Abstract: The present invention discloses a terahertz metamaterial. The terahertz metamaterial includes a substrate and an electromagnetic loss resonant ring structure disposed on the substrate, where an electromagnetic modulation function is realized on a terahertz band by adjusting different structural sizes and square resistance of the electromagnetic loss resonant ring structure. In the present invention, the electromagnetic loss resonant ring structure is disposed on the substrate, and the electromagnetic modulation function is realized on the terahertz band by adjusting the different structural sizes and square resistance of the electromagnetic loss resonant ring structure, thereby simplifying processing steps of a terahertz device, reducing a processing cost, and enabling a terahertz technology to be widely used in the field of electromagnetic communications.

Abstract: The present invention discloses a visible light encryption method, a decryption method, a communication device and a communication system. The method includes: receiving a visible light signal from a transmit end, where the visible light signal is encrypted at the transmit end by using a key; and obtaining the key, and decrypting the visible light signal according to the key, where the obtaining the key includes: obtaining a key corresponding to a state of a state machine of a receive end; or, obtaining indication information according to the visible light signal and obtaining the key according to the indication information, where the indication information is used to obtain the key. The present invention solves a problem of decryption failure in visible light encryption and decryption, and improves accuracy of decryption.

Abstract: The present application relates to an optical signal receiving apparatus, including a housing for accommodating a body inside the housing, where the body is provided with an optical receiver for receiving an external optical signal, and an optical-to-electrical conversion device is arranged at a central position of the optical receiver. The optical signal receiving apparatus is further provided with a lamp cup for reflecting the external optical signal to the optical-to-electrical conversion device, a light ring for indicating a light incident region, a pry-proof circuit arranged on the body, a power control circuit, and a keying circuit. The optical signal receiving apparatus of the present application can improve user experience.

Abstract: A metamaterial comprises a plurality of electrically controllable metamaterial units each comprising a varactor diode; the predetermined angle is an angle at which an electromagnetic wave is reflected from a surface of the metamaterial; there is an association relationship between the predetermined angle and the first phase difference; the method comprises: determining a first phase difference between electromagnetic waves reflected by two adjacent electrically controllable metamaterial units in a metamaterial based on a predetermined angle; determining a target capacitance of the varactor diode in each electrically controllable metamaterial unit based on the first phase difference; and adjusting a capacitance of the varactor diode in each electrically controllable metamaterial unit to the target capacitance.

Abstract: The present invention discloses a metamaterial, and a method and an apparatus for adjusting a frequency of the metamaterial. The metamaterial includes a substrate material, and an electrically controllable microstructure unit array disposed on the substrate material and including a plurality of electrically controllable microstructure units. Each electrically controllable microstructure unit includes an external metal structure, an internal metal structure, and a varactor diode. The internal metal structure and the external metal structure define a ring-shaped channel. The varactor diode is disposed in the ring-shaped channel of each electrically controllable microstructure unit, and is configured for adjusting an operating frequency of each electrically controllable microstructure unit according to a voltage applied across the varactor diode.

Abstract: The present disclosure relates to the aerospace application field, and provides a method for flying a large balloon. In the method, a constraint apparatus is disposed on a balloon capsule to replace a roller, and the constraint apparatus is released progressively in a release process of the balloon capsule, so that the balloon capsule is released progressively and slowly before rising above a pod. This greatly reduces the impact in a flying process, makes it easier to control a flying status of the balloon capsule, and also makes related operations of onsite staffs simpler and controllable.

Abstract: The present application relates to a wireless signal decoding method, which is used to decode an electric signal converted from a wireless signal, where the decoding method includes the following steps: recording a duration of each level of the electric signal; calculating an average value of m maximum durations and an average value of n minimum durations, where m and n are positive integers and are determined by referring to a distribution percentage value of first binary bit values and a distribution percentage value of second binary bit values in data respectively; calculating a decision duration according to the first average value and the second average value; comparing the duration of each level with the decision duration, and according to a comparison result, determining a binary bit value represented by the level; and integrating all binary bit values to restore the data represented by the electric signal.

Abstract: A method of pumping an optical resonator includes directing light generated by a pumping light at the optical resonator, exciting a propagating surface state of the optical resonator at an interface of the optical resonator, and changing a propagating frequency of the light proximate the interface, where the changed frequency corresponds to a propagation frequency of the surface state. The optical resonator includes a photonic crystal and a material, where the interface is formed between the photonic crystal and the material.

Abstract: This disclosure provides a cloud-based device and an operating method thereof. The device includes an analysis apparatus, where the analysis apparatus includes: a first HMM analyzer, configured to respectively receive a scenario input signal, an audience expression input signal, and an audience voice input signal, use them as observable sequences of a first HMM, and deduce a hidden state change sequence of the first HMM; an emotional state HMM analyzer, configured to use the hidden state change sequence of the first HMM as an observable sequence of an emotional state HMM, and deduce a hidden state change sequence of the emotional state HMM; and a voice signal processing unit; and a decision apparatus, configured to select humorous behavior based on the hidden state change sequence of the emotional state HMM, and consolidate a humorous behavior instruction and the standard instruction to obtain a final output instruction.

Abstract: The present invention relates to an antenna, which can improve a front-to-rear ratio and cross-polarization isolation without changing a structure of a reflection panel. The antenna includes an antenna element and a reflection panel. The antenna element is disposed on the reflection panel. The antenna further includes a wave-absorbing material layer. The wave-absorbing material layer is disposed on one side of an outer surface, back to the antenna element, of the reflection panel.

