narrow-band dissipation soliton mode-locked fiber laser seed source, a first fiber isolator, a fiber amplifier, a second fiber isolator, an optical circulator and a dispersion element which are sequentially arranged along a light path. The seed source generates a mode-locked pulse with a fixed initial spectral width; the nonlinear effect intensity is controlled by adjusting the driving current of the pumping source, so that the spectrum broadening amount of the pulse in the amplification process is regulated and controlled, the variable total spectrum width is formed, the spectrum width is subjected to linear time-frequency mapping through a dispersion element with a fixed group delay dispersion value, and finally continuous and electric control adjustment of the output pulse width is achieved. The whole system adopts an all-fiber structure, has the advantages of high stability, compact structure, good tuning linearity and the like, and is suitable for industrial processing, sensing and scientific research application scenes needing flexible pulse width regulation and control.

an optical intensity modulation device (100) comprising: an optical modulator (102) operative to modulate a continuous wave optical carrier signal at a carrier wavelength to generate one or more sidebands on the optical carrier signal; a radio frequency (RF) signal generator (104) operative to provide an RF drive signal to the optical modulator; a first optical waveguide grating (108) having a center reflection wavelength corresponding to the sidebands; and an optical circulator (106) configured to direct the optical carrier signal and the one or more sidebands into the first optical waveguide grating and to direct a reflected optical signal from the first optical waveguide grating towards an output to form an output optical signal, wherein the RF signal generator is operative to switch the drive signal on and off to form an intensity modulated output optical signal.

According to the optical transceiver assembly, the optical fiber connector and the optical module provided by the invention, lenses are arranged at three ports of an optical circulator, so that multiple beams of laser emitted by multiple optical ports of a sending end can be collimated into collimated light through the lenses, and the multiple beams of collimated light share the optical circulator for optical path propagation. The number of optical circulators in the optical transceiver assembly is reduced, and miniaturization design of the optical transceiver assembly is facilitated.

The present invention provides an integrated distributed optical fiber sensing system comprising: an on-chip integrated laser (1), an injection locking unit (3), a distributed feedback laser (2), a semiconductor optical amplifier (5), an optical circulator (6), a sensing optical fiber (7), and a coherent detection unit (4), wherein the on-chip integrated unit (10a) is obtained by on-chip integration of the injection locking unit (3) and the coherent detection unit (4).

This invention provides a low-crosstalk signal demodulation device and method for fiber optic laser communication, belonging to the field of fiber optic communication technology. The device includes a fiber optic signal input port, an optical circulator, a polarization beam splitter / combiner module, a balanced photodetector unit, a low-noise amplification and quadrature demodulation module, an adaptive crosstalk cancellation unit, a MIMO equalization and decision unit, and a digital signal output port, connected in series according to the signal flow direction. It also includes a crosstalk monitoring and feedback unit bidirectionally connected to the low-noise amplification and quadrature demodulation module, the adaptive crosstalk cancellation unit, and the MIMO equalization and decision unit. This invention, employing the aforementioned low-crosstalk signal demodulation device and method for fiber optic laser communication, overcomes the limitations of traditional single-domain crosstalk suppression. Through the synergistic effect of optical path, circuit, and algorithm layers, it effectively suppresses crosstalk caused by multi-channel multiplexing, polarization mode dispersion, and backscattering, significantly improving demodulation accuracy, anti-interference capability, and system stability.

The invention provides a photoelectric oscillator capable of being used for generating tunable phase coding microwave pulses. The photoelectric oscillator is composed of a tunable laser, a polarization controller, a phase modulator, a dual-drive Mach-Zehnder modulator, an optical circulator, a phase shift fiber bragg grating, a single-mode fiber, a photoelectric detector, an electric amplifier, a microwave source and an arbitrary waveform generator. The invention develops the active mode-locked photoelectric oscillator for generating the phase-coded microwave pulse signal, which is simple in structure and good in tunability. On the basis of an active mode-locked optoelectronic oscillator, a phase modulator is driven by a phase coding signal, so that the duration of each voltage polar code is kept consistent with the loop delay of the optoelectronic oscillator, and a phase-coded coherent microwave pulse sequence is generated. The signal has the advantage of large time bandwidth product, can give consideration to the detection distance and distance resolution of the radar, and has the characteristics of interference resistance, low interception and the like.

