90 results about "Optical attenuator" patented technology

The invention provides a C + L wave band optical fiber amplification module and an optical fiber laser. The C + L wave band optical fiber amplification module comprises a first bidirectional pumping unit, a gain flattening filter, a variable optical attenuator and a second bidirectional pumping unit, a first gain optical fiber of the first bidirectional pumping unit adopts a three-section splicing structure formed by sequentially welding a first bismuth-doped optical fiber, an erbium-doped optical fiber and a second bismuth-doped optical fiber along a signal transmission direction, and a second gain optical fiber of the second bidirectional pumping unit is a bismuth-erbium co-doped optical fiber; wherein the first bidirectional pumping unit is used for performing primary amplification on C + L wave band seed light to generate first signal light; and the second bidirectional pumping unit is used for performing secondary amplification on the adjusted first signal light to generate second signal light. According to the invention, low-noise, high-gain and high-flatness C + L wave band amplification signals can be output.

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 utility model relates to the technical field of laser application, in particular to a laser frequency stabilization device based on an etalon frequency measurement technology, which comprises a laser emission unit, a frequency detection unit, a frequency stabilization laser output end and a master control adjusting unit, the frequency detection unit comprises an optical splitter, an optical attenuator, a first photoelectric detector, an etalon and a second photoelectric detector. An etalon in the frequency detection unit is used as a frequency reference, an optical attenuator is arranged to reduce temperature rise and improve precision, a first photoelectric detector and a second photoelectric detector are used to provide a frequency measurement error signal and a reference signal, and the master control adjustment unit is used to carry out analysis and calculation according to the error measurement signal and the reference signal. And the laser emitting unit adjusts the laser frequency according to the adjusting signal, so that the frequency stabilization adjustment of the laser is realized.

A coherent transmitter (100, 200) for use in a time division multiple access (TDMA) system is operated in multiple states to enable coherent burst transmission. In an OFF state, the transmitter (100, 200) generates a dummy laser output (fd) from either a dummy laser (102) or an active laser (52) tuned to a dummy frequency different from an active frequency (fa), thereby maintaining thermal and bias stability without adding excess power on an upstream channel (22). In an ON state, the active laser (52) produces an active laser output (fa) that is modulated by a quad-parallel Mach-Zehnder (QPMZ) modulator (60) to transmit data. A thermoelectric cooler (TEC) (58) stabilizes laser temperatures, and a variable optical attenuator (VOA) (54) controls output power. The transmitter (100, 200) is suitable for an optical network unit (ONU) (14) in a passive optical network (PON) (10) communicating with an optical line terminal (OLT) (12).

A fiber laser device (1) is provided with: a first excitation light source (12) capable of emitting first excitation light; a first amplification optical fiber (11) to which an active element that absorbs the first excitation light is added, and which amplifies and emits the light of the first wavelength; a second amplification optical fiber (21) to which an active element that absorbs the light of the first wavelength and is the same as the active element added to the first amplification optical fiber (11) is added, and which amplifies and emits the light of the second wavelength; beam combiners (31), (32); and a light attenuation unit (60) that is provided on an optical path between the beam combiners (31, 32) and the first amplification optical fiber (11), transmits light from the first amplification optical fiber (11), and suppresses the transmission of light from the beam combiners (31, 32).

The invention discloses an ultra-wideband weak signal detection method and system based on all-optical oscillation and phase-amplitude conversion. The method comprises the steps that spontaneous radiation light generated by an erbium-doped optical fiber amplifier is used as an optical carrier; modulating a weak radio frequency signal to be measured received by an antenna to the optical carrier through an optical modulator to form a modulated optical signal; the modulated optical signal is injected into an all-optical oscillation circuit composed of double loops, the all-optical oscillation circuit generates multimode optical oscillation by adjusting an optical attenuator, and the all-optical oscillation circuit comprises a double-loop interference structure; performing phase-amplitude conversion by adjusting the delay difference of the two light paths in the double loops to form an equivalent microwave photon filter so as to select and amplify the modulated light signal corresponding to the radio frequency signal of the set frequency band; and converting the selected and amplified modulated optical signal into an electric signal, and performing spectral analysis to detect the weak radio frequency signal to be detected.

