Light communication light receiver aerial in free-space
A light receiving antenna and free space technology, applied in the coupling of optical waveguide, etc., can solve the problems of ATP system complexity, failure to receive focused optical signals, and high price, and achieve the effect of simple optical path design
Inactive Publication Date: 2009-06-03
SHANGHAI UNIV
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Problems solved by technology
Both light-receiving antennas use a lens system, which improves accuracy but is expensive
Non-fiber optic optical receiving antennas mainly use enlarged photodetector area or ATP (acquisition, aiming, tracking) system, but the size of the photodetector is inversely proportional to the transmission rate, and the ATP system is complex, and it is impossible to correct the focus in real time during high-speed motion The offset of the optical signal; the fiber-optic optical receiving antenna mainly uses ordinary single-mode optical fiber or multi-mode optical fiber, which cannot normally receive the focused optical signal with a large offset that occurs on the focal plane
Method used
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[0015] A preferred embodiment involved in the present invention is described below with reference to the accompanying drawings:
[0016] see figure 1 , the free space optical communication light receiving antenna includes a condensing lens 1, and a special light cone 2 is arranged coaxially behind the condensing lens 1, wherein the end face 3 of the special light cone 2 is located near the focal plane of the condensing lens 1, and the The optical axis is completely coincident with the optical axis of the special light cone 2; the cross-sectional area of the end face 4 is smaller than that of the end face 3; the end face 4 is equipped with a certain type of optical fiber connector.
[0017] The special light cone 2 is made of pure quartz material, and its outer surface is coated with a layer of low refractive index material 5, and the refractive index of the coating layer is lower than that of the special light cone 2, so that light can pass through the special light cone. 2...
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The present invention describes a light communication light receiver aerial in free-space including a convergent lens provided with a special light-cone in coaxial line with back side of the convergent lens to realize integration of receiving and transmitting focused light signal. One end Sectional area of special light-cone is smaller than that of the other end, wherein the end with bigger sectional area aligning the convergent lens while the other end with smaller sectional area connects with optical receiver after assembled optical fiber connector. Compared with traditional light communication light receiver aerial in free-space, the special light-cone adopted in the invention makes design of light path of light communication light receiver aerial in free-space simple and flexible, and light signal can be easily received by optical receiver which is suitable for light signal receiving in free-space light communication under static or motion state.
Description
Technical field: [0001] The invention relates to an optical receiving antenna for free space optical communication, which can integrate the reception and transmission of focused optical signals, and can be used for, but not limited to, optical signal reception in free space optical communication. Background technique: [0002] Free Space Optical Communication (FSO for short) is an emerging wireless communication method. It has the advantages of large communication capacity, high transmission rate, frequency bandwidth, strong security and confidentiality, anti-electromagnetic interference, simple networking, low cost, and no need to apply for frequency bands. It can be widely used in emergency temporary communication, building communication, last-mile connection access, telecommunication network, data backup, etc. [0003] In FSO, beam alignment is a very critical issue for normal communication, but beam deflection caused by various external or internal factors makes the foc...
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Login to View More IPC IPC(8): G02B6/30G02B6/26
Inventor 陈振宜庞拂飞王廷云付兴虎俞起帆郭强
Owner SHANGHAI UNIV