Tunable multi-wavelength fiber laser based on high-birefringence micro-nano fiber

Abstract

The invention discloses a tunable multi-wavelength fiber laser based on a high-birefringence micro-nano fiber. The fiber laser comprises a pump laser, a wavelength division multiplexer, a gain fiber,a polarization controller, an optical fiber filter and an optical coupler. The components form a fiber laser resonant cavity through an optical fiber coupling mode. The pump laser is connected with the gain fiber through the wavelength division multiplexer; and the output end of the gain fiber is connected with the polarization controller, the optical fiber filter and the optical coupler in sequence. By adjusting the polarization controller, incident light has different polarization states, and non-uniformity of the polarization states in the laser resonant cavity is enhanced after passing through the optical fiber filter, so that polarization hole burning is generated in a gain medium, in-cavity mode competition is suppressed, and furthermore, polarization control tunable multi-wavelengthlaser output can be obtained. The tunable multi-wavelength fiber laser adopts the high-birefringence micro-nano fiber having all fiber, small size, simple structure, low cost and low loss as a mode selection unit, and realizes low-loss, stable and narrowband laser output.

Description

technical field [0001] The invention relates to a tunable multi-wavelength fiber laser based on a high-birefringence micro-nano fiber, and belongs to the technical field of fiber lasers. Background technique [0002] Recently, fiber lasers have become a research hotspot in the field of solid-state lasers because of their all-fiber, high efficiency, and flexible wavelength characteristics. In particular, wavelength division multiplexing (WDM) technology has become the key to meet the high-capacity communication needs of optical fiber communication, and tunable multi-wavelength fiber lasers, as the light source of optical fiber WDM communication systems, have very important research and application value. [0003] Early multi-wavelength tunable lasers were mainly achieved by adding wavelength tunable components such as F-P cavity, dielectric thin film filter and acousto-optic filter to the laser resonator. However, these free-space tuning devices are generally non-fiber struc...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of high production cost, poor stability, low compactness and small tuning range of the prior art, the present invention proposes a tunable multi-wavelength fiber laser based on high birefringence micro-nano fiber

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