The invention discloses a photoelectric chip with power attenuation regulation and control and real-time monitoring functions. The photoelectric chip comprises a coupling waveguide, a connecting waveguide, a light beam splitting structure and a variable optical attenuator, an optical signal enters the chip through the input coupling waveguide and is transmitted to the optical beam splitting structure through the first connecting waveguide, the optical beam splitting structure divides the optical signal into a monitoring signal and a main transmission signal, and the monitoring signal is transmitted to the first variable optical attenuator through the optical beam splitting structure and the second connecting waveguide in sequence and then is connected to the photoelectric detection system through the monitoring output coupling waveguide. The main transmission signal is transmitted to the second variable optical attenuator through the optical beam splitting structure and the third connection waveguide in sequence, and then is transmitted back to the original optical fiber link through the main signal back-transmission coupling waveguide. The chip disclosed by the invention can be prepared on a large scale by adopting a standard micro-nano process, is low in coupling loss and high in compatibility, can be customized on a single chip or in an array manner, is accurate in monitoring and convenient to install, and can be widely applied to real-time monitoring and attenuation regulation and control of links in the fields of optical fiber communication, optical sensing and the like.

This invention discloses an integrated quantum key distribution device and method, which serves as both a transmitter and a receiver. As a transmitter, an optical injection locking device generates a group of optical pulses, which, after passing through an optical attenuator, are input to an unequal-arm Mach-Zehnder interferometer to obtain the quantum states of the corresponding basis vectors, and then input to a quantum channel. As a receiver, quantum states are received from the quantum channel. For Z-based quantum states, the output is sent to a third single-photon detector for decoding after passing through an optical beamsplitter; for X-based or Y-based quantum states, the output is sent to the unequal-arm Mach-Zehnder interferometer after passing through an optical beamsplitter, and then to a first and second single-photon detector for decoding. This invention eliminates the need for external modulation, enabling quantum state preparation and measurement within a single device using only one interferometer. This reduces the complexity of the quantum key distribution system, improves its compactness, and facilitates practical application.

The invention discloses a control method for acquiring a narrow linewidth laser signal. The method comprises the following steps: transmitting output light of a laser to a runway type micro-ring resonator introduced with a fine adjustment structure through a spot size converter and a normally closed variable optical attenuator in sequence; feedback light generated by the runway type micro-ring resonator with the introduced fine adjustment structure is fed back to the laser through the normally-closed variable optical attenuator and the spot size converter in sequence; a random parallel gradient descent algorithm is adopted, the sampling voltage of the trans-impedance amplifier serves as a performance index, cooperative control is conducted on the first working voltage of the first phase shifter and the second working voltage of the second phase shifter integrated on the normally-closed variable optical attenuator, and a narrow linewidth laser signal is obtained. According to the invention, the problems of low efficiency and slow response speed during acquisition of narrow linewidth laser signals in the prior art are solved.

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.

Silicon Photonics is a candidate technology for adding integrated optics functionality, either passive or active optical waveguides) to integrated circuits by leveraging the economies of scale of the CMOS microelectronics industry and using materials for the waveguide core such as silicon nitride (SiXNY) and silicon oxynitride (SiOXN1-X) for example. Microelectromechanical systems (MEMS) provide for movable platforms relative to the substrate allowing additional functionality to be added to a silicon circuit but also Silicon Photonics. Accordingly, by combining “fixed” waveguides formed upon the substrate with “movable” waveguides formed upon one or more movable platforms the inventors have established a series of Integrated Optics MEMS (IO-MEMS) based on Silicon Photonics. Such IO-MEMS include optical switches, optical attenuators, optical gates, optical switch matrices, configurable wavelength division multiplexer / demultiplexer devices, etc. exploiting both platforms and deformable beams.

