Single-mode fiber coupling structure for satellite laser communication terminal

Abstract

The invention provides a single mode fiber coupling structure of a satellite laser communication terminal and belongs to the technical field of single mode fiber coupling structures. The single mode fiber coupling structure is composed of seven single mode fibers and a rubber protection casing, wherein one single mode fiber is arranged in the middle, the six single mode fibers are arranged on the periphery of the single mode fiber in the middle to form a structure with a round section, the periphery of the round structure formed by the seven single mode fibers is wrapped with the rubber protection casing, and a fiber wrapping layer is arranged on the outer surface of each single mode fiber. The linear distance between the circle centers of every two adjacent single mode fibers is 13 micrometers, the depth of parallelism of the six peripheral single mode fibers and the central single mode fiber is phi 0.05 mm, and the thickness of the fiber wrapping layer is larger than or equal to 3 micrometers. By means of the single mode fiber coupling structure, the tolerance of the receiving end faces of the fibers on random angular deviation is improved; the influences of alignment deviation caused by various kinds of vibration on coupling efficiency are reduced, the stability of a communication system is improved, the losing rate of signals is reduced, and thus light information transmission can be better and more stably carried out.

Description

technical field [0001] The invention relates to a single-mode optical fiber coupling structure of a satellite laser communication terminal, belonging to the technical field of single-mode optical fiber coupling structures. Background technique [0002] Efficiently coupling space lasers into single-mode optical fibers is one of the key technologies for satellite optical communication systems based on differential detection systems. Considering factors such as the vibration between platforms during the high-speed motion of the satellite, the accuracy of the tracking system, and the mechanical noise of the turntable, it will cause angular jitter at the receiving end, which will affect the fiber coupling. In the satellite optical communication system, the single-mode fiber is generally about 10 μm in diameter, and the spot size converged on the single-mode fiber through the receiving optical system is generally 20 μm. Since the diameters of the two are on the same order of magn...

AI Technical Summary

Problems solved by technology

Since the diameters of the two are on the same order of magnitude, a small angular deviation will lead to a large deviation between the spot and the receiving single-mode fiber. This structure has a small tolerance to the angular deviation, and a large angular deviation will Seriously affect subsequent light detection and signal processing

When working on a satellite platform, random angular jitter is more serious. This structure using a single single-mode optical fiber for reception makes the coupling efficiency very unstable and cannot meet the requirements for stable reception and processing of optical signals.

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