324 results about "Optical circulator" patented technology

The invention relates to a phase-sensitive optical time domain reflectometer based on multi-frequency reference switching. Continuous laser generated by a continuous laser is divided into a local path and a detection path through an optical coupler; the local path is input to the polarization coherent receiving module, the detection path is incident to a light intensity modulator driven by the signal generation circuit module, and the light intensity modulator is converted into a multi-frequency pulse laser sequence with intensity modulation; the multi-frequency pulse laser sequence enters the sensing optical fiber to be measured through the optical circulator; generated Rayleigh backscattered light and local continuous laser are subjected to beat frequency coherent receiving in a polarization coherent receiving module through a circulator; and the signal acquisition circuit adopts a demodulation algorithm to compensate phase drift and sensitivity difference of detection pulse demodulation signals with different frequencies so as to realize dynamic strain sensing. Compared with the prior art, the phase drift and the sensitivity difference between the frequencies are extracted to realize the compensation of the interleaved signals, and the method does not depend on the fixed reference frequency, so that the robustness and the adaptability of the system in a complex environment are remarkably enhanced.

According to embodiments of the present invention, a parallel scanning confocal microscope is provided. The microscope includes an optical circulator including a first port, a second port and a third port; a light source optically coupled to the first port; an optical arrangement in optical communication with the second port; a focusing lens; and a photodetector optically coupled to the third port. The light source may be configured to emit light towards the optical arrangement along an illumination path. The light may be directed as multiple optical beams towards the focusing lens, which may be configured to focus the beams to confocally and simultaneously illuminate a sample along the illumination path; and to collect light reflected from the sample confocally along a reflection path. The reflected light may be directed towards the photodetector along the reflection path. According to further embodiments, a parallel scanning confocal microscopy method is also provided.

The utility model relates to a high-capacity wavelength division multiplexing fiber bragg grating sensing system in the field of fiber sensing. The high-capacity wavelength division multiplexing fiber bragg grating sensing system comprises a mode-locked fiber laser, a spectrum expansion module, a three-port optical circulator, a fiber bragg grating array, a dispersion module, a photoelectric detector, a data acquisition module and a data processing module. The spectrum expansion module is composed of an optical fiber amplifier, a nonlinear element and a polarization controller; the optical fiber amplifier is composed of an optical isolator, an erbium-doped optical fiber, a wavelength division multiplexer and a pump light source. According to the sensing system, the dispersion Fourier transform technology is applied, the offset of the center wavelength of the fiber bragg grating is mapped into the offset of time delay between time domain reflected light pulses, and the demodulation rate and precision of the fiber bragg grating sensing system are improved; and by adding a spectrum expansion module, the spectrum of pulse data output by the light source laser is expanded into a super-continuum spectrum by using a nonlinear effect, and the simultaneous measurement of hundreds of fiber bragg grating sensors can be theoretically supported.

The present invention provides a non-contact optical fiber sensing system and method. The system includes a passive fiber Bragg grating sensor and an active demodulation analyzer. The passive fiber Bragg grating sensor includes an optical fiber and a fiber Bragg grating sensor connected in series on the optical fiber. The active demodulation analyzer includes a laser light source, an optical circulator, and a demodulation analyzer. One end of the passive fiber Bragg grating sensor is connected with a first fiber collimator. The active demodulation analyzer further includes a second fiber collimator and an alignment mechanism. The laser light source is connected to the first end of the optical circulator for outputting an optical signal. The optical fiber led out from the second end of the optical circulator is connected with the second fiber collimator. The second fiber collimator is used for non-contact alignment with the first fiber collimator under the adjustment of the alignment mechanism so as to transmit the optical signal bidirectionally. The demodulation analyzer is connected to the third end of the optical circulator. The present invention can expand the application scenarios of the optical fiber sensing system and save costs.

Provided are polarization-mode controlled nonreciprocal optical waveguide devices, which are used in optical isolator and optical circulator devices. These devices offer a solution to the issues associated with traditional planar optical waveguide-based optical isolators, which are specific to a single polarization mode and result in significant optical loss. The new devices implement polarization-insensitive operation with minimal optical loss. They feature a magneto-optic (MO) film clad on one side and utilize waveguide mode converters or polarization-mode converters to guide the input light signals' mode or polarization. This reduces optical loss as the light passes through the interface between the non-MO clad region and the MO clad region and maximizes the MO effect within the MO clad region by ensuring proper polarization mode.