The application discloses a dense optical fiber coding method based on an optical switch and a weak reflectivity grating string, and comprises the following steps: 1, a light source module emits a C-band pulse signal, and the signal contains optical pulses with different central wavelengths and overlapping in a time domain; 2, a weak reflectivity grating string is used to code each node to obtain different wavelength pulse combination types, and the coding signals of different coding nodes on the same link are spaced apart in the time domain; 3, the coding signal is injected into an array waveguide grating through an optical circulator, and is decomposed into more than one single-wavelength pulse signal; 4, a detector array and a collection card are used to carry out photoelectric conversion on the coding pulse signal, and the collected signal is output to an FPGA and an upper computer for processing and display; the problems that the prior art cannot be applied to realize real-time coding of a large-scale and high-reliability all-optical network and that the real-time coding scale is limited and cannot meet the use requirements of a large-scale network are solved.

The invention provides a substrate deformation measurement system based on a fiber bragg grating (FBG) and a self-adaptive layout method thereof. The substrate deformation measurement system comprises an FBG sensor network, a data acquisition module, a signal preprocessing and data analysis processing module and a visual interface, the FBG sensor network comprises a measured substrate and a fiber grating string; the data acquisition module comprises a tunable broadband light source, an optical isolator, an optical circulator, a signal transmission optical fiber, a spectrum analyzer and a corresponding demodulation algorithm; the signal preprocessing and data analysis processing module comprises hardware equipment and computer software; and the visual interface uses Labview to write a front-end interface, and is used for performing three-dimensional real-time display on a substrate shape reconstruction result and realizing an alarm function for special situations. According to the invention, through fusion of real-time data and a prior model, focusing monitoring and resource optimization configuration of a key area are realized, and the problems of high calculation complexity, low data processing efficiency and the like in a traditional distributed fiber grating morphology sensing technology are solved.

The invention discloses a hybrid integrated correction-free linear frequency modulation DFB laser ranging system and a ranging method thereof, and relates to the technical field of laser radar ranging. Comprising a hybrid integrated packaging module, a first DFB laser, a second DFB laser, an optical circulator unit, a GPPO high-frequency radio frequency interface and an independent regulation and control unit, the first DFB laser, the second DFB laser and the optical circulator unit are packaged in the hybrid integrated packaging module, and the GPPO high-frequency radio frequency interface is arranged on the hybrid integrated packaging module; according to the hybrid integrated correction-free linear frequency modulation DFB laser ranging system and the ranging method thereof, the sweep frequency linearity of the laser is directly anchored on a radio frequency source of an electric domain through a physical mechanism of sideband locking, so that the sweep frequency linearity of output optical frequency is ensured from the physical level; a complex digital pre-distortion algorithm or expensive photoelectric phase-locked loop hardware is thoroughly omitted, and the system complexity is greatly reduced.

The utility model relates to a kind of QSFP Bidi optical device for enterprise network, the transmission light wavelength range of TX end is different and not overlapped with the receiving light wavelength range of RX end;TX optical fiber between TX end and LC adapter is coupled with a narrowband filter, RX optical fiber between RX end and narrowband filter is coupled with a reflection prism, narrowband filter transmits the transmission light of TX end;Narrowband filter total reflection is received to the receiving light emitted from LC adapter, and let receiving light be coupled into the RX optical fiber of RX end by reflection prism reflection.A kind of enterprise network optical communication system, LC adapter in QSFP Bidi optical device is coupled with optical distribution unit by single-fiber bidirectional optical fiber, and optical distribution unit is coupled with multiple SFP optical devices respectively.Affirmative effect is that: cheap narrowband filter+reflection prism can be used to replace expensive optical circulator, effectively reduce cost, performance is promoted, it is easy to package into module, optical insertion loss is small.

