125 results about "Faraday rotator" patented technology

The invention relates to the technical field of laser ranging, in particular to a double-optical-comb hybrid ranging device which comprises a signal detection optical path system and a signal demodulation optical path system. Wherein the signal detection optical path system comprises a first optical frequency comb, a first optical isolator, a first optical collimator, a first beam splitter prism, a reference mirror, a Faraday rotator, a convergence mirror and a target reflector; the signal demodulation optical path system comprises a second optical frequency comb, a second optical isolator, a second optical collimator, a half-wave plate, a second beam splitter prism, a third beam splitter prism, a first polarization controller, a first photoelectric detector, a reflector, a polarization beam splitter prism, a second polarization controller and a second photoelectric detector. A third polarization controller; and a third photoelectric detector. According to the invention, three ranging technologies of asynchronous optical sampling ranging, multi-heterodyne interference ranging and synthetic wavelength ranging are fused, and the problem that a large ranging range and high ranging precision cannot be simultaneously considered in the ranging process is solved.

The utility model is suitable for the technical field of optical fiber sensing, and relates to a double-interferometer push-pull and common-mode noise differential suppression optical fiber hydrophone, which comprises a first thin-wall cylinder, a second thin-wall cylinder, a first optical fiber interferometer and a second optical fiber interferometer, the first thin-wall cylinder is embedded in the second thin-wall cylinder, a first optical fiber winding area and a second optical fiber winding area are arranged on the first thin-wall cylinder, and a third optical fiber winding area and a fourth optical fiber winding area are arranged on the second thin-wall cylinder; the first optical fiber interferometer comprises a first short-arm sensing optical fiber, a first long-arm sensing optical fiber, a first Faraday rotating mirror and a second Faraday rotating mirror, and the second optical fiber interferometer comprises a second short-arm sensing optical fiber, a second long-arm sensing optical fiber, a third Faraday rotating mirror and a fourth Faraday rotating mirror. According to the utility model, the dual-push-pull structure is formed by the dual-fiber interferometer, so that temperature drift noise and optical scattering noise caused by the ultra-long sensing fiber are reduced, and common-mode noise formed by light source vibration, transmission optical cable jitter and the like is suppressed.

The invention relates to the technical field of high-power / high-energy optical passive devices, in particular to a high-length-width-ratio rectangular-aperture Faraday rotator which comprises a circular-hole rectangular light through hole, the middle of the circular-hole rectangular light through hole is rectangular, and the two ends of the circular-hole rectangular light through hole are semicircular. The space waste of a conventional circular light through hole Faraday rotator in the width direction of the rectangular light through surface is overcome, the adaptability of the light through hole of the device to a rectangular light spot application scene is improved, and the size, the weight and the cost of the device are remarkably reduced.

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.

This invention discloses a 9-cavity mode-locked fiber laser with adjustable parameters based on a liquid crystal phase delay device, belonging to the field of mode-locked laser technology. It includes, along the optical path, a mirror, a polarizing beam splitter prism, a liquid crystal phase delay adjustable waveplate, a Faraday rotator, a liquid crystal phase delay adjustable waveplate, and a polarizing beam splitter prism. A fiber optic loop is provided on one side of the polarizing beam splitter prism, comprising, in sequence, a fiber collimator, a gain fiber, a wavelength division multiplexing-splitter mixer, and a fiber collimator prism. The slow axis of the fiber collimator prism's pigtail is aligned horizontally with the polarizing beam splitter prism prism 2; the slow axis of the fiber collimator prism 2's pigtail is aligned vertically with the polarizing beam splitter prism prism 2. A pump semiconductor laser is connected to the pump input of the wavelength division multiplexing-splitter mixer, and an FCAPC jumper is connected to the signal output of the wavelength division multiplexing-splitter mixer. This enables continuous and rapid adjustment of the laser parameters.

This invention provides an optical isolator (81) with two or more optical paths, characterized in that each optical path comprises an isolator chip (3) formed by interconnecting one or more polarizers (4) and one or more Faraday rotators (5). The isolator chip (3) and a substrate are bonded and fixed together. The substrate is a light-transmitting substrate (2), and light passing through the optical path is transmitted through the isolator chip (3) and the light-transmitting substrate (2). Thus, for optical isolators inserted into laser modules with multiple optical paths, an optical isolator is provided that does not require the isolator chip to be placed in space outside the light-transmitting part, and simplifies the assembly process of the isolator chip.