According to the distributed fiber grating sensor provided by the invention, the optical pulse and the broadband laser are emitted in a time-sharing manner through the integrated composite light source module, and the cooperative monitoring of Raman scattering temperature measurement and Bragg grating stress measurement is realized on the same sensing optical fiber in combination with the optical path design of the wavelength division multiplexer and the optical circulator. According to the scheme, the high-temperature adaptability of the Raman scattering effect, namely a stable linear relation between molecular vibration frequency shift and temperature, is utilized, signals and stress are completely decoupled, the problem of cross sensitivity of a traditional single sensor is avoided, and independent measurement can be achieved without temperature compensation; meanwhile, a distributed measurement mode enables the sensor to still perform high-precision synchronous monitoring on temperature and stress in a high-temperature environment of 600-900 DEG C, so that the measurement process in an industrial complex scene is simplified, and the system reliability is improved.

Birefringence in optical fibers is mitigated using optical frequency domain reflectometry (OFDR) having a coupling point optically connected to a reference arm with a first, single mode fiber segment and optically connected to a measurement arm having single mode optical segments and polarization maintaining optical segments. The measurement arm has a first optical circulator connected to the coupling point via a second, single mode fiber segment; a second optical circulator for sending optical radiation to a sensor; a single mode optical segment between the first optical circulator and the second optical circulator including a third, single mode fiber segment. The measurement arm has an outbound path including a first polarization maintaining optical segment between the first and second optical circulator for rotating a polarization of the optical radiation once relative to a second polarization maintaining optical segment between the first and second optical circulator.

This invention relates to a Bragg light generation system and method suitable for Bragg-type atomic interferometers. The system includes: a laser for generating a first laser beam with a frequency in a preset atomic absorption peak band; an optical circulator for propagating the first laser beam to a cascaded acousto-optic modulator and receiving two third laser beams returned from the cascaded acousto-optic modulator; a cascaded acousto-optic modulator for diffracting the first laser beam into two second laser beams with opposite propagation directions through Bragg diffraction of two acousto-optic crystals; an optical assembly for performing secondary diffraction on the two second laser beams and reflecting the two mutually perpendicular second laser beams to the cascaded acousto-optic modulator; and an output module for splitting and sampling the two third laser beams and modulating the sampled third laser beams into Bragg laser beams in the target frequency band. This invention reduces the path separation of the two Bragg laser beams by using a quasi-common optical path, thereby reducing phase noise and improving measurement accuracy.

The invention discloses a system for eliminating fading noise in a distributed optical fiber sound wave sensing system. The system comprises a light source, an optical frequency shift modulator, an optical amplifier, an optical circulator, a photoelectric detector, a data acquisition card and a data demodulator, laser emitted by the light source is modulated into double-pulse light with frequency difference through the light frequency shift modulator, the double-pulse light is injected into the optical fiber through the optical circulator after being amplified by the optical amplifier, Rayleigh backscattered light generated in the optical fiber is emitted back to the optical circulator, light emitted by the optical circulator is detected and converted into an electric signal through the photoelectric detector, and the electric signal is transmitted to the optical fiber through the optical circulator. The electric signals are collected and converted into digital signals through the data collection card, and the data demodulator demodulates the digital signals through a fading noise elimination method to obtain signals with fading noise eliminated. Therefore, fading noise in the distributed optical fiber acoustic wave sensing system can be effectively eliminated, the signal quality is improved, and error signal interference is eliminated.

The invention discloses a nonlinear chirped fiber grating preparation structure based on speed regulation and control, and belongs to the field of laser technology and nonlinear optics. Comprising a light source displacement control scheme, a phase mask plate displacement control scheme and a grating inscribing and monitoring scheme. The optical, electrical and mechanical devices comprise a laser light source, a diaphragm, a plano-concave mirror, a plano-convex mirror, a cylindrical lens, an electric control displacement platform, a control program, a signal generator, a function editor, a precise displacement platform, an optical isolator, an optical circulator, a photosensitive optical fiber and an optical fiber analyzer. According to the non-linear chirp fiber grating preparation scheme based on speed regulation and control, the adjustable displacement speed is introduced while the uniform phase mask plate is used, flexible chirp regulation and control are achieved while simple and stable preparation is guaranteed, the preparation scheme of the non-linear chirp tube fiber grating is widened, and the preparation cost is reduced.

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.

