58 results about "Mode division multiplexing" patented technology

Aspects of the disclosure relate to wireless communication including mode division multiplexing of data and reference signals using different orbital angular momentum (OAM) modes. An OAM transmitter may transmit a reference signal (RS) configuration information to an OAM receiver that indicates radio resources for a plurality of OAM modes. The OAM transmitter may further transmit data on a first OAM mode of the plurality of OAM modes using first radio resources of the radio resources indicated by the RS configuration information. The OAM transmitter may further transmit a reference signal on a second OAM mode of the plurality of OAM modes using the first radio resources of the radio resources indicated by the RS configuration information. The OAM receiver may receive the data on the first OAM mode and the reference signal on the second OAM mode. Other aspects, embodiments, and features are also claimed and described.

The invention discloses a relay device and method for long-distance few-mode optical fiber communication, and belongs to the field of optical communication. According to the device, firstly, optical signals transmitted in a few-mode optical fiber are separated into a plurality of independent mode channels through a mode decomposition multiplexer; then, an adjustable light delay unit is configured in each channel, and compensation is carried out according to a difference mode group delay difference pre-calculated or actually measured by a few-mode optical fiber parameter; furthermore, a dimmable amplifier is used for amplifying the signal, power monitoring is carried out at the output end of the amplifier through an optical fiber beam splitter and a photoelectric detector, closed-loop feedback control is formed, and gain of each channel is adjusted in a self-adaptive mode to eliminate mode-dependent loss. According to the invention, signal distortion can be effectively suppressed in an optical domain, the complexity of digital signal processing of a receiving end is reduced, and the transmission distance and the transmission capacity of a few-mode optical fiber mode division multiplexing communication system are remarkably improved.

An optical communication system can include a multiplexer / demultiplexer. The multiplexer / demultiplexer can transfer a first optical data signal between a first single-mode fiber and a first propagation mode of a few-mode fiber. The first propagation mode can have a first effective refractive index. The multiplexer / demultiplexer can transfer a second optical data signal between a second single-mode fiber and a combination of a second propagation mode of the few-mode fiber and a third propagation mode of the few-mode fiber. The second propagation mode and the third propagation mode can have a same effective refractive index that differs from the first effective refractive index. During propagation within the few-mode fiber, the second optical data signal can couple bidirectionally between the second propagation mode and the third propagation mode, while being substantially isolated from the first optical data signal in the first propagation mode.

The invention provides a single-port input / output multi-state adjustable waveguide mode converter and a preparation method thereof, and belongs to the technical field of on-chip silicon-based polymer hybrid integrated waveguide mode converters. According to the invention, a double-layer MZI parallel combination structure is adopted, independent electrodes are configured at specific positions of interference arms, and corresponding modulation signals are applied, so that accurate regulation and control of an input light field are realized. When E00-mode signal light is input, the structure can dynamically realize the conversion function of three modes of E00 / E01 / E10 on the premise of keeping single-port output, and the mode conversion efficiency reaches 95%. And the device is compatible with a standard silicon-based CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process, is beneficial to reducing the manufacturing cost and promoting large-scale integrated application, is suitable for the fields of a high-capacity mode division multiplexing system and multi-dimensional optical signal processing, and can meet the urgent requirements of modern optical communication on high-integration-level, reconfigurable operation and low-cost devices.

The invention relates to an underwater point cloud data transmission system and method based on vortex light mode division multiplexing, and the system comprises a point cloud data transmission module which is used for modulating the three-dimensional point cloud data of a measured target into two paths of laser signals, carrying out the first preprocessing of the two paths of laser signals, and transmitting an underwater space light signal; and the point cloud data receiving module is used for receiving the underwater space optical signal, performing second preprocessing on the underwater space optical signal, and generating user service data. According to the invention, a double-path vortex optical space division multiplexing technology is adopted, synchronization of target detection and data return is realized, and key technical problems of poor real-time performance, weak anti-interference capability and the like in the aspect of underwater three-dimensional point cloud data acquisition are effectively solved.

The application discloses a device and method for coexistence of bright-dark solitons based on a mode division multiplexing resonant cavity, and relates to the technical field of lasers.The device for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity comprises an erbium-doped fiber amplifier, a first optical coupler, an acousto-optic frequency shifter, a second optical coupler, a third optical coupler, a first mode selection coupler, a second mode selection coupler and a fiber ring resonant cavity, and the fiber ring resonant cavity is a non-uniform dispersion few-mode fiber.The device and method for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity can realize stable coexistence of bright-dark solitons.