Provided is a magnetic circuit which, with the use in an optical isolator, is less likely to cause the polarizer to be damaged even with higher laser output power. A magnetic circuit 1 includes first to third magnets 11 to 13 each provided with a through hole allowing light to pass through and is composed of the first to third magnets 11 to 13 arranged coaxially in this order in a front-to-rear direction, wherein one of the first and third magnets 11 and 13 is magnetized in a direction Y perpendicular to a direction X of an optical axis to have a north pole located toward the through hole 2, the other of the first and third magnets 11 and 13 is magnetized in a direction Y perpendicular to the direction X of the optical axis to have a south pole located toward the through hole 2, the second magnet 12 is magnetized in a direction parallel to the direction X of the optical axis to have a north pole located toward the one of the first and third magnets 11 and 13 having the north pole located toward the through hole 2, and a length L1 of the first magnet 11 along the direction X of the optical axis is different from a length L3 of the third magnet 13 along the direction X of the optical axis.

A laser system is provided with: a laser oscillator system that outputs a first pulse laser beam in a first polarization direction and a second pulse laser beam in a second polarization direction that is rotated by 45 degrees in a first rotation direction with respect to the first polarization direction; the beam combiner is used for combining the first pulse laser and the second pulse laser; the beam combiner is provided with: a first polarizing plate; a first Faraday rotator that rotates the polarization direction of the first pulse laser beam that has passed through the first polarizing plate by 45 degrees in the direction opposite to the first rotation direction; and a second polarizing plate that transmits the first pulse laser beam that has passed through the first Faraday rotator and reflects the second pulse laser beam. And the multi-pass Faraday mirror is used for reflecting the first pulse laser and the second pulse laser towards the second polarizer. The multi-pass Faraday mirror comprises a first Faraday material, an electromagnet and a plurality of reflectors, the processor controls current flowing through the electromagnet through the power supply, so that the current does not flow through the electromagnet when the first pulse laser penetrates through the multi-pass Faraday mirror, and current rotating 90 degrees in the polarization direction of the second pulse laser flows through the electromagnet when the second pulse laser penetrates through the first Faraday material.

The present invention provides defect-controlled fluoride crystals, a method for producing the same, and the use thereof. These fluoride crystals contain at least a rare earth element RE (RE is at least one element selected from the group consisting of cerium (Ce), praseodymium (Pr), lanthanum (La), and neodymium (Nd)), fluorine (F), and hydrogen (H), and have the same crystal structure as crystals represented by CeF3. A method for producing fluoride crystals according to the present invention comprises growing crystals from a raw material containing a rare earth element RE and a raw material containing fluorine (F) by a solvothermal method in the presence of at least one mineralizer selected from the group consisting of mineralizers containing an alkali metal element and / or an alkaline earth metal element, acid mineralizers, and mineralizers containing a normal salt.

The present application discloses a lossless switching magneto-optical switch, belonging to the field of optics. A first polarization beam splitter decomposes parallel light input from an input end into two sub-beams, p-light and s-light, with orthogonal polarization directions. The p-light and s-light form two main optical paths. A first half-wave plate can rotate the polarization direction of the p-light by 135° clockwise along the optical path transmission direction and the polarization direction of the s-light by 45° counterclockwise along the optical path transmission direction. A Faraday rotator crystal applies magnetic fields in different directions to rotate the main optical path by 45° clockwise or 45° counterclockwise, simultaneously generating two weak optical paths. A second polarization beam splitter converges the p-light and s-light of the two main optical paths to a first output end or a second output end, and converges the p-light and s-light of the two weak optical paths to another second output end or the first output end. When the optical channel is switched, both the strong light and the weak light are coupled into different channels. The sum of the energies at the first and second output ends and the sum of the energies at the first and second output ends after the switch are completed are always in a stable state, bringing stability to network transmission.