A homodyne detection Doppler wind measurement laser radar device based on a silicon optical chip comprises a light source module, a photoelectron chip module, a semiconductor optical amplifier, an erbium-doped optical fiber amplifier, an optical circulator, an optical transceiver antenna, a transimpedance amplifier processing module, an A / D acquisition card module, a digital signal processing module and a display and storage module. Discrete devices such as a beam splitter, a frequency mixer and a detector in an optical fiber link are integrated on one chip, high-density integration with other components is carried out through the photoelectric hybrid packaging technology, and chipping and miniaturization of the all-optical-fiber wind finding radar are achieved. The semiconductor optical amplifier (SOA) is used for chopping, a homodyne detection method is used for eliminating the requirement for frequency shift, and compared with a traditional Doppler wind measurement laser radar, the Doppler wind measurement laser radar has the advantages of being small in power consumption, small in size, light in weight, high in integration level, convenient to produce in a large scale, low in cost of a single device and the like.

The invention belongs to the technical field of optical gas sensing, and provides an optical fiber microcavity gas sensing system and method based on photoacoustic excitation and detection enhancement. The sensing system comprises a narrow linewidth laser light source, a wide-spectrum detection light source, a wavelength division multiplexer, an optical circulator, a high-speed spectrometer, a signal processing circuit, a single-mode optical fiber and an embedded single-optical-fiber photoacoustic sensing probe. The novel structure is characterized in that the partially gold-plated optical fiber is embedded into the gold-plated opto-acoustic micro-cavity to form a miniature optical'cage ', so that multiple reflections of light in a free space are realized. In addition, in order to make full use of the high sensitivity of the silicon cantilever beam in photoacoustic detection, the structural design of the embedded single optical fiber for expanding the inner cavity reduces the pressed film damping of the silicon cantilever beam during resonance. According to the embedded single-optical-fiber photoacoustic sensor, the multi-pass photoacoustic microcavity and the ultra-sensitive optical fiber microphone are applied, so that double enhancement of photoacoustic excitation and detection is realized, and the gas detection precision is improved.

The invention discloses a distributed optical fiber two-dimensional vector sensing system and method, the system uses an acousto-optic modulator group and an optical circulator group to ask a plurality of fiber cores of a multi-core optical fiber in parallel, heterodyne coherent detection uses local oscillator light to improve the signal-to-noise ratio, and through the relation between the fiber core position difference and the direction angle of a two-dimensional sound wave in the aspect of algorithm, the two-dimensional sound wave direction angle is obtained. According to the space division multiplexing distributed optical fiber acoustic sensing system, a two-dimensional vector signal is accurately restored, the measurement vector angle range of the space division multiplexing distributed optical fiber acoustic sensing system for two-dimensional sound waves is 0-360 degrees, the vector sensing range is larger than 50 km and far exceeds that of an existing system, and the detection capacity of the distributed optical fiber acoustic sensing system is greatly improved.

The invention discloses an OPGW optical cable lightning stroke positioning monitoring system and monitoring method based on distributed optical fiber sensing. Comprising a DFB laser, a first optical coupler, an acoustic optical modulator, a pulse signal generator, a scrambler, a first EDFA optical amplifier, a first optical isolator, an optical circulator, an FBG filter, an OPGW sensing optical cable, an electro-optical modulator, a microwave signal generator, a polarization regulator, a second EDFA optical amplifier, a second optical isolator, a second optical coupler and a variable optical attenuator which are connected in sequence. A third optical coupler, a balance detector, a low-frequency amplifier and a data processing module. The system can quickly and accurately position the lightning stroke position of the OPGW optical cable by measuring the Brillouin scattering frequency shift and the vibration state of the scattering signal.

The invention relates to the technical field of optical fibers, and provides a device and method for measuring size structure parameters of a hollow-core optical fiber, and the device comprises a light source transmitting end (11), an optical circulator (12), a spectrometer (13), and a rotary displacement platform (14). The light source emitting end (11) is connected with a first port (1) of the optical circulator (12), a second port (2) of the optical circulator (12) is aligned with the side surface of a to-be-detected hollow-core optical fiber (15) of which a coating layer is stripped, the to-be-detected hollow-core optical fiber (15) of which the coating layer is stripped is arranged in the rotary displacement table (14), and a third port (3) of the optical circulator (12) is connected with the spectrograph (13); the to-be-tested hollow-core optical fiber (15) is a band-gap hollow-core optical fiber or an N-layer nested anti-resonance hollow-core optical fiber, and N is a positive integer; the detection device is simple in composition, and the detection method is convenient to operate, simple in calculation and good in measurement accuracy.

