Nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser

Abstract

The invention discloses a nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser and belongs to wavelength tunable type femtosecond pulse lasers. The nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser comprises a pumping source and an optical fiber ring cavity, wherein the optical fiber ring cavity is formed by connecting a wavelength division multiplexer, Er-doped fibers, an optical fiber isolator, an optical fiber polarizer, an optical fiber coupler and optical fibers used in a polarization controller, the pumping source is connected with the pumping port of the wavelength division multiplexer, a public port of the wavelength division multiplexer is connected to the 80% output port of the optical fiber coupler after passing through the Er-doped fibers, the optical fiber isolator and the optical fiber polarizer in sequence, and the input end of the optical fiber coupler is connected to a signal port of the wavelength division multiplexer through the polarization controller; the optical fiber isolator is connected with the optical fiber polarizer through dispersion compensation fibers, and the other devices are connected through single-mode optical fibers. The nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser has the advantages that the structure is simple and reliable, maintenance is convenient, external signal modulation is not needed, self-starting mode locking can be achieved, output pulses are narrow, the working performance is excellent, cost is low, and operation is easy.

Description

technical field [0001] The invention relates to a wavelength-tunable femtosecond pulse laser, in particular to a nonlinear polarization rotation mode-locked wavelength-tunable L-band femtosecond erbium-doped fiber laser. Background technique [0002] The L-band refers to the laser band with a wavelength from 1565 nm to 1625 nm. Because glass optical fibers have very low loss in this band, they are widely used in optical fiber communication systems. Especially ultrafast femtosecond lasers, due to their extremely high time resolution, have a wide range of application requirements in large-capacity and high-speed optical information transmission, biomedical detection, and scientific research applications. [0003] In different application backgrounds, there are different requirements for the wavelength position of ultrafast lasers. Therefore, realizing the wavelength tunability of laser light sources in a wide range can not only expand its application fields and directions, bu...

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Problems solved by technology

[0005] However, the above technical methods have shortcomings such as complex overall structure, difficult technical implementation, and inconvenient maintenance in the later stage, which restricts their further development and application.

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