Integrated optical circulators that enable polarization diversity are disclosed. A photonic integrated circulator (200) can be fabricated by including multiple polarization beam splitters (220, 222) and optical polarization rotators (230, 232, 234) such that two copies of an optical signal are output at a receiver in substantially aligned polarization states. The circulator (200) can be used to facilitate bidirectional communication between photonic integrated circuit devices that are inherently polarization sensitive while reducing signal loss.

The invention discloses a distributed magnetic field sensing system and method based on a magnetic domain regulation FBG array and deep learning-Kalman filtering demodulation, and belongs to the technical field of optical fiber sensing and magnetic field measurement. The system comprises a tunable laser, an optical circulator, a magnetic domain regulated FBG sensing array, an OFDR module, a data acquisition module and a signal processing unit. The core is that the FBG sensing array enables each FBG to have different magnetic field sensitivity and measuring range through a differential magnetic domain regulation and control technology; and the signal processing unit adopts a deep learning algorithm to process an OFDR signal, and performs dynamic optimal estimation in combination with Kalman filtering, so that high-precision and wide-range distributed magnetic field measurement is realized, and meanwhile, temperature cross sensitivity is effectively decoupled. The invention solves the problem that the prior art cannot consider the measurement range, precision and anti-interference capability at the same time, and is especially suitable for magnetic field monitoring in complex environments such as transformers and space detection.

We provide a light circulator that allows for easy detection of damage. [Solution] The device includes a first port P1 into which light is incident, a second port P2 from which light incident from the first port P1 is emitted, a third port P3 from which light incident from the second port P2 is emitted, a first polarizer 5 and a second polarizer 6 located on the first port P1 side, a third polarizer 7 located on the second port P2 side and positioned together with the first polarizer 5 to sandwich the second polarizer 6, a Faraday rotator 8 located between the first polarizer 5 and the second polarizer 6, and a half-wave plate 9 located between the second polarizer 6 and the third polarizer 7, and includes a light emission unit 3 into which a portion of the light incident from the first port P1, passing through the first polarizer 5, the Faraday rotator 8, the second polarizer 6 and the half-wave plate 9, and incident on the third polarizer 7 is reflected and emitted as reflected light.

The application discloses a kind of sensing system and method based on optical fiber point type / distributed coordination, it is related to optical fiber sensing technical field, including: fusion light source module, optical circulator, point / combination sensing optical fiber module, point / distributed optical fiber sensing signal separation module, signal detection and demodulation module, to be measured parameter calculation module and data fusion and analysis module.Fusion light source module contains distributed sensing light source and point type sensing light source, two kinds of light sources are coupled and are injected into point / combination sensing optical fiber by optical circulator;After scattering light and reflected light returned are separated by point / distributed optical fiber sensing signal separation module, are respectively demodulated by corresponding demodulation unit, are fused after demodulation mapping and analysis;The application realizes the organic fusion of the full domain continuous monitoring of distributed sensing and the high-precision measurement of key position of point type sensing on single optical fiber, realizes multidimensional multi-parameter high-performance sensing of full coverage, key highlight.

This invention discloses a device for real-time analysis of multidimensional information of spatiotemporally mode-locked pulses using an all-fiber structure, belonging to the field of ultrafast optics technology. It includes an all-fiber spatiotemporally mode-locked laser platform, a raw pulse beam profile measurement module, an optical circulator, a sub-pulse beam profile measurement module, and a dispersive Fourier transform and real-time spectral information detection module. Based on the generalized multimode nonlinear Schrödinger equation, this invention constructs a theoretical model of the spatiotemporally mode-locked laser, explores the multidimensional parameter coupling mechanism during spatiotemporal mode-locking, clarifies the mapping relationship between modes and frequencies, and provides a theoretical basis and method for high-precision mode differentiation and multidimensional real-time information extraction. This invention aims to rationally design the parameters of each fiber grating according to the spectral width and temporal interval of the spatiotemporally mode-locked pulse, reflecting more sub-pulses while ensuring that the pulse temporal domains do not overlap, achieving high-precision spatial mode resolution, and maximizing pulse broadening to obtain high-resolution real-time spectral information.