Embodiments herein relate to systems, apparatuses, or processes directed to an integrated optical coupler that may be used to optically couple a waveguide and a PIC. In embodiments, the integrated optical coupler may include an optical diffraction grating mechanism, an optical lens, and a Faraday rotator. In embodiments, the integrated optical coupler may at least partially within a housing. Other embodiments may be described and / or claimed.

The invention relates to the field of optical communication, and provides a polarization-independent semiconductor optical amplifier device. The device comprises a polarization beam splitter, a polarization-related SOA chip, two 45-degree Faraday optical rotation sheets, two 45-degree polarization optical rotation sheets and a light guide structure. Random polarized light enters the polarization beam splitter to be split into two beams of light with the polarization state perpendicular to each other, and the two beams of light are connected together through the light guide structure to form a loop. The left side and the right side of the SOA chip are respectively provided with a Faraday optical rotation sheet and a polarization optical rotation sheet. The two beams of light are reversely transmitted in the optical loop and have the same polarization direction when entering the SOA chip, and the orientation of the SOA chip is adjusted into a TE mode polarization direction which is parallel to the TE mode polarization direction; the polarization state of the two light beams is not changed after the two light beams pass through the loop, and the two light beams are combined into one output light beam on the polarization beam splitter. According to the invention, L-band randomly polarized signal light can be amplified by using the existing mature material system, and the polarization-dependent gain is extremely small.

The invention discloses a DAS-based liquid medicine oil-water layering identification system and a working method thereof, and belongs to the field of optics-pharmacy crossing. The method is used for accurately identifying the oil-water layering condition in the liquid medicine, and is convenient for scientifically and effectively evaluating the excellence of the liquid medicine. The system comprises a laser source, a first optical fiber coupler, a phase modulator, a first optical fiber circulator, an acousto-optic modulator, a Faraday polarization mirror, an erbium-doped optical fiber amplifier, a second optical fiber circulator, an optical fiber Bragg grating, a third optical fiber circulator, a sensing optical fiber, a liquid container, a piezoelectric transducer, a polarization beam splitter, a polarization controller and a second optical fiber coupler. The system comprises a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler, a fourth optical fiber coupler, a first photoelectric balance detector, a second photoelectric balance detector, a data acquisition card, a computer and a radio frequency signal source. According to the invention, the high-resolution DAS is used for measuring the oil-water layering condition of the liquid medicine; meanwhile, the system has the advantages of high response, high sensitivity, high fidelity, high resolution, small size, corrosion resistance and the like.

The present invention discloses a simplified bidirectional quantum time synchronization reference clock station device, system, and method. The system includes a reference clock station device and a station device to be synchronized. The reference clock station device includes: a frequency-entangled two-photon source, a first beam splitter, a first circulator, a first polarization beam splitter, a polarization beam combiner, a first single-photon detector, a first event timer, and a reference clock; the station device to be synchronized includes a second circulator, a third circulator, a fiber Faraday rotator, a second polarization beam splitter, a second single-photon detector, a second event timer, a clock to be synchronized, and a data processing terminal. The present invention uses the same entangled two-photon source as the quantum light source to avoid the impact of low frequency consistency of two frequency-entangled two-photon sources on synchronization accuracy in existing solutions. Reducing the number of single-photon detectors also reduces the impact of inherent detector jitter on synchronization error, thereby further improving the accuracy of quantum time synchronization.

The application discloses a machine learning assisted fiber-optic gyroscope polarization locking and slow drift compensation system. The system can intelligently search and predict the relationship between the fiber-optic gyroscope interference error signal and the incident light polarization direction by introducing the neural network in machine learning, and feed back the predicted optimal value to the hardware system for compensation, thereby realizing the functions of fiber polarization locking and suppressing the intensity slow drift of the output signal. The system comprises a coherent light source, a Glan laser prism, a first polarization beam splitter, a first mirror, a first Faraday rotator, a first half-wave plate, a liquid crystal modulator, a polarization maintaining optical fiber, a phase modulator, a second Faraday rotator, a second half-wave plate, a second mirror, a third half-wave plate, a second polarization beam splitter, a photodetector, a computer and a signal generator. The application also discloses a machine learning assisted fiber-optic gyroscope polarization locking and slow drift compensation method realized by using the above system.