The application discloses a mode division multiplexing all-optical regenerative device, which comprises a polarization controller, a few-mode amplifier, an optical coupler, a few-mode nonlinear optical fiber, an optical carrier extractor and an optical phase shifter. Mode division multiplexing signals of multi-level pulse amplitude modulation from different users can be simultaneously regenerated by the mode division multiplexing all-optical regenerative device, the regenerated mode division multiplexing signals are amplified and shaped, and the power transfer curve of each mode channel is not affected by the change of other mode levels.

A mode insensitive 2x2 thermo-optic switch for mode division multiplexing system belongs to the technical field of planar optical waveguide devices. It is composed of a silicon substrate, a silicon dioxide lower cladding layer, a polymer core layer waveguide and a polymer upper cladding layer. The polymer core layer waveguide is composed of a first input straight waveguide and a second input straight waveguide, a first input S curved waveguide and a second input S curved waveguide, a first coupling arm straight waveguide, a second coupling arm straight waveguide and a third coupling arm straight waveguide, a first output S curved waveguide and a second output curved waveguide, and a first output straight waveguide and a second output straight waveguide. A metal modulation electrode is prepared on the polymer upper cladding layer corresponding to the second coupling arm straight waveguide. The present application realizes the channel switching of LP 01 , LP 11a and LP 11b three modes by adjusting the spacing and coupling length of the coupling arm straight waveguide and whether to apply the modulation electrode, which has important significance in the field of mode division multiplexing applications.

The invention discloses an apodized FBG circle-by-circle inscribing system and method based on a variable radius method, and relates to the technical field of optical fiber inscribing, and the system comprises a laser beam shaping module, an optical fiber track control module and an optical fiber real-time monitoring module. The laser beam shaping module generates laser and focuses the laser to form a refractive index modulation area; the optical fiber real-time monitoring module monitors the side mode rejection ratio and the reflectivity of a reflection spectrum in real time, observes the pose of the ring core optical fiber and adjusts the pose through the optical fiber track control module, and it is ensured that a modulation area is located on the fiber core all the time. The optical fiber track control module clamps the ring core optical fiber, controls the ring core optical fiber to move on the Y axis and the Z axis according to sine and cosine functions respectively to form an annular inscribing track and step along the X axis (axial direction) according to a preset grating period, and the radius of each annular track changes along the X axis according to Gaussian-like distribution to achieve apodization distribution. The system effectively improves the side mode suppression ratio to 20-25dB (optimal Gaussian distribution), keeps high reflectivity, remarkably improves the spectrum quality, and is suitable for the fields of mode division multiplexing, optical fiber sensing and the like.

The application relates to a mode conversion and multiplexer based on a zirconium oxide waveguide, which comprises a zirconium oxide waveguide layer, the zirconium oxide waveguide layer comprising a first waveguide, a second waveguide and a third waveguide, the first waveguide comprising a first input waveguide, a first coupling waveguide, a first straight waveguide, a second coupling waveguide and a first output waveguide; the second waveguide comprising a second input waveguide and a third coupling waveguide; the third waveguide comprising a third input waveguide and a fourth coupling waveguide; a coupling area formed by the first coupling waveguide and the third coupling waveguide converts fundamental mode light in the third coupling waveguide into second-order mode light, and the first straight waveguide transmits the second-order mode light and the fundamental mode light; a coupling area formed by the second coupling waveguide and the fourth coupling waveguide converts fundamental mode light in the fourth coupling waveguide into third-order mode light, and the first output waveguide transmits the third-order mode light, the fundamental mode light and the second-order mode light. The application can solve the problem of a relatively large size of a mode division multiplexer based on a polymer in the related art.