The utility model provides an optical attenuator capable of reducing on-chip light return loss, which comprises a chip substrate 1, a laser chip 2 and a double-arm waveguide structure 3, the double-arm waveguide structure 3 is arranged on the chip substrate 1, one end of the double-arm waveguide structure 3 is coupled with the laser chip 2, and the other end of the double-arm waveguide structure 3 is coupled with the laser chip 2. The other end of the double-arm waveguide structure 3 extends to the output end face 11 of the chip substrate 1. A preset angle is formed between the output end face 11 of the chip substrate 1 and the extension direction of the double-arm waveguide structure 3, and the preset angle is larger than 90 degrees. The output end face 11 of the chip substrate 1 is prevented from forming a 90-degree angle with the extension direction of the double-arm waveguide structure 3, so that the return light reflected back along the original light path after the output signal is reflected by the output end face 11 is reduced, the loss caused by the return light is further reduced, and the transmission quality of the light signal is improved.

This invention provides a switchable multi-channel monitoring beam splitter device, comprising an optical switch having multiple input ports and one output port, the output port of which is connected to a photodetector. The device also includes multiple pairs of 2×2 optical couplers, each pair having two 2×2 optical couplers. The first output of each optical coupler outputs a light beam to an optical attenuator, which then outputs the attenuated light beam back to the optical switch. This invention allows for the detection of optical power across multiple beams using only a single photodetector, reducing the production cost of multi-channel monitoring systems.

The application provides an atomic magnetometer light power adjustment system and method based on line width scanning, and belongs to the field of precision measurement. The atomic magnetometer light power adjustment system comprises: a magnetic field generating coil configured to generate a scanning magnetic field linearly changing over time based on a preset waveform driving current; an atomic gas chamber configured to modulate detection light of an atomic magnetometer based on the scanning magnetic field to obtain a light modulation signal; a photodetector configured to convert the light modulation signal into an initial electric signal; a signal processing module configured to obtain an atomic spectral line width value based on the initial electric signal; and an adjustment module configured to adjust a light attenuator of the atomic magnetometer based on a preset light power-atomic spectral line width calibration relationship, a target light power value and the atomic spectral line width value, so as to update the light power value of the atomic magnetometer.

The application discloses a laser phase noise measurement method based on delay self-heterodyne and digital demodulation, and relates to the technical field of laser measurement, and comprises the following contents: after being adjusted by a variable optical attenuator, to-be-measured laser is divided into a frequency shift arm and a delay arm, the frequency shift arm is frequency-shifted by an acousto-optic modulator, the delay arm is delayed by a delay optical fiber, and original electric beat frequency signals are obtained by a balanced photoelectric detector after the two arms are coupled; homologous and synchronous quadrature demodulation is carried out on the original electric beat frequency signals, envelope credibility judgment and abnormal sample repair are combined, and a continuous differential phase sequence is obtained; actual optical time delay is determined according to the beat frequency spectrum characteristics and the continuous differential phase sequence, and a differential phase power spectral density is formed; then, transmission relationship conversion is carried out according to the actual optical time delay, bounded spectrum compensation is implemented on a zero point neighborhood and a low credibility frequency point, and an intrinsic phase noise power spectral density is obtained. The application can improve the stability, continuity and result credibility of phase noise measurement under the condition of short delay.

The application discloses an integrated tunable optical attenuator based on mode-circulating phase shift and reflection, comprising a single-mode optical waveguide, a 2*2 optical coupler, a high-order mode-circulating phase shifter and a waveguide optical reflector; wherein the 2*2 optical coupler is used for splitting the optical energy of the input port into two paths and outputting the optical energy into the high-order mode-circulating phase shifter, the high-order mode-circulating phase shifter uses the high-order mode selectivity of a mode coupler and the staggered arrangement of the mode order of a mode exchanger to make the optical field circulate in the high-order mode-circulating phase shifter for multiple times, thereby achieving the fold increase of the phase modulation efficiency; the waveguide optical reflector reversely couples the optical field modulated by the high-order mode-circulating phase shifter back to the high-order mode-circulating phase shifter, so that the optical field energy and information circulate in the high-order mode-circulating phase shifter for multiple times through the multimode optical phase shift arm, thereby further doubling the optical modulation efficiency.

