A high power fiber optic circulator based on curved fiber end cap

Abstract

The invention provides a high-power optical fiber circulator based on cambered optical fiber end caps. The circulator at least comprises an optical fiber (11) and an end cap (12), an optical fiber (13) and an end cap (14), an optical fiber (15) and an end cap (16), a circulator core and a substrate, wherein the optical fiber (11) is connected with the end cap (12); the optical fiber (13) is connected with the end cap (14); the optical fiber (15) is connected with the end cap (16); and the circulator core is mounted on the substrate and can deviate or displace beams entering the circulator core. According to the circulator, the expanding and collimation of the beams at the cambered end caps are achieved through a principle of waveguide beam expanding and cambered auto-collimation output; the cambered end caps collect and couple signal light to enter tail fiber cores; the integrated cambered optical fiber end caps effectively improve the coupling efficiency of the beams in the circulator; and the power handling ability of the optical fiber circulator is improved.

Description

technical field [0001] The invention relates to an optical passive device, especially a multi-port high-power optical fiber circulator. Background technique [0002] The optical circulator is an optical device with multi-port input and output non-reciprocity to control the propagation direction of the beam. The optical signal can only be transmitted along a specific port sequence in the device. When the transmission sequence of the optical signal is changed, its loss is great. , so the role of signal isolation can be achieved. [0003] Due to the sequential transmission characteristics of the optical circulator, it becomes an important device in two-way communication and laser transmission. Currently, optical circulators are widely used in laser systems, coherent detection and hydrophones. With the improvement of the power of fiber lasers, applications such as optical circulators with pigtail input and output combined with coherent detection of high-power fiber lasers have...

AI Technical Summary

Problems solved by technology

[0004] Prior art "An optical circulator based on optical fiber and lens array CN103955026B", "An optical circulator CN 103995319B", "Compact low crosstalk, three-port optical circulator EP0860731B1", "Bi-directional optical circulator and applications there of US6538815 ", "method and system for providing a simplified in-line optical circulator US 6782145", mainly based on the spatial coupling method of the lens, this coupling method is to add a lens to the end face of the optical fiber, so the structure is more complicated

Generally, a λ / 4 fiber self-focusing lens is used. The size and wavelength of the lens must match the fiber. If there is any deviation, the coupling efficiency will be low, and the quality of the spot will be poor, which will seriously cause loss of optical signals.

Therefore, this traditional coupling technology is difficult to install and adjust, and there is a bottleneck in the coupling efficiency. In particular, the heat generated by the coupling loss stimulates the damage of the fiber end face, which limits the power capacity of the device.

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