The invention relates to a spatial domain measurement distributed optical fiber acoustic wave sensing system and a measurement method thereof, the system comprises a light source, and an optical phase modulator, an optical amplifier, an optical circulator and an optical fiber for distributed sensing which are sequentially arranged on a light path of incident light of the light source, and the optical circulator is also located on a light path of light returned from the full length range of the optical fiber. The optical circulator is sequentially connected with a photoelectric detector, a data acquisition card and a computer on the light path of the return light; the optical phase modulator comprises a first radio frequency source, a second radio frequency source, a first electronic switch, a second electronic switch, a frequency mixer and an acousto-optic modulator. According to the invention, a double heterodyne pulse modulation injection technology is combined with a spatial domain phase demodulation method, so that continuous distributed synchronous measurement of a vibration field / sound wave field in a full length range of the optical fiber is realized, and the sensing precision and the spatial resolution are remarkably improved; the core requirements of geophysical exploration, energy industry monitoring, large-scale structure health monitoring and other scenes on spatial domain signal analysis can be met.

This invention relates to distributed fiber optic sensing systems. A phase-tunable three-terminal coupled φ-OTDR measurement device based on a Sagnac interferometer is disclosed, comprising: a first pulsed light source, a first optical circulator, a sensing fiber, a continuous fiber amplifier module, a second optical circulator, a 3×3 optical coupler, a Sagnac ring, a semiconductor optical amplifier, a 1×2 optical coupler, a second pulsed light source, a second acousto-optic modulator, a first photodetector, a second photodetector, a third photodetector, and a data acquisition card. This invention achieves phase demodulation of different vibration signals by setting a semiconductor optical amplifier in the Sagnac ring and adjusting the phase difference between two signals by regulating the intensity of the control beam. Furthermore, it effectively avoids the problem of reduced spatial resolution caused by path difference between two signals in Michelson or Mach-Zehnder interferometers.

The utility model discloses a kind of double-parameter optical fiber laser sensors based on Sagnac ring cascaded liquid phase filling MZI, belong to optical fiber sensor technical field, by LD pumped laser source (1), wavelength division multiplexer (2), holmium-doped optical fiber (3), optical circulator (4), sensing probe A (5), first coupler (6), sensing probe B (7), second coupler (8), optical spectrum analyzer (9), first single-mode optical fiber (501) polished in side edge, large core diameter hollow optical fiber (502) fills PDMS (503), few-mode optical fiber (504), fiber bragg grating (505), second single-mode optical fiber (506), third single-mode optical fiber (701), first panda polarization maintaining fiber (702), second panda polarization maintaining fiber (703), fourth single-mode optical fiber (704);The utility model can effectively improve the sensitivity of device to temperature by hollow optical fiber filling PDMS;By panda polarization maintaining fiber rotation shaft fusion splicing makes that interference phase difference amplification, spectral line drift is more obvious, so improve the sensitivity of device to temperature;Different reflection peak signals of few-mode optical fiber grating and Sagnac interference spectrum signals can establish sensitivity matrix to realize double-parameter measurement to temperature and strain, with excellent reliability and stability.

This invention discloses an integrated dual-mode-locked fiber laser source for dual-comb measurements, comprising: a pump source, a wavelength division multiplexer (WDM), a rare-earth ion-doped fiber, a first optical circulator, and a second optical circulator. The pump source is coupled to the rare-earth ion-doped fiber via the WDM. The first and second optical circulators are respectively connected to the two ends of the rare-earth ion-doped fiber. The first optical circulator forms a first resonant cavity with a first group of mode-locking elements, and the second optical circulator forms a second resonant cavity with a second group of mode-locking elements. The first and second resonant cavities are optically isolated from each other by the directional transmission characteristics of the first and second optical circulators, and share the pump source and the rare-earth ion-doped fiber to synchronously output two mode-locked pulses. This invention can generate two highly coherent mode-locked pulses with independently adjustable parameters using a single pump source and a single gain medium, exhibiting high integration, good stability, and strong practicality.