Dual-mode dual-wavelength switchable pulse fiber laser

Abstract

The invention discloses a dual-mode dual-wavelength switchable pulse fiber laser. The dual-mode dual-wavelength switchable pulse fiber laser adopts a dislocation method and a dual-mode fiber grating as a transverse mode converter and a wavelength selector at the same time. The mode locking mechanism of the laser is based on the saturation absorption of a semiconductor saturable absorber mirror, has the characteristic of polarization irrelevance, and avoids the crosstalk of the mode conversion relates with the polarization and wavelength selection. The semiconductor saturable absorption mirrorand the dual-mode fiber grating are connected to a laser cavity through a four-port circulator, and the light from the port-1 of the four-port circulator is reflected by the semiconductor saturable absorber mirror at the port-2, and then enters the port-3 for mode conversion and wavelength selection through dislocation points and the dual-mode fiber grating, and then passes through the port-4 to return to the cavity 4. The lasers work on wavelengths of a fundamental mode and a second-order high-order mode respectively, and a second-order high-order mode light beam and a fundamental mode lightbeam are outputted at the output end of the dual-mode fiber grating. The laser is a simple and low-cost wavelength division / mode division multiplexing light source, and the output state of a light beam is adjusted according to conditions.

Description

technical field [0001] The invention relates to the technical field of optical fiber lasers, in particular to a dual-mode, dual-wavelength switchable pulsed optical fiber laser. Background technique [0002] In recent years, due to the sharp increase in data demand driven by the Internet, the transmission capacity of single-mode optical fiber networks is approaching the Shannon limit. In order to further increase the capacity of single-mode optical fiber transmission systems and solve the bottleneck problem of increasingly tight bandwidth resources, multiplexing technology based on multi-mode optical fiber or multi-mode optical fiber has become a promising solution. Therefore, it is of great significance to study fiber lasers emitting higher-order modes. [0003] In addition to their use in mode-division multiplexing transmission, FMFs also have important applications in the mode manipulation of FMF-based devices such as fiber tapers, couplers, and gratings. Taking the fib...

AI Technical Summary

Problems solved by technology

However, since the method of mode-locking pulse generation is usually polarization-dependent, it is easy to interact with high-order mode selection, and it is challenging to achieve mode selection and mode-locking at the same time.

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