The present invention provides a bismuth-substituted rare earth iron garnet single crystal which suppresses valence variation of Fe ions and is suitable for a Faraday rotor and an optical isolator having reduced insertion loss. The bismuth-substituted rare earth iron garnet single crystal according to the present invention is characterized by a composition formula of (Tb a Ln b Bi c Mg 3‑(a+b+c) )(Fe d Ga e Ti f Pt 5‑(d+e+f) )O 12 In the composition formula, 0.02 ≤ f ≤ 0.05, 0.02 ≤ {3-(a+b+c)} ≤ 0.08, and -0.01 ≤ {3-(a+b+c)}-{f+5-(d+e+f)} ≤ 0.01. Furthermore, Ln is a rare earth element and can be selected from Eu, Gd, Ho, Tm, Yb, Lu, and Y.

The present invention discloses a three-port reflective optical circulator based on a birefringent crystal, belonging to the field of optical communications. The three-port reflective optical circulator comprises a first birefringent crystal, a half-wave plate assembly, a roof prism, a Faraday rotator crystal, a second birefringent crystal, a quarter-wave plate, and a reflector, which are arranged in sequence. The first port, the second port, and the third port are respectively located on a side of the first birefringent crystal away from the half-wave plate assembly. The birefringent crystal performs light splitting to split a light beam into two sub-beams, o-polarized light and e-polarized light, with mutually perpendicular polarization directions. The polarization directions of the sub-beams are controlled by the half-wave plate, the quarter-wave plate, and the Faraday rotator crystal. Finally, the birefringent crystal performs light combining, thus realizing the functions of the optical circulator with input at the first port and output at the second port, and with input at the second port and output at the third port. The three ports are located on the same side of the optical circulator, making it easier to arrange other components and miniaturizing the optical circulator.

The utility model discloses a Faraday rotator convenient to install, and relates to the technical field of optical elements. The device comprises a rotary table, wherein an installation mechanism and a configuration mechanism are arranged on the rotary table. By arranging the mounting mechanism, in the operation process, the pawl can move upwards so as to release the limitation of the pawl on the ratchet block, then the insertion rod on the pawl is inserted into the round hole in the rotary table, the pawl is temporarily fixed, the ratchet block is conveniently pulled towards the two sides through the operation, and the ratchet block can be conveniently fixed. A space is provided for smooth insertion of a sliding plate at the bottom of the Faraday rotator, meanwhile, when a ratchet block is pulled, a sliding block on the ratchet block can exert pressure on a first spring on the outer wall of a sliding rod, energy is stored, preparation is made for follow-up reset operation, then the sliding plate at the bottom of the Faraday rotator can be inserted into a sliding groove in a rotary table, and after insertion is completed, the sliding plate at the bottom of the Faraday rotator is inserted into the sliding groove in the rotary table. When the two ratchet blocks are loosened, the sliding blocks can drive the ratchet blocks to get close to each other under the combined action of the first springs and the sliding rods.

The invention relates to a method for growing a terbium lithium fluoride magneto-optical crystal by using a fluxing agent. The process comprises the following steps: (1) fully mixing a fluxing agent with raw materials; (2) putting the mixture into a crucible, feeding the crucible into a high-temperature molten salt furnace, vacuumizing the furnace, and introducing protective gas; and (3) controlling the heating rate, heating until the mixture is completely molten, and keeping the temperature for several hours. And (4) slowly cooling until crystals are completely separated out. And (5) annealing to room temperature to obtain the terbium lithium fluoride crystal. Tests show that the terbium lithium fluoride crystal prepared by the method is good in quality, large in extinction ratio and high in damage threshold, has relatively high transmittance and relatively strong magneto-optical performance in wave bands of 505nm, 633nm, 880nm and 1064nm, and is expected to be practically applied to magneto-optical devices such as magneto-optical isolators, Faraday rotators and the like.

