Precise tunable multiple wavelength annular optical fiber laser

Abstract

The present invention discloses a precise tunable multi-wavelength ring optical fiber laser structure. A ring laser cavity includes Er-doped fiber that is taken as gain medium; a 980nm/1550nm wavelength-division multiplexer is used to couple pumping laser of 980nm into the Er-doped fiber; a polarization relevant isolator with tail optical fiber on two ends guaranties the laser work in one way, meanwhile plays the role of a polarizer; two polarization controllers respectively on two side of the polarization relevant isolator are used to control polarization state, a 10dB coupler with 10% of the terminal port used to output optical signal and 90% of the optical signal stays in the cavity for cycle. A segment of long single mode fiber is inserted in the laser cavity and used to increase nonlinear effect inside the laser cavity; a piece of polarization maintaining optical fiber and a polarization relevant isolator constitute a birefraction optical fiber periodicity filter; the on-line birefraction optical fiber filter simplifies structure of the optical fiber laser, makes the optical fiber laser be more easily integrated, and allow the multi- wavelength optical fiber laser with precise tenability.

Description

[0001] technology neighborhood [0002] The invention relates to the fields of optical communication and fiber lasers, and in particular provides a precision tunable multi-wavelength ring fiber laser. Background technique [0003] Multi-wavelength fiber laser is a kind of low-cost and high-efficiency laser light source. It has great application potential in aspects such as wavelength division multiplexing optical communication systems, optical fiber sensing, performance testing of optical devices and dispersion testing of materials. In addition to the mode-locked fiber laser, there is another fiber laser that has attracted great attention. Soaking erbium-doped fiber in liquid nitrogen (77K) to suppress its uniform broadening mechanism can realize multi-wavelength erbium-doped fiber laser, but this method has great limitations and cannot work at room temperature. A variety of methods have been proposed so far to enable fiber lasers to generate stable multi-wavelength at room t...

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Problems solved by technology

Soaking erbium-doped fiber in liquid nitrogen (77K) to suppress its uniform broadening mechanism can realize mult

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