Abstract: The present invention relates to an optical noise removal circuit, an optical receiver, and an optical chip. The optical noise removal circuit includes: a noise filter unit, where an input end of the noise filter unit receives an electrical signal coming from an photoelectric conversion unit, and the noise filter unit is configured to filter out a noise electrical signal, in the electrical signal, that is generated due to ambient light, and output a target pulse signal at an output end; and a comparison unit, where a first input end of the comparison unit is coupled to the output end of the noise filter unit to receive the target pulse signal, and the comparison unit is configured to output a digital signal based on comparison between the target pulse signal and a reference voltage. By implementing the present invention, quality of a received optical signal can be effectively improved.

Abstract: The present invention provides an identity authentication system, apparatus and method and an identity authentication request apparatus. The system includes: an identity authentication request apparatus, configured to send a verification code issuing request to an identity authentication apparatus; the identity authentication apparatus, configured to respond to the verification code issuing request sent by the identity authentication request apparatus, generate an ID and a corresponding verification code according to the verification code issuing request, bind the generated ID and the verification code, store the generated ID, the verification code, and a binding record, and feed back feedback information that carries the verification code to the identity authentication request apparatus. The present invention provides a practical and effective identity authentication mechanism.

Abstract: This application discloses a method for an optical drive chip to control a light-emitting device and an optical drive chip thereof. A receiving unit of the optical drive chip obtains to-be-sent data, and transmits the to-be-sent data to an execution unit of the optical drive chip; and the execution unit converts the to-be-sent data into a drive signal according to a control parameter set, where the drive signal is used to control a light-emitting device to emit visible light. Because the optical drive chip converts the to-be-sent data into the drive signal according to the control parameter set so as to control the light-emitting device, rather than obtaining a single control parameter one by one to control the light-emitting device, no delay problem occurs in a process of controlling the light-emitting device by the optical drive chip. In addition, the to-be-sent data is encoded, which ensures data transmission reliability.

Abstract: The present application relates to an optical communication transmitting apparatus and receiving apparatus. The optical communication transmitting apparatus includes: an encoder, configured to encode and shunt an input signal, to generate multiple synchronous encoded signals; a driver, configured to amplify the multiple encoded signals, to generate multiple drive signals; and multiple light sources, configured to generate multiple synchronous optical signals when driven by the multiple drive signals. The optical communication transmitting apparatus and receiving apparatus provided in the present application make full use of advantages of visible light communication, achieving a rapid communication speed and high security.

Abstract: The present application relates to error retransmission mechanism-included methods, apparatuses, and systems for transmitting and receiving a visible light signal. The transmitting method includes the following steps: during transmission of a visible light signal, when an emitter executes signal transmission on an error sensitive level each time, reading an execution duration of the emitter; comparing the execution duration with a signal duration range; when the execution duration does not fall within the signal duration range, performing signal retransmission; and when the execution duration falls within the signal duration range, continuing signal transmission.

Abstract: The disclosure relates to an overlapped multiplexing modulation method, apparatus, and system.

Abstract: A method includes: receiving a to-be-decoded symbol sequence, where the to-be-decoded symbol sequence includes N symbols; dividing the received to-be-decoded symbol sequence into a first symbol sequence and a second symbol sequence; calculating first distances between the first symbol sequence and each of corresponding 2K ideal superimposed symbol sequences, and obtaining paths corresponding to relatively small distances based on the first distances; sequentially performing sequence detection on each symbol in the second symbol sequence based on the paths corresponding to the 2k-1 relatively small distances, calculating second distances between each symbol in the second symbol sequence and each ideal symbol sequence, and after the sequence detection is performed on a last symbol, obtaining an ideal symbol sequence corresponding to a minimum distance based on the second distances; and using the ideal symbol sequence corresponding to the minimum distance as an output symbol sequence.

Abstract: The present invention discloses a band-pass filtering structure and an antenna housing. The band-pass filtering structure includes a functional layer structure, where the functional layer structure includes two or more first dielectric layers and a second dielectric layer that is disposed between two first dielectric layers, a plurality of first conductive geometric structures displayed in a periodical arrangement are disposed on the first dielectric layer, a plurality of second conductive geometric structures displayed in a periodical arrangement are disposed on the second dielectric layer, the first conductive geometric structure includes two crossly-disposed conductive strips, and the second conductive geometric structure is a closed conductive geometric structure. The present invention resolves a technical problem that filtering performance of an existing band-pass filter is poor due to unreasonable structural design.

Abstract: The present disclosure discloses methods and devices for an optical signal encoding and decoding. The optical signal encoding method includes: reading N-ary data bit by bit, and encoding the data into electric signal units: encoding each different digit in the N-ary data into a different electric signal unit, where high level duration and low level duration in the electric signal unit are Ti1, Ti2, . . . , and Tij respectively, i, j, and N are natural numbers, and the different electric signal units are separated by delimiters; and combining the electric signal units corresponding to the N-ary data into a drive signal, where the drive signal is used for being output in a light form. Instable flashing of emitted light of a terminal device is overcome effectively, and information transmission reliability is further improved.

Abstract: The present application provides a photon-based CA authentication method, including: receiving, by a photon-based CA authentication terminal, an optical signal from a photon terminal, where the optical signal includes a user ID; verifying the user ID included in the optical signal; and providing, in response to successful user ID verification, a user certificate to a client to perform CA certificate authentication.