Method for preparing high-reliability optical fiber coupler

Abstract

The invention discloses a preparation method of a high-reliability optical fiber coupler. The method comprises the following steps: (1) the optical fiber coupler is prepared by a parallel sintering dense melting tapering process, after the optical fiber coupler is sintered, the longitudinal tensile strength is detected by tensile force, and the longitudinal tensile strength is required to be more than 1N; (2) the two ends of the sintered optical fiber coupler are fixed in a U-shape quartz groove by thermo-curing glue, the inside at the two ends of the quartz groove is filled with UV glue, and the span length of the intermediate optical fiber is shortened; (3) the optical fiber coupler is sheathed in a quartz circular tube, and the two ends of the quartz circular tube are fixed by the thermo-curing glue; (4) high-temperature treatment is carried out on the optical fiber coupler, firstly the high-temperature treatment is carried out at the temperatures of 83-87 DEG C for 2-3 hour storage; and then carried out at the temperatures of 108-112 DEG C for 1-2 hour storage; and (5) the optical fiber coupler is sheathed on a stainless steel tube after the quartz circular tube is coated with silicon rubber, and the two ends of the stainless steel tube are sealed.

Description

technical field [0001] The invention relates to a preparation method of an optical fiber coupler. The optical fiber coupler plays the role of splitting and combining optical signals, and is widely used in optical fiber sensing fields such as optical fiber gyroscopes, optical fiber hydrophones, and optical fiber current sensors. Background technique [0002] Optical fiber couplers play the role of splitting and combining optical signals, and are widely used in optical fiber sensing fields such as optical fiber communication, optical fiber gyroscopes, optical fiber hydrophones, and optical fiber current sensors. [0003] The preparation of the fiber coupler by the fusion tapered method is to make two optical fibers with the coating removed parallel or twisted and close together, use flame heating to melt the optical fiber, and stretch it to both sides at a certain speed at the same time, forming in the local heating area of ​​the optical fiber. With the tapered shape, the evan...

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