A non-degenerate mode few-mode multiplexer / demultiplexer based on a four-core transmission main channel is characterized in that a transmission channel of the mode division multiplexer / demultiplexer is composed of an elliptical four-core super-mode fiber core FEC-SFC and three single-mode fiber cores, the elliptical four-core super-mode fiber core at the coordinate center serves as the transmission main channel, and the single-mode fiber cores SMF1, SMF2 and SMF3 are transmission coupling channels; the length of the transmission main channel FEC-SFC is 3.588 mm, and the lengths of the SMF1, the SMF2 and the SMF3 are respectively 3.588 mm, 1.658 mm and 1.808 mm; the mode field characteristics in the optical fiber can be changed by reasonably setting parameters such as the position, the size and the refractive index distribution of the fiber core; according to the ultra-mode fiber core, the advantages of a pure silicon dioxide fiber core, an elliptical core and an ultra-mode fiber core are fused, the mode degeneracy of LP11a / LP11b is broken, four ultra-mode multiplexing and demultiplexing of LP01, LP11a, LP11b and LP21b are achieved, the refractive index fiber core made of pure silicon dioxide is adopted, and the low-loss performance is achieved; a transmission channel with a large effective refractive index difference is adopted, and the position and the length of the transmission channel are reasonably set, so that the low-crosstalk and high-extinction-ratio performance is realized, and the low-crosstalk and high-extinction-ratio optical fiber can be used for MIMO-FREE operation.

The invention discloses a mode division multiplexing device based on topological optimization and a mode division multiplexing circulating system, and relates to the field of photon integration and optical communication. The manufacturing method of the mode division multiplexing device comprises the following steps: dispersing the whole design area into adjustable material pixels, wherein the design area is silicon on insulator; determining a target function of a mode division multiplexing device by taking maximization of mode conversion efficiency as a target; by taking the objective function as an optimization objective, automatically updating the distribution of material pixels in the whole design area to obtain a quasi-optimal structure; and optimizing the pixels which cannot meet the manufacturing requirements in the optimal structure until the manufacturing requirements can be met. When a mode division multiplexing device is manufactured, an optimal structure can be automatically searched in a continuous or discrete material parameter space, so that a complex geometrical shape which is difficult to intuitively conceal can be excavated, and ultra-compact, low-loss, low-crosstalk, broadband and robust mode division multiplexing multifunctional photonic devices and the like can be realized in an extremely small size.

The application discloses a compact fiber bundle and spatial vortex beam mode multiplexer and a diffraction optical element height distribution optimization method for the mode multiplexer, relates to the field of optoelectronics, and the mode multiplexer comprises a filter, a first diffraction optical element, a second diffraction optical element, a microlens array, a flange connector and a fiber bundle arranged in sequence from left to right along the light path direction, and an external sleeve; the first diffraction optical element and the second diffraction optical element are both annular structures, and the two constitute a diffraction neural network, realizing the multiplexing function and the demultiplexing function of the spatial vortex beam. The diffraction optical element height distribution optimization method comprises the following steps: determining the phase modulation amount of each region based on a phase distribution function, and determining the height distribution of each region based on the phase modulation amount. The application provides a feasible technical path for realizing a high-integration, low-crosstalk mode division multiplexing device, and has a wide application prospect.

The invention provides an optical chip for atom regulation and control and a regulation and control method, and belongs to the technical field of optical signal processing. The optical chip comprises a chip substrate, an optical waveguide integrated on the chip substrate, an acousto-optic modulator, an external port and a port facing an atomic array. The acousto-optic modulator generates sound waves through an interdigital transducer, and the sound waves interact with the optical signals in the acousto-optic interaction waveguide, so that at least one of the amplitude, the phase, the polarization, the frequency, the transverse mode and the transmission direction of the optical signals is accurately adjusted. The optical chip can also be integrated with a nonlinear optical frequency conversion module for changing the frequency of the optical signal; and the optical signal multiplexing module is used for performing beam splitting, filtering, frequency division or mode division multiplexing and the like on the optical signal. The external port is used for inputting / outputting optical signals, and the port facing the atom array outputs the optical signals to the atom array in a free space light beam mode and can collect the optical signals emitted by atoms.

The present invention discloses a four-mode mode division multiplexing / demultiplexing device based on Y-branching and multimode interference couplers. The device includes a four-mode multiplexer and a four-mode demultiplexer. The four-mode multiplexer and the four-mode demultiplexer multiplex four transmission modes through a four-mode bus waveguide. The four-mode multiplexer and the four-mode demultiplexer are mirror-symmetric structures, each composed of a dual-mode Y-waveguide, a four-mode Y-waveguide, a 2×2 single-mode input paired interferometer (MMI) type, and a 2×2 multimode input general interferometer (MMI) type basic unit. The present invention achieves four-mode multiplexing and demultiplexing by controlling the mode phase in the Y-waveguide and the MMI multimode coupler. The four-mode mode division multiplexer and demultiplexer have low loss, wide bandwidth, compact size, and wide manufacturing tolerance.