This invention provides an energy adaptive adjustment device and method for underwater wireless optical communication, relating to the field of underwater wireless optical communication. The device includes: an adaptive adjustment module, a signal processing module, an optical antenna, a tunable optical attenuator, and a beam splitter. The tunable optical attenuator adjusts the light intensity energy of the optical signal according to the feedback signal from the adaptive adjustment module. The beam splitter splits the optical signal output from the tunable optical attenuator into two paths, one transmitted to the adaptive adjustment module and the other to the signal processing module. The signal processing module generates an energy calibration result and sends it to the adaptive adjustment module, and receives the optical signal from the beam splitter, processes it, and outputs it. The adaptive adjustment module receives the signals from the beam splitter and the signal processing module, processes them, and feeds them back to the tunable optical attenuator. This invention solves the problem that the signal energy detected by the receiving end of the device cannot be adaptively adjusted, improving the practicality and robustness of the communication device.

The application provides a self-calibration high-intensity optical fiber hydrophone based on an end face reflection principle and relates to the technical field of hydrophones.The application comprises the following steps: a laser light source emits a first laser beam, a fiber optical isolator inhibits reflection and outputs a second laser beam, a fiber adjustable optical attenuator adjusts incident power and outputs a third laser beam, a 1x2 fiber coupler divides the third laser beam into a fourth laser beam and a fifth laser beam, a first photoelectric detector monitors power, a fiber circulator transmits the fifth laser beam to a fiber sensing module, generates reflected light and transmits the reflected light to a second photoelectric detector, and the second photoelectric detector converts the reflected light into a voltage signal, a data acquisition card acquires the signal, a signal demodulation processing unit calculates sound pressure sensitivity according to a mapping relationship formula of the voltage signal and the sound pressure, and a standard voltage module provides a standard voltage for the data acquisition card.The application solves the problems that a high-intensity hydrophone cannot be reused and cannot be self-calibrated after being damaged in the prior art.

A variable optical attenuator (VOA) array is described, which may achieve a power adjustment speed of 1 ms or less for each channel. The VOA array includes: a substrate; and a plurality of VOAs disposed on the substrate, where the plurality of VOAs have trenches therebetween, and a VOA in the plurality of VOAs includes: a phase change material (PCM) layer, where a state of the PCM layer is selectively in a crystalline state, an amorphous state, or a mixed state based on temperature of the PCM layer, and variation of the state of the PCM layer is used for adjusting an output power of an optical signal input into the VOA array; a controller configured to change the temperature of the PCM layer; and a mirror layer configured to reflect the adjusted optical signal of the

The invention relates to an electric control optical attenuator based on collaborative regulation and control of non-volatile phase change and carrier absorption. The electric control optical attenuator comprises a main waveguide structure; the multiple sections of attenuation units are sequentially arranged on the main waveguide structure in the propagation direction of optical signals in the main waveguide structure, the multiple sections of phase change attenuation units are used for achieving discrete coarse tuning control over the optical signals, and the fine tuning unit achieves continuous fine tuning compensation through the carrier absorption effect. And the two components cooperate to form a graded programmable optical power regulation and control system. According to the invention, precise optical power control combining non-volatile and continuous adjustable functions can be realized, and the requirements of an integrated photon system for high-dynamic range and high-precision attenuation devices are met.

The invention belongs to the technical field of quantum information, and relates to a non-detection photon imaging system based on a single optical fiber integrated nonlinear waveguide. Comprising a continuous tunable pumping laser source, an optical amplifier, an adjustable optical attenuator, a first beam splitter, a first adjustable optical delay line, a first polarization controller, a second polarization controller, a first optical circulator, a nonlinear straight waveguide, a second optical circulator, a first optical filter, a second optical filter, a third optical filter, a fourth optical filter, a third optical circulator, a second adjustable optical delay line and an optical absorption terminal. The system comprises a first light collimator, a first lens, a three-dimensional scanning platform, a second lens, a second light collimator, a second beam splitter, a third polarization controller, a fourth polarization controller, a first single-photon detector, a second single-photon detector and a coincidence measurement unit. Compared with a traditional non-detection photon imaging system, quantum imaging of a transparent object can be achieved only through half of resource expenditure, and robustness is provided for the imaging system through all-fiber integrated configuration.

