Brillouin few-mode fiber laser capable of simultaneously outputting fundamental mode and high-order mode

Abstract

The invention discloses a Brillouin few-mode fiber laser capable of simultaneously outputting a fundamental mode and a high-order mode, which comprises a narrow-linewidth fiber laser, the output end of the narrow-linewidth fiber laser is connected with a single-mode fiber circulator, one end of the single-mode fiber circulator is connected with a single-mode fiber optical amplifier, and the other end of the single-mode fiber circulator is connected with a single-mode fiber coupler; the single-mode fiber optical amplifier is connected with the first mode selection coupler, and the first mode selection coupler is connected with the few-mode fiber; the single-mode optical fiber coupler is connected with the single-mode optical fiber isolator, the single-mode optical fiber isolator is connected with the single-mode optical fiber polarization controller, the single-mode optical fiber polarization controller is connected with the second mode selection coupler, the second mode selection coupler is connected with the few-mode optical fiber coupler, and one end of the single-mode optical fiber coupler outputs fundamental mode laser; one end of the few-mode fiber coupler outputs high-order mode laser. The output light of the laser can be directly subjected to information modulation in the mode division multiplexing technology, and the laser has the advantages of being convenient to use, easy to fuse with a subsequent system and the like.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a Brillouin few-mode fiber laser that simultaneously outputs a fundamental mode and a high-order mode. Background technique [0002] With the rapid development of metaverse, big data, cloud computing and other technologies, people have an increasing demand for communication capacity in communication systems. limit". In order to further improve the transmission capacity of optical fiber communication systems, mode division multiplexing technology has become a potential solution. The few-mode fiber that can realize the mode division multiplexing technology can transmit several modes at the same time, and each mode can be used for the transmission of communication information, which greatly improves the transmission capacity of the communication system. As the forefront of the mode division multiplexing fiber communication system, fiber lasers capable of generating various modes have a...

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Problems solved by technology

The research group of Li Juhao of Peking University used a mode multiplexer composed of a mode selection coupler to realize a three-mode LP 01 、LP 11 and LP 21 The individually switched output and its mixed-mode output [Li Xiaofeng, Li Zhe, Wu Wenmao, Li Juhao, Ren Fang, Transverse mode switchable few-mode ring fiber laser, Acta Optics Sinica, 2020, 40(14): 1406002 1-6.], Although the mixed output of the three modes is realized in this paper, each mode in the mixed mode still needs to be separated in the subsequent application, and it cannot be directly used as the front-end light source of the mode division multiplexing system

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