The invention belongs to the technical field of photoacoustic spectrum gas sensing, and discloses an optical fiber photoacoustic gas sensing system and method for inhibiting environmental noise interference. The system comprises a narrow linewidth laser, a double-core optical fiber, a symmetrical optical fiber photoacoustic sensing probe, a wide-spectrum detection light source, an optical circulator, a spectrograph and a control circuit. The air cavities on the two sides of the symmetrical optical fiber photoacoustic sensing probe are consistent in structure and opposite in direction, and the vibration states of the diaphragms are mutually counteracted to keep stable by utilizing the characteristic that external noise coupled into the air cavities on the two sides of the probe has the same amplitude but opposite phases on the acting force of the cantilever type sound wave sensitive diaphragms, so that the effect of resisting external noise interference is achieved. The single cantilever type sound wave sensitive diaphragm is used as a signal sensing element and is also used for noise elimination, and a traditional structure and a signal processing process based on a double-cantilever differential noise reduction scheme are simplified. The scheme of the invention has the advantages of simple structure, high sensitivity, fast response speed and strong stability in a strong noise environment.

The invention relates to a Bragg light generation system and method suitable for a Bragg atom interferometer, and the system comprises a laser device which is used for generating first laser with the frequency on a preset atomic absorption peak frequency band; the optical circulator is used for transmitting the first laser to the cascade acousto-optic modulator and receiving two beams of third laser returned by the cascade acousto-optic modulator; the cascade acousto-optic modulator is used for diffracting the first laser into two beams of second laser with opposite propagation directions through Bragg diffraction of the two acousto-optic crystals; the optical assembly is used for carrying out secondary diffraction on the two beams of second laser and reflecting the two beams of second laser which are obtained through diffraction and are perpendicular to each other to the cascade acousto-optic modulator; and the output module is used for carrying out light splitting sampling on the two beams of third laser and modulating the sampled third laser into Bragg laser of a target frequency band. According to the invention, path separation of the two Bragg laser beams is reduced through quasi-common-path, so that phase noise is reduced, and measurement precision is improved.

The invention discloses a temperature detection method and system based on a fiber grating temperature sensor, low coherence light emitted by an SLD broadband light source is divided into first signal light and second signal light after passing through a coupler, the first signal light forms reference light, and the reference light is sent to an upper computer after being collected by a photoelectric detector; after the second signal light enters the fiber bragg grating temperature sensor through the optical circulator, part of the second signal light is reflected by the fiber bragg grating temperature sensor and returns to the optical circulator along the original path to form reflected light, and the reflected light is collected by the photoelectric detector and then sent to the upper computer; the other part of the second signal light penetrates through the fiber grating temperature sensor to form transmission light, and the transmission light is collected by the photoelectric detector and then sent to the upper computer; and the upper computer processes the reference light, the reflected light and the transmission light, calculates the power of the reference light, the power of the reflected light and the power of the transmission light, and obtains the corresponding real-time temperature from a pre-trained power-temperature relation table.

The invention discloses a narrow linewidth fiber laser based on random distribution feedback loop self-injection locking, and relates to the technical field of fiber lasers. The wavelength division multiplexer, the erbium-doped optical fiber, the optical band-pass filter, the optical coupler I, the optical coupler II, the polarization controller and the optical isolator are sequentially connected end to end to form an annular cavity, the pumping source is connected with the wavelength division multiplexer, and the random distribution feedback structure is connected with the optical coupler III to form an optical fiber ring to form a random distribution feedback ring. A first port and a third port of the optical circulator are connected with the first optical coupler and the second optical coupler respectively to form a self-injection structure, a second port of the optical circulator is connected with the third optical coupler, and the remaining output end of the second optical coupler serves as the output end of the annular cavity. The laser frequency drift of the annular cavity can be reduced by utilizing the random distribution feedback ring, the effective length of the random distribution feedback structure is increased by increasing the round-trip times of optical signals, a narrow-band gain peak can be ensured, stable narrow-linewidth single-frequency laser output can be obtained, and the linewidth narrowing efficiency and the environmental sensitivity are improved.