The invention discloses an optical fiber collimator, isolator and circulator in an orbital angular momentum mode, and belongs to the field of optoelectronic communication devices. Based on a special optical fiber collimator design scheme, the OAM optical fiber collimator which is simple in structure and excellent in performance is realized. On the basis of an OAM optical fiber collimator, an isolation core and an annular core are combined, and an OAM optical fiber isolator and an OAM optical fiber circulator which are low in cost, low in processing complexity, small in occupied size and excellent in performance are respectively realized through a special packaging process. The isolator and the circulator have the characteristics of low insertion loss, high isolation degree, high quality of a transmitted OAM mode and the like. The OAM optical fiber collimator, isolator and circulator realized by the invention can replace free space optical devices with consistent functions in systems such as an OAM mode optical fiber communication system, an OAM optical fiber amplifier and the like. The cost of the mode division multiplexing optical fiber communication system based on the OAM mode is reduced, the flexibility of the system is improved, and the method has important significance for promoting the practicability and miniaturization of the optical fiber communication system.

The invention provides a multi-core optical fiber type nine-mode mode division multiplexer with a high-refractive-index ring, and relates to the technical field of optical fiber communication. The multi-core optical fiber type nine-mode mode division multiplexer comprises a substrate material, a central few-mode fiber core and a peripheral single-mode side core, wherein the central few-mode fiber core and the peripheral single-mode side core are positioned in the substrate material; the central few-mode fiber core comprises a fiber core substrate and a high-refractive-index ring located in the fiber core substrate, and the axis of the fiber core substrate coincides with the axis of the high-refractive-index ring; the peripheral single-mode side core comprises single-mode fiber cores which convert an LP21a mode, an LP31a mode, an LP12 mode, an LP02 mode, an LP11b mode, an LP21b mode, an LP11a mode and an LP31b mode to the central few-mode fiber core, and the single-mode fiber cores are sequentially distributed on the periphery of the central few-mode fiber core. The signal transmission quality and stability can be improved.

Embodiments of an optical amplification apparatus are disclosed which include a first optical amplifier, a second optical amplifier, and a mode exchanger. The first optical amplifier is connected to an input port of the mode exchanger, and the second optical amplifier is connected to an output port of the mode exchanger. The first optical amplifier is configured to amplify optical signals carried in a plurality of transmission modes of a few-mode fiber, the plurality of transmission modes of the few-mode fiber may be grouped into N groups, each group includes two transmission modes, and N is a positive integer greater than or equal to 1. The mode exchanger is configured to exchange the two transmission modes carrying optical signals in each group. The second optical amplifier is configured to amplify the optical signals that are carried in the two transmission modes in each group and whose modes are exchanged.

The application discloses a nonlinear impairment equalization method for a mode division multiplexing (MDM) communication system, and belongs to the optical fiber communication field. The method is implemented as follows: an optical amplitude modulation (OAM)-MDM optical fiber communication system transmits and receives a pulse amplitude modulation (PAM) signal sequence, and a data feature vector is constructed by using received PAM data symbols; a training data set is used to train an equalizer; a test data set is input into an AffinityNet equalizer to obtain a predicted value of a signal, and high-accuracy data recovery is realized. The AffinityNet uses a "small sample" to establish an accurate nonlinear model and has a high generalization ability to predict the random characteristic nonlinearity of the OAM-MDM. The AffinityNet nonlinear equalizer can effectively compensate the random nonlinearity in the OAM-MDM system through the nonlinear model learned by the small sample. The application has a lower calculation complexity, can efficiently recover the data symbols transmitted in the OAM system, and compensates the system nonlinearity of the OAM optical communication system.

The invention relates to an optical neural network topology adaptive mode division multiplexing communication system and a training method, and the method provided by the invention is applied to a mode division multiplexing communication system, and is used for solving the problem that the transmission or calculation performance is reduced due to dynamic coupling crosstalk of a spatial mode caused by environmental disturbance. The method comprises the following steps: monitoring the output of an optical neural network in real time, and generating a state matrix representing mode crosstalk; extracting matrix features to construct an environment vector; through a pre-trained deep reinforcement learning network, a reconstruction action for controlling the adjustable photonic device is decided and generated according to the vector; the driving device dynamically adjusts the network physical topology to compensate crosstalk; and finally, optimizing the strategy network on line based on the reconstructed performance evaluation result to form a closed loop. According to the method, the optical neural network in the mode division multiplexing has online self-adaptive capability, the dynamic mode crosstalk can be continuously inhibited, and the stability and high performance of the system in actual deployment are guaranteed.

