39 results about "Polarimetry" patented technology

Polarization BRDF characteristic measuring device and method, belong to optical measurement technical field, the present application is to solve the existing BRDF or polarization BRDF measurement slow, low efficiency problem of measurement.The scheme of the present application: the laser light source at the second focal point emits laser light vertically through the circularly polarized light generating system and the polarizing system, the circularly polarized light generating system converts the laser light emitted by the laser light source into circularly polarized light, the polarizing system quantitatively changes the polarization state of the circularly polarized light to form the measuring incident light, the incident light is transmitted through the transmission light of the half mirror, and is reflected by the ellipsoidal mirror to the surface of the sample to be measured at the first focal point, the reflected light wave of the surface of the sample to be measured is reflected again by the inner surface of the ellipsoidal mirror, and is transmitted to the second focal point direction and is reflected by the half mirror, and the reflected light wave is converged to the third focal point of the measuring system through the polarizing system, the polarizing system is adjusted with the polarizing system, and the polarization BRDF characteristic of the sample to be measured is measured.

The invention discloses a non-contact polarization image measuring device and method for a large-size PBX curing process. The non-contact polarization image measuring device comprises a three-dimensional sample table, a diaphragm, a zoom lens, a micro-polarization array and a detector which are arranged along a light path direction, a sample to be tested is placed on the three-dimensional sample table, and the center of the sample to be tested coincides with the center of the three-dimensional sample table; the diaphragm realizes normalization processing of emergent light energy by regulating and controlling the intensity of reflected light on the surface of the sample; the zoom lens collects normalized emergent light to the surface of the micro-polarization array, and is adjusted and matched with the z-axis of the three-dimensional sample table to realize scanning imaging of a to-be-detected sample in the depth direction; the detector acquires a linear polarization image. According to the method, the PBX is measured through non-contact polarization, high-precision characterization analysis of the PBX curing process is completed by calculating key parameter (polarization angle and polarization degree) changes caused by curing, and the problems of pollution, large error and high danger of a sample in traditional contact measurement are solved.

This application discloses a method and related apparatus for obtaining a phase retardation map and a fast axis orientation map of the cornea. The method includes inputting a preset polarization state into a metasurface polarization analyzer to obtain polarization measurement data output by the metasurface polarization analyzer; solving for polarization state matrix parameters based on the polarization measurement data; and decomposing the polarization state matrix parameters to obtain a phase retardation map and a fast axis orientation map of the cornea. Using this application embodiment, subtle microstructural changes in the cornea can be captured with high sensitivity, compensating for the lack of quantitative analysis methods in traditional slit-lamp examinations, while effectively overcoming the problem of insufficient accessibility caused by the large size and high cost of traditional high-end detection equipment.

The invention belongs to the field of polarization measurement, and particularly relates to a space solar spectrum magnetic field telescope based on multi-wave-plate polarization modulation, which comprises a telescope system, a relay system and a spectrum imaging system, the telescopic system comprises a first 1 / 2 wave plate, a 1 / 4 wave plate and a second 1 / 2 wave plate; when neither the first 1 / 2 wave plate nor the second 1 / 2 wave plate fails, the second wave plate is kept static, and the first wave plate and the third wave plate rotate in the same direction according to a preset different-speed asynchronous motion time sequence, so that the full-stokes component of the solar polarization spectrum is measured; when any one of the first 1 / 2 wave plate and the second 1 / 2 wave plate breaks down, the 1 / 4 wave plate is started, and the 1 / 4 wave plate and the other normally working 1 / 2 wave plate rotate in the same direction according to the re-planned different-speed asynchronous motion time sequence, so that the measurement of the full stokes component of the solar polarization spectrum is maintained. According to the invention, full Stokes measurement can be realized, and the blank of space solar vector magnetic field detection capability in China is filled.

This application relates to the field of optical polarization measurement technology, specifically to a wide-spectrum, high-bandwidth static spectral modulation Stokes polarization measurement device, comprising a polarization modulation module, a spectral sampling module, and a high extinction ratio polarizer. The polarization modulation module includes a phase retarder and a linear polarizer; the spectral sampling module has sub-nanometer spectral resolution; the high extinction ratio polarizer includes a halogen tungsten lamp and a Glan Taylor prism for generating high-purity linearly polarized light; the obtained demodulation factor and the modulation spectrum acquired by the spectral sampling module are used to invert the Stokes parameters using zero-heterodyne coherent demodulation technology. This application employs a phase retarder with high birefringence, which, for the same thickness, produces an optical path difference tens of times greater than that of quartz, increasing the Stokes polarization measurement bandwidth by a factor of the response and improving the measurement accuracy of polarization spectral parameters. Simultaneously, the zero-heterodyne coherent demodulation method is used to eliminate the dispersion interference of the phase retarder through calibration.