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 invention discloses single-photon non-destructive measurement equipment based on a micro-ring resonant cavity, and the equipment comprises a signal light input waveguide, a signal light output waveguide, a detection light input waveguide, a detection light output waveguide, a first optical circulator, a second optical circulator, a linear waveguide, the micro-ring resonant cavity, and a three-level quantum emitter. The first ends of the signal light input waveguide, the probe light output waveguide and the linear waveguide are respectively connected to the first optical circulator, the second ends of the signal light output waveguide, the probe light input waveguide and the linear waveguide are respectively connected to the second optical circulator, and the micro-ring resonant cavity is coupled with the linear waveguide. And the three-level quantum emitter is coupled with the micro-ring resonant cavity. The method is high in measurement efficiency and high in measurement precision.

A lidar system, including: a laser, an optical detector, a laser antenna, and a silicon-based integrated magneto-optical circulator. The silicon-based integrated magneto-optical circulator includes a silicon-based integrated Mach-Zehnder interference structure or a silicon-based integrated micro-ring structure, and silicon-based integrated magneto-optical waveguides. The silicon-based integrated magneto-optical circulator further includes an input port, a receiving port, and an emission port. The laser is aligned and coupled to the input port of the silicon-based integrated magneto-optical circulator via an optical fiber, a grating coupler, or an edge coupler. The optical detector is aligned and coupled to the receiving port of the silicon-based integrated magneto-optical circulator via the optical fiber, the grating coupler, or the edge coupler. The laser antenna is aligned and coupled to the emission port of the silicon-based integrated magneto-optical circulator via the optical fiber, the grating coupler, or the edge coupler.

The present invention relates to an optical fiber acoustic sensor with improved acoustic signal measurement sensitivity, and includes: a light source unit that generates and outputs pulsed light; an optical circulator that outputs the pulsed light output from the light source unit and input to an input terminal through an output terminal, and outputs light incident reversely from the output terminal through a detection terminal; a sensing optical fiber connected to the output terminal of the optical circulator and installed to extend over a measurement target region; at least one acoustic focusing member having the sensing optical fiber wound thereon multiple times, arranged in a measurement target region and adapted to focus an external acoustic signal; a light detection unit that detects Rayleigh scattered light scattered in the sensing optical fiber and traveling reversely; and a signal processing unit that control generation of the pulsed light by the light source unit and measures a vibration frequency and an intensity of acoustic received through the sensing optical fiber from a signal detected by the light detection unit, based on an output time point of the pulsed light.

The invention relates to the technical field of optical fiber communication and sensing, in particular to an indoor positioning system based on distributed ultrasonic sensing, which is characterized in that a detection pulse is modulated to light for emission, the detection pulse is amplified by an erbium-doped optical fiber amplifier and then is sent to a to-be-detected optical fiber through an optical circulator; and the received Rayleigh backscattering signal is coupled with the local oscillator after being amplified, and finally demodulation processing is carried out. According to the invention, limitation of sensing distance and sensing frequency can be broken through in a traditional DAS system, effective sampling and recovery of high-frequency signals are realized, a distributed ultrasonic sensing technology is applied to indoor positioning, and a new application direction is developed for the field of real-time detection.

An optical circulator includes a first polarization beam splitter member having a common optical port, a second polarization beam splitter member having an emittance optical port and at least two receiving optical ports, and a first polarization adjustment member. The two receiving optical ports respectively receive two linearly polarized light beams. The two linearly polarized light beams respectively pass through the second polarization beam splitter member, and sequentially pass through the first polarization adjustment member and the first polarization beam splitter member to be combined into a first combined light beam for being output from the common optical port. The common optical port receives a compound optical signal that passes through the first polarization beam splitter member to be split into another two linearly polarized light beams that are combined into a second combined light beam for being output.

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 provides a polarization-dependent reflective two-stage optical ring, which comprises a first collimator, a first beam splitting cube, a first optical rotation component, a second beam splitting cube, a third beam splitting cube of a second optical rotation component and a second collimator arranged along a first optical path, and three beam splitting cubes are respectively light splitting dielectric films; the application combines the characteristics of a transmission two-stage ring and a reflective ring, two optical rotation components are arranged on the first optical path from the first collimator to the second collimator, thereby realizing the series connection of two isolation systems, playing a double-stage isolation effect, meanwhile, the application realizes the optical path folding of a second optical path from the second collimator to the third collimator by using a reflective component, and optical components are multiplexed in one of the optical rotation components, thereby also achieving a double-stage isolation effect; while realizing the double-stage isolation effect, the application also reduces the product volume, is beneficial to the integration of equipment and is also beneficial to cost reduction.