This invention provides a mode-division multiplexing (MDF) system, method, device, and storage medium, relating to the field of optical communication technology. The MDF system includes at least: multiple cascaded optical fiber transmission units across multiple spans and a central controller. Each optical fiber transmission unit includes multimode or few-mode fiber and a mode adjustment unit. The mode adjustment unit calculates the transmission parameters of the optical fiber transmission unit and sends these parameters to the central controller. The central controller acquires the transmission parameters of the optical fiber transmission units in each span, generates a target mode round-robin strategy for the corresponding span, and sends it to the mode adjustment unit to update the optical signal module. The central controller adaptively selects the target mode round-robin strategy based on the real-time transmission environment, adaptively adjusting each span to reduce differential mode group delay (DMD) and mode-dependent loss (MDL), adapting to different span lengths and different transmission environments, and improving the transmission performance of multimode or few-mode fiber.

The application discloses a CNN-LSTM-based phase calibration method for mode division multiplexing optical fiber communication and belongs to the technical field of optical fiber communication. By constructing a double-input CNN-LSTM hybrid neural network architecture, MIMO input signals and original target signals of mode division multiplexing optical fiber communication are acquired, data preprocessing is carried out, the spatial feature extraction capability of a convolutional neural network and the time series modeling capability of a long short-term memory network are combined, effective compensation of phase noise in long-distance strong coupling mode division multiplexing optical fiber communication is realized, complex MIMO signals are separated into real and imaginary parts and sliding window training samples are generated, and a double-branch network containing an image input layer, a convolutional layer, an LSTM layer, a deep connection layer and a self-defined phase calibration layer is constructed. The problems that the phase noise compensation capability of a traditional algorithm is limited and the convergence performance is poor under a strong coupling condition are effectively solved, and the equalization performance and transmission quality of a mode division multiplexing optical fiber communication system are significantly improved.

The invention relates to the technical field of artificial intelligence, and discloses a data processing method based on a photoelectric neural network, a chip, equipment and a medium. The existing problems are solved by optimizing the signal processing and transmission architecture: the mode division multiplexing technology of the orthogonal mode is adopted, the optical routing module can transmit multiple groups of data in parallel in a single route, the dependence on multiple active devices is reduced, and the area proportion of the active devices in a chip is reduced; the electro-optical conversion module intensively processes electric signal light conversion data, so that area waste caused by scattered layout is avoided, and the integration level is improved; optical data is transmitted to each calculation module through branches, parallel calculation is realized, resource allocation is optimized in combination with a task scheduling rule, and the calculation power density is improved; the modular design enables the calculation module to be expanded as required, enhances the expandability of the system, and gives full play to the advantages of high bandwidth and low loss of optical calculation.

This invention belongs to the field of optical fiber communication technology, specifically relating to a seven-core, seven-mode mode divider multiplexer based on the mode coupling principle, comprising a substrate material, a central few-mode fiber core, and peripheral single-mode fiber cores; the central few-mode fiber core contains a high-refractive-index ring; the peripheral single-mode fiber cores include components for LP (Laser-Parse) coupling to the central few-mode fiber core. 11 The first single-mode fiber core for mode conversion is used for LP to the central few-mode fiber core. 31 The second single-mode fiber core for mode conversion is used for LP to the central few-mode fiber core. 21a The third single-mode fiber core for mode conversion is used for LP to the central few-mode fiber core. 02 The fourth single-mode fiber core for mode conversion is used for LP to the central few-mode fiber core. 21b The fifth single-mode fiber core for mode conversion and the LP for the central few-mode fiber core. 12 The sixth single-mode fiber core for mode switching. This invention features a large number of switching modes, high space utilization, low insertion loss, and high throughput.

The application discloses an optical mode selection switch, comprising a platform, the platform surface is fixedly connected with a spatial light modulator, an optical processing device and a phase modulation module, the spatial light modulator, the optical processing device and the phase modulation module are parallel to each other, the optical processing device is located between the spatial light modulator and the phase modulation module, a plurality of phase units are uniformly fixed on the phase modulation module, the phase modulation module is a mode demultiplexing element array module, and the phase unit is a mode demultiplexing device unit of the same coordinate transformation or multi-plane light field conversion. The application can carry out N mode inputs, N mode outputs, and can freely select, separate and group propagation modes, improve the freedom degree of mode selection, and is not limited to optical fiber input or spatial light input, optical fiber or spatial light output, so that the mode division multiplexing is not limited to being carried out in an optical waveguide.

