Stable tunable multi-wavelength highly Er-doped fiber laser

Abstract

The invention discloses a stable tunable multi-wavelength highly Er-doped fiber laser which can output stable multi-wavelength with flat power at the room temperature. The multi-wavelength laser structurally comprises a pumped source 1, a wavelength division multiplexer WDM2, a highly Er-doped fiber HEDF 3, a polarization isolator PD-ISO4, a polarization maintaining fiber PMF5, a polarization controller PC6, a 3dB optical coupler 7, a first single-mode fiber SMF8, a second single-mode fiber SMF9 and an optical coupler C10 in the splitting ratio of 90:10. The wavelength division multiplexer couples 980nm of pumped laser into the Er-doped fiber, the laser enters a comb filter composed of the polarization isolator, the polarization maintaining fiber and the polarization controller, the optical coupler returns 90% of multi-wavelength laser generated in a loop to the loop and outputs 10% of the same, the laser enters a nonlinear fiber annular mirror via the 3dB optical coupler, and light after interference enters the first single-mode fiber, and then returns to the wavelength division multiplexer to form an annular cavity.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a stable and tunable multi-wavelength highly doped erbium-doped fiber laser. Background technique [0002] With the rapid development of large-capacity optical fiber communication networks, the requirements for the number of channels in wavelength division multiplexing technology and dense wavelength division multiplexing technology are also increasing. In the traditional method, multiple single-wavelength lasers are used as light sources to increase the number of channels, which virtually increases the cost and complexity of the system. Therefore, multi-wavelength fiber lasers that can provide light sources for multiple channels at the same time have become one of the hotspots in the research of multi-wavelength Erbium-doped fiber lasers in recent years. Multi-wavelength fiber lasers have the advantages of stable performance, simple structure, tunable wavelength number and range, an...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a stable and tunable multi-wavelength highly doped erbium-doped fiber laser to solve the problem of multi-wavelength output lasers at room temperature in the prior art, with low stability and flatness, too long gain fibers and complex processes, etc. question

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