The invention belongs to the technical field of atmospheric trace gas detection, and particularly relates to a laser heterodyne radiometer for locking local oscillator optical power based on an adjustable optical attenuator. Comprising a variable optical attenuator and an optical fiber beam splitter, and the optical fiber beam splitter transmits local oscillation light attenuated by the variable optical attenuator to a first photoelectric detector and a frequency calibration module and carries out beam combination and frequency beating on the local oscillation light and signal light; the output end of the first photoelectric detector serves as the input end of the PID controller, a control signal is calculated and sent to the variable optical attenuator, and the frequency calibration module and the signal processing module are jointly and sequentially connected with the acquisition card and the upper computer to output a measurement result. By combining the variable optical attenuator with digital PID feedback control, dynamic and closed-loop locking of local oscillator optical power is realized, an atmospheric absorption spectrum without a slope baseline can be obtained, and the accuracy of measuring the atmospheric gas concentration by the laser heterodyne radiometer is effectively improved.

The application provides an online near-infrared spectrum detection method and system for biomass raw material components, and relates to the technical field of component detection. Firstly, the particle size distribution and the near-infrared spectrum data of the biomass raw material are acquired in real time, and the two types of data are time-stamped and aligned to establish a correlation mapping. Secondly, based on the mapping data, the channel spacing of a multi-channel adjustable distance optical attenuator is dynamically adjusted to generate standardized spectrum data that eliminates particle size interference. Then, by assigning differentiated weights to the characteristic wavebands of each main component, enhanced characteristic spectrum data is constructed. Finally, a multi-output regression model is established using pre-set samples, and the contents of cellulose, hemicellulose, lignin and other components are simultaneously inverted by inputting the enhanced characteristic spectrum data into the model, thereby realizing rapid and accurate online detection of the components of the biomass raw material in the continuous conveying process.

The present application relates to the field of optical communication technology, in particular to a kind of optical fiber dispersion compensation adaptive amplification method and device thereof, comprising: obtaining the dispersion compensation value of dispersion compensation module;According to the total gain of dispersion compensation module, the dispersion compensation value is redistributed to multiple fiber amplifiers;According to the gain of each fiber amplifier after redistribution, the first expected attenuation value of the variable optical attenuator arranged in each fiber amplifier is calculated respectively, and the attenuation compensation amount of each variable optical attenuator is calculated according to the dispersion compensation value;According to the first expected attenuation value and attenuation compensation amount, the second expected attenuation value is calculated;According to the probe power of the first input end of variable optical attenuator and the probe power of the first output end, the actual attenuation value is calculated;Actual attenuation value and second expected attenuation value are compared, if consistent, then stop adjusting variable optical attenuator;Otherwise, continue to adjust.

Aspects of the present disclosure provide an amplifier chip comprising: an optical source configured to generate a plurality of beams, a plurality of output waveguides configured to convey the plurality of beams, a plurality of semiconductor optical amplifiers (SOAs), each of the plurality of SOAs configured to receive a respective beam from the plurality of waveguides and amplify the respective beam, and a plurality of output couplers configured to output the plurality of amplified beams from the amplifier chip. The apparatus further comprises a silicon photonic integrated circuit (SPIC), comprising: a plurality of input couplers, where each of the plurality of input couplers is aligned with a respective output coupler on the amplifier chip so as to receive the plurality of amplified beams, and optical processing circuitry disposed on the SPIC and configured to receive and process one or more of the amplified beams from the plurality of input couplers.

The invention discloses a management device for a quantum key distribution (QKD) system and a quantum communication system, and relates to the technical field of quantum communication, the management device for the QKD system comprises a light intensity management module and a spectrum management module, the light intensity management module at least comprises a first light intensity manager and a second light intensity manager, and the spectrum management module comprises a spectrum management module. The first light intensity manager comprises a first optical switch, a first optical fiber interferometer, a first variable optical attenuator, a first intensity modulator and a first light beam combiner, and the second light intensity manager comprises a second optical switch, a second optical fiber interferometer, a second variable optical attenuator, a second intensity modulator and a second light beam combiner. The first light intensity manager is respectively connected with the transmitting end of the QKD system and the spectrum management module, and the second light intensity manager is respectively connected with the transmitting end of the QKD system and the spectrum management module; and the spectrum management module comprises a dispersion compensation module, a filter and a plurality of wavelength division multiplexers, so that the complexity of light path construction is reduced, and integration is facilitated.