The application discloses a confocal full Mueller matrix imaging device and method based on a fiber super surface array, and belongs to the technical field of polarized optical imaging. The device comprises a fiber array multi-polarization illumination module, a sample scanning module, a scattered light transmission module, a super surface array polarization modulation module and a polarized light intensity detection module. The polarization state of four beams of light is regulated by a fiber polarization controller, and four illumination focal spots with different polarization states are generated simultaneously on a sample plane. The sample scattered light is modulated by a polarization measurement super surface array comprising four independent super surface units, and the polarization state of each light signal is projected onto sixteen spatially separated polarized light spots. Finally, the light spot intensity information is collected by a surface array detector, and the full Mueller matrix image of the sample is reconstructed by calculation. The application realizes the acquisition of full Mueller matrix information in a single scan, has the characteristics of high resolution, compact structure and good compatibility, and can be used for multi-dimensional polarization microscopic analysis of samples.

The present invention relates to a polarimetric (PT) measurement device for anisotropic quantities of a medium (M), comprising a spectrally structured light source (SSS) delivering a series of pulses with reference spectral grooves, spectral polarization coding means (MPG) configured to spectrally polarize each of the reference pulses delivered by the light source with a measurement phase delay identical to the reference phase delay, a light detector (D) configured to capture the light intensity reflected by the medium (M) for each of the reference pulses delivered by the light source, and a measurement unit configured to determine the anisotropic quantities of the medium (M) from the images captured by the detector. Figure 3

The present invention relates to a polarimetric (PT) measurement device for anisotropic quantities of a medium (M), comprising a spectrally structured light source (SSS) delivering a series of pulses with reference spectral grooves, spectral polarization coding means (MPG) configured to spectrally polarize each of the reference pulses delivered by the light source with a measurement phase delay identical to the reference phase delay, a light detector (D) configured to capture the light intensity reflected by the medium (M) for each of the reference pulses delivered by the light source, and a measurement unit configured to determine the anisotropic quantities of the medium (M) from the images captured by the detector. Figure 3

The invention discloses a fiber grating demodulation system and demodulation method based on a polarization measurement technology, and a corresponding grating weighing sensor, and belongs to the technical field of optical fiber sensing. The system comprises a broadband light source, a circulator, a grating weighing sensor, a polarizer, an optical fiber delayer, a polarization beam splitter, a first photoelectric detector, a second photoelectric detector, a data acquisition card and a demodulation module. According to the method, reflected light of the sensor is changed into linearly polarized light through the polarizer, the linearly polarized light is delayed and then divided into two paths of orthogonal components through the polarization beam splitter, the two paths of orthogonal components are converted into voltage signals, the demodulation module processes the two paths of signals through a differential balance algorithm, a phase delay angle related to wavelength change is extracted, and then the weight is calculated. The invention further provides a grating weighing sensor adopting the left-handed and right-handed fixing bolt and reinforcing bolt structure, and the grating weighing sensor is used for applying and keeping constant pretension force. According to the method, the problems of low precision and poor anti-interference performance of a traditional demodulation method are solved, and the accuracy and the stability of fiber grating weighing measurement are remarkably improved.

This invention belongs to the field of ultrafast spectroscopy technology, specifically relating to a system and method for parallel measurement of transient absorption spectroscopy and magneto-optical polarization. The system comprises: a femtosecond laser, a first beam splitter, a pump pulse adjustment component, a probe pulse adjustment component, a second beam splitter, a beam combiner, a focusing and imaging device, a third beam splitter, a spectral measurement device, and a polarization measurement device. This system can simultaneously measure transient absorption spectroscopy and magneto-optical polarization.