The application provides a two-channel grating-assisted reverse coupler type dispersion compensator, comprising a mode division multiplexer, a reverse coupler, a straight waveguide, a tapered waveguide and a curved waveguide; the mode division multiplexer is a micro-ring-based mode division multiplexer, and the reverse coupler is a chirped grating-assisted reverse coupler; the straight waveguide is connected with the mode division multiplexer through the curved waveguide; the straight waveguide is connected with the mode division multiplexer through the tapered waveguide; the mode division multiplexer is connected with the reverse coupler through the tapered waveguide; and the straight waveguide is connected with the reverse coupler through the curved waveguide. The application separates the input light and the reflected output light by using the reverse coupling between two waveguides based on the Bragg condition, is equivalent in function to a Bragg grating with input and output separation, does not need an additional optical circulator or other light splitting devices, and reduces the integration difficulty of the device.

An alcohol gas concentration remote sensing device based on mode division multiplexing transmission relates to the field of biomedical measurement technology. It aims to solve the problems of low measurement accuracy and high false alarm rate in the process of non-contact measurement of alcohol content in human exhaled breath. The device comprises a semiconductor laser, an erbium-doped fiber amplifier, a wavelength division multiplexer, a thulium-holmium co-doped double-clad fiber, a few-mode optical isolator, a mode selector, a few-mode optical coupler, a polarization controller, a second optical coupler, a first optical coupler, a first optical fiber collimator, a Kepler beam compressor, a two-color beam splitter, a first receiving lens, a first photodetector, a second receiving lens, a few-mode receiving fiber, a mode demultiplexer, a second photodetector, a third photodetector, a fourth photodetector, an analog-to-digital converter, an FPGA, and a microcomputer. According to the different alcohol absorption laws of different mode light beams during the test or analysis of the alcohol content in human exhaled breath, the receiving end performs multi-mode diversity reception, and the alcohol content is deciphered in multiple modes to improve the measurement accuracy.

The present invention discloses a multimode waveguide coupler based on a multiphase plane, belonging to the field of optoelectronic communication devices. Combining two-photon polymerization femtosecond laser processing technology, the multiphase plane and microlens structure are utilized to achieve coupling conversion between the modes supported by multimode optical fiber and the modes supported by on-chip multimode waveguides, with low loss and low crosstalk. This invention achieves coupling conversion between the modes supported by multimode optical fiber and the modes supported by on-chip multimode waveguides, overcoming the limitations of mode division multiplexing technology in fiber-chip optical interconnect systems and promoting further improvements in the transmission capacity of optical interconnect systems.

The application discloses a channel construction method for a passive optical network communication system and belongs to the optical fiber communication field. The method is as follows: based on the M-QAM signal sequence after synchronization processing, the current M-QAM signal is regarded as real data. The condition vector and the real data are combined to construct a training data set, and a TFPNet network model for channel construction of the passive optical network system is constructed. The TFPNet network model is trained with the combination of the real data and the condition vector as an input feature sequence, fully processes signal features, and can combine and utilize the previous signal data information in the training data to perform sequence feature fusion on the signal data sequence when processing the signal data at the current moment, so that the nonlinear interference relationship between the current signal and the previous signal is better represented. The application has lower calculation complexity, can efficiently recover the data symbols transmitted in a wavelength division multiplexing system, and compensates for linear damage and nonlinear damage in the passive optical network optical communication system.

The invention discloses a photon lantern mode crosstalk characterization device and method in a mode division multiplexing system, and belongs to the field of optical communication. The method can be used for performance evaluation and optimization of the multimode photon lantern in a mode division multiplexing system. According to the method, a wavelength mapping measurement method is used, and modes are in one-to-one correspondence with wavelengths, namely multiplexing and demultiplexing of the modes are converted into multiplexing and demultiplexing of the wavelengths; the specific method comprises the steps that light with different wavelengths emitted by the three lasers is input through the single-mode input end of the first photon lantern and output through the few-mode end of the first photon lantern, then the light is input through the few-mode end of the second photon lantern, and the received light is decomposed at the single-mode port of the second photon lantern through the wavelength division multiplexer according to different wavelengths; optical power meters are respectively used for optical power measurement, and crosstalk conditions of different modes of the photon lantern under the combined action of multiple channels can be obtained through calculation.