The invention discloses a method for improving attenuation speed of an optical attenuator, which comprises the following steps of: converting an optical attenuation value A set by a user into a code value B of a motor coding disc, and recording a motor initial code value; according to a set acceleration interval C1, a set deceleration interval C2 and a set constant speed interval C3, the current interval P of the motor is judged; if P is greater than or equal to C1, driving the motor to do accelerated motion by using the constant forward voltage V until P is greater than or equal to C1; if P is greater than or equal to C1, the motor moves at a constant speed; at the moment, the motor performs decelerating motion according to a constant deceleration track; and when the set attenuation position is reached, the motor stops, and attenuation response is completed. According to the invention, a segmented control method is used, so that the final overshoot can be reduced, the higher speed of the motor in the middle stage can be ensured, and the accuracy and the attenuation speed of light attenuation are further improved.

The invention discloses a high-integration-level multi-core optical fiber attenuator with each independently adjustable core, and relates to the field of optical fiber communication, the optical fiber attenuator is configured to be a high-integration-level optical fiber attenuation device which realizes dynamic adjustment of optical power through multi-core independent control, and the optical fiber attenuation device is configured in an airtight packaging structure. The optical fiber attenuation device comprises a multi-core optical fiber, a lens black box and an attenuation element array, the multi-core optical fiber is provided with a multi-core input optical fiber and a multi-core output optical fiber, and the multi-core input optical fiber, the lens black box, the attenuation element array and the multi-core output optical fiber are sequentially arranged in space; according to the optical fiber attenuator, the lens black box is introduced to serve as a general light beam separation and collimation module, a modularized and configurable optical attenuator framework is constructed by utilizing the attenuation element array which is closely arranged and can be subjected to independent addressing control, and the optical fiber attenuator can be flexibly matched with a transmission type or reflection type optical path during application; and independent and accurate regulation and control of each core light beam of the multi-core optical fiber can be realized.

The present application relates to the technical field of optical communication devices. Disclosed is an optical module. The optical module comprises a light source assembly and an optical amplification assembly, wherein the optical amplification assembly is optically connected to the light source assembly, and the optical amplification assembly is used for performing optical amplification on an optical signal which is output by the light source assembly, so that the optical module has a relatively high output power. Moreover, in the present application, a pump source device of the optical amplification assembly is arranged on a bearing surface on one side of a main circuit board, and a variable optical attenuator is arranged on a bearing surface on the other side of the main circuit board. That is, by rationally arranging functional devices of the optical amplification assembly, the size of the optical module can meet protocol requirements, and the optical module can accommodate the added optical amplification assembly, so that the optical module has a high output power.

The invention discloses a device and a method for testing the isolation of a transmitting-receiving optical module of a laser communication system, and the method comprises the steps: transmitting a laser beam with the transmitting wavelength of the laser communication system through a communication light source, enabling the laser beam to pass through a polarizer and an adjustable optical attenuator, and carrying out the beam splitting through an optical fiber beam splitter for optical power monitoring and light beam collimation; the collimated Gaussian beam is reflected and returned through a polarization beam splitter (PBS) and a light returning device, at the moment, a small part of light penetrates through the PBS and is coupled into a receiving optical fiber through a focus lens group, and an optical power synchronous acquisition unit can monitor the interference optical power coupled into the receiving optical fiber; and finally, the isolation of the to-be-tested transmit-receive optical module is calculated through the data analysis unit, and the isolation test is completed. According to the invention, the characteristic that the PBS in the transmit-receive optical module has different performances on the transmission and reflection of the s / p polarized light is utilized, and the measurement of the high dynamic range of the isolation of the transmit-receive optical module is realized by directly comparing the power of the communication transmitted light with the power of the interference light entering the receiving optical fiber.