The invention discloses a polarization sensitive optical coherence tomography method and system based on single-state input. According to the method, polarized light in a single polarization state is injected into a sample, and fixed time delay is introduced into interference data of an orthogonal polarization channel, so that gradient phase difference linearly changing along with imaging depth is generated, and virtual modulation of the polarization state is realized. A polarization state matrix after phase compensation is constructed based on the gradient phase difference, and sample type discrimination and real local optical axis direction determination are synchronously completed by calculating a tangent vector, a normal vector and an auxiliary normal vector of the polarization state matrix according to the relation between the auxiliary normal vector and a Stokes space preset axis. The system can be adapted to an endoscopic OCT structure for rotary retracement scanning and a galvanometer OCT structure for reflection deflection scanning. According to the invention, while the advantages of simple structure and low cost of a single-state input system are maintained, the problems of failure in a weak birefringence region and deep tissue measurement distortion in a traditional method are effectively overcome, and the precision and reliability of local polarization measurement are remarkably improved.

The application discloses a kind of full polarization synchronous calibration methods of suspended particle measuring device, comprising the following steps: S1, with a variety of different polarization state incident polarized light is sequentially irradiated standard sample particle after scattering occurs, and the stokes vector of corresponding multiple actual exit polarized light is measured;S2, the stokes vector of the multiple actual exit polarized light is spliced into first matrix, the theoretical value of the stokes vector of multiple exit polarized light that step S1 can obtain under ideal condition is spliced into second matrix, and calibration matrix is obtained according to the first matrix and the second matrix;S3, when measuring suspended particle, the calibration matrix is used to calibrate measurement result. Thus, the calibration of multiple incident polarized light of the same particle is realized, the instrument calibration of multiple incident state is realized, and the steps and time of calibration can be greatly reduced.

The application discloses a polarization remote sensor short-wave infrared band polarization calibration method based on background radiation correction, and the method comprises the following steps: constructing a polarization response measurement model and a background radiance model, and measuring a Stokes vector of target radiation; adopting a wave band method to determine a background radiation polarization response mathematical model caused by an internal system of a remote sensor; acquiring a background radiation measurement matrix by using a light source and a polarization polarization system; determining a correlation coefficient between external background radiation and internal background radiation to establish a background radiation polarization response mathematical model caused by internal background radiation; according to an actual operation state of the polarization remote sensor, an improved inversion model of a polarization degree based on background radiation correction is established; and a comparison measurement normalized deviation method is adopted to verify the correction effect of the background radiation polarization response. The application can effectively solve the problems of background radiation caused polarization remote sensor short-wave infrared band background noise increase and dynamic range drift, and improve the polarization measurement precision.

This invention discloses a method for polarization detection based on the superposition of orthogonal vortex beams, comprising the following steps: An incident beam generated by a tunable laser passes sequentially through a linear polarizer and a quarter-wave plate (QWP). The transmission axis α of the linear polarizer and the fast axis β of the QWP are rotated to achieve an arbitrary polarization state in the transmitted beam. An optical lens is used to focus the incident light with the arbitrary polarization state. The beam reflected from the metasurface is then processed by an objective lens to magnify the beam. The focused incident beam illuminates the optical metasurface, and the composite beam generated from the metasurface is collected by a CCD camera after passing through an analyzer. This invention overcomes the problems of large size and poor integration inherent in traditional polarization measurement systems. Metasurfaces offer potential for vertical integration and design flexibility, and provide a new direction for combining polarization information with other related technologies. It also meets the requirements of device miniaturization and system integration.

The invention belongs to the field of polarization measurement, and particularly relates to a space solar spectrum polarization telescope based on a built-in filtering window assembly, the space solar spectrum polarization telescope comprises a telescope system, a relay system and a spectrometer imaging system which are sequentially arranged along a light path, the telescope system comprises a primary mirror, a secondary mirror and a built-in filtering window assembly, the secondary mirror is located in an emergent light path of the primary mirror, and the secondary mirror is located in a light path of the built-in filtering window assembly. The built-in filtering window assembly is located in an emergent light path of the secondary mirror; the built-in light filtering window assembly comprises at least two pieces of light filtering glass and a light filtering glass supporting piece, and the surface of each piece of light filtering glass is plated with a light filtering film layer with different transmission bandwidths. According to the large-aperture space solar spectrum polarization telescope, a front filtering window is omitted, and a built-in filtering window assembly is arranged in a light path, so that the bottleneck of restricting the weight, mechanics and thermal control of the large-aperture space solar spectrum polarization telescope is solved, and the optical performance, the system reliability and the engineering feasibility are comprehensively improved.

