48 results about "Orbital angular momentum multiplexing" patented technology

The invention discloses a partial reception method for an orbital angular momentum mode demultiplexing. A partial reception bore is 1 / n of the whole bore circumference needed by complete reception, a plurality of orbital angular momentum multiplexing wave beams comprising a group of orbital angular momentum topological charges li meeting a certain rule are selected, the topological charges li meet li=l+nm, the l refers to an optional orbital angular momentum topological charge, the m is an integer, the n is an integer larger than or equal to 2, the orbital angular momentum multiplexing wave beams are mutually orthogonal, the 1 / n partial reception bore is used for receiving at a receiving end, and low-crosstalk orbital angular momentum mode demultiplexing can be realized.

The invention relates to a multimodal orbital angular momentum multiplexing system and method. The system comprises a transmitting device and a receiving device which are in mutual communication connection. The transmitting device comprises a bit level processing module, a constellation mapping module, an orbital angular momentum modulation module, a digital domain orbital angular momentum multimodal multiplexing module, a DAC module, an upper conversion module and a ring array transmitting antenna. The receiving device comprises a ring array receiving antenna, a down conversion module, an ADC module, a digital domain orbital angular momentum demodulation and demultiplexing module and a detection decoding module. According to the system and the method, a vortex electromagnetic wave multimodal OAM (Orbital Angular Momentum) multiplexing communication technology of which physical feature is clearly different from that of a traditional plane wave is realized; the spectral efficiency and the transmission rate are multiplied; and the improvement space and potential of the modal multiplexing quantity is further expanded. The system and the method can be applied to the multimodal OAM multiplexing communication system in a microwave or millimeter wave band.

The invention relates to the technical field of optoelectronic components and devices, and proposes a VCSEL-based orbital angular momentum multiplexing device, including a vertical cavity surface emitting laser, a silicon nitride phase layer, a metal shielding layer, a P-face electrode and an N-face electrode; On the cavity surface emitting laser, a cylinder, a first outer ring and a second outer ring structure are sequentially etched from the inside to the outside with the center point as the center; the silicon nitride phase layer is arranged on the upper surface of the cylindrical structure, accounting for half of the upper surface of the cylinder One area; the metal shielding layer is arranged on the upper surface of the first outer ring and the upper surface of the second outer ring and etched into a metal grating structure; the P-face electrode and the N-face electrode are arranged on the vertical cavity surface emitting laser. The present invention also proposes a preparation method of the multiplexing device, and the multiplexing device can realize coaxial independent modulation of high-purity 1st, 2nd, and 3rd-order OAM beams, and realize coaxial integration of OAM beams, and the multiplexing device The production cost is low, and the preparation process is simple.