The utility model discloses an output isolator and a laser, the output isolator comprises a frequency multiplication isolation assembly, the frequency multiplication isolation assembly comprises a frequency multiplier and a Faraday rotator, and the frequency multiplier is used for carrying out frequency multiplication processing on laser; the Faraday rotator is used for adjusting the polarization direction of the laser, and the frequency multiplier and the Faraday rotator are connected in series to a light path between the input end and the output end of the frequency multiplication isolation assembly, so that the laser input from the input end of the frequency multiplication isolation assembly is output from the output end of the frequency multiplication isolation assembly after passing through the frequency multiplier and the Faraday rotator. When the output isolator is used for the laser, the laser emitting assembly of the laser only needs to emit the laser of one wavelength, then the laser is divided into the laser of two wavelengths through the output isolator, and while the laser emits the dual-wavelength laser, a complex light path structure does not need to be arranged in the laser to combine the laser of two wavelengths into one laser. And the cost of the laser is reduced.

The present invention concerns a system for generating quantum keys between two nodes of an optical communication network. The system comprises a transmitting node and a receiving node, operationally connected to each other by at least one birefringent optical communication channel. The transmitting node comprises a photon source, an optical port adapted to transmit and receive photons on the optical communication channel, a detector assembly adapted to detect and count photons received from the receiving node. The receiving node comprises an optical port for receiving and transmitting photons on the optical communication channel, and a photon emitter adapted to emit at least one photon in response to the at least one photon transmitted by the transmitting node. The photon emitter comprises at least one birefringent element. Advantageously, the receiving node comprises control means of the photon emitter. The control means are adapted to adjust a birefringence of the at least one birefringent element as a function of polarization information associated with the at least one photon transmitted by the transmitting node. In particular, the polarization information is extracted from the at least one photon transmitted by the transmitting node or is provided by the transmitting node. Advantageously, the photon emitter comprises an emulator device of a Faraday rotator mirror or comprises a retroreflector consisting of three mirrors orthogonal to each other and rotated by 45° around respective orthogonal axes. The Faraday rotator mirror and the retroreflector are orientable in space to reflect the at least one photon transmitted by the transmitting node uniquely and determined when oriented appropriately.

The present application relates to a parasitic noise suppression laser frequency shift feedback device, comprising: a laser, a collimating lens, a beamsplitter, a Faraday rotator, a half-wave plate, an acousto-optic frequency shifting unit, a focusing lens unit, and a quarter-wave plate, arranged sequentially along a first direction, the first direction being the direction of the laser's output light; backscattered light from a target to be measured can be sequentially returned to the laser cavity via the quarter-wave plate, focusing lens unit, acousto-optic frequency shifting unit, half-wave plate, Faraday rotator, beamsplitter, and collimating lens, where it is modulated by the laser frequency shift feedback effect and then output by the laser. The aforementioned parasitic noise suppression laser frequency shift feedback device achieves parasitic noise suppression and normal amplification of signal light by adding a Faraday rotator, a half-wave plate, and a quarter-wave plate to the optical path, with minimal impact on the device's complexity and no restrictions on the device's use when the target to be measured is at close or long distances.

An optical isolator includes a polarizer for receiving an optical signal from an optical signal source, a Faraday rotator for rotating a polarization of the optical signal output by the polarizer and outputting the same as a rotator output optical signal, and an analyzer for receiving the rotator output optical signal and for outputting at least a part thereof. The polarizer and the analyzer each include a number of spaced elongated dielectric ridges coupled to the Faraday rotator. Each dielectric ridge has a length direction extending along one surface of the Faraday rotator and pair of spaced sides extending away from the one surface of the Faraday rotator. Each dielectric ridge includes an electrically conductive coating on each side of the dielectric ridge.

The application discloses a kind of based on non-interacting polarization multiplexing multi-path pulse compression device and method, it is related to ultrafast laser technology and nonlinear optics field, device includes: first polarization beam splitter, Faraday rotator, second polarization beam splitter and dispersion compensation module, dispersion compensation module is used to make pulse multiple pass through same dispersion compensation element and form return pulse, return pulse is converted into polarization state orthogonal with incident state by Faraday rotator after by first polarization beam splitter output. By Faraday non-interacting coaxial architecture, pulse keeps high-efficiency polarization matching, reduces astigmatism, spatial chirp and energy loss caused by off-axis folding, and when target dispersion amount is certain, optical envelope volume is reduced, and element light aperture requirement is reduced;While pulse compression and reverse light isolation are integrated in the same magneto-optical component, reduce the number of discrete components, improve system compactness and stability.

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.