The application relates to the technical field of deep space exploration and planetary remote sensing, in particular to a lunar surface parameter monitoring device and method based on a satellite-borne GNSS-R and a compact polarization technology.The device comprises a satellite platform, a GNSS-R receiver, a compact polarization antenna array, an on-orbit processing unit, a data storage and telemetry module and a ground processing system.The method obtains dual-polarization components by receiving direct and moon-reflected signals of a multi-navigation satellite system; generates a delay Doppler map and extracts polarization bit features on orbit; inverses a lunar surface dielectric constant and roughness based on a physical model and a machine learning model; and generates products by the ground system after data storage and transmission.The application realizes high-precision, global coverage and high-frequency monitoring of key physical parameters of the lunar surface, the system has the characteristics of light weight, low power consumption and intelligence, and effectively makes up for the deficiencies of traditional detection technology in terms of time and space continuity, system complexity and cost.

The invention provides a low-sensitivity-oblique incidence double Stokes-Mueller polarization measurement optimization method, which comprises the following steps of: firstly, introducing the sum of two angles representing three-dimensional rotation of an element, so that a Mueller matrix can describe the condition of three-dimensional rotation of a polarization element, and further describe the effect of the polarization element on oblique incidence light; then, a polarization element Mueller matrix containing three-dimensional rotation is used for representing an instrument matrix of DSMP, the DSMP is optimized by using the matrix in combination with a minimum condition number and a genetic algorithm, the PSG rotation angle low in sensitivity to light oblique incidence is optimized, and high stability can be kept in actual measurement; therefore, the method can describe the effect of the polarization element on the oblique incident light or the effect of the polarization element in three-dimensional rotation on the normal incident light, but the existing method cannot describe the two conditions and only can describe the effect of the polarization element on the normal incident light; according to the method, the random error caused by oblique incidence of light in polarization measurement can be optimized, and the random error caused by oblique incidence of light is neglected in an existing optimization method.

The invention discloses a broadband full-Stokes parameter measurer based on a liquid crystal two-dimensional polarization grating, and belongs to the technical field of liquid crystal photonics. The problems that an existing polarization measurer is complex in preparation, large in system and limited in narrow band are solved. The liquid crystal display panel comprises two light-transmitting conductive substrates which are oppositely arranged, the opposite surfaces of the substrates are spin-coated with photosensitive orientation layers, interval microspheres are arranged between the two substrates to control the thickness of a box and form a liquid crystal box, and the box is filled with liquid crystal materials; the photosensitive orientation layer is oriented through single holographic exposure, liquid crystal molecules are guided to form a two-dimensional polarization grating, the grating serves as a geometric phase device to work under a half-wave condition, and incident light can be separated into six polarization states including 0-degree / 90-degree linearly polarized light, 45-degree / 135-degree linearly polarized light and right-hand / left-hand circularly polarized light. By measuring the light intensity of six polarization states, the full Stokes parameter of incident light can be obtained at a time, the effective birefringence of the liquid crystal is regulated and controlled by means of voltage, the liquid crystal is adaptive to 450-1550 nm visible light, near-infrared and infrared bands, and the liquid crystal has the advantages of being simple in preparation, easy to integrate and accurate and efficient in measurement.

This invention belongs to the field of polarization measurement, and particularly relates to a space solar spectroscopic polarization telescope based on a built-in filter window assembly. It includes a telescope system, a relay system, and a spectrometer imaging system arranged sequentially along the optical path. The telescope system includes a primary mirror, a secondary mirror, and a built-in filter window assembly. The secondary mirror is located in the output optical path of the primary mirror, and the built-in filter window assembly is located in the output optical path of the secondary mirror. The built-in filter window assembly includes at least two filter glasses and a filter glass support. Each filter glass surface is coated with a filter film layer with different transmission bandwidths. This invention solves the weight, mechanical, and thermal control bottlenecks that restrict large-aperture space solar spectroscopic polarization telescopes by eliminating the front filter window and setting the built-in filter window assembly in the optical path, achieving a comprehensive improvement in optical performance, system reliability, and engineering feasibility.

