High-birefringence saturable absorption ring self-excitation multi-wavelength high-OSNR Brillouin fiber laser

Abstract

The invention relates to a high-birefringence saturable absorption ring self-excitation multi-wavelength high-OSNR Brillouin fiber laser. The fiber laser comprises a bidirectional erbium-doped fiber amplifier EDFA, a single-mode fiber SMF, a high-birefringence saturable absorption ring, an optical circulator, a first optical coupler and a spectrum analyzer. In the invention, a linear structure with a high-birefringence saturable absorption ring is utilized; threshold power required by erbium-doped fiber pumping is effectively reduced; and meanwhile, an occurrence probability of a space hole burning effect (SHB effect) is increased, the SHB effect can effectively inhibit occurrence of modal competition, stable multi-wavelength oscillation, a high birefringence effect in a high birefringencesaturable absorption ring and a saturable absorption narrow-band filtering characteristic are promoted, and the number of self-shock wave lengths and high OSNR of a multi-wavelength laser are guaranteed respectively.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a high birefringence saturable absorption ring self-excited multi-wavelength high OSNR Brillouin fiber laser. Background technique [0002] The wide application of Dense Wavelength Division Multiplexing (DWDM) in optical communication networks has made multi-wavelength fiber lasers more and more people's attention. Due to its simple structure, narrow linewidth, stable multi-wavelength output capability, low cost and wide tunable range, Brillouin fiber lasers have attracted more and more international attention. The optical signal-to-noise ratio (OSNR) determines the quality of a laser signal. Especially in WDM, OSNR is a crucial reference index. The higher the OSNR, the fewer transmission errors. Conversely, a lower OSNR may increase maintenance costs , reducing service quality and service life. [0003] Searching in the existing literature found that domestic and forei...

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Problems solved by technology

However, there are still deficiencies: although a large number of self-excited multi-wavelength Brillouin outputs have been achieved, while ensuring the number of output lasers, the optical signal-to-noise ratio of the output laser cannot be guaranteed. The optical signal-to-noise ratio is an important consideration for the output laser , determines the quality of the output laser

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