Described herein are systems and methods for enabling small high-magnification cameras or imaging systems to operate in low-light (e.g. night time) conditions. These systems include the use of reflective polarizers and non-reciprocal elements (Faraday rotators) to enable a longer light path, and to enable light from an image to reach the sensor.

Method for laser material processing using a processing laser beam (3), wherein a first laser beam (8a), which is coupled into at least a first fiber core (9a) of an optical multicore fiber (9), and a second laser beam (8b), which is coupled into at least a second fiber core (9b) of the multicore fiber (9), are generated from a polarized input laser beam (5) using a birefringent crystal (7), wherein by influencing the polarization of the input laser beam (5) the ratio in which the power of the input laser beam (5) is divided between the first and the second laser beam (8a, 8b) is changed with a modulation frequency (f) between 1 Hz and 100 kHz, in particular between 100 Hz and 100 kHz, and thereby the first and the second laser beam (8a, 8b) can be coupled out of the multi-core fiber (9) alone or together as a processing laser beam (3). characterized by that the polarization is influenced by switching between linearly, circularly or elliptically polarized polarization by means of an electro-optic polarization modulator (6), in particular a Pockels cell or Faraday rotator, which can be controlled with the modulation frequency (f) to change the polarization of the input laser beam (5).

The invention discloses a cavity enhanced narrow linewidth orbital angular momentum entanglement source, and relates to the field of quantum information and laser, the entanglement source locks a flat-concave cavity in a mode of OAM = + / -1 through a PDH cavity locking technology, and a spiral phase plate obtains cavity locking light with set orbital angular momentum; the electro-optical modulator modulates the cavity locking light, and a reflection signal is obtained through the polarization beam splitter and the Faraday rotator; the electronic device modulates and demodulates a reflected signal detected by the photoelectric detector to obtain a negative feedback signal; the PID control module controls the voltage of the piezoelectric ceramic based on the negative feedback signal so as to control the cavity length; the modulated pump light enters a crystal in the lower conversion cavity, the temperature of the crystal is adjusted through a temperature controller, and a multimode photon pair is generated; output signals are filtered by a dichroic mirror, pump light is filtered by an isolator and an etalon, and a single-mode entanglement source is obtained. According to the invention, high-dimensional expansion can be realized, post selection does not need to be generated in the cavity, and the problem that an entanglement source generates parasitic noise can be solved.

This utility model relates to a low-cost integrated module for a polarization-independent optical circulator and filter, comprising a first collimator, a circulator core, and a second collimator arranged sequentially. The first collimator is a four-fiber collimator, and the second collimator is a single-fiber collimator. The circulator core consists of a first polarizing beam splitter, a half-wave plate, a Faraday rotator crystal, a second polarizing beam splitter, a first filter, a first reflector, a second filter, a second reflector, and a magnetic block. The angle between the first filter and the first reflector is α; the angle between the second filter and the second reflector is also α. This design effectively realizes the circulator and wavelength division multiplexing functions during optical signal transmission. This design not only avoids unnecessary signal reflection and loss but also enhances the isolation of the optical circulator, achieving double-stage isolation. Wavelength division multiplexing can be achieved through small-angle incident light, making the optical path layout of the device more compact.

The invention discloses a bipolar isolator, and relates to the technical field of optical isolation, the bipolar isolator comprises a shaft shell and a sleeve shell, Faraday polarizers are arranged in the shaft shell and the sleeve shell, the end part of the shaft shell is provided with an insertion part, the end part of the sleeve shell is provided with an insertion cylinder matched with the insertion part, and the insertion part is in insertion fit with the insertion cylinder. Polarization beam splitters are arranged at one end, far away from the sleeve shell, of the shaft shell, one end, far away from the shaft shell, of the sleeve shell and in the insertion part; the polarization beam splitters are located on the axis of the Faraday rotator; the two spaces capable of containing the Faraday polarizers are provided through the two shaft shells and the two sleeve shells which are mutually matched and connected in an inserted mode, the two isolator bodies are formed in cooperation with the polarization beam splitters on the two sides and in the middle at the same time, bipolar isolation of light is achieved, the isolation degree is effectively improved, and meanwhile the matching structure of the shaft shells and the sleeve shells is simple, convenient to install and low in cost. The cost is saved.