The application relates to the field of optical communication technology and discloses a polarization control device and method based on a thin film lithium niobate, which comprises a first optical coupler, a first polarization beam splitting rotator, a polarization measurement component, a 2*2 Mach-Zehnder interferometer, a polarization control system and a lithium niobate optical waveguide arranged on the thin film lithium niobate. After arbitrary input polarized light enters the lithium niobate optical waveguide through the first optical coupler, the input polarized light is converted into TE polarized light through the first polarization beam splitting rotator; the polarization measurement component detects the energy of the TE polarized light and transmits the detection result to the polarization control system; the polarization control system calculates the polarization state of the input polarized light and the transmission matrix between the input polarized light and target output polarized light according to the detection result of the polarization measurement component, calculates a voltage control value according to the transmission matrix, and applies corresponding voltage to the 2*2 Mach-Zehnder interferometer to control the distribution of the TE polarized light in two arms of the 2*2 Mach-Zehnder interferometer and realize polarization control.

The invention relates to a multi-view-field aliasing infrared image polarization decoding method based on Stokes vector reconstruction, and relates to the technical field of space optics. The problems that an aliasing image recognition and reduction scheme generated by detector multiplexing imaging depends on scalar intensity and local contrast characteristics, distortion deviation causes decoding algorithm failure and poor accuracy and robustness are solved. The method comprises the following steps: acquiring multi-channel polarization measurement data; stokes vector reconstruction is carried out; constructing a polarization reference template; carrying out pixel-level classification based on a Stokes space; foreground target extraction and view field determination; and target reconstruction and output. According to the multi-view-field aliasing infrared image polarization decoding method based on Stokes vector reconstruction, polarization information is introduced to serve as an orthogonal physical dimension independent of intensity information, and a traditional detection mode which only depends on scalar intensity characteristics is expanded into a judgment mechanism based on vector information; the problem that a traditional intensity method is insufficient in recognition capability in an aliasing scene is effectively solved.

The application provides a polarization modulation method and system based on a Sagnac interferometer, belongs to the technical field of quantum communication, and has the following steps: presetting a polarization state of a polarization measurement module, adjusting a system frequency and a frequency of a modulation voltage signal, so that light intensity detected by the polarization measurement module is stable; the modulation voltage signal adopts a rectangular wave, and a duty cycle of the rectangular wave is adjusted to 50%; a delay is adjusted, so that a forward light pulse is at a high level; a high-level modulation voltage is adjusted until the light intensity detected by the polarization measurement module is maximum, and the modulation voltage at this time is recorded; different polarization states of the polarization measurement module are set, the system frequency, the duty cycle of the modulation voltage and the delay are kept unchanged, the high-level modulation voltage is adjusted until the light intensity detected by the polarization measurement module is maximum, and the modulation voltage corresponding to different theta is recorded respectively, the polarization modulation rate limitation of the Sagnac ring system is broken, and the polarization instability problem caused by the transmission delay of the electric signal is solved.

The invention discloses a channel type polarization measurement method and system based on a differential evolution algorithm, and the method comprises the steps: converting a starting deviation value and a detection deviation value at a wavelength point lambda into a least square problem when solving the starting deviation value and the detection deviation value, and solving the least square problem through the differential evolution algorithm; after system matrix vectors at all wavelength points are solved, the system matrix vectors are arranged in a system matrix PDE according to the wavelength sequence, the system matrix PDE containing all system errors in the detection spectrum range of the channel type polarization measurement system is obtained, and then a complete Mueller matrix of the sample is solved. According to the method, the channel type polarization measurement system matrix containing all system errors is solved by utilizing the differential evolution algorithm and the spectral information of the known sample, the complete Mueller matrix of the sample can be solved without building an additional measurement system and complex operation, and the measurement precision is relatively high.

A fluorescence polarization measurement device includes a light source unit, a polarization direction modulation element, a detector, and a controller. The polarization direction modulation element spatially modulates a polarization direction of the excitation light by a predetermined frequency, and emits, on a measurement target solution, the excitation light for which the polarization direction is spatially modulated by the predetermined frequency. The detector detects a spatial distribution of fluorescence intensity of the fluorescence having a polarization direction in a predetermined direction from among fluorescence emitted from the measurement target solution due to the excitation light. The controller extracts, from the detected spatial distribution of fluorescence intensity, a direct current component and a component having a frequency identical to the predetermined frequency, and calculates, based on the extracted component and the direct current component, a degree of polarization of the measurement target solution.

The application belongs to the field of polarization measurement, and particularly relates to a space solar spectrum magnetic field telescope based on multi-wave plate polarization modulation, which comprises a telescopic system, a relay system and a spectral imaging system; the telescopic system comprises a first 1 / 2 wave plate, a 1 / 4 wave plate and a second 1 / 2 wave plate; when neither the first 1 / 2 wave plate nor the second 1 / 2 wave plate fails, the second wave plate is kept static, the first wave plate and the third wave plate are rotated in the same direction according to a preset different-speed non-synchronous motion time sequence, and measurement of full Stokes components of solar polarization spectrum is realized; when any one of the first 1 / 2 wave plate or the second 1 / 2 wave plate fails, the 1 / 4 wave plate is started, and is rotated in the same direction with the other normal 1 / 2 wave plate according to a re-planned different-speed non-synchronous motion time sequence, so as to maintain the measurement of full Stokes components of solar polarization spectrum. The application can realize full Stokes measurement, and fills the gap of the space solar vector magnetic field detection capability in China.

This invention relates to a polarization decoding method for multi-field-of-view aliased infrared images based on Stokes vector reconstruction, belonging to the field of space optics technology. It addresses the problems of aliased image recognition and reconstruction schemes generated by detector multiplexing imaging relying on scalar intensity and local contrast features, distortion bias leading to decoding algorithm failure, and poor accuracy and robustness. The method includes the following steps: acquisition of multi-channel polarization measurement data; Stokes vector reconstruction; construction of a polarization reference template; pixel-level classification based on Stokes space; foreground target extraction and field-of-view determination; target reconstruction and output. This invention's polarization decoding method for multi-field-of-view aliased infrared images based on Stokes vector reconstruction introduces polarization information as an orthogonal physical dimension independent of intensity information, extending the traditional detection method that relies solely on scalar intensity features to a discrimination mechanism based on vector information, effectively solving the problem of insufficient recognition capability of traditional intensity methods in aliased scenes.

The invention provides a composite diversity type high-interference-efficiency vibration measurement method and device, and belongs to the technical field of optical measurement. The device comprises a light source, a measuring light path module, a reference light path module and a signal interference detection module. Laser emitted by the light source is divided into P polarization measurement light and S polarization reference light; the measuring light path module carries out frequency modulation through an acousto-optic modulator, linearly polarized light is changed into circularly polarized light through a lambda / 4 wave plate, the circularly polarized light irradiates a measured target, and scattered light is separated into two paths of measurement signals with orthogonal polarization states through a spatial light circulator and a polarization splitting prism. The reference light path module divides the S polarization reference light into two beams; and the signal interference detection module enables the two paths of measurement signals to interfere with the two beams of reference light respectively, and differential balance detection is carried out by adopting an array type photoelectric detector. Through combination of polarization diversity and detection diversity, interference signal attenuation and fluctuation of an optical non-cooperative target caused by a depolarization effect and dynamic speckles are effectively suppressed.

The invention relates to a multi-channel optical system based on pupil division for spectrometry, polarimetry and spectro-polarimetry. In particular, the system comprises an entrance pupil for receiving an optical beam, the entrance pupil aperture allowing a multiple number of beam channels to pass. The optical system also comprises first optics for imaging the corresponding number of beam channels to an intermediate image, and a field stop spatially limiting the corresponding number of beam channels in the intermediate image. Further, the optical system includes second optics for imaging the spatially limited intermediate image to a pupil image, and a pupil separation module angularly separating the corresponding number of beam channels propagating from the pupil image. In addition, a multiple number of filters for filtering the corresponding number of beam channels is included.

A method and a device used in an optical wireless communication (OWC) system are provided. A transmission terminal generates multiple inhomogeneous polarization patterns on the basis of polarization superposition. In addition, the transmission terminal maps a modulation state and an information bit for each of the multiple inhomogeneous polarization patterns, modulates a signal on the basis of one inhomogeneous polarization pattern among the multiple inhomogeneous polarization patterns, and transmits the modulated signal A reception terminal receives a modulated signal, and determines one inhomogeneous polarization pattern among the multiple inhomogeneous polarization patterns on the basis of polarization measurement for the modulated signal. The reception terminal determines an information bit mapped to the one inhomogeneous polarization pattern, and demodulates the modulated signal on the basis of